Which halogen is used as a refrigerant?

which one of the following Is the oxidation number of Iodine in I2?

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

NTS 2017
Chemistry
Atomic Structure
Elimination Tool:

________ 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:

Surface tension in a liquid is caused by?

NTS 2015 DUHS and JSMU
Chemistry
Chemical Bonding
Elimination Tool:

……is a technique to separate impurities from chemical products:

NUMS 2014
Chemistry
Macromolecules
Elimination Tool:

which of the following can not be used to convert butanoic acid to butanoyl chloride?

NUMS Mock 4
Chemistry
Carboxylic Acids and its Derivatives

What is correct relation between Kw, Kb and Ka?

Which of the following is TRUE regarding Methyl Alcohol?

NTS 2011
Chemistry
Alcohols, Phenols and Ethers
Elimination Tool:

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

PMC Sample 2
Chemistry
Alcohols, Phenols and Ethers
Elimination Tool:

If we take 2.2 grams of CO2, 6.02 x 1021atoms of nitrogen. and 0.03-gram atoms of sulfur, then the molar ratio of C, N, and atoms will be:

NTS 2013
Chemistry
Stoichiometry
Elimination Tool:

Example of nucleophile is:

NUMS 2017
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

The oxidation state of “S’ in the (S2O3)-2 is:

PMC 2020
Chemistry
Electrochemistry
Elimination Tool:

Increasing the temperature of a liquid will decrease all except:

If 2-butene is treated with KMnO4 the product formed will be:

Boiling point of Ethyl Alcohol is?

Stronger the oxidizing agent, higher is the:

NUMS 2019 Reconduct
Chemistry
Electrochemistry
Elimination Tool:

Hydrolysis means reaction with

PMC Sample 3
Chemistry
Electrochemistry
Elimination Tool:

Which of the following does not give iodoform test?

NUMS 2014
Chemistry
Aldehydes and Ketones
Elimination Tool:

How many sigma groups are there in benzene?

NTS 2014
Chemistry
Hydrocarbons
Elimination Tool:

Aqueous solutions of Iodine and Sodium hydroxide were mixed in a round bottom flask at 70 C. Following chemical reaction was carried out.

3I2 + 6 NaOH -> NaIO3 + NaI + H2O
This reaction is termed as;

UHS 2019
Chemistry
Solution and Colloids
Elimination Tool:

Which one of the following molecules has the shortest distance of carbon atoms?

PreMedPK MDCAT Mock 3
Chemistry
Hydrocarbons
Elimination Tool:

Which of the following reactions is NOT shown by ketones?

NTS 2018
Chemistry
Aldehydes and Ketones
Elimination Tool:

The rate of E1 reaction depends upon:

NTS 2019
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

Which of following has “higher boiling”and “melting point”?

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

A chemical engineer wants to use the Haber process in order to produce ammonia as raw material for fertilizers. Which of the following parameters must the chemical engineer AVOID in order to obtain the maximum yield of ammonia?
N2(g) + 3H2(g) -> 2NH3(g) ΔH0 = -92.6 kJ/mol

NUMS 2019 Cancelled
Chemistry
Chemical Equilibrium
Elimination Tool:

Covalent hydrides are:

Which of the following is the highest oxidizing agent?

The only o, p−directing group which is deactivating in nature is:

NTS 2014
Chemistry
Alkyl Halides and Amines
Elimination Tool:

Half life period of the first order reaction depends upon:

NUMS 2015
Chemistry
Reaction Kinetics
Elimination Tool:

Conversion of Electrical energy into chemical energy is

PMC Sample 1
Chemistry
Electrochemistry
Elimination Tool:

Propyl Acetate and valeric acid are which type of isomers

NUMS 2018
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

Which one is not true for H2SO4?

NTS 2012
Chemistry
Macromolecules
Elimination Tool:

Which of the following has the highest value of electronegativity?

PMC 2020
Chemistry
s and p Block Elements
Chemical Bonding
Elimination Tool:

From the following, only one amino acid has two identical groups attached to its central atom. Which amino acid out of the following matches the description given above.

NUMS Mock 3
Chemistry
Chemistry of Life

A system at equilibrium can be disturbed by:

NUMS Mock 4
Chemistry
Chemical Equilibrium

Which of the following compounds is responsible for the depletion of ozone layer?

UHS 2019
Chemistry
Environmental Chemistry
Elimination Tool:

The sugar unit in DNA molecule is:

NUMS 2019 Reconduct
Chemistry
Macromolecules
Elimination Tool:

Formula mass is considered for compounds instead of their molecular mass.

PMC Practice 21
Chemistry
Introduction to Fundamental Concepts of Chemistry
Elimination Tool:

Ketone reacts with Grignard reagent to form ______ in acidic media?

NTS 2015 SMBBMC
Chemistry
Aldehydes and Ketones
Elimination Tool:

Rate of effusion of a gas depends upon:

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

Which step should be repeated over and over to get a variety of substituted products?

PreMedPK MDCAT Mock 5
Chemistry
Hydrocarbons
Elimination Tool:

Activated complex is formed due to

PMC Sample 3
Chemistry
Reaction Kinetics
Elimination Tool:

Phenol Acts as

The relation between first and second ionization potentials of a given atom is:

NUMS Mock 4
Chemistry
Chemical Bonding

Vapor pressure depends on:

The compound in which carbon uses only its sp3 – hybrid orbitals for bond formation is?

NTS 2015 DUHS and JSMU
Chemistry
Chemical Bonding
Elimination Tool:

Ethyl iodide and n-propyl iodide are allowed to undergo Wurtz reaction. The alkane which will not be obtained in this reaction is:

NUMS 2016
Chemistry
Alkyl Halides and Amines
Elimination Tool:

Ketones can be made by oxidation of:

NUMS Mock 2
Chemistry
Aldehydes and Ketones

Hydrogen resembles with alkali metals in all respects except

NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:

Which of the following is not a derivative of benzene?

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

Silver oxide decomposes when heated to silver and oxygen. If 0.5 moles of lunar caustic is heated up to 450 degrees, giving out Nitrogen dioxide and oxygen leaving silver as metal, what is the mass of the residue?

NTS 2015 SMBBMC
Chemistry
Stoichiometry
Elimination Tool:

Paramagnetism is due to:

The formula of esters is

PMC Sample 2
Chemistry
Carboxylic Acids and its Derivatives
Elimination Tool:

In general formula of alkyl halide RX, X represents ________

PMC Sample 2
Chemistry
Alkyl Halides and Amines
Elimination Tool:

Breaking of neutron produces?

Genetic mutations occur in:

NUMS 2016
Chemistry
Chemistry of Life
Elimination Tool:

Which of the following is secondary pollutant?

NUMS 2019 Reconduct
Chemistry
Environmental Chemistry
Elimination Tool:

The structure of cyclohexane is:

PMC Sample 3
Chemistry
Hydrocarbons
Elimination Tool:

Which of the following is the most environmentally-friendly source to derive energy?

UHS 2017 Reconduct
Chemistry
Environmental Chemistry
Elimination Tool:

What are the products of the below-mentioned equation?

HNO3 +3HCI→

NTS 2019
Chemistry
Periodicity in Elements
Elimination Tool:

Chloro-fluoro carbons cause

The type of isomerism existing in a compound of molecular formula C2H6O is:

PMC 2020
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

Which of the following substances exhibits hydrogen bonding?

NUMS Mock 4
Chemistry
Chemical Bonding

In which of the following reaction alkyl ketones are converted Into carboxylic acid with one carbon atom less than the parent compound?

Methylated spirit Is % methanol and % ethanol:

The stability in the following structure is due to the:

NUMS Mock 4
Chemistry
Chemical Bonding

Which of the following pair groups belong to meta directing Groups?

NTS 2019
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

Variable valency is generally exhibited by:

NUMS 2014
Chemistry
d and f Block Elements
Elimination Tool:

The rate of a chemical reaction is directly proportional to the product of active masses of the reactants, it is referred to as:

NTS 2018
Chemistry
Reaction Kinetics
Elimination Tool:

The value of R (the gas constant) is

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

Which of the following is an addition polymer?

NUMS 2019 Reconduct
Chemistry
Macromolecules
Elimination Tool:

The thermal energy at constant pressure is called:

PMC 2020
Chemistry
Thermochemistry
Elimination Tool:

Which alkyl halide has the lowest reactivity for a particular alkyl group?

NTS 2018
Chemistry
Alkyl Halides and Amines
Elimination Tool:

Which of the following show halogens?

If 18.0 g of glucose is dissolved in 1 kg of water, boiling point of this solution should be:

UHS 2013
Chemistry
Solution and Colloids
Elimination Tool:

Filtration process could be very time consuming if it is not aided by a gentle suction which is developed:

7) Gypsum supplies to soil

In rhombic sulphur there are atoms in each molecule?

An element has configuration 2, 8, 1. It belongs to, ______.

NTS 2016 SMBBMC
Chemistry
Atomic Structure
Elimination Tool:

Densities of alkali metals are low due to:

PMC 2020
Chemistry
s and p Block Elements
Elimination Tool:

CO2 and SO2 both are tri-atomic molecules but heat of vaporization of SO2 is greater than that of CO2 due to:

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

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

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

Which one of the following is an acid?

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

NUMS 2019 Cancelled
Chemistry
Alkyl Halides and Amines
Elimination Tool:

______ is needed in thyroxine, the hormone of thyroid gland.

NTS 2012
Chemistry
Chemistry of Life
Elimination Tool:

Which of the following is the most environmentally friendly source to derive energy?

NUMS Mock 1
Chemistry
Environmental Chemistry

Amino acid is usually known by a

The strength of an acid depends on?

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

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

PMC Practice 1
Chemistry
Thermochemistry
Elimination Tool: