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Standard XII
Chemistry
Question

Assertion :We are able to sip hot tea faster from a saucer than from a cup. Reason: Saucer is having more surface area than a cup, as we know that evaporation is the surface phenomenon. so, the rate of evaporation will increase with the increase in surface area.
  1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  3. Assertion is correct but Reason is incorrect
  4. Both Assertion and Reason are incorrect

A
Assertion is correct but Reason is incorrect
B
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
C
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
D
Both Assertion and Reason are incorrect
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Solution
Verified by Toppr

Saucer is having more surface area than a cup, as we know that evaporation is the surface phenomenon. so, the rate of evaporation will increase with the increase in surface area. Hence, it is easy to sip hot tea or milk faster from a saucer rather than a cup.

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Q1
Assertion :We are able to sip hot tea faster from a saucer than from a cup. Reason: Saucer is having more surface area than a cup, as we know that evaporation is the surface phenomenon. so, the rate of evaporation will increase with the increase in surface area.
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Q2

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(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.

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Q4
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If BOD level of water in reservoir is less than 5 ppm it is not polluted.

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High biological oxygen demand means low activity of bacteria in water.
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Q5

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.

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