Name the process by which elements such as germanium, silicon and gallium are refined.

(a)

Vapour phase method

(b)

Electrolytic refining

(c)

Zone refining

(d)

Van-Arkel method

Which of the following oxide is amphoteric?

(a)

SiO₂

(b)

CO₂

(c)

SnO₂

(d)

CaO

Pick the wrong one among the following

(a)

F₂ - Yellow

(b)

Br₂ - Red

(c)

Cl₂ - Colourless

(d)

I₂- Violet

Which one of the following exhibits highest oxidation state?

(a)

Ni

(b)

Mn

(c)

V

(d)

Zr

Naming the ligand in [M(en)₂]ⁿ⁺ starts with _______.

(a)

Di

(b)

Bi

(c)

Bis

(d)

any of these

A solid with formula ABC₃ would probably have, _______.

(a)

A at body centre, B at face centres and C at corners of the cube

(b)

A at corners of cube, B at body centre, C at face centre

(c)

A at corners of hexagon, B at centres of the hexagon and C inside the hexagonal unit cell

(d)

A at corner, B at face centre, C at body centre

What would be the activation energy of a reaction when the temperature is increased from 27^oC to 37^oC?

(a)

534 kJ mol^-1

(b)

53.4 kJ mol^-1

(c)

5.34 kJ mol^-1

(d)

None of these

In acidic solution an amino acid, when placed in an electric field__________

(a)

moves towards cathode

(b)

moves towards the anode

(c)

dissociates to cation and anion

(d)

does not move either towards the cathode or anode

The class of drugs used for the treatment of stress is _______

(a)

antihistamine

(b)

tranquilizens

(c)

antimicrobials

(d)

aminoglycosides

Proteins which act as biological catalysts are called ________

(a)

enzymes

(b)

hormones

(c)

vitamins

(d)

polymers