Chemistry Practice Tests 5

Created by Ali Durrani

NET Practice

Chemistry Practice Test 5

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1 / 100

Category: Chemistry Ch 2 Class 12

Which one of the following alkaline earth metal carbonates is thermally the most stable?

NUMS 2020
Chemistry
s and p Block Elements
Elimination Tool:

A) BaCO3

B) MgCO3

C) CaCO3

D) SrCO3

2 / 100

Category: Chemistry Ch 16 Class 12

Which of the following gases has least concentration in air a

02

H2

He

CO2

3 / 100

Category: Chemistry

Q.32 vapor pressure is measured by calculating difference in liquid pressure and

A mercury pressure

B. glass pressure

C. atmospheric pressure

D. container pressure

4 / 100

Category: Chemistry Ch 8 Class 12

1,4-dimethyl benzene is called as ______.

PreMedPK MDCAT Mock 5
Chemistry
Hydrocarbons
Elimination Tool:

A) Ortho-xylene

B) Para-xylene

C) Para-methyl toluene

D) Meta-methyl toluene

5 / 100

Category: Chemistry Ch 8 Class 11

A solution having pH = 0 is

Strongly basic

Weakly basic

Neutral

Strongly acidic

6 / 100

Category: Chemistry

Q.155 In proteins the H bonding is present between

A.C-H

B. N-H

C.0-H

D. Cl-H

7 / 100

Category: Chemistry Ch 1 Class 12

Who started the development of the First Periodic Table?

) Antoine Bequerel

Dimitri Mendeleev

Robert Boyle

John Newlands

8 / 100

Category: Chemistry Ch 6 Class 11

The Lattice energy is also called as:

PMC 2020
Chemistry
Chemical Bonding
Elimination Tool:

A) Energy of affinity

B) Bond energy

C) Crystal energy

D) Potential energy

9 / 100

Category: Chemistry Ch 4 Class 11

The shape of crystal in which it usually grows is called its _____.

PMC Practice 6
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) Size

B) Capacity

C) Habit

D) Property

10 / 100

Category: Chemistry Ch 16 Class 12

The formula of “rock salt” is:

NTS 2012
Chemistry
Environmental Chemistry
Elimination Tool:

A) NaOH

B) NaHCO3

C) Na2CO3

E) NaCl

11 / 100

Category: Chemistry Ch 9 Class 12

Which one of the following is the correct structure of 2,2-Dimethylbutane?

PMC Sample 1
Chemistry
Hydrocarbons
Elimination Tool:

A) CH₃(CH₃)₂CCH₂CH₃

B) CH₃(CH₃)CCHCH₃

C) CH₃(CH₃)CCH₂CH₃

D) CH₃CH₂CH₂CH₃

12 / 100

Category: Chemistry Ch 10 Class 11

Oxidation number of particular element can be directly or indirectly inferred from its:

UHS 2019
Chemistry
Electrochemistry
Elimination Tool:

A) Group number

B) Atomic size

C) Atomic mass

D) Physical state

13 / 100

Category: Chemistry Ch 9 Class 12

Boiling point of benzene is:

70.3

80.1

133

79.41

14 / 100

Category: Chemistry Ch 7 Class 12

CH3CH2CH2COCH3 is the functional isomer of:

NTS 2016 DUHS & JSMU
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

A) CH3CH2CH2CH2CHO

B) CH3CH2CH2CH2OH

C) CH3CH2COCH2CH3

D) CH3 – (CH)2 COCH2CH3

15 / 100

Category: Chemistry Ch 5 Class 11

The electronic configuration of iron is:

NTS 2011
Chemistry
Atomic Structure
Elimination Tool:

A) 1s2 , 2s2 , 2p6 , 3s2 , 3p6 , 3d5 , 4s2

B) 1s2, 2s2 , 2p6 , 3s2 , 3p6 , 3d5, 4s1

C) 1s2 , 2s2, 2p6 , 3s2 , 3p6 , 3d6 , 4s2

D) 1s2 , 2s2 , 2p6 , 3s2 , 3p6 , 3d3 , 4s2

16 / 100

Category: Chemistry

The common features, among the species CN, CO and NO are:

NUMS Mock 3
Chemistry
Chemical Bonding

A) Bond order three and Isoelectronic

B) Bond order three and weak field ligands

C) Bond order two andπacceptors

D) Isoelectronic and weak field ligands

17 / 100

Category: Chemistry Ch 2 Class 12

Red lead is:

NUMS 2014
Chemistry
s and p Block Elements
Elimination Tool:

A) PbO

B) Pb3O4

C) Pb2O4

D) Pb2O5

18 / 100

Category: Chemistry Ch 6 Class 11

The number of sigma and pi bonds in 1-butene-3-yne?

NUMS 2015
Chemistry
Chemical Bonding
Elimination Tool:

A) 5 sigma and 5 pi

B) 7 sigma and 3 pi

C) 8 sigma and 2 pi

D) 6 sigma and 4 pi

19 / 100

Category: Chemistry Ch 3 Class 11

The expression PV = nRT represents the:

NUMS 2020
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) Dalton’s Law

B) Avogadro’s Law

C) General gas equation

D) Van der Waals equation

20 / 100

Category: Chemistry

Q.110 Which of the following compound is an amide?

A. NH4CNO

B. NH2COCH2

C. NH2CONH2

D. NH2COONH2

21 / 100

Category: Chemistry Ch 6 Class 12

Which of the following has the lowest boiling point?

Titanium

Chromium

Manganese

Vanadium

22 / 100

Category: Chemistry Ch 6 Class 11

Which pair has species with different shapes?

NTS 2016 SMBBMC
Chemistry
Chemical Bonding
Elimination Tool:

A) BeCl2 and CO2

B) NH3 and BF3

C) SCl2 and H2O

D) CH4 and NH4+

23 / 100

Category: Chemistry Ch 9 Class 12

Alkenes are:

PMC Sample 3
Chemistry
Hydrocarbons
Elimination Tool:

A) Electrophiles

B) Nucleophiles

C) Both Options are correct

D) None of these options is correct

24 / 100

Category: Chemistry Ch 11 Class 12

Primary Alcohol is produced by reactions of Grignard’s reagent with _________ followed by hydrolysis in an acidic medium.

PreMedPK MDCAT Mock 1
Chemistry
Alcohols, Phenols and Ethers
Elimination Tool:

A) Carbon dioxide

B) Formaldehyde

C) Acetaldehyde

D) Ketone

25 / 100

Category: Chemistry Ch 2 Class 11

While calculating vapor pressure of a liquid in manometer, the column of mercury facing the vapors of a liquid is _____ due to pressure on surface of liquid in flask.

PMC Practice 1
Chemistry
Experimental Techniques in Chemistry
Elimination Tool:

A) Compressed

B) Depressed

C) Rises

D) Lowers

26 / 100

Category: Chemistry Ch 7 Class 11

Two rocket fuels below are determined by their high performance.

N2H4(l) + O2(g) -> N2(g) + 2H2O(l) ΔH= -632 kJ

H2 (g) + ½ O2(g) -> H2O(l) ΔH = -286 kJ

If equal masses of hydrazine and hydrogen are used, which of the following has better performance?

NUMS 2019 Cancelled
Chemistry
Thermochemistry
Elimination Tool:

A) Hydrazine

B) Both have equal enthalpy of formation

C) Hydrogen gas

D) Cannot be compared

27 / 100

Category: Chemistry Ch 13 Class 12

Which of the following carboxylic acids will be the most acidic?

NUMS 2016
Chemistry
Carboxylic Acids and its Derivatives
Elimination Tool:

A) CH3CHClCH2COOH

B) CH3CH2CCl2COOH

C) CH3CH2CHClCOOH

D) CH3CH2CH2COOH

28 / 100

Category: Chemistry Ch 8 Class 11

Le-Chatelier Principle is about

PMC Sample 3
Chemistry
Chemical Equilibrium
Elimination Tool:

A) Reaction Mixture

B) Reactants

C) Equilibrium Mixture

D) Products

29 / 100

Category: Chemistry Ch 11 Class 11

A certain chemical reaction follows the
following rate law:

Rate =K [A] [B]2 The order of reaction is:

NTS 2011
Chemistry
Reaction Kinetics
Elimination Tool:

A) 1

B) 2

C) 3

D) 4

30 / 100

Category: Chemistry

CH3CN + NCI > A + B in presence of water in the above reaction A and B are

Acetic acid and methyl chloride

Acetic acid and ammonia

Acetic acid and ammonium chloride

Acetic acid and acid amide

31 / 100

Category: Chemistry Ch 6 Class 11

GN lewis described which one of the following bonds?

NTS 2015 SMBBMC
Chemistry
Chemical Bonding
Elimination Tool:

A) Ionic bond

B) covalent bond

C) coordinate covalent bond

D) all of the above

32 / 100

Category: Chemistry

Q.75 Metallic character depends on.

A. Electron affinity

B. Ionization energy

C. Electronegativity

D. All of these

33 / 100

Category: Chemistry Ch 1 Class 11

Glucose(C6H12O6) is the most important nutrient in a cell for generating chemical potential energy, what is the mass percent of carbon in 1.5g of sample?

PMC Practice 24
Chemistry
Introduction to Fundamental Concepts of Chemistry
Elimination Tool:

A) 33%

B) 40%

C) 53.3%

D) 6.67%

34 / 100

Category: Chemistry Ch 8 Class 12

H2 and Cl2 do not react in the dark, but in the presence of light a vigorous reaction is initiated due to the formation of:

NUMS 2016
Chemistry
Hydrocarbons
Elimination Tool:

A) Hydrogen free radical

B) Chlorine free radical

C) Hydrogen chloride molecule

D) Both hydrogen and chlorine free radicals

35 / 100

Category: Chemistry Ch 7 Class 12

The isomers due to the unequal distribution of carbon atoms on either side of the functional group belonging to the same homologous series are called:

NUMS 2014
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

A) Functional isomers

B) Position isomers

C) Chain isomers

D) Metamers

36 / 100

Category: Chemistry Ch 9 Class 11

The vapour pressure of water at room temperature is 23.8 mm Hg. The vapour pressure of an aqueous solution of sucrose with mole fraction 0.2 is equal to:

NUMS 2015
Chemistry
Stoichiometry
Solution and Colloids
Elimination Tool:

A) 19.04 mm Hg

B) 24.2 mm of Hg

C) 21.42 mm of Hg

D) 21.4 mm of Hg

37 / 100

Category: Chemistry

Q.128 Which of the following element is not usually present in all proteins?

A. Carbon

B. Hydrogen

C. Nitrogen

D. Sulphur

38 / 100

Category: Chemistry Ch 6 Class 11

Structure of ammonia is:

Linear

AB4 (bent or angular)

AB3 (Trigonal)

AB4 (Trigonal pyramidal)

39 / 100

Category: Chemistry Ch 4 Class 12

Which is the correct electronic configuration of Chromium (24Cr)?

UHS 2018
Chemistry
d and f Block Elements
Elimination Tool:

A) 1s2, 2s2, 3s2, 2p6, 3p6, 4s2, 3d6

B) 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d4

C) 1s1, 2s2, 2p6, 3s2, 3p6, 3d6

D) 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5

40 / 100

Category: Chemistry

Q.120 Cyanohydrin are formed from carbonyl compounds by __________ reactions mechanism

A. Free radical

B. Nucleophilic substitution

C. Nucleophilic addition

D. Electrophilic addition

41 / 100

Category: Chemistry Ch 12 Class 12

IUPAC name of propionaldehyde is:

Methanal

Acetaldehyde

Propanal

Butanal

42 / 100

Category: Chemistry Ch 1 Class 11

The atoms of hemoglobin is heavier than H-atoms

PMC Practice 23
Chemistry
Introduction to Fundamental Concepts of Chemistry
Elimination Tool:

A) 67,000 times

B) 68,000 times

C) 65,000 times

D) 69,000 times

43 / 100

Category: Chemistry Ch 12 Class 12

Which of the following Compound is not reduced by NaBH4 ?

PreMedPK MDCAT Mock 1
Chemistry
Aldehydes and Ketones
Elimination Tool:

A) Acetaldehyde

B) Acetone

C) Carboxylic acid

D) Alkene

44 / 100

Category: Chemistry

Which of the following does not show variable valency?

NUMS Mock 3
Chemistry
Atomic Structure

A) Mn

B) Fe

C) Zn

D) Cr

45 / 100

Category: Chemistry Ch 15 Class 12

What is used in cement manufacture?

Limestone

Starch

Potassium Oxide

Both a and b

46 / 100

Category: Chemistry Ch 1 Class 11

Natural gas in homes burns in excess of oxygen, what is the limiting reactant in this case?

PMC 2021 Tested
Chemistry
Introduction to Fundamental Concepts of Chemistry
Elimination Tool:

A) Oxygen

B) Natural gas

C) Air

D) There is no limiting reactant

47 / 100

Category: Chemistry

Q.104 Which of the following does not show chain isomers

A. Butane

B. Propane

C. Pentane

D. Hexane

48 / 100

Category: Chemistry

Salts of weak bases react with strong acids to give a/an

NUMS Mock 1
Chemistry
Acids, Bases and Salts

A) Basic solution

B) Acidic solution

C) Neutral solution

D) None

49 / 100

Category: Chemistry

For a sub shell I = 2 and m = -2, -1, 0 , +1, +2, it implies that it has ____ space orientation.

NUMS Mock 4
Chemistry
Atomic Structure

A) One

B) Two

C) Three

D) Five

50 / 100

Category: Chemistry Ch 9 Class 11

0.5 molar solution NaOH contains:

NUMS 2020
Chemistry
Solution and Colloids
Elimination Tool:

A) 40g NaOH in one dm3

B) 80g NaOH in one dm3

C) 10g NaOH in one dm3

D) 20g NaOH in one dm3

51 / 100

Category: Chemistry

Water has maximum density at:

NUMS Mock 2
Chemistry
States of Matter – Gases, Liquids and Solids

A) -4 C

B) – 1 C

C) 0 C

D) 4 C

52 / 100

Category: Chemistry Ch 4 Class 11

Vapor pressure of a liquid depends upon

) Nature of liquid

Temperature

Both a and b

Atomic Pressure

53 / 100

Category: Chemistry

Q.18 The increase in size of an anion is due to increase n repulsion of

A. electron-proton

B. electron-electron

C. electron-nucleus

D. proton-nucleus

54 / 100

Category: Chemistry Ch 11 Class 12

Which of the following is not a physical property of ethers?

PreMedPK MDCAT Mock 3
Chemistry
Alcohols, Phenols and Ethers
Elimination Tool:

A) They are usually volatile liquids

B) Show weak hydrogen bonding

C) They are highly flammable with low boiling points

D) It is poisonous and is used as a disinfectant in hospitals

55 / 100

Category: Chemistry Ch 9 Class 12

How many chain isomers of Pentane is possible?

PMC Practice 1
Chemistry
Hydrocarbons
Elimination Tool:

A) Two

B) Four

C) Three

D) Five

56 / 100

Category: Chemistry

The indicator is a colored compound?

Organic

Inorganic

Acidic

Basic

57 / 100

Category: Chemistry Ch 1 Class 12

Metals usually produce hydrogen gas with acids. Which of the following produces hydrogen gas with NaOH?

Zn

Cu

Al

Ni

58 / 100

Category: Chemistry Ch 7 Class 11

Some substances lack definite heats of fusion. These substances are:

NUMS 2020
Chemistry
Thermochemistry
Elimination Tool:

A) Isomorphs

B) Polymorphs

C) Amorphous solids

D) Crystalline solids

59 / 100

Category: Chemistry

Nitric oxide has how many valence electrons?

NUMS Mock 1
Chemistry
Atomic Structure

A) 10

B) 13

C) 11

D) 12

60 / 100

Category: Chemistry

Which of the following shows the Planck’s quantum theory?

NUMS Mock 3
Chemistry
Atomic Structure

A) E = hcv

B) E = c/v

C) E = cv

D) None of these options are correct

61 / 100

Category: Chemistry

AgCI is in water.

Partially soluble b)

Completely soluble

Not soluble

None of these

62 / 100

Category: Chemistry Ch 2 Class 12

________ are prepared by passing hydrogen gas over hot alkali metals or alkaline earth metals?

NTS 2015 SMBBMC
Chemistry
s and p Block Elements
Elimination Tool:

A) Covalent hydrides

B) Ionic hydrides

C) Borderline hydrides

D) Metallic hydrides

63 / 100

Category: Chemistry

Q.99 The ionic compound with the highest lattice energy is

A. NaF

B. NaCl

C. NaBr

D. NaI

64 / 100

Category: Chemistry Ch 11 Class 11

The process of bringing an element in use after its complete half-life is:

Rejuvenation

Revoking

Recycling

None of these

65 / 100

Category: Chemistry Ch 7 Class 12

Propyl Acetate and valeric acid are which type of isomers

NUMS 2018
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

A) Tautomers

B) Functional

C) Position

D) Metamers

66 / 100

Category: Chemistry

Q.3 The equilibrium Constant is always written as a ratio of

A. Reactants over products

B. Products over reactants

C. Product times Reactants

D. None of these

67 / 100

Category: Chemistry Ch 9 Class 12

The unhybridized p orbitals of benzene are present in the form of _________.

PMC Practice 2
Chemistry
Hydrocarbons
Elimination Tool:

A) Between the C-C bonds of benzene

B) Above and below the carbon bonds

C) In the form of a cloud above and below the benzene ring

D) None of these options is correct

68 / 100

Category: Chemistry Ch 4 Class 11

Vapor pressure is measured by calculating the difference in liquid pressure and?

PMC Practice 2
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) Mercury pressure

B) Glass pressure

C) Atmospheric pressure

D) Container pressure

69 / 100

Category: Chemistry Ch 14 Class 12

Polyester is used in:

PMC 2021 Tested
Chemistry
Macromolecules
Elimination Tool:

A) Cosmetic industry

B) Fabric industry

C) None of these

D) Food industry

70 / 100

Category: Chemistry Ch 4 Class 11

How many atmospheres correspond to 1050 torr?

NTS 2019
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) 1.050

B) 10.38

C) 1.380

D) 2.760

71 / 100

Category: Chemistry Ch 11 Class 12

Which of the following alcohol does not get oxidized when it reacts with K₂Cr₂O₇/H₂SO₄?

PreMedPK MDCAT Mock 1
Chemistry
Alcohols, Phenols and Ethers
Elimination Tool:

A) CH₃C(CH₃)₂OH

B) CH₃CH(CH₃)OH

C) CH₃OH

D) C₂H₅OH

72 / 100

Category: Chemistry Ch 5 Class 11

A 4s orbital has:

NUMS 2014
Chemistry
Atomic Structure
Elimination Tool:

A) One node

B) Two nodes

C) three nodes

D) O nodes

73 / 100

Category: Chemistry Ch 13 Class 12

High molecular mass organic compounds, upon hydrolysis yield amino acids are called _______.

PMC Sample 3
Chemistry
Carboxylic Acids and its Derivatives
Elimination Tool:

A) Carbohydrates

B) Lipids

C) Proteins

D) DNA

74 / 100

Category: Chemistry Ch 4 Class 11

Which one Is not possible a)

Ionic crystal

Covalent crystal

Metallic crystal

Atomic-crystal

75 / 100

Category: Chemistry Ch 10 Class 11

CH3Cl + Cl2 —-> CH2Cl2 + HCl is an example of ?

NTS 2015 SMBBMC
Chemistry
Electrochemistry
Elimination Tool:

A) Oxidation reduction

B) Addition reaction

C) Substitution reaction

D) Autoxidation reaction

76 / 100

Category: Chemistry

Which one of the following molecules has sp3 hybridization?

NUMS Mock 2
Chemistry
Chemical Bonding

A) CH4

B) C2H4

C) CO2

D) C2H2

77 / 100

Category: Chemistry Ch 10 Class 12

Histidine acts as _____ in nature?

NUMS 2019 Cancelled
Chemistry
Alkyl Halides and Amines
Elimination Tool:

A) Acidic

B) Neutral

C) Basic

D) Acidic and Basic

78 / 100

Category: Chemistry Ch 3 Class 11

Choose the correct statement:

NUMS 2014
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) Diamond is the hardest and graphite is softest

B) Graphite is the hardest while lamp black is softest

C) Coal is the hardest and coke is softest

D) Diamond is the hardest and coke is softest

79 / 100

Category: Chemistry Ch 11 Class 12

The strength of an acid depends on?

PreMedPK MDCAT Mock 5
Chemistry
Alcohols, Phenols and Ethers
Elimination Tool:

A) Ease of removal of proton.

B) Stability of the anion formed.

C) Stability of the cation formed.

D) Depends on both ease of removal of proton and stability of the anion formed.

80 / 100

Category: Chemistry Ch 8 Class 12

Unsaturated Compound containing double bond is:

Alkane

Alkene

Alkyne

Alkylene

81 / 100

Category: Chemistry Ch 7 Class 11

One Calorie is equivalent to:

NTS 2019
Chemistry
Thermochemistry
Elimination Tool:

A) 0.4184J

B) 41.84 J

C) 4.184 J

D) 418.4 J

82 / 100

Category: Chemistry

Q.88 Most electronegative element among alkali metals

A. Li

B. Na

C. K

D. Rb

83 / 100

Category: Chemistry Ch 14 Class 12

Polymers are made up of:

PMC 2021 Tested
Chemistry
Macromolecules
Elimination Tool:

A) Monomers

B) Epimers

C) Enantiomers

D) Isomers

84 / 100

Category: Chemistry Ch 10 Class 11

Stronger the oxidizing agent, higher is the:

NUMS 2019 Reconduct
Chemistry
Electrochemistry
Elimination Tool:

A) Emf of cell

B) Oxidation potential

C) Reduction potential

D) Redox potential

85 / 100

Category: Chemistry Ch 4 Class 11

All the collisions between the particles of gases are elastic in nature. What is meant by “Elastic Collisions”?

UHS 2019
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) No change in the total kinetic energy

B) The velocity of the molecules changes

C) No change in potential energy during the collisions

D) No change in mass during the collisions

86 / 100

Category: Chemistry Ch 10 Class 12

RMgX is an organometallic compound, generally known as:

NTS 2012
Chemistry
Alkyl Halides and Amines
Elimination Tool:

A) Grignard's Reagent

B) Baeyer's Reagent

C) Ether

D) Ester

87 / 100

Category: Chemistry Ch 9 Class 12

The bond angles in benzene ring are:

PMC Sample 1
Chemistry
Hydrocarbons
Elimination Tool:

A) 90˚

B) 60˚

C) 120˚

D) 180˚

88 / 100

Category: Chemistry Ch 2 Class 12

Pierrie Curie and Marie Curie isolated which radioactive element?

NTS 2015 SMBBMC
Biology
s and p Block Elements
Elimination Tool:

A) Lithium

B) Radium

C) Boron

D) Uranium

89 / 100

Category: Chemistry

Q86 : Which of the following is most ionic in nature

A. Sodium chloride

B. Sodium fluoride

C. Sodium bromide

D. Sodium iodide

90 / 100

Category: Chemistry Ch 9 Class 11

Which statement is correct?

PMC Sample 3
Chemistry
Solution and Colloids
Elimination Tool:

A) Amorphous solids have sharp melting Points

B) Amorphous solids have zero percent arranged

C) Amorphous Solids have a range of melting points

D) Amorphous solids have definite heat of fusion

91 / 100

Category: Chemistry

Q.127 Limiting reactant controls the amount of,

A. Reactant

B. Product

C. Both A &B

D. None of these

92 / 100

Category: Chemistry Ch 1 Class 11

Avogadro’s constant is the number of:

PMC 2021 Tested
Chemistry
Introduction to Fundamental Concepts of Chemistry
Elimination Tool:

A) Electrons present in 2g of H

B) Atoms in 24g of Mg

C) Atoms in 1g of He

D) Molecules in 35.5g of Chlorine

93 / 100

Category: Chemistry Ch 11 Class 11

The colour of methyl orange in base is?

NTS 2015 SMBBMC
Chemistry
Acids, Bases and Salts
Elimination Tool:

A) Red

B) yellow

C) orange

D) pink

94 / 100

Category: Chemistry

Q.25 In a pressure cooker, boiling point of water is_

A. Raised than the normal

B. Lower than the normal

C. Lower than the freezing point

D. All of these

95 / 100

Category: Chemistry Ch 1 Class 12

Magnesium oxide is used in the making of the lining of blast furnaces. It is extracted from seawater as follows. Aqueous calcium hydroxide is added to seawater.

Ca(OH)2 (aq) + MgCl2 (aq) + Mg(OH)2 (s) + CaCl2 (aq)

The magnesium hydroxide is then filtered off and roasted.

Which of the following comparisons between calcium and magnesium explains why magnesium hydroxide forms?

NTS 2013
Chemistry
Periodicity in Elements
Elimination Tool:

A) Magnesium is less electropositive than calcium.

B) Magnesium is lower than calcium in the reactivity series

C) The enthalpy change of hydration for Mg2+is less exothermic than for Ca2+

D) The solubility product for Mg(OH)2is lower than that for Ca(OH)2

96 / 100

Category: Chemistry

Which one of the following is used as an anesthetic?

Acetone

Halothane

Methyl alcohol

Ethyl alcohol

97 / 100

Category: Chemistry Ch 5 Class 11

d subshell has

3 orbitals

5 orbitals

7 orbitals

12 orbitals

98 / 100

Category: Chemistry Ch 5 Class 11

The spectrum of He is expected to be similar to that of:

NUMS 2014
Chemistry
Atomic Structure
Elimination Tool:

A) Hydrogen

B) Sodium

C) Oxygen

D) Li+

99 / 100

Category: Chemistry Ch 8 Class 11

1.8 x 10 -5 is the dissociation constant of:

NTS 2016 SMBBMC
Chemistry
Chemical Equilibrium
Elimination Tool:

A) Formic acid

B) Acetic acid

C) Chloroacetic acid

D) Hydrocyanic acid

100 / 100

Category: Chemistry

Q.115 Alcohols can be oxidized to aldehyde and ketone by warming with acidified potassium dichromate. Which among of the following alcohols resists to this change

A. (CH3)2 CH CH2OH

B. CH3 CH2 CH(CH3) OH

C. (CH3)3 COH

D. C6H3 CH2 OH

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