The most stable compound is

• LiF

• LiCl

• LiBr

• LiI

When copper reacts with hot and conc. H₂SO₄ gives

• H₂

• N₂

• O₂

• SO₂

BaO₂ and ozone reacts to produce

• Ba

• Ba₂O₃

• BaO

• Ba(OH)₃

4.

Heisenberg uncertainty principle can be explained as

• $∆\mathrm{x} \ge \frac{∆\mathrm{P} \times \mathrm{h}}{4\mathrm{\pi }}$

• $∆\mathrm{x} \times ∆\mathrm{P} \ge \frac{\mathrm{h}}{4\mathrm{\pi }}$

• $∆\mathrm{x} \times ∆\mathrm{P} \ge \frac{\mathrm{h}}{\mathrm{\pi }}$

• $∆\mathrm{P} \ge \frac{\mathrm{\pi h}}{∆\mathrm{x}}$

A gas mixture contains O₂ and N₂ in the ratio of 1 : 4 by weight. The ratio of their number of molecules is

• 1 : 8

• 1 : 4

• 3 : 16

• 7 : 32

The de-Broglie wavelenght of a particle with mass 1 kg and velocity 100 m/s is

• 6.6 x 10^-33 m

• 6.6 x 10^-36 m

• 3.3 x 10³³ m

• 3.3 x 10^-36 m

The volume of a gas measured at 27$°$C and 1 atm pressure is 10 L. To reduce the volume to 2 L at 1 atm pressure, the temperature required is

• 60 K

• 75 K

• 150 K

• 225 K

The change in entropy for the fusion of 1 mole of ice is [mp of ice = 273 K, molar enthalpy of fusion for ice= 6.0 kJ mol^-1]

• 11.73 JK^-1 mol^-1

• 18.84 JK^-1 mol^-1

• 21.97 JK^-1 mol^-1

• 24.47 JK^-1 mol^-1

Neutron is discovered by

• Chadwick

• Rutherford

• Yukawa

• Dalton

What is X in the following nuclear reaction?

₇N¹⁴ + ₁H¹ $\to$₈O¹⁵ + X

• ₀n¹

• _-1e⁰

• ₊₁e⁰

• $\mathrm{\gamma }$