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

Neon shows zero electron affinity due to _____.

(a)

stable arrangement of neutrons

(b)

stable configuration of electrons

(c)

reduced size

(d)

increased density

The green layer found on the copper vessel is due to the formation of ________

(a)

basic copper carbonate

(b)

cupric oxide

(c)

cuprous oxide

(d)

copper chloride

Pottassium belongs to ________ period

(a)

First

(b)

Second

(c)

Third

(d)

Fourth

The distance from the centre of the nucleus to the outer most electron in an ion is termed as _________ radii.

(a)

atomic

(b)

ionic

(c)

Covalent

(d)

both (b) and (c)

The process of extracting the ore from the earth's crust is ____________

(a)

Metallurgy

(b)

Mining

(c)

Smelting

(d)

Leaching

The process of extraction of aluminium from bauxite is called ____________ process

(a)

Hall's

(b)

Baeyer's

(c)

Smelting

(d)

Calcination

The chemical formula of sodium meta aluminate is ___________

(a)

NaAlO₂

(b)

Na₂AlO₂

(c)

NaAl₂O₂

(d)

Na₂Al₂O₃

Blister copper contains _________

(a)

50% pure copper

(b)

99% pure copper and 1% impurities

(c)

98% pure copper and 2% impurities

(d)

75% pure copper and 25% impurities