One 'U' stands for the mass of ______________.

(a)

An atom of carbon-12

(b)

1/12^th of the carbon-12

(c)

1/12th of a hydrogen atom

(d)

One atom of any of the element

Which of the following about the electron is incorrect?

(a)

It is a negatively charged particle.

(b)

The mass of electron is equal to the mass of neutron .

(c)

It is a basic constituent of all the atoms

(d)

electron mass = 9.10938356 x 10^-31kilograms

Statement-I: Ionization enthalpy of nitrogen is greater than that of oxygen.
Statement-II: Nitrogen has exactly half filled electronic configuration which is more stable than electronic configuration of oxygen.

(a)

Statement-I is wrong but statement-II is correct.

(b)

Statement-I is correct but statement-II is wrong.

(c)

Statement-I and II are correct and statement-II is the correct explanation of statement-I.

(d)

Statement-I and II are correct but statement-II is not the correct explanation of statement-I.

The hydration enthalpies of alkali metal ions decreases in ______ order.

(a)

Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺

(b)

Cs⁺ > Rb⁺ > K⁺ > Na⁺ > Li⁺

(c)

Li⁺ > Rb⁺ > K⁺ > Na⁺ > Cs⁺

(d)

Rb⁺ > Cs⁺ > K⁺ > Na⁺ > Li⁺

Quick lime is ________

(a)

CaCO₃

(b)

CaO

(c)

CaSO₄.2H₂O

(d)

Ca(OH)₂

Which of the following is the correct mathematical relation for Charles' law at constant pressure?

(a)

\(V\propto T\)

(b)

\(V\propto t\)

(c)

\(V\propto \frac{1}{T}\)

(d)

all of above

In an adiabatic process, no transfer of heat takes place between the system and surroundings. Choose the convert option for free expansion of ideal gas under adiabatic conditions from the following:

(a)

q=0; \(\Delta\)T \(\neq \)0; w = 0

(b)

q\(\neq \)0;\(\Delta\)T =0; w = 0

(c)

q = 0; \(\Delta\)T = 0; w = 0

(d)

q = 0; \(\Delta\)T < 0; w \(\neq \)0

The active mass of 7.0 g of nitrogen in a 2.0 L container would be ____________

(a)

0.25

(b)

0.125

(c)

0.5

(d)

14.0

Find out the most favourable condition for electrovalent bonding.

(a)

Low ionization potential of one atom and high electron affinity of the other atom.

(b)

High electron affinity and high ionisation potential of both the atoms.

(c)

Low electron affinity and low ionisation potential of both the atoms.

(d)

High ionisation potential of one atom and low electron affinity of the other atom.

Which metal is used to prepare Lassaigne's extract?

(a)

Copper

(b)

Sodium

(c)

Aluminium

(d)

Iron