Chemistry MCQs

Question 1

Of the following compounds of calcium, the one having highest covalent character is

Accepted Answer

Cal3

Answer

CaF2

Answer

CaCl2

Answer

CaBr2

Question 2

Which one of the following species has the highest bond order, shortest bond length and maximum bond strength?

Accepted Answer

O+2

Answer

O2

Answer

O-2

Answer

O-22

Question 3

The number of hydrogen bonds between guanine and cytosine in DNA is

Accepted Answer

3

Answer

2

Answer

4

Answer

1

Question 4

The structure of (HPO3)3 is

Accepted Answer

Cyclic

Answer

Linear

Answer

Tetrahedral

Answer

Octahedral

Question 5

Spontaneous change is one in which there is:

Accepted Answer

A lowering of free energy

Answer

A lowering of entropy

Answer

Increase in free energy

Answer

An increase in Internal energy

Question 6

Which of the following kinds of spectroscopy can provide information on the energy difference between the initial and final states rather the energy levels involved in the transition?

Accepted Answer

UV photoelectron spectroscopy

Answer

UV absorption spectroscopy

Answer

Infrared absorption spectroscopy

Answer

Rotational spectroscopy

Question 7

When ice cubes are made, the entropy of water

Accepted Answer

Decreases

Answer

Does not change

Answer

Increases

Answer

May either increase or decrease depending on the process used

Question 8

Warming ammonium chloride with sodium hydrochloride in a test tube is an example of

Accepted Answer

Open system

Answer

Closed system

Answer

Isobaric system

Answer

Isothermal system

Question 9

For a spontaneous chemical process, the free energy change is

Accepted Answer

Negative

Answer

Positive

Answer

Zero

Answer

Depends on whether the reaction is exothermic or endothermic