Hydrogen — JEE Main PYQs

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

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 …

Given below are two reactions, involved in the commercial production of dihydrogen $({\mathrm{H}}_2)$.
The two reactions are carried out at temperature "${\mathrm{T}}_1$" and "${\mathrm{T}}_2$" respectively …

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 ${\mathrm{NH}}_4\mathrm{Cl}$ to give ${\mathrm{H}}_2\mathrm{O},{\mathrm{N}}_2$ and NaCl .
In the light of the …

Which hydride among the following is less stable?

Given below are two statements:

Statement-I Permutit process is more efficient compared to the synthetic resin method for the softening of water.
Statement-II: Synthetic resin method results in the formation of soluble sodium salts.

In the light of the above statements, choose …

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 bon …

During water-gas shift reaction

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 co …

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

'25 volume' hydrogen peroxide means

Match List I with List II

Choose t …

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

Given below are two statements:
Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats.
Statement II : Silicon forms both electron rich and electron deficient hydrides.
In the light of the above statements, choose the most appropriate answer from …

Lithium aluminium hydride can be prepared from the reaction of

The starting material for convenient preparation of deuterated hydrogen peroxide (${\mathrm{D}}_2{\mathrm{O}}_2$) in laboratory is:

Given below are two statements :

Statement I: ${\mathrm{H}}_2{\mathrm{O}}_2$ is used in the synthesis of Cephalosporin
Statement II : ${\mathrm{H}}_2{\mathrm{O}}_2$ is used for the restoration of aerobic conditions to sewage wastes.
In the light of the above statements, choose …

The strength of 50 volume solution of hydrogen peroxide is ______ $\mathrm{g}/\mathrm{L}$ (Nearest integer).

Given:
Molar mass of ${\mathrm{H}}_2{\mathrm{O}}_2$ is $34{\mathrm{g}\mathrm{mol}}^{-1}$
Molar volume of gas at STP = $22.7\mathrm{L}$.

${\mathrm{H}}_2{\mathrm{O}}_2$ acts as a reducing agent in

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 statement, choose the most appropriate answer from the options given below :

The metal salts formed during softening of hardwater using Clark's method are :

The products obtained during treatment of hard water using Clark's method are:

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 K is lower than that of $\mathrm{D}{}_2\mathrm{O}$.

In the light of the above statements. Choose the correct an …

The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are

High purity (>99.95%) dihydrogen is obtained by

Which of the following can be used to prevent the decomposition of H₂O₂?

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

Dihydrogen reacts with CuO to give

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

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

Consider the following reaction :


The dihedral angle in product $\mathbf{A}$ in its solid phase at 110 K is :

The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives:

(A) $\mathrm{HOCl}+{\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{H}}_3{\mathrm{O}}^{+}+{\mathrm{Cl}}^{-}+{\mathrm{O}}_2$
(B) ${\mathrm{I}}_2+{\mathrm{H}}_2{\mathrm{O}}_2+2{\mathrm{OH}}^{-}\to 2{\mathrm{I}}^{-}+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$

Choose the …

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

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 $\mathrm{O}-\mathrm{H}$ bond is slower than that …

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Hydrogen is the most abundant element in the Universe, but it is not the most abundant gas in the troposphere.
Reason R: Hydrogen is the lightest element
In the li …

The single largest industrial application of dihydrogen is:

The oxide that gives ${\mathrm{H}}_2{\mathrm{O}}_2$ most readily on treatment with ${\mathrm{H}}_2\mathrm{O}$ is :

Which of the following equation depicts the oxidizing nature of ${\mathrm{H}}_2{\mathrm{O}}_2$ ?

Isotope(s) of hydrogen which emits low energy ${\beta }^{-}$ particles with ${\mathrm{t}}_{1/2}$ value $>12$ years is/are:

Statements about heavy water are given below :
(A) Heavy water is used in exchange reactions for the study of reaction mechanisms.
(B) Heavy water is prepared by exhaustive electrolysis of water
(C) Heavy water has higher boiling point than ordinary water.
(D) Viscosity of …

Deuterium resembles hydrogen in properties but :

Which of the following forms of hydrogen emits low energy $\beta$- particles ?

Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?

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 ans …

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

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

Which one of the following metals forms interstitial hydride easily?

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

Hydrogen peroxide reacts with iodine in basic medium to give: