Question

is as per question paper
Write the correct option number form given option below.
(5)
(1) Disolution of potassium nitrate in water is ........ reaction.
(a) Redox
(b) Reduction
(c) Exothermic (d) Endothermic
(2) Oxidant used for purification of drinking water is.....
(a) Chlorine (b) Sulphuric acid
(c) Ozone
(d) Exothermic
(3) If a ray is incident on a surface at an angle of go to the surface, the
angle of incidence is
(a) 45
(b) 270
(0) 45
(4) The focal lenght of a convex lens is 20 cm, then its power is
(b) 6D
C5D
(0) 2D
(5) Boiling point of ethanol is....
(a) 1700
(b) 780 (c) 870 (d) 1180​

Answer 1

Answer:

1 exothermic

2 chlorine

3 45

4 2D

5 870

Answer 2

Answer:

(1) (b) reduction

(2)(a) chlorine

(3)(a) 45

(4)(0)2D

(5)(b) 780