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JEE Chemistry Solved Question Paper 2014

Multiple Choice Questions

11.
What is the pH of millimolar solution of ammonium hydroxide which is 20% dissociated?

3.699

10.301

4.691

9.301

10.301

$Concentration of {NH}_{4} OH solution = 0.001 M Degree of dissociation = 20 % = \frac{20}{100} = 0.2 Concentration of {OH}^{-} i . e ., [{OH}^{-}] = Concentration of solution \times degree of dissociation = 0.001 \times 0.02 = 2 \times 10^{- 4} ∵ [H^{+}] [{OH}^{-}] = 1 \times 10^{- 14} ∵ [H^{+}] = \frac{1 \times 10^{- 14}}{2 \times 10^{- 4}} = \frac{1}{2} \times 10^{- 10} Again, : pH = - \log [H^{+}] pH = - \log (\frac{1}{2} \times 10^{- 10}) = - \log (- 10 - 0.3010) = 10.3010$

12.

What is the geometry of molecule of bromine penta fluoride?

Square planar
Trigonal bipyramidal
Squre pyramidal
Octahedral

13.

What is the mass of one molecule of yellow phosphorus? (Atomic mass, P = 30)

1.993 × 10^-22 kg
1.993 × 10^-19 mg
4.983 × 10^-20 kg
4.983 × 10^-23 mg

14.

Bond order of which among the following molecules is zero?

F₂
O₂
Be₂
Li₂

15.

Identify the compound 'D' in the following series of reactions.

16.

Ozone is present as a chief constituent in which region of the atmosphere?

Troposphere
Stratosphere
Mesosphere
Thermosphere

17.

Amongst the following, select the element having highest ionization enthalpy.

Sodium
Potassium
Beryllium
Magnesium

18.

Benzene can be conveniently converted into n-propyl benzene by

Friedel-Craft alkylation with n-propyl chloride
Friedel-Craft acylation with propionyl chloride followed by Wolff-Kishner reduction
Friedel-Craft acylation with propionyl chloride followed by catalytic hydrogenation
Friedel-Craft acylation with propionyl chloride followed by reduction with LiAlH₄