What volume of oxygen is produced from the decomposition of 2 mole of KCIO₃ at s.t.p?
[Molar volume of a gas at s.t.p = 22.4 dm³]

A. 22.4 dm³

B. 33.6 dm³

C. 44.8 dm³

D. 67.2 dm³

Which of the following is physical change?

A. Burning kerosene

B. Freezing ice cream

C. Exposing white phosphorus

D. Dissolving calcium in water

What is the percentage by mass of oxygen in Al₂(SO₄)₃. 2H₂O?
[Al = 27, S = 32, H = 1, O = 16]

A. 14.29%

B. 25.39%

C. 50.79%

D. 59.25%

The filter in the cigarette reduces the nicotine content by

A. Burning

B. Adsorption

C. Evaporation

D. Absorption

3Cu + pHNO₃ →3Cu(NO)₂ + 4H₂ O + xNO
In the equation above, the values of p and x respectively are

A. 1 and 3

B. 2 and 3

C. 6 and 2

D. 8 and 2

Neutral atoms of neon with atomic number 10 have the same number of electron as

A. O²⁺

B. Ca²⁺

C. K⁺

D. Mg²⁺

The noble gases owe their inactivity to

A. Octet configuration

B. Cyclic shape

C. Hexagonal shape

D. Obtuse configuration

According to the kinetic theory, an increase in temperature causes the kinetic energy of particles to

A. Decrease

B. Increase

C. Remain constant

D. Be zero

I. H = 1s¹ II. N = 1s² 2s² p³ III. O = 1s² 2s² p⁴ IV. Zn = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰
From the above, which of the following pairs is like to be pa

A. I and II

B. I and III

C. I and IV

D. III and IV

A gas exerts pressure on its container because

A. some of its molecules are moving faster than others

B. of the collision of the molecules with each other

C. of the mass of the molecules of gas

D. the molecules of a gas colide with the walls of the container