R P Rana Solutions for Chapter: Sample Test Paper 1, Exercise 1: Exercise 1

Write any three characteristics of physical and chemical change.

 

Explain any three separating techniques used to separate mixtures.

Explain the experiments performed by scientists for the discovery of electrons.

Write the molecular formula of the ferrous sulphide.
 

Write the molecular formula of the barium chloride ${\mathrm{Ba}}_{\mathrm{x}}{\mathrm{Cl}}_{\mathrm{y}}$.

The x and y in the formula can be-

A. x = 2, y = 2

B. x = 1, y = 2

C. x = 2, y = 1

"Enter your correct answer as A, B or C."

Write the molecular formula of the nitrogen dioxide ${\mathrm{N}}_{\mathrm{x}}{\mathrm{O}}_{\mathrm{y}}$.

The value of x and y in the formula can be-

A. x = 1, y = 2

B. x = 2, y = 2

C. x = 2, y = 1

"Enter your correct answer as A, B or C."

Write the molecular formula of the calcium chloride ${\mathrm{Ca}}_{\mathrm{x}}{\mathrm{Cl}}_{\mathrm{y}}$.

The value of x and y in the formula can be-

A. $\mathrm{x} = 1, \mathrm{y} = 2$

B. $\mathrm{x} = 2, \mathrm{y} = 2$

C. $\mathrm{x} = 2, \mathrm{y} = 1$

"Enter your correct answer as A, B or C."

Write the molecular formula of the zinc oxide.