Chemistry Test 151

Result

Chemistry Test 151

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following match are incorrect:-

(a) Goldschmidt aluminothermite process-Cr₂O₃

(b) Mac Arther cyanide process - Fe

(c) Mond process - Ni

(d) Van Arkel process – Au

A
a, c

B
c, d

C
b, d

D
a, b
Question 2
4 / -1

x, y and z are respectively :-

A
1, 2, 3

B
1, 5, 3

C
1, 3, 5

D
5, 3, 1
Question 3
4 / -1

In which of the following reaction H₂O₂ acts as a reducing agent ?

(a) H₂O₂ + 2H⁺ + 2e^– → 2H₂O

(b) H₂O₂ – 2e^– → O₂ + 2H⁺

(c) H₂O₂ + 2e^– → 2OH^–

(d) H₂O₂ + 2OH^– – 2e^– → O₂ + 2H₂O

A
(a), (c)

B
(b), (d)

C
(a), (b)

D
(c), (d)
Question 4
4 / -1

Which of the following reaction(s) proceeds for not completion of octet?

A
B₂H₆ + 2NMe₃ → 2BH₃.NMe₃

B

C
2AlCl₃ → Al₂Cl₆

D
2ICl₃ → I₂Cl₆
Question 5
4 / -1

Two gases in adjoining vessels were brought into contact, by opening a stop cock between them, one vessel contains 0.25 litre volume of NO at 800 torr at 220 K, the other measured 0.1 litre and contained O₂ at 600 torr at 220 K. The reaction to form N₂O₄(s) exhausts the limiting reactant completely. Neglecting the vapour pressure of N₂O₄, What mass of N₂O₄ is formed :-

A
0.402 gm

B
4.02 gm

C
.0402 gm

D
40.2 gm

Solution
Question 6
4 / -1

10 mol of an ideal gas is heated at constant pressure of 1 atmosphere from 27°C to 127°C.

If C_v,m = (20 + 10^–2T) JK^–1 mol^–1 then ΔH for the process is :-

A
23500 J

B
25500 J

C
31814 J

D
22000 J

Solution
Question 7
4 / -1

Activation energy of forward and backward process of a reaction are 60 kJ mol^–1 and 40 kJ mol^–1 respectively. Which of the following are true for the reaction?

A
It is endothermic reaction

B
It is exothermic reaction

C
Heat of reaction is –20 KJ mol^–1

D
Threshold energy of reaction is 100 KJ mol^–1

Solution

ΔH = Eaf –Eab

= 60 – 40

ΔH = 20 kJ mol^–1

∴ Endothermic reaction
Question 8
4 / -1

If all the atoms touching one face plane are removed in solid NaCl, then the formula of the compound left and the defect is given by :-

A
Na₄Cl₃, schottky defect

B
NaCl, schottky defect

C
Na₂Cl, frenkel defect

D
Na₂Cl, schottky defect

Solution

Also since equal number of cations and anions are missing defect is schottky defect.
Question 9
4 / -1

The acid ionisation of hydrated zinc ions is

Zn(H₂O)₆²⁺(aq) + H₂O(ℓ) ⇌ (O)₅OH⁺(aq) +H₃O⁺(aq)

and K_a is 1.25 × 10^–10. The pH of 0.8 M aqueous solution of ZnCl₂ is [log 2 = 0.3]

A
4.0

B
4.7

C
5.0

D
5.3

Solution
Question 10
4 / -1

When a direct current source is passed through colloidal iron (III) hydroxide, using inert electrode,

A
Precipitate is collected near positive electrode

B
Precipitate is collected near negative electrode

C
O₂ gas is produced at cathode.

D
H₂ gas is produced at positive electrode

Solution

Fe(OH)₃ is positively charged sol, hence if direct current is passed coagulation will take place at cathode (negative electrode)