Chemistry Practice Tests 3

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Chemistry Practice Test 3

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1 / 100

Category: Chemistry Ch 1 Class 12

In Contact Process arsenic impurities act as poison for:

NUMS 2019 Reconduct
Chemistry
Periodicity in Elements
Elimination Tool:

A) Fe(OH)3

B) V2O5

C) Fe2O3

D) H2S2O7

2 / 100

Category: Chemistry Ch 11 Class 12

How are carboxylic acids formed from alcohol?

PMC Practice 1
Chemistry
Alcohols, Phenols and Ethers
Elimination Tool:

A) Hydrolysis

B) Reduction

C) Oxidation

D) Protonation

3 / 100

Category: Chemistry Ch 8 Class 12

How many sigma groups are there in benzene?

NTS 2014
Chemistry
Hydrocarbons
Elimination Tool:

A) 3

B) 6

C) 9

D) 12

4 / 100

Category: Chemistry Ch 10 Class 11

The common oxidation number of halogens is:

PMC 2020
Chemistry
Electrochemistry
Elimination Tool:

A) -1

B) +1

C) -2

D) 0

5 / 100

Category: Chemistry Ch 1 Class 12

Maximum ionization potential is of:

NUMS 2014
Chemistry
Periodicity in Elements
Elimination Tool:

A) Ca

B) Na

C) Be

D) Mg

6 / 100

Category: Chemistry

Q.97 Which of the following liquid has boiling point greater than that of water at standard pressure

A. Acetic acid

B. Acetone

C. Ethanol

D. Benzene

7 / 100

Category: Chemistry Ch 11 Class 12

Which is more soluble in ethanol?

chlorine

Calcium carbonate

Potassium chloride

Propane

8 / 100

Category: Chemistry Ch 16 Class 12

Ozone Is

02

03

04

ps

9 / 100

Category: Chemistry Ch 4 Class 12

The transition elements belongs to Group VI B are

PMC Practice 6
Chemistry
d and f Block Elements
Elimination Tool:

A) Zn, Cd, Hg

B) Fe, Ru, Os

C) Mn, Te, Re

D) Cr, Mo, W

10 / 100

Category: Chemistry Ch 14 Class 12

Which one of the following is the pure carbon compound and used as a reducing agent in industries?

NTS 2018
Chemistry
Macromolecules
Elimination Tool:

A) Coal tar

B) Petroleum

C) Coal gas

D) Coke

11 / 100

Category: Chemistry Ch 6 Class 12

What is NOT true about K2Cr2O7?

Blue crystalline solid

Not soluble in water

Strong oxidizing agent

Used in formation of lead chromate

12 / 100

Category: Chemistry Ch 4 Class 11

Which of the following is not a property of liquid?

Random movement of molecule

Molecules have the same position with respect to one another

Takes shape of the container

Are less common than solids and gases

13 / 100

Category: Chemistry Ch 7 Class 12

Formyl group is present in

PMC Sample 1
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

A) Aldehydes

B) ethers

C) thiol

D) acetone

14 / 100

Category: Chemistry Ch 1 Class 11

Which of the following has six isotopes?

PMC Practice 4
Chemistry
Introduction to Fundamental Concepts of Chemistry
Elimination Tool:

A) Manganese

B) Tin

C) Calcium

D) Carbon

15 / 100

Category: Chemistry Ch 9 Class 11

For a chemical reaction to occur, particles that collide should:

PMC 2021 Tested
Chemistry
Solution and Colloids
Elimination Tool:

A) Have proper orientations

B) Have proper energies

C) All of these

D) Be in a homogenous mixture

16 / 100

Category: Chemistry Ch 1 Class 11

Chemical properties of an atom depends upon number of

Electron

Neutrons

Protons

Nucleons

17 / 100

Category: Chemistry Ch 1 Class 11

What is the mass of 10^-3 moles of MgSO4?

120 gram

12 grams

1.2 grams

0.12 gram

18 / 100

Category: Chemistry

If any amino acids contain greater number of NH2, it is:

NUMS Mock 3
Chemistry
Alkyl Halides and Amines

A) Acidic

B) Neutral

C) Amphoteric

D) Basic

19 / 100

Category: Chemistry

Q.120 Which of the following has six isotopes

A. Palladium

B Tin

C. Cadmium

D. Carbon

20 / 100

Category: Chemistry

In this reaction NH4* + H2O -> H3O*, the conjugate base of H3O+ ion is:

NUMS Mock 3
Chemistry
Chemical Equilibrium

A) NH4+

B) H2O

C) H*

D) NH3

21 / 100

Category: Chemistry Ch 4 Class 12

In rhombic sulphur there are atoms in each molecule?

7

8

6

9

22 / 100

Category: Chemistry Ch 4 Class 11

When animals inhale air, oxygen will move into the lungs due to difference in partial pressure of oxygen in lungs and atmosphere. This obeys

PMC Sample 1
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) Pascal's law

B) Dalton's law

C) Charles's law

D) Bohr's law

23 / 100

Category: Chemistry Ch 13 Class 12

There is double bond in oleic acid between carbon numbers:

7-8

8-9

10-11

9-10

24 / 100

Category: Chemistry

Ketones can be made by oxidation of:

NUMS Mock 2
Chemistry
Aldehydes and Ketones

A) Aldehydes

B) Primary Alcohols

C) Secondary Alcohols

D) Tertiary Alcohols

25 / 100

Category: Chemistry Ch 10 Class 11

Stronger the oxidizing agent, greater is the:

NUMS 2020
Chemistry
Electrochemistry
Elimination Tool:

A) Oxidation potential

B) Reduction potential

C) Redox potential

D) EMF of cell

26 / 100

Category: Chemistry Ch 12 Class 12

What is the color of the precipitate when Brady’s reagent is used to test a benzaldehyde?

NUMS 2019 Cancelled
Chemistry
Aldehydes and Ketones
Elimination Tool:

A) Green

B) Brown

C) Magenta

D) Red

27 / 100

Category: Chemistry Ch 11 Class 11

Which of the following statements best describes how a catalyst works

NUMS 2018
Chemistry
Reaction Kinetics
Elimination Tool:

A) A catalyst changes the potential energies of the reactants and products

B) A catalyst decreases the temperature of the reaction which leads to a faster rate

C) A catalyst lowers the activation energy barrier for the reaction by providing a different reaction mechanism.

D) A catalyst raises the activation energy for the reaction which produces a faster rate

28 / 100

Category: Chemistry Ch 10 Class 12

Alkyl Halides that go through SN1 reactions are

Primary

Secondary

Tertiary

All of these

29 / 100

Category: Chemistry Ch 4 Class 11

If the absolute temperature of a gas is reduced to one half and the pressure is doubled, the volume of gas will be:

NUMS 2018
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) Increased four times

B) Decreased four times

C) Remained unchanged

D) Reduced to one half

30 / 100

Category: Chemistry Ch 10 Class 11

Each half reaction in ion electron method is balanced by adding:

PMC Sample 1
Chemistry
Electrochemistry
Elimination Tool:

A) Electrons on left hand side

B) Electrons on right hand side

C) Both left or right hand side

D) None of these options are correct

31 / 100

Category: Chemistry Ch 3 Class 12

Prussian blue is:

NUMS 2014
Chemistry
d and f Block Elements
Elimination Tool:

A) K2Fe[FeCN6]

B) K4[FeCN6]

C) Fe4[Fe(CN)6] 3xH2O

D) K3FeCN6

32 / 100

Category: Chemistry Ch 16 Class 12

Chloro-fluoro carbons cause

Radiations pollution

Water pollution

Air pollution

Soil pollution

33 / 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

34 / 100

Category: Chemistry Ch 3 Class 12

Which element among the following forms a protective oxide coating on exposure to air?

Nitrogen

Aluminium

Boron

35 / 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

36 / 100

Category: Chemistry Ch 9 Class 11

The formula of Plaster of Paris is:

NTS 2017
Chemistry
Solution and Colloids
Elimination Tool:

A) (CaSO4).1/2H2O

B) (CaSO4).5H2O

C) (CaSO4).7H2O

D) (CaSO4).9H2O

37 / 100

Category: Chemistry Ch 2 Class 12

Which of the following oxides is most acidic oxide?

NUMS 2019 Reconduct
Chemistry
s and p Block Elements
Elimination Tool:

A) Al2O3

B) Cl2O3

C) Na2O3

D) CaO

38 / 100

Category: Chemistry Ch 11 Class 12

Phenol is derived from?

Benzene

Carboxylic acid

Alcohols

Aliphatic compounds

39 / 100

Category: Chemistry Ch 10 Class 11

Standard Electrode Potential is measured at temperature:

348K

298K

20K

235K

40 / 100

Category: Chemistry Ch 5 Class 11

The quantum numbers +½ and -½ for the electron spin represent:

NTS 2017
Chemistry
Atomic Structure
Elimination Tool:

A) Rotation of the electron in clockwise and anticlockwise direction respectively

B) Rotation of the electron in anticlockwise and clockwise direction respectively

C) Magnetic movement of the electron pointing up and down respectively

D) Two quantum mechanical spin states which have no classical analogue

41 / 100

Category: Chemistry Ch 7 Class 11

Burning of fuel is a

Endothermic

Exothermic

Both a & b

None of these

42 / 100

Category: Chemistry Ch 7 Class 12

(HCHO)nH20 is the chemical formula for?

NTS 2015 SMBBMC
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

A) Formic acid

B) Paraformaldehyde

C) á – methyl propionaldehyde

D) Propionic acid

43 / 100

Category: Chemistry Ch 3 Class 11

Which of the following substances has giant covalent structure?

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

A) Iodine crystal

B) Solid CO2

C) Silica

D) White phosphorus

44 / 100

Category: Chemistry

Which of the following is the percentage of the original quantity of a radioactive material left after five half-lives approximately.

NUMS Mock 4
Physics
Nuclear Physics

A) 3%

B) 6.25%

C) 10%

D) 20%

45 / 100

Category: Chemistry Ch 2 Class 11

Which of the following can ba employed instead of filter papers?

Gooch Crucible

Sintered Glass Crucible

Both a and b

None of these

46 / 100

Category: Chemistry Ch 10 Class 11

Current in electrolysis is carried through:

PMC Sample 3
Chemistry
Electrochemistry
Elimination Tool:

A) Free electrons

B) Positive Ions

C) Negative Ions

D) Both B and C

47 / 100

Category: Chemistry Ch 4 Class 12

H2SO4 is used in industries of?

Paint

Textile

Rubber

Aluminum

48 / 100

Category: Chemistry Ch 3 Class 11

An example of a solution not in equilibrium is:

NTS 2016 DUHS & JSMU
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) chemical pH indicator

B) acid/base buffer

C) anhydrous solution

D) hypotonic solution

49 / 100

Category: Chemistry Ch 7 Class 12

Example of nucleophile is:

NUMS 2017
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

A) BF3

B) SO3

C) AlCl3

D) CN

50 / 100

Category: Chemistry Ch 14 Class 12

Purification of bauxite whose major impurity Is silica (SiO2) is carried out through:

NTS 2010
Chemistry
Macromolecules
Elimination Tool:

A) Baeyer’s Method

B) Hall’s Method

C) Serpek’s Method

D) Contact Method

51 / 100

Category: Chemistry Ch 1 Class 12

Which of the following statements about H2S is false?

NTS 2017
Chemistry
Periodicity in Elements
Elimination Tool:

A) It is a covalent compound

B) It is a gas with bad smell

C) It is a stronger reducing agent than H2O

D) It is a weak base in water

52 / 100

Category: Chemistry

Q.111 Evaporation is a process?

A. Exothermic

B. Spontaneous

C. Non-Spontaneous

D. None of these

53 / 100

Category: Chemistry Ch 11 Class 11

As the concentration of reactant increases, the rate of reaction also increases, it is because:

NUMS 2018
Chemistry
Reaction Kinetics
Elimination Tool:

A) K.E. increases in molecules

B) Oscillation increases between molecules

C) Collisions frequency increases

D) Temperature of molecules increases

54 / 100

Category: Chemistry Ch 10 Class 11

Oxidation state of sulphur in H2SO4?

+2

+6

4

-2

55 / 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

56 / 100

Category: Chemistry

The decreasing order of second ionization energy of K, Ca, Ba is:

NUMS Mock 1
Chemistry
Chemical Bonding

A) K > Ca > Ba

B) Ca > Ba > K

C) Ba > K > Ca

D) K > Ba > Ca

57 / 100

Category: Chemistry Ch 14 Class 12

Polymer having a characteristics odour and mostly used as an adhesive material is

Polyvinyl chloride

Poly styrenec

Ploride

Polyvinyl acetate

58 / 100

Category: Chemistry

Q.113 From which of the following ketone can be prepared?

A. Propyne

B. Secondary alcohol

C. Ca Acetate

D. All of these

59 / 100

Category: Chemistry Ch 7 Class 11

Which ion will have a maximum value of the heat of hydration?

PMC Practice 1
Chemistry
Thermochemistry
Elimination Tool:

A) Al+3

B) Cs+

C) Ba+

D) Mg+2

60 / 100

Category: Chemistry Ch 9 Class 11

Lowering of vapor pressure Is directly proportional to: a)

Temperature

Mole fraction of Solute

Mole fraction of Solvent

Amount of solution

61 / 100

Category: Chemistry Ch 10 Class 11

In the reaction 2Fe+Cl2 2FeCl3

NTS 2017
Chemistry
Electrochemistry
Elimination Tool:

A) Fe is reduced

B) Fe is oxidized

C) Cl2 oxidized

D) None of the above

62 / 100

Category: Chemistry Ch 7 Class 12

Which functional group is not a double bond?

NUMS 2019 Cancelled
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

A) Ethers

B) Aldehydes

C) Ketones

D) Esters

63 / 100

Category: Chemistry Ch 6 Class 11

The hybridization of atomic orbitals of N2+, NO3-, and NH4+are, respectively:

NTS 2015 DUHS and JSMU
Chemistry
Chemical Bonding
Elimination Tool:

A) Sp, sp2, sp3

B) Sp, sp3, sp2

C) Sp2, sp, sp3

D) Sp2, sp3, sp

64 / 100

Category: Chemistry Ch 4 Class 12

The formula of Chile Peter salt is

NaCI

NaNO3

NaOH

NaNO4

65 / 100

Category: Chemistry Ch 11 Class 12

14) Ethanol and Methanol can be separated by:

Cannizzaro's reaction

Iodoform test

b) Lucas Test

Tolien's test

66 / 100

Category: Chemistry Ch 6 Class 11

The order of force of repulsion between lone pairs and Bond pairs is?

NTS 2015 SMBBMC
Chemistry
Chemical Bonding
Elimination Tool:

A) Lone pair Bond -pair repulsion > lone pair lone pair repulsion> Bond pair Bond pair repulsion

B) Bond pair -Bond pair repulsion> lone pair lone pair repulsion> lone pair Bond pair repulsion

C) lone pair lone pair repulsion> Bond pair Bond pair repulsion> lone pair Bond pair repulsion

D) lone pair lone pair repulsion> lone pair Bond pair repulsion> Bond pair Bond pair repulsion

67 / 100

Category: Chemistry Ch 9 Class 11

The properties of liquid crystals are intermediate b/w crystals and

PMC Sample 3
Chemistry
Solution and Colloids
Elimination Tool:

A) anisotropic liquids

B) nematic liquids

C) isotropic liquids

D) liquids

68 / 100

Category: Chemistry Ch 3 Class 12

silicon can be obtained from which one of the following compounds

Water

Sand

Potash

None

69 / 100

Category: Chemistry

Q.146 a liquid crystalline state exist between two temperatures I-e melting temperature and temperature

A. Boiling

B. Freezing

C. Clearing

D. All of these

70 / 100

Category: Chemistry Ch 8 Class 11

a

b

c

d

71 / 100

Category: Chemistry Ch 8 Class 11

A correct formula must:

NTS 2017
Chemistry
Chemical Equilibrium
Elimination Tool:

A) Be balanced with proper coefficients

B) Always have subscripts

C) Always conform to the valency rules

D) Always conforms to the law of multiple proportions

72 / 100

Category: Chemistry Ch 13 Class 12

Solubility of carboxylic acids in water decrease with

Decrease in molecular mass

Increase in molecular mass

Both a and b

None of these

73 / 100

Category: Chemistry Ch 8 Class 12

How many chain isomers are shown by C5H12?

PreMedPK MDCAT Mock 4
Chemistry
Hydrocarbons
Elimination Tool:

A) 5

B) 4

C) 3

D) 2

74 / 100

Category: Chemistry Ch 14 Class 12

What is the chemical reaction mechanism by which cells make polymers from monomers?

PMC 2021 Tested
Chemistry
Macromolecules
Elimination Tool:

A) Dehydration reaction

B) Formation of disulphide bridges

C) Ionic bonding of monomers

D) Hydrolysis

75 / 100

Category: Chemistry Ch 14 Class 12

_____ is a macromolecule found in blood.

PMC Practice 2
Chemistry
Macromolecules
Elimination Tool:

A) Hemoglobin

B) Plasma

C) Creatinine

D) Plasmids

76 / 100

Category: Chemistry Ch 12 Class 12

What type of chemical reaction is this?
CH3CHO + NH3 -> CH3CH(OH)NH2

NUMS 2019 Cancelled
Chemistry
Aldehydes and Ketones
Elimination Tool:

A) Addition – elimination

B) Electrophilic addition

C) Free radical addition

D) Nucleophilic addition

77 / 100

Category: Chemistry Ch 10 Class 12

Which of the following has the strongest bond?

NUMS 2019 Cancelled
Chemistry
Alkyl Halides and Amines
Elimination Tool:

A) CH3 – F

B) CH3 – I

C) CH3 – Cl

D) CH3 – Br

78 / 100

Category: Chemistry Ch 1 Class 11

The relative abundance of isotopes of elements are measured by?

PMC Practice 11
Chemistry
Introduction to Fundamental Concepts of Chemistry
Elimination Tool:

A) Atomic spectroscopy

B) Ionic spectroscopy

C) Mass spectroscopy

D) Mass spectrometry

79 / 100

Category: Chemistry Ch 5 Class 11

The number of electrons present in n=2 , l = 1 and m = 1, 0, -1 are:

NTS 2016 DUHS & JSMU
Chemistry
Atomic Structure
Elimination Tool:

A) 2

B) 6

C) 8

D) 10

80 / 100

Category: Chemistry Ch 8 Class 11

At equilibrium the concentration of reactants and product become:

NUMS 2020
Chemistry
Chemical Equilibrium
Elimination Tool:

A) Zero

B) Equal

C) Constant

D) Infinite

81 / 100

Category: Chemistry

Q.92 The correct statement about 2px and 2pz is

A. Both are shells of same atom

B. Both are degenerate orbitals

C. Both subshell have same energy

D. Both orbitals are parallel to each other

82 / 100

Category: Chemistry

Q.5 The smallest part of the crystal lattice has all the properties of the entire Crystals, this is called

A. unit

B. unit cell

C. unit crystal

D. all of these

83 / 100

Category: Chemistry Ch 4 Class 11

Which of the following is the correct equation to calculate relative molecular mass of a gas.

UHS 2018
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) M = mPR / VT

B) M = PV / mRT

C) M = mPRT / V

D) M = mRT / PV

84 / 100

Category: Chemistry Ch 11 Class 11

Rate determining step of a chemical reaction which occur in more than one step depends upon the

PMC Sample 1
Chemistry
Reaction Kinetics
Elimination Tool:

A) fastest step

B) Slowest Step

C) catalyst used

D) Temperature of reaction

85 / 100

Category: Chemistry Ch 7 Class 11

Which of the following condition is constant in Bomb calorimeter?

PMC Practice 1
Chemistry
Thermochemistry
Elimination Tool:

A) Pressure

B) Volume

C) Temperature

D) All of these

86 / 100

Category: Chemistry Ch 8 Class 12

When CH2 = CH2 reacts with a halogen acid, the product formed is:

Alkyl halide

Alkane

Alkyl

Allcene

87 / 100

Category: Chemistry Ch 1 Class 11

To find the number of molecules in a given compound which of the following is employed?

Chromatography

Le-Chatelier's principle

Kc

None of thes

88 / 100

Category: Chemistry Ch 15 Class 12

Which one of the following is NOT an advantage of synthetic fiber?

NTS 2016 SMBBMC
Chemistry
Environmental Chemistry
Elimination Tool:

B) Ease of ironing

C) Softness

D) Heat retention

E) Absorbs the sweat

89 / 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

90 / 100

Category: Chemistry Ch 11 Class 11

Sum of all the exponents of the molar concentration of the reactant present in the rate equation is known as:

NTS 2012
Chemistry
Reaction Kinetics
Elimination Tool:

A) Molecularity

B) Order of reaction

C) Rate of reaction

D) gradient

91 / 100

Category: Chemistry

Q.117 The rate of esterification of alcohols is more for

A. (CH3)3 COH

B. CH3 OH

C. C2 H5 OH

D. (CH3)2 CHOH

92 / 100

Category: Chemistry Ch 16 Class 12

Earth’s crust Is Included In which sphere?

Lithosphere

Hydrosphere

Atmosphere

Aerosphere

93 / 100

Category: Chemistry Ch 1 Class 12

Which of the following is not the use of bleaching powder?

NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:

A) Sterilization of drinking water

B) Oxidation of alcohols

C) Bleaching Linen

D) Preparation of Chlorine

94 / 100

Category: Chemistry

The major source of unburnt hydrocarbons in the atmosphere is / are:

NUMS Mock 1
Chemistry
Hydrocarbons

A) Petroleum

B) Natural gas

C) Automobiles

D) Human beings

95 / 100

Category: Chemistry Ch 7 Class 11

A catalyst increases the rate of reaction by:

NTS 2019
Chemistry
Thermochemistry
Elimination Tool:

A) decreasing the activation energy

B) decreasing the concentration of reactants

C) decreasing the temperature

D) increasing the temperature

96 / 100

Category: Chemistry Ch 5 Class 11

Which of the following quantum numbers are for p-subshell?

a

b

c

d

97 / 100

Category: Chemistry Ch 15 Class 12

1 calorie = ______ Joules.

NTS 2012
Chemistry
Chemistry of Life
Elimination Tool:

A) 200 Joules

B) 2000 Joules

C) 4.184 Joules

D) 4180 Joules

98 / 100

Category: Chemistry Ch 11 Class 12

Which of the following is an insecticide?

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

A) DDT

B) Teflon

C) Iodoform

D) Dynamite

99 / 100

Category: Chemistry Ch 1 Class 11

0.5 mole of SO2 contains gram of oxygen?

32

12

16

None

100 / 100

Category: Chemistry

Which of the following has the least electron affinity value?

NUMS Mock 1
Chemistry
Periodicity in Elements

A) 12 C 6

B) 14 N 7

C) 16 8 7

D) 19F 9

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