Consider the following statements
i) Matter possesses mass.
ii) 22-carat gold is a mixture.
iii) Dry ice is a compound.
Which of the following statement(s) given above is/ are correct?

(a)

1 & 3

(b)

Only 1

(c)

1 & 2

(d)

1,2, & 3

Which one of the following orbitals is spherical in shape?

(a)

4s

(b)

3p

(c)

3d

(d)

4f

Law of triad was unable to explain for the element

(a)

Ca, Sr and Ba

(b)

Fe, Co, Ni

(c)

Li, Na, K

(d)

CI, Br, I

In the following the element with the highest ionisation energy is _______

(a)

[Ne]3s²3p1

(b)

[Ne]3s²3p³

(c)

[Ne]3s²3p²

(d)

[Ne]3s²3p4

Hydrogen is used in _________

(a)

hydrogenation of oils

(b)

fuel cells

(c)

gas bags for air ships

(d)

all the above

Hydrogen combines with carbon monoxide in the presence of copper catalyst will synthesise _____________

(a)

Ethanol

(b)

Methane

(c)

Methanol

(d)

Methanal

Which of the following non-metal reacts with ordinary water?

(a)

Carbon

(b)

Sulphur

(c)

Chlorine

(d)

Phosphorous

Which of the following is used to remove toxic and heavy metals from water?

(a)

zeolites

(b)

magnesia

(c)

Bleaching agent

(d)

lime

Which one of the following is prepared in industry by the auto-oxidation of 2-alkylanthraquional?

(a)

Heavy water

(b)

Deuterium

(c)

Hydrogen peroxide

(d)

Tritium

Which of the following is the correct order of stability of bonds?

(a)

Hydrogen bond < Covalent bond < Vanderwaals bond

(b)

Vanderwaals bond < Hydrogen bond < Covalent bond

(c)

Vanderwaals bond> Hydrogen bond> Covalent bond

(d)

Covalent bond < Hydrogen bond < Vanderwaals bond