JEE Main 2021 (Online) 26th August Evening Shift | Hydrogen Question 38 | Chemistry

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Heavy water is used for the study of reaction mechanism.

Reason (R) : The rate of reaction for the cleavage of O - H bond is slower than that of O - D bond.

Choose the most appropriate answer from the options given below :

Both (A) and (R) are true but (R) is not the true explanation of (A).

Both (A) and (R) are true and (R) is the true explanation of (A).

(A) is false but (R) is true.

(A) is true but (R) is false.

JEE Main 2021 (Online) 26th August Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which one of the following methods is most suitable for preparing deionized water?

Synthetic resin method

Clark's method

Calgon's method

Permutit method

JEE Main 2021 (Online) 27th July Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is :

1 and 1

3 and 1

2 and 1

2 and 2

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

At 298.2 K the relationship between enthalpy of bond dissociation (in kJ mol^$$-$$1) for hydrogen (E_H) and its isotope, deuterium (E_D), is best described by :

$${E_H} = {1 \over 2}{E_D}$$

$${E_H} = {E_D}$$

$${E_H} \simeq {E_D} - 7.5$$

$${E_H} = 2{E_D}$$

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