α-particles scattering experiment helped to detect the existence of the nucleus. The main observation of this experiment is 

(D) on the line joining the two particles.

i. True  ii. False, In Rutherford’s experiment of scattering of α-particles by thin gold foil, very few α-particles bounced back. iii. False,  Cathode rays are a stream of very small, negatively charged particles.

Correct option is (A) i and ii Ink is a mixture of dye in water. We can separate the components in the ink. Using evaporation water in ink is evaporated thus...

Correct option is D) gold foil

B) ‘a’ is true, ‘b’ is false

B) melting point

B) force of attraction

A) A is true and R is false