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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