Entry Test MCQ :: Group III A and IVA Elements

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11.

Which electronic configuration corresponds to an element of group IIIA?

A.	1s2 2s2 2p3	B.	1s2 2s2 2p6 3s2 3p1
C.	1s2 2s2 2p4	D.	1s2 2s2 2p6 3s2 3p6 4s2 3d1

12.

Tincal is a mineral of

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

13.

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

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

14.

Which one of the following is not a semiconductor?

A.	Si	B.	Ge
C.	Se	D.	Sn

15.

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

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

16.

The process of aluminium extraction is called

A.	Hall process	B.	Thermite process
C.	Haber process	D.	Contact process

17.

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

18.

Aqueous solution of borax above 62?C gives crystals of

A.	Na2B4O7.4H2O	B.	Na2B4O7.5H2O
C.	Na2B4O7.2H2O	D.	Na2B4O7.10H2O

19.

Silicon differ from silica by a group of

A.	Ch3	B.	?OH
C.	OCH3	D.	O2

20.

Which of the following is not a use of silicon?

A.	Lubricants	B.	Hydraulic brakes
C.	Antifreeze	D.	Water repellent