set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

Because of impurities the boiling point of a liquid

a) Decreases

b) Remains constant

c) Increases

d) They are not related

Question : 3

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 : 4

If the valene shell electronic configuration for an element is $ns^2np^5$, this element will belong to the group of –

a) inert metals

b) noble gases

c) alkali metals

d) halogens

Question : 5

Which one of the following is a diagonally related pair?

a) Na, Mg

b) B, Si

c) H, Be

d) K, Ca

Question : 6

In the KMnO₄ molecule, the oxidation states of the elements Potassium (K), Manganese (Mn) and Oxygen (O) are respectively

a) +1, +7, – 2

b) 0, 0, 0

c) +1, +5, – 2

d) +1, +7, 0