Chemistry Past Questions and Answers

On which of the following is the solubility of a gaseous substance dependent?
I. Nature of solvent
II. Nature of solute
III. Temperature
IV. Pressure

A I, II, III and IV
B I and II only
C II only
D I, III and IV only

Question 17:

Which of the following statements is correct about the periodic table?

A Elements in the same period have the same number of valence electrons
B The valence electrons of the elements in the same period increase progressively across the period
C Elements in the same group have the same number of electron shells
D The non-metallic Properties of the elements tend to decrease across each period

Question 18:

The periodic classification is an arrangement of the elements

A Atomic weights
B Isotopic weights
C Molecular weights
D Atomic numbers

Question 19:

If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litres of water and the resulting solution mixed thoroughly, the resulting sulphuric acid concentration will be

A 2.2M
B 1.1M
C 0.22M
D 0.11M

Question 20:

In the shown experiment (Fig. 1) the litmus paper will initially

A Be bleached
B Turn green
C Turn red
D Turn blue