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JEE Mains | PYQ

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Loss of electron from hydrogen atom results in nucleus of \( \sim 1.5 \times 10^{-3} \, \text{pm} \) size.
Reason R: Proton \( \mathrm{(H^+)} \) always exists in combined form.
In the light of the above statements, choose the most appropriate answer from the options given below:

The starting material for convenient preparation of deuterated hydrogen peroxide \( \mathrm{(D_2O_2)} \) in laboratory is:

In which of the following reactions the hydrogen peroxide acts as a reducing agent?

Which hydride among the following is less stable?

Which of the following can reduce decomposition of \( \mathrm{H}_2\mathrm{O}_2 \) on exposure to light?

The strength of \( 50 \) volume solution of hydrogen peroxide is ______ \( \mathrm{g\,/L^{}} \). (Nearest integer)
Given: Molar mass of \( \mathrm{H_2O_2} \) is \( 34 \, \mathrm{g\,mol^{-1}} \)
Molar volume of gas at STP \( = 22.7 \, \mathrm{L} \).

Which of the given compounds can enhance the efficiency of hydrogen storage tank?

Given below are two statements:
Statement-I: Methane and steam passed over a heated Ni catalyst produces hydrogen gas.
Statement-II: Sodium nitrite reacts with \( \mathrm{NH_4Cl} \) to give \( \mathrm{H_2O} \), \( \mathrm{N_2} \) and NaCl.
In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two reactions, involved in the commercial production of dihydrogen \( (\mathrm{H_2}) \).The two reactions are carried out at temperature “\( T_1 \)”, and “\( T_2 \)”, respectively.
\( \mathrm{C(s) + H_2O(g) \xrightarrow{T_1} CO(g) + H_2(g)} \)
\( \mathrm{CO(g) + H_2O(g) \xrightarrow[\text{catalyst}]{T_2} CO_2(g) + H_2(g)} \)
The temperatures \( T_1 \) and \( T_2 \) are correctly related as:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Hydrogen is an environment friendly fuel.
Reason R: Atomic number of hydrogen is \( 1 \) and It is a very light element.
In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Isotopes of hydrogen have almost same chemical properties, but difference in their rates of reaction.
Reason R : Isotopes of hydrogen have different enthalpy of bond dissociation.
In the light of the above statements, choose the most appropriate answer from the options given below :

The water gas on reacting with cobalt as a catalyst forms.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Physical properties of isotopes of hydrogen are different.
Reason R: Mass difference between isotopes of hydrogen is very large.
In the light of the above statements, choose the correct answer from the options given below:

Decreasing order of the hydrogen bonding in following forms of water is correctly represented by
I. Liquid water
II. Ice
III. Impure water
Choose the correct answer from the options given below :

Given below are two statements:
Statement I: \( \mathrm{H_{2}O_{2}} \) is used in the synthesis of Cephalosporin
Statement II: \( \mathrm{H_{2}O_{2}} \) is used for the restoration of aerobic conditions wo sewage wastes.
In the light of the above statement, choose the most appropriate answer from the options given below:

Match List I with List II.

Choose the correct answer from the options given below: