Question # 1

The mass of electron is

Choose an answer

1.602 x 10^-10kg

1.6022 x 10^-19kg

9.1090 x 10^-31kg

None

What would be the heat released when an aqueous solution containing 0.5 mol of HNO₃ is mixed with 0.3 mol of OH^- (enthalpy of neutralization is -57.1 kJ)

Choose an answer

28.5 kJ

17.1 kJ

45.7 kJ

1.7 kJ

In general, for exothermic reactions to be spontaneous

Choose an answer

Temperature should be high

Temperature should be zero

Temperature should be low

Temperature has no effect

The mass of a neutron is times greater than the mass of electron

Choose an answer

540

1840

1480

2000

Charge to mass ratio of electron was discovered by:

Choose an answer

Millikan

Rutherford

J. J. Thomson

Chadwick

Their e/m, ratio resembles with that of electrons

Choose an answer

Alpha rays

Beta rays

Gamma rays

X-rays

When water is added to quick lime,the reaction is

Choose an answer

Explosive

Endothermic

Exothermic

Photochemical

An orbital can accommodate maximum of :

Choose an answer

18 electrons

12 electrons

8 electrons

2 electrons

In chromium (Cr - 24) the number of electrons with azimuthal quantum numbers, l = 1 and 2 are respectively

Choose an answer

12 and 4

12 and 5

4

5

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

Choose an answer

dxy

dxz

dz²

dx²- y²

Lyman series lie in:

Choose an answer

Visible region

Radio-wave region

Infrared region

Ultraviolet region

The maximum number of electrons in d-orbitals is

Choose an answer

6

8

12

10

Balmer series lie in:

Choose an answer

Radio-wave region

Visible region

Ultraviolent region

Infrared region

Evaporation of water is

Choose an answer

An exothermic change

An endothermic change

A process where no heat changes occur.

A process accompanied by chemical reaction.

When atom is in the ground state, the electron is present

Choose an answer

Nearest to the nucleus

Nearest to the valence shell

In the second shell

In the nucleus

The atomic radii of elements lie in the order of

Choose an answer

10⁸cm

10^-12cm

10^-8cm

10¹²cm

The quantum number that specifies the way the orbital is oriented in space is

Choose an answer

Electron spin quantum number

Angular momentum quantum number

Magnetic quantum number

Principle quantum number

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

Choose an answer

5 x 10^-9

5 x 10^-12

5 x 10^-6

5 x 10^-10

Energy of bounden electron in H-atom is always

Choose an answer

Positive

Negative

Zero

Fractional

Neutralization of strong acid with a strong base is:

Choose an answer

spontaneous reaction

reversible reaction

non-spontaneous reaction

chemical equilibrium

Electronic configuration of K

Choose an answer

[Ar] 4s¹

[Ar] 3s¹

[Kr] 4s¹

[He] 2s¹

More Classes

Other Links

MDCAT Chemistry Chapter 3 Atomic Structure Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer