The basis of modern periodic law is__________.

(a)

atomic number

(b)

atomic mass

(c)

isotopic mass

(d)

number of neutrons

Chemical formula of rust is ________.

(a)

FeO.xH₂O

(b)

FeO₄.xH₂O

(c)

Fe₂O₃.xH₂O

(d)

FeO

The process of coating the surface of metal with a thin layer of zinc is called______.

(a)

painting

(b)

thinning

(c)

galvanization

(d)

electroplating

______ is an important metal to form amalgam.

(a)

Ag

(b)

Hg

(c)

Mg

(d)

Al

Among the halogens which one is most electro-negative?

(a)

Iodine

(b)

Chlorine

(c)

Bromine

(d)

Fluorine

The number of neutrons in ₈O¹⁶ is ________

(a)

8

(b)

16

(c)

32

(d)

24

Potassium belongs to ________ period

(a)

First

(b)

Second

(c)

Third

(d)

Fourth

Which among the following are periodic properties.

(a)

Ionisation energy

(b)

atomic radius

(c)

electronegativity

(d)

all the above

Arrange the following in the increasing order of the size. Cl^-, Cl, Cl⁺

(a)

Cl^- < Cl⁺ < Cl

(b)

Cl₄ < Cl^- < Cl⁺

(c)

Cl⁺ < Cl < Cl^-

(d)

Cl⁺ < Cl < Cl^-

Slag is.

(a)

Metal + Ore

(b)

Ore + Gangue

(c)

Flux + Gangue

(d)

Ore + Flux