Chemistry Test 104

Result

Chemistry Test 104

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Weekly Quiz Competition

Question 1
4 / -1

Incorrect statement among the following is :

A
Ethoxymethyl chloride reacts with Nucleophiles 10 times faster than 1–Chlorobutane

B
Ethoxymethyl chloride follows S_N1 mechanism when reacts with Nucleophiles

C
2-Phenylthioethyl chloride reacts with water 600 times as fast as 1-chloropropane

D
Higher rate of 2-Phenylthioethyl chloride is because the neighbouring group participation by phenyl ring.

Solution

Neighboring group participation by a sulphide involved.
Question 2
4 / -1

Which of the following ionic species has maximum ionisation energy?

A
O^–

B
S^–

C
Se^–

D
Te^–

Solution

ΔH_eg (M) = IE(M^¬)

Since sulphar has most –ve electron gain enthalpy hence S^– will have highest IE.
Question 3
4 / -1

Out of the following, which is the correct match for radial probability of finding the electron of 2s orbital?

A
A–H, B–He⁺, C-Li²⁺

B
A–He⁺, B–H, C–Li²⁺

C
A–Li²⁺, B–He⁺, C–H

D
Can't say

Solution

r = r₀ n²/Z

As Z increases, r₀ decreases

Hence upon increasing Z, nuclear distance of node decreases.
Question 4
4 / -1

Correct acidic strength order of the given carbonyl compound is ?

A
IV > I > II > III

B
IV > II > III > I

C
IV > III > II > I

D
IV > I > III > II

Solution

Process of active methylene group acidic strength and the side chain should be e^– withdrawing.
Question 5
4 / -1

Which of the following is correct:

A
S₃O₉ → Contains no S–S linkage

B
HNO₄ → contains no O–O linkage

C
(HPO₃)₃ → contains P–P linkage

D
S₂O₈^2– → contains S–S linkage

Solution

S₃O₉ has no

S – S linkage
Question 6
4 / -1

At 373 K, a gaseous reaction A(g) → 2B(g) + C(g) is found to be of first order. Starting with pure A, the total pressure at the end of 10 min was 176 mm Hg and after a long time when A was completely dissociated, it was 270 mm Hg. Then pressure of A at the end of 10 minutes was :

A
94 mm

B
47 mm

C
43 mm

D
90 mm

Solution

   A → 2B + C

t = 0 a 0 0

t = 10   a – x 2x x

t → ∞ 0 2a a

a + 2x ∝ 176

3a ∝ 270

a ∝ 90

∴   2x ∝ 86

x ∝ 43

a – x ∝ 90 – 43

a – x ∝ 47
Question 7
4 / -1

Incorrectly matched among the following is :

A
A

B
B

C
C

D
D

Solution

Yield of 4-hydroxypentan-2-one is low because aldol and diacetone alcohol are also formed.
Question 8
4 / -1

If Hund's rule is violated, then which among the following will become diamagnetic from paramagnetic

A
C₂

B
CN^–

C
N₂^–2

D
BN

Solution

If hunds rule is followed

N₂^–2 : σ1s² σ*1s² σ2s² σ*2s² σ2π_z² π2p²_x π2p_y² π*2p_x¹ π*2p_y¹

If Hunds rule is not followed

N₂^–2 : σ1s² σ*1s² σ2s² σ*2s² σ2p_z² π2p²_x π2p_y² π*2p_x²
Question 9
4 / -1

Which one is false in the following statements?

A
A catalyst is specific in its action

B
A very small amount of the catalyst alters the rate of a reaction

C
The number of free vacancies on the surface of the catalyst increases on sub-division

D
Nickel is used as a catalyst in the manufacture of ammonia

Solution

Fe acts as catalyst and Mo acts as promoter in Haber's process.
Question 10
4 / -1

In which of the following reaction 1° amine is not obtained as a major product.

A
(1)

B
(2)

C
(3)

D
(4)

Solution