Chemistry MCQs

Page No. 33

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


adecrease

✖


bincrease

✓


cRemains constant

✖


dfirst decreases then increases

✖


View Answer increase

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


ametal borate

✖


bmetal meta borate

✓


cmetal boride

✖


dmetal silicate

✖


View Answer metal meta borate

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


ait has small size

✖


bit has high nuclear charge

✖


cit forms molecular addition compounds

✖


dall of the above

✓


View Answer all of the above

Silicon differ from silica by a group of__________________?


aCH3

✓


bOH

✖


cOCH3

✖


dO2

✖


View Answer CH3

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


aAs nitrometer

✖


bTo remove air bubbles from molten metal

✓


cTo produce alloy

✖


dAs insulator

✖



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


a26%

✖


b27%

✖


c37%

✓


d<2.6%

✖


View Answer 37%

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


a4

✓


b2

✖


c1

✖


d6

✖


View Answer 4

Which electronic configuration corresponds to an element of group IIIA ?


a1s2 2s2 2p3

✖


b1s2 2s2 2p6 3s2 3p1

✓


c1s2 2s2 2p4

✖


d1s2 2s2 2p6 3s2 3p6 4s2 3d1

✖


View Answer 1s2 2s2 2p6 3s2 3p1

Aluminium oxide is_________________?


aAcidic oxide

✖


bBasic oxide

✖


cAmphoteric oxide

✓


dIt does not exists

✖


View Answer Amphoteric oxide

Special features of borate glass is that it is_________________?


aHeat resistant

✓


bLow melting

✖


cUsed to prepare chemical garden

✖


dGreen in colour

✖


View Answer Heat resistant

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