Chemistry Test 38

Result

Chemistry Test 38

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Weekly Quiz Competition

Question 1
4 / -1

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
b, c

B
a, b

C
b, c, d

D
c, d
Question 2
4 / -1

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 :-

A
0.384 min

B
0.15 min

C
3 min

D
3.84 min
Question 3
4 / -1

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 :-

A
85%

B
8.39%

C
90%

D
100%
Question 4
4 / -1

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

A
KMnO₄

B
K₂Cr₂O₇

C
CrO₃

D
PCC (Pyridiniumchlorochromate)