Solvay process is used in the manufacture of

• K₂CO₃

• KHCO₃

• Na₂CO₃

• CaCl₂

Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not formed in these reactions?

• B₂H₆ 2NH₃

• B₁₂H₁₂

• B₃N₃H₆

• (BN)_n

The acceptable level of carbon monoxide gas (CO) in the atmosphere in ppm level is

• 9

• 250

• 49

• 850

Diels-Alder reaction will not take place with which of the following reactants?

In which of the following, ortho/para substitution by an electrophile is very facile?

• Ntrobenzene

• Phenol

• Benzoic acid 

• Acetophenone

Reduction of nitrobenzene with Zn and alcoholic KOH solution results in the formation of the following compound.

• hydrazobenzene

• azobenzene

• aniline

• phenylhydroxylamine

A solution of concentration C g equiv/L has a specific resistance R. The equivalent conductance of the solution is

• R/C

• C/R

• 1000/RC

• 1000R/C

18.

Assertion (A): White tin is an example of tetragonal system.
Reasoning (R): For a tetragonal system a= b = c and  α = β = γ ≠ 90°. The correct answer is

• (A) and (R) are true and (R) is the correct explanation of (A).

• Both (A) and (R) are true and (R) is not the correct explanation of (A).

• (A) is true but (R) is not true.

• (A) is not true but (R) is true.

What is the slope of the straight line for the graph drawn between ln k and 1/T, where k is the rate constant of a reaction at temperature T?

• -E_a/ 2.303R

• -E_a/R

• E_a/R

• R/E_a

Which one of the following is the mineral for tin?

• Galena

• Cerussite

• Cassiterite

• Anglesite