Question

Q.1 Fill in the blanks : [4]

i) ________and________ are collectively known as nucleons.

ii) Chemical change involves evolution or absorption of_______.

iii) Cathode rays are deflected towards_______ plate in the presence of an electric field.



Q.2 Give one word for the following : [4]

i) Atom with no neutron.

ii) The lightest noble gas.

iii) The intermolecular force acting between different kinds of molecules.

iv) The scientist who discovered the electrons.



Q.3 State whether the following statements are true or false : [4]

i) Neutron is a negatively charged particle.

ii) An atom is electrically charged particle.

iii) Rusting of iron is a fast physical change.

iv) Liquids have only one free surface.



Q.4 Choose the correct option : [4]

i) State of matter which is highly compressible -

(a) Solid (b) Liquid

(c) Gas

ii) The maximum number of electrons in L-shell are -

(a) 2 (b) 8

(c) 18

iii) The room fresheners are based on the property of -

(a) Melting (b) Diffusion

(c) Fusion

iv) The atomic number of an atom with electronic configuration 2,8,2 is -

(a) 8 (b) 10

(c) 12​

Answer 1

Answer:

1 )  

i) neutron and proton

ii)  heat

iii) positive

2)

i) hydrogen

ii) helium

iii) hydrogen bonding , diplole - dipole and van der waals' forces of attraction

iv) J. J . Thomson

3)

i) false

ii) false

iii) false

iv)true

4)

i) gas

ii) 2

iii) diffusion

iv) 12

Explanation: