## Test Series

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## Test Yourself

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# 1.The most stable compound isLiF LiCl LiBr LiI

A.

LiF

The electronegativity of halogen is as :

F > Cl >  Br > I

Among alkali metals the electropositive character increases as :

Li < Na < K < Rb < Cs

Hence, LiF is the most stable compound.

2.

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

3.

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

4.

When copper reacts with hot and conc. H2SO4 gives

• H2

• N2

• O2

• SO2

5.

What is X in the following nuclear reaction?

7N141H1 $\to$8O15 + X

• 0n1

• -1e0

• +1e0

• $\mathrm{\gamma }$

6.

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

7.

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

8.

BaO2 and ozone reacts to produce

• Ba

• Ba2O3

• BaO

• Ba(OH)3

9.

Heisenberg uncertainty principle can be explained as

10.

Neutron is discovered by

• Rutherford

• Yukawa

• Dalton