JEE Main Test 142

Result

JEE Main Test 142

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Weekly Quiz Competition

Question 1
4 / -1

The half-life period of radioactive element is 140 days. After 560 days, 1 g of element will reduce to

A

B

C

D

Solution
Question 2
4 / -1

Correct order of decreasing thermal stabililty is as

A
NH₃ > PH₃ > AsH₃ > SbH₃

B
PH₃ > NH₃ > AsH₃ > SbH₃

C
AsH₃ > PH₃ > NH₃ > SbH₃

D
SbH₃ > AsH₃ > PH₃ > NH₃

Solution
Question 3
4 / -1

When dil. H₂ SO₄ is added to aqueous solution of potassium chromate, yellow colour of solution turns to orange colour. It indicates

A
chromate ions are reduced

B
chromate ions are oxidised

C
monocentric complex is converted into dicentric complex

D
oxygen gets removed from chromate ions

Solution

When dil. H₂SO₄ is added to aqueous solution of K₂CrO₄, yellow color of solution turns to orange colour (i.e. K₂Cr₂O₇). So if the solution turned from yellow, to orange, the equilibrium was shifted to the right, if the solution turned yellow, the equilibrium was shifted to the left.

Hence it indicates that monocentric complex is converted into dicentric complex.
Question 4
4 / -1

Which requires catalyst ?

A
S + O₂ → SO₂

B
2SO₂ + O₂ → 2SO₃

C
C + O₂ → CO₂

D
All of the above

Solution
Question 5
4 / -1

Which of the following system is most stable for a chelate ?

A
Two fused cyclic system

B
Three fused cyclic system

C
Four fused cyclic system

D
Five fused cyclic system

Solution

Chelates are more stable than non – chelated compounds of comparable composition and the more extensive the chelation – i.e., the larger the number of ring closures to a metal atom, the more stable the compound.

Therefore five fused cyclid system is most stable for a chelate.
Question 6
4 / -1

The final product, in the below reaction, is

A

B

C

D

Solution

Bromination of aniline yields tribromo aniline Diacotization of the product followed by treatement with trifluoro – hydrido – boron removes amine group.
Question 7
4 / -1

Reduction of nitrobenzene in the presence of Zn /NH₄ Cl gives

A
azobenzene

B
hydrazobenzene

C
N-phenyl hydroxylamine

D
aniline

Solution

Zinc dust and ammonium chloride convert nitro benzene to the corresponding hydroxylamine
Question 8
4 / -1

Secondary nitro alkanes can be converted into ketones by using Y. Identify Y from the following.

A
Aqueous HCl

B
Aqueous NaOH

C
KMnO₄

D
CO
Question 9
4 / -1

OB and OC are two roads enclosing an angle of 120°. X and Y start from 0 at the same time. X travels along OB with a speed of 4 km/h and Y travels along OC with a speed of 3 km/h. The rate at which the shortest distance between X and Y is increasing after 1 h is

A
√37 km/h

B
37 km/h

C
13 km/h

D
√13 km/h

Solution
Question 10
4 / -1

A
even and strictly increasing in (0, ∞)

B
odd and is strictly decreasing in (- ∞, 0)

C
odd and is strictly decreasing in (-∞, ∞)

D
neither even nor odd but is strictly increasing in (-∞, ∞)

Solution