classification of elements, chemical bonding, periodicity in properties & physical transformation - Category wise Question and Answer Practice Test with Solutions

Question : 21

Match List-I with List-II:

a) A – (4), B – (1), C – (5), D – (3)

b) A – (2), B – (3), C – (1), D – (5)

c) A – (3), B – (1), C – (4), D – (5)

d) A – (3), C – (2), C – (5), D – (1)

Question : 22 [MPPCS (Pre) 2004]

Because of impurities the boiling point of a liquid

a) Decreases

b) Remains constant

c) Increases

d) They are not related

Question : 23

Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively.
It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas, in the case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?

1. In beakers A and B, an exothermic process has occurred.
2. In beakers A and B, an endothermic process has occurred.
3. In beaker C exothermic process has occurred.
4. In beaker C endothermic process has occurred.

a) 1 and 4

b) 1 only

c) 2 only

d) 2 and 3

Question : 24

Which of the following statements about pH and $H^+$ ion concentration are incorrect?

1. Addition of one drop of concentrated HCl in NH₄OH solution decreases pH of the solution.
2. A solution of the mixture of one equivalent of each of CH₃COOH and NaOH has a pH of 7
3. pH of pure neutral water is not zero
4. A cold and concentrated H₂SO₄ has lower $H^+$ ion concentration than a dilute solution of H₂SO₄

a) 1, 2 and 4

b) 1, 2 and 3

c) 1, 3 and 4

d) 2, 3 and 4

Question : 25

Consider the following statements :

1. Living beings carry out their metabolic activities with in an optimal pH range.
2. There are a variety of strengths when you study acids and base.

a) 1 and 2 both

b) 1 only

c) 2 only

d) None