The metal which is used in thermite process because of its activity is____________________?

A. Iron
B. Copper
C. Aluminium
D. Zinc

Which of the following shows inert pair effect ?

A. Boron
B. Carbon
C. Silicon
D. Tin

Tincal is a mineral of___________________?

A. A1
B. Si
C. B
D. C

In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of osygen?

A. 4
B. 2
C. 1
D. 6

Orthoboric acid is 2.6% soluble in water at 40?C and ___________at 107°C.

A. 26%
B. 27%
C. 37%
D. <2.6%

Because of its ability to combine with both oxygen and nitrogen aluminium metal is used_____________?

A. As nitrometer
B. To remove air bubbles from molten metal
C. To produce alloy
D. As insulator

Silicon differ from silica by a group of__________________?

A. Ch3
B. Oh
C. Och3
D. O2

Boron is non metal while other elements of IIIA group are metals. This is because______________?

A. It has small size
B. It has high nuclear charge
C. It forms molecular addition compounds
D. All of the above

The coloured glassy mass in borax bead test is due to the formation of___________________?

A. Metal borate
B. Metal meta borate
C. Metal boride
D. Metal silicate

If temperature of gallium arsenide is increased then its conductivity will___________________?

A. Decrease
B. Increase
C. Remains constant
D. First decreases then increases