Chemistry Test 54

Result

Chemistry Test 54

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following species is not a pseudo halide :-

A
CNO^–

B
RCOO^–

C
CN^–

D
N₃^–

Solution

In pseudo halide 'N' must be present.
Question 2
4 / -1

During which of the following extraction of metal poling process is used :-

A
Zn

B
Cu

C
Mg

D
Both (2) and (3)
Question 3
4 / -1

Electrode potential data of few cells is given below. Based on the data, arrange the ions in increasing order of their reducing power :-

Fe³⁺_(aq) + e^– → Fe²⁺_(aq); E° = +0.77 V

Al³⁺_(aq) + 3e^– → Al_(s); E° = –1.66 V

Br_2(aq) + 2e^– → 2Br^–_(aq); E° = +1.09 V

A
Br^– < Fe²⁺ < Al

B
Fe²⁺ < Al < Br^–

C
Al < Br^– < Fe²⁺

D
Al < Fe²⁺ < Br^–
Question 4
4 / -1

For oxidation of iron, 4Fe(s) + 3O₂(g) → 2Fe₂O₃(s) entropy change is – 549.4 JK^–1mol^–1 at 298K. ∆_rH° for this reaction is – 1648 × 10³ Jmol^–1

Above reaction is :-

A
Spontaneous

B
Non-spontaneous

C
At equilibrium

D
Cant predict

Solution

ΔG = ΔH – T.ΔS