Chemistry Test 125

Result

Chemistry Test 125

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Weekly Quiz Competition

Question 1
4 / -1

A current of 0.0965 ampere is passed for 1000 seconds through 50ml of 0.1 M NaCl, using inert electrodes the average concentration of OH^– in the final solution is

A
0.01 M

B
0.02 M

C
0.03 M

D
0.04 M

Solution
Question 2
4 / -1

Dry air was drawn through bulbs containing pure water ,then through bulbs containing a solution of 600 grams of a non electrolyte in 360 grams of water at the same temperature and finally through a tube in which dried CaCl₂ was placed. The solution bulbs gained 1.5 gram and the dried CaCl₂ gained 2 gram.The Molecular mass of the solute is :-

A
40

B
9

C
90

D
50

Solution
Question 3
4 / -1

Which of the following reaction is incorrectly matched with their major product :

A

B

C

D
Et – Cl + AgCN Et – CN + AgCl
Question 4
4 / -1

Which of the following ore is not the ore of Fe?

A
Magnetite

B
Magnesite

C
Limonite

D
Siderite

Solution

[Magnesite: MgCO₃]
Question 5
4 / -1

A current of 0.965 ampere is passed through the solution of CH₃COO^–K⁺ having volume 100 ml for 100 minutes. Assuming no change in volume and temperature of solution and all the gases obtained (if any) at any electrode is collected separately at STP, the correct information (s) is /are -
[Given : log2 = 0.3, log3 = 0.48 ]

A
2.64 gm CO₂ gas is produced at anode

B
681 ml H₂ gas is produced at cathode

C
C₂H₆ gas is also produced at anode

D
All are correct

Solution
Question 6
4 / -1

Correct statement is -

A
Order of reactivity in E₁ mechanism

B
Order of nucleophilicity
F^– < Cl^– < Br– < I^– (in H₂O)

C
Order of reactivity in S_N1 mechanism

D
All are correct
Question 7
4 / -1

Correct statement for the given sequence of reaction is/are :

A
The conversion from (P) to (Q) is S_N2 reaction

B
The conversion from (Q) to (A + B) is S_N2 reaction

C
The configuration of product Q is 'R'

D
All are correct

Solution
Question 8
4 / -1

Consider the following reactions that occur in the extraction of lead by self reduction :

and select CORRECT statement(s).

A
PbS and PbO do not melt at temperature T₂.

B
Reaction (ii) is exothermic

C
In reaction (iii), redox reaction occurs between S^2– and Pb²⁺

D
All are correct

Solution

PbS + 2PbO  3PbO + SO₂ → Self reduction process.

*   Roasting is done just below fusion temperature, in presence of excess of air.
So both sulphide (PbS) and oxide (PbO) does not melt at T₂ (Roasting temperature)
*   Roasting process is exothermic process.
*   III reaction

3Pb⁺² + 6e^– → 3Pb

Redox reaction occures.
(iv)   ΔG = ΔH – TΔS
for above reaction ΔS_r > O since SO₂(g) is getting released
So if Pb(lead) is also comes out to be in liquid form than ΔS_r will become more positive, leading to ΔG be more negative.
So thermodynamic feasibility (ΔG < 0) increases when lead (Pb) is in molten form.
ABCD are correct answers
Question 9
4 / -1

Resistance of a conductivity cell filled with 0.01 M HA (aq.) solution is 200 Ω at 300K. (HA is weak monoprotic acid). If cell constant is 4 cm^–1 & (HA) is 2 Ω^–1m²mol^–1. (R = 0.08 bar/mol-k)

Molar conductivity of 0.01M HA (Ω^–1cm²mol^–1)

A
2 × 10³

B
2 × 10²

C
4.0 × 10³

D
4.0 × 10²

Solution
Question 10
4 / -1

Resistance of a conductivity cell filled with 0.01 M HA (aq.) solution is 200 Ω at 300K. (HA is weak monoprotic acid). If cell constant is 4 cm^–1 & (HA) is 2 Ω^–1m²mol^–1. (R = 0.08 bar/mol-k)

Osmotic pressure of 0.01M HA(aq.) at 300K is -

A
2.64 bar

B
0.264 bar

C
0.24 bar

D
0.48 bar

Solution