Fermentation is :

• reversible

• exothermic

• endothermic

• None of these

The ionisation percentage of 0.2 M HCN the solution is 0.02%. What will be the value of ionisation constant ?

• 8 x 10^-5

• 8 x 10^-9

• 8 x 10^-7 

• 8 x 10^-3

Which one act as Bronsted acid as well as Bronsted base?

• Cl^-

• OH^-

• HCl

• H₂O

If the pH of HCl soltion is 2 then the molar concentration of this will be :

• 0.01 M

• 2 M

• 0.4 M

• 0.02 M

BF₃ molecule is :

• Lewis base

• Lewis acid

• Neutral

• None of these

Number of electron in one molecule of NH₃ :

• 17

• 34

• 7

• 10

The value of magnetic quantum number for l = 3 :

• 0 , +1 , +2 , +3

• 0 , ± 1 , ± 2 , ± 3

• -1 , -2 , -3

• ± 1 , ± 2 , ± 3

The geometry of ammonia is :

• tetrahedral

• pyramidal

• triangular

• trigonal bipyrarnidal

Which one have the highest melting point ?

• CsCl

• NH₃

• He

• CHCl₃

NO₂ + $\frac{1}{2}$ O₂ $\rightleftharpoons$ NO₃ .......K₁

2NO₂ + O₂ $\rightleftharpoons$ 2NO₃ ........K₂

For the above reaction the relation between equilibrium constant is :

• K₂ = (K₁)²

• K₂ = $\frac{1}{{\mathrm{K}}_1}$

• K₂ = $\frac{1}{{{\mathrm{K}}_1}^2}$

• K₁ = K₂