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

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bHeat of fusion

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cEnthalpy change

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dAll of the above

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View Answer Enthalpy change

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


a21

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b23

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c25

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d27

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View Answer 27

Which solids are called true solids _______________?


aMetallic

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bAmorphous

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cCrystalline

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dVitreous

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View Answer Crystalline

The viscosity of solids is________________?


aInfinite

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bNegligible

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cMedium

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dNo concept of viscosity in solid

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View Answer Infinite

Crystalline solids can be identified easily from their ___________________?


aSharp melting point

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bDefinite geometry

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cTransition temperature

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dColour

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View Answer Sharp melting point

A malleable solid is one which can be_________________?


aConverted into wires

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bConverted into thin sheets

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cMelted easily

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dAll of the above

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Crystallites are present in_________________?


acrystalline solids

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bamorphous solids

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cliquid crystals

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dall of the above

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View Answer amorphous solids

Molar heat of vaporization of water is_________________?


a40.7 KJ/mole

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b40.7 J/mole

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c40.7 cal/mole

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d40.7 Kcal/mole

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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

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bLiquid do not have definite volume

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cLiquid is highly compressible

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dLiquid molecules can slide over each other

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


a6.022 x 1023

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b3.01 x 1023

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c2 x NA

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d4 x 6.022 x 1023

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View Answer 3.01 x 1023

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