KVPY Stream-SA (Class 11) Chemistry: Questions 74 - 78 of 133

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Question number: 74

» P-Block Elements Group 13 to 18 » Group 15 » Phosphorus

Appeared in Year: 2011

MCQ▾

Question

The number of P-H bond (s) in H3PO2,H3PO3andH3PO4 , respectively, is

Choices

Choice (4) Response

a.

2, 0, 1

b.

1, 1, 1

c.

2, 0, 0

d.

2, 1, 0

Question number: 75

» Equilibrium » Ionic Equilibrium » Acid - Base Equilibria

Appeared in Year: 2012

MCQ▾

Question

The major product in the following at 25°C is:

CH3COOHCH3CH2NH2

Choices

Choice (4) Response

a.

CH3CON = CHCH3

b.

CH3CH = NCH2CH3

c.

NH3+ CH2CH3. CH3COO-

d.

CH3CONHCH2CH3

Question number: 76

» Hydrocarbons » Isomerism

Appeared in Year: 2009

MCQ▾

Question

The number of possible structural isomers of C 3 H 4 is

Choices

Choice (4) Response

a.

3

b.

2

c.

4

d.

1

Question number: 77

» Hydrogen » Preparation, Properties and Uses of Hydrogen

Appeared in Year: 2014

MCQ▾

Question

If the radius of the hydrogen atom is 53 pm, the radius of the He+ ion is closest to

Choices

Choice (4) Response

a.

13 pm

b.

108 pm

c.

81 pm

d.

27 pm

Question number: 78

» Atomic Structure » Heisenberg Uncertainty Principle

Assertion-Reason▾

Assertion (Ꭺ)

If an electron is located within the range of 0.1 Å then the uncertainty in velocity is approximately 6×106ms .

(h=6.62×1034kgm2sec1,me=9.1×1031kg)

Reason (Ꭱ)

Trajectory (path of motion) of above electron can defined,

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

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