Assertion :Hydrides of group-16 elements show volatility in the order : $H_{2} O > H_{2} S > H_{2} S e > H_{2} T e$ Reason: Electronegativity of group-16 elements increases down the group from oxygen to tellurium.

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
Hydrides of group-16 elements show volatility in the order: $H_{2} S > H_{2} S e > H_{2} T e > H_{2} O$
Electronegativity of group-16 elements decreases down the group from oxygen to tellurium.
Oxygen is more electronegative than other elements of group-16. Hence, water shows hydrogen bonding and shows the lowest volatility. As the size of the atom increases regularly from sulphur to tellurium, van der Waal's forces of attraction increase and hence volatility decreases from $H_{2} S$ to $H_{2} T e$ .

Both Assertion and Reason are incorrect.

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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) IUPAC name of the compund
$C H_{3} - C H | C H_{3} - O - C H_{2} - C H_{2} - C H_{3}$ is 2-ethoxy-2-methylethane
Reason (R) In IUPAC nomenclature, ether is regarded as hydrocarbon derivative in which a hydrogen atom is replaced by - OR or - 0AR group [where, R = alkyl group and Ar = aryl group].
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(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q. Assertion : In the bonding molecular orbital (MO) of

H_{2}

, the electron density is increased between the nuclei.
Reason : The bonding MO is

ψ_{A} + ψ_{B}

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Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc. $H N O_{3} a n d H_{2} S O_{4}$ mixture.
Reason (R) - OH group in phenol is o-,p-directing.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
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Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
High biological oxygen demand means low activity of bacteria in water.

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Assertion :Hydrides of group-16 elements show volatility in the order : H2O>H2S>H2Se>H2Te Reason: Electronegativity of group-16 elements increases down the group from oxygen to tellurium.

Assertion :Hydrides of group-16 elements show volatility in the order : $H_{2} O > H_{2} S > H_{2} S e > H_{2} T e$ Reason: Electronegativity of group-16 elements increases down the group from oxygen to tellurium.