Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of

Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of

A

Sublimation

B

Fusion

C

Transition

D

Vaporisation

. Diamond is an allotropic form of

A

germanium

B

carbon

C

silicon

D

sulphur

The most stable allotropic form of phosphorous is the __________ phosphorous.

A

White

B

Black

C

Yellow

D

Red

The most reactive allotropic form of phosphorus is __________ phosphorus.

A

Red

B

Yellow

C

Violet

D

Black

For the allotropic forms of iron, the points of arrest are

A

The points where no further change occurs

B

Constant for all metals

C

The points where there is no further flow of metal

D

The points of discontinuity

A material is said to be allotropic, if it has

A

Fixed structure at all temperatures

B

Atoms distributed in random pattern

C

Different crystal structures at different temperatures

D

Any one of the above

A material is known as allotropic or polymorphic if it

A

Has a fixed structure under all conditions

B

Exists in several crystal forms at different temperatures

C

Responds to heat treatment

D

Has its atoms distributed in a random pattern

Which of the following represents the allotropic forms of iron?

A

Alpha iron, beta iron and gamma iron

B

Alpha iron and beta iron

C

Body centered cubic iron and face centered cubic iron

D

Alpha iron, gamma from and delta iron

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then

A

$${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months

B

It will completely disintegrate in two months

C

It will completely disintegrate in four months

D

$${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months

In which form is the supplied heat energy stored during change in temperature of substance?

A

Heat energy

B

Kinetic energy

C

Potential energy

D

Both kinetic and potential energy

Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of

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