Chemistry MCQs

Page No. 95

If a physical and chemical change takes place at a constant pressure then the heat change during the process is called__________________?


aHeat of transition


bHeat of fusion


cEnthalpy change


dAll of the above


View Answer Enthalpy change

The number amino acid units for each turn of helix on average are____________________?


a21


b23


c25


d27


View Answer 27

Which solids are called true solids _______________?


aMetallic


bAmorphous


cCrystalline


dVitreous


View Answer Crystalline

The viscosity of solids is________________?


aInfinite


bNegligible


cMedium


dNo concept of viscosity in solid


View Answer Infinite

Crystalline solids can be identified easily from their ___________________?


aSharp melting point


bDefinite geometry


cTransition temperature


dColour


View Answer Sharp melting point

A malleable solid is one which can be_________________?


aConverted into wires


bConverted into thin sheets


cMelted easily


dAll of the above



Crystallites are present in_________________?


acrystalline solids


bamorphous solids


cliquid crystals


dall of the above


View Answer amorphous solids

Molar heat of vaporization of water is_________________?


a40.7 KJ/mole


b40.7 J/mole


c40.7 cal/mole


d40.7 Kcal/mole


View Answer 40.7 KJ/mole

Liquid gets the shape of the container when it is poured into it. Which one of the following reasons justifies it ?


aLiquid do not have definite shape


bLiquid do not have definite volume


cLiquid is highly compressible


dLiquid molecules can slide over each other



The number of formula units in 29.25g of common salt_________________?


a6.022 x 1023


b3.01 x 1023


c2 x NA


d4 x 6.022 x 1023


View Answer 3.01 x 1023

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