NEET Chemistry: Questions 279 - 285 of 677

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Question number: 279

» Atomic Structure » Quantum Mechanics

MCQ▾

Question

The wave-mechanical model of atom is based upon -

Choices

Choice (4) Response

a.

De Broglie concept of dual character of matter

b.

Heisenberg’s uncertainty principle

c.

Schrodinger wave equation

d.

All a. , b. and c. are correct

Question number: 280

» P-Block Elements Group 13 to 18 » Group 18 » Noble Gases

MCQ▾

Question

Number of atoms of He in 100 amu of He are?

Choices

Choice (4) Response

a.

100×6×1023

b.

100

c.

50

d.

25

Question number: 281

» Atomic Structure » Heisenberg Uncertainty Principle

MCQ▾

Question

If uncertainty in position and momentum are equal, the uncertainty in velocity is –

Choices

Choice (4) Response

a.

h/π

b.

12mh/π

c.

h/2π

d.

Question does not provide sufficient data or is vague

Question number: 282

» Equilibrium » Ionic Equilibrium » Acid - Base Equilibria

MCQ▾

Question

0.45 gm. of an acid of mol. wt. 90 was neutralized by 20 ml of 0.5 (N) caustic potash. The basicity of acid is-

Choices

Choice (4) Response

a.

1

b.

4

c.

2

d.

3

Question number: 283

» Atomic Structure » Spin Quantum Number

MCQ▾

Question

The maximum number of atomic orbitals associated with a principal quantum number 5 is -

Choices

Choice (4) Response

a.

12

b.

25

c.

9

d.

16

Question number: 284

» P-Block Elements Group 13 to 18 » Group 17 » Oxides and Oxoacids of Halogens

MCQ▾

Question

Which of following oxyacid of chlorine is formed on shaking chlorine water with freshly precipitated yellow oxide of mercury?

Choices

Choice (4) Response

a.

HClO4

b.

HClO3

c.

HClO2

d.

HClO

Question number: 285

» P-Block Elements Group 13 to 18 » Group 17 » Oxides and Oxoacids of Halogens

MCQ▾

Question

Euchlorine is

Choices

Choice (4) Response

a.

chlorine of europium

b.

a mixture of Cl2 and ClO2

c.

a mixture of Cl2 and Cl2O7

d.

obtained by heating per chlorate with concentrated HCl

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