Chemistry Test 152

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Chemistry Test 152

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Weekly Quiz Competition

Question 1
4 / -1

Directions For Questions

The coordination number of Ni⁺² is = 4

NiCl₂ +KCN (Complex) → A (Complex)

A +Conc.HCl (Maximun) →B (Chloro complex)

...view full instructions

The IUPAC name of A and B are :-

A
potassium tetracyanonickelate(II), potassium tetrachloronickelate(II)

B
tetracyanopotassiumnickelate (II), tetrachloro potassiumnickelate (II)

C
tetracyanonickel (II), tetrachloronickel (II)

D
potassiumtetracyanonickel (II), potassiumtetrachloronickel (II)
Question 2
4 / -1

In the following reaction

Identify 'B' ?

A
B₂O₃

B
[BH₂(NH₃)₂]+[BH₄^–]

C
BH₃.NMe₃

D
B₃N₃H₆
Question 3
4 / -1

Magnetic moment of Xⁿ⁺ (Z = 26) is √24 B.M. Hence, number of unpaired electrons and value of n respectively are :

A
4, 2

B
2, 4

C
3, 1

D
0, 2
Question 4
4 / -1

The give successive ionisation energies of an element X are 800, 1427, 2658, 25024 and 32824 kJ mol^-1 respectively. The valency of X is :

A
3

B
5

C
1

D
2
Question 5
4 / -1

Which order are correct ?

(I) Thermal stability : Li₂CO₃ < Na₂CO₃ < K₂CO₃
< Rb₂CO₃ < Cs₂CO₃

(II) Solubility in water : Be (OH)₂ < Mg(OH)₂
< Ca (OH)₂ < Sr(OH)₂ < Ba(OH)₂

(III) Basic nature : Li₂O < Na₂O < K₂O
< Rb₂O < Cs₂O

(IV) Melting point : NaCl > MgCl₂ > AlCl₃

A
I, IV

B
I, II and IV

C
II, III

D
all are correct
Question 6
4 / -1

Which oxide is a basic oxide:

A
B₂O₃

B
Al₂O₃

C
Ga₂O₃

D
Tl₂O₃
Question 7
4 / -1

Statement-1 : The bond angle in BF₃ is smaller than that in BF₄^–.

Statement-2 : BF₃ has sp²-hybridisation, whereas BF₄^– has sp³-hybridisation.

A
Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.

B
Statement-1 is false, Statement-2 is true.

C
Statement-1 is true, Statement-2 is false.

D
Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1.
Question 8
4 / -1

Given the following bond enthalpies :

BE(N≡N) =942 kJ/mol ; BE(H–H) =436 kJ/mol ;

BE(N–N) =163 kJ/mol ; BE(N–H) =390 kJ/mol

Determine enthalpy change for the following polymerisation reaction per mole of N₂(g) consumed -

nN₂(g) + nH₂(g) → –(– NH – NH –)_n–

A
272 kJ

B
136 kJ

C
435 kJ

D
200 kJ

Solution

nN₂(g) + nH₂(g) → –(– NH – NH –)_n–

ΔH = [n × BE (N º N) + n × BE (H – H)

– BE(N – N) × 2n + 2n × BE (N – H)]

∵ n = 1

⇒ ΔH = [BE(N ≡ N) + BE(H – H) –

[BE (N – N) + BE (N – H)] × 2
Question 9
4 / -1

The decomposition of azo methane, at certain temperature according to the equation (CH₃)2N₂ → C₂H₆ + N₂ is a first order reaction. After 40 minutes from the start, the total pressure developed is found to be 350 mm of Hg in place of initial 200 mm of Hg of azo methane. The value of rate constant K is :-

A
2.88 × 10^–4 sec^–1

B
1.25 × 10^–4 sec^–1

C
5.77 × 10^–4 sec^–1

D
None of these
Question 10
4 / -1

Which of the following option show correct matches :-

A
a-q, b-s, c-r, d-p

B
a-s, b-q, c-p, d-r

C
a-r, b-s, c-q, d-t

D
a-q, b-s, c-t, d-p

Solution

Based on definitions.

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Chemistry Test 152

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Chemistry Test 152

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Question 1

potassium tetracyanonickelate(II), potassium tetrachloronickelate(II)

tetracyanopotassiumnickelate (II), tetrachloro potassiumnickelate (II)

tetracyanonickel (II), tetrachloronickel (II)

potassiumtetracyanonickel (II), potassiumtetrachloronickel (II)

Question 2

B2O3

[BH2(NH3)2]+[BH4–]

BH3.NMe3

B3N3H6

Question 3

4, 2

2, 4

3, 1

0, 2

Question 4

3

5

1

2

Question 5

I, IV

I, II and IV

II, III

all are correct

Question 6

B2O3

Al2O3

Ga2O3

Tl2O3

Question 7

Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.

Statement-1 is false, Statement-2 is true.

Statement-1 is true, Statement-2 is false.

Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1.

Question 8

272 kJ

136 kJ

435 kJ

200 kJ

Solution

Question 9

2.88 × 10–4 sec–1

1.25 × 10–4 sec–1

5.77 × 10–4 sec–1

None of these

Question 10

a-q, b-s, c-r, d-p

a-s, b-q, c-p, d-r

a-r, b-s, c-q, d-t

a-q, b-s, c-t, d-p

Solution

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B₂O₃

[BH₂(NH₃)₂]+[BH₄^–]

BH₃.NMe₃

B₃N₃H₆

B₂O₃

Al₂O₃

Ga₂O₃

Tl₂O₃

2.88 × 10^–4 sec^–1

1.25 × 10^–4 sec^–1

5.77 × 10^–4 sec^–1