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Standard IX

Chemistry

Sublimation

Assertion :Ai...

Question

Assertion :Air is a good conductor of heat Reason: It's molecules are in close contact with each other

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Correct reason is that air is a gas and its molecules are far apart from each other. So, this is not a good condition for conduction. Also air being a non metal, doesn't have free electrons for conduction.

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Similar questions

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

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Assertion :Air is a good conductor of heat Reason: It's molecules are in close contact with each other

The correct option is D Both Assertion and Reason are incorrectCorrect reason is that air is a gas and its molecules are far apart from each other. So, this is not a good condition for conduction. Also air being a non metal, doesn't have free electrons for conduction.

The correct option is D Both Assertion and Reason are incorrect
Correct reason is that air is a gas and its molecules are far apart from each other. So, this is not a good condition for conduction. Also air being a non metal, doesn't have free electrons for conduction.