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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:

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to:

On reaction with stronger oxidizing agent like \( \text{KIO}_4 \), hydrogen peroxide oxidizes with the evolution of \( \text{O}_2 \). The oxidation number of \( \text{I} \) in \( \text{KIO}_4 \) changes to _______.

Given below are two statements:
Statement I: Hydrogen peroxide can act as an oxidizing agent in both acidic and basic conditions.
Statement II: Density of hydrogen peroxide at \( 298 \, \text{K} \) is lower than that of \( \mathrm{D_2O} \).
In the light of the above statements, choose the correct answer from the options given below:

Deuterium resembles hydrogen in properties but:

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

Which one of the following statements is incorrect ?

Which hydride among the following is less stable?

Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution?

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 \( = 22.7 \, \mathrm{L} \).

At \( 298.2 \, \text{K} \) the relationship between enthalpy of bond dissociation (in \( \text{kJ mol}^{-1} \)) for hydrogen \(( E_{\mathrm{H}} )\) and its isotope, deuterium, \(( E_{\mathrm{D}} )\), is best described by:

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

The product obtained from the electrolytic oxidation of acidified sulphate solutions, is:

In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?

Dihydrogen reacts with \( \mathrm{CuO} \) to give.

Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?

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:

The highest industrial consumption of molecular hydrogen is to produce compounds of element:

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:

\( \mathrm{BeCl_2} \) reacts with \( \mathrm{LiAlH_4} \) to give:

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 :

Hydrogen has three isotopes: protium (\( {}^{1}\mathrm{H} \)), deuterium (\( {}^{2}\mathrm{H} \)) or \( \mathrm{D} \) and tritium (\( {}^{3}\mathrm{H} \) or \( \mathrm{T} \)). They have nearly same chemical properties but different physical properties. They differ in

The metal slats formed during softening of hardwater using Clark’s method are:

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

Match List-I with List-II

Choose the correct answer from the options given below:

Which of the following statements are correct ?
(A) Both \( \mathrm{LiCl} \) and \( \mathrm{MgCl_2} \) are soluble in ethanol.
(B) The oxides \( \mathrm{Li_2O} \) and \( \mathrm{MgO} \) combine with excess of oxygen to give superoxide.
(C) \( \mathrm{LiF} \) is less soluble in water than other alkali metal fluorides.
(D) \( \mathrm{Li_2O} \) is more soluble in water than other alkali metal oxides.
Choose the most appropriate 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: 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 :

The single largest industrial application of dihydrogen is:

The total number of monobromo derivatives formed by the alkanes with molecular formula \( \mathrm{C_5H_{12}} \) is (excluding stereo isomers) ________.

Given below are two statements:
Statement I: The process of producing syn-gas is called gasification of coal.
Statement II: The composition of syn-gas is \( \mathrm{CO} + \mathrm{CO_2} + \mathrm{H_2} \) \( (1:1:1) \).
In the light of the above statements, choose the most appropriate 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:

Given below are two statements.
Statement I: Stannane is an example of a molecular hydride.
Statement II: Stannane is a planar molecule.
In the light of the above statements choose the most appropriate answer from the options given below:

BeO reacts with HF in presence of ammonia to give [A] which on thermal decomposition produces [B] and ammonium fluoride. Oxidation state of be in [A] is ______.

Two isomers 'A' and 'B' with molecular formula \( \mathrm{C}_4\mathrm{H}_8 \) give different products on oxidation with \( \mathrm{KMnO_4} \) in acidic medium. Isomer 'A' on reaction with \( \mathrm{KMnO_4} / \mathrm{H^+} \) results in effervescence of a gas and gives ketone. The compound 'A' is:

Hydrogen peroxide reacts with iodine in basic medium to give:

The INCORRECT statement(s) about heavy water is (are)
(A) used as a moderator in nuclear reactor
(B) obtained as a by-product in fertilizer industry
(C) used for the study of reaction mechanism
(D) has higher dielectric constant than water
Choose the correct answer from the options given below:

Match List I with List II.

Choose the correct answer from the options given below:

Isotope(s) of hydrogen which emits low energy \( \beta^{-0} \) particles \( t_{1/2} \) value \( > 12 \) years is/are:

Which of the following can be used to prevent the decomposition of \( \mathrm{H_2O_2} \)?

Given below are two statements: One is labeled as Assertion A and the other is labelled as Reason R.
Assertion A: The dihedral angles in \( \mathrm{H_2O_2} \) in gaseous phase is \( 90.2^\circ \) and in solid phase is \( 111.5^\circ \).
Reason R: The change in dihedral angle in solid and gaseous phase is due to the difference in the intermolecular forces.
Choose the most appropriate answer from the options given below for A and R.