Chemistry Test ...

The major role of fluorspar (CaF₂) which is added in small quantity in the electrolytic reduction of alumina dissolved in fused cryolite (Na₃AlF₆) is :-

(a) as a catalyst

(b) to make the fused mixture very conducting

(c) to lower the temperature of melting

(d) to decrease the rate of oxidation of carbon at the anode

A reaction with respect to reactant A has rate constant 6 min^–1. If we start with [A] = 0.5 mol/L. when would [A] reach the value 0.05 mol/L :-

If the observed and theoretical molecular mass of NaCl is found to be 31.80 and 58.80 respectively then the degree of dissociation of NaCl is :-

The most suitable reagent for the conversion of RCH₂OH → RCHO is :-