Hydrogen PYQs - Last 5 Years

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 : Loss of electron from hydrogen atom results in nucleus of \(\sim 1.5 \times 10^{-3} \mathrm{pm}\) size.
Reason R : Proton $$...

\(\mathrm{H}_{2} \mathrm{O}_{2}\) acts as a reducing agent in :

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 normal rain water is slightly acidic and its $\mathrm{pH}$ value is $5.6$ because of which one of the following?

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

Match List I with List II

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

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 l...

The starting material for convenient preparation of deuterated hydrogen peroxide (\(\mathrm{D_{2}O_{2}}\)) in :

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 ...

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...

Match List I with List II

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Given below are two statements:
Statement-I : Methane and steam passed over a heated \(\mathrm{Ni}\) catalyst produces hydrogen gas.
Statement-II : Sodium nitrite reacts with \(\mathrm{NH}_{4} \mathrm{Cl}\) to give $$\mathrm{H}_{2} \mathrm{...

Which hydride among the following is less stable?

Given below are two reactions, involved in the commercial production of dihydrogen (H\(_2\)). The two reactions are carried out at temperature "T\(_1\)" and "T\(_2\)", respectively
$$C(s) + {H_2}O(g)\buildrel {{T_1}} \over
\longrightarrow ...

Given below are two statements: one is labelled as Assertion \(\mathbf{A}\) and the other is labelled as Reason \(\mathbf{R}\)
Assertion A : Physical properties of isotopes of hydrogen are different.
Reason R : Mass difference between isoto...

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

Dihydrogen reacts with CuO to give :

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

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

On reaction with stronger oxidizing agent like \(\mathrm{KIO}_{4}\), hydrogen peroxide oxidizes with the evolution of \(\mathrm{O}_{2}\). The oxidation number of \(\mathrm{I}\) in \(\mathrm{KIO}_{4}\) changes to __________.

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 \(298 \mathrm{~K}\) is lower than that of $$\mathrm{D}_{2} \ma...

The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is ____________.

Consider the following reaction:
\(2HSO_4^ - (aq)\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{(2)\,Hydrolysis}^{(1)\,Electrolysis}} 2HSO_4^ - + 2{H^ + } + A\)
The dihedral angle in product A in its solid phase at 110 K is :

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

Which of the following can be used to prevent the decomposition of \(\mathrm{H}_{2} \mathrm{O}_{2}\) ?

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

The reaction of \(\mathrm{H}_{2} \mathrm{O}_{2}\) with potassium permanganate in acidic medium leads to the formation of mainly :

High purity (> 99.95%) dihydrogen is obtained by :

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

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 CO + CO2 + H2 (1 : 1 : 1)In the light of the above statements, choose the most approp...

Which one of the following statements is incorrect?

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

Deuterium resembles hydrogen in properties but :

The oxide that gives H2O2 most readily on treatment with H2O is :

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 ord...

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 O - H bo...

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

Which of the following equation depicts the oxidizing nature of H2O2?

Water does not produce CO on reacting with :

(A) HOCI + H2O2 → H3O+ + Cl- + O2
(B) I2 + H2O2 + 2OH- → 2I- + 2H2O + O2
Choose the correct option.

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 : Hyd...

The water having more dissolved O2 is :

Given below are two statements : One is labelled as Assertion A and other is labelled as Reason R. Assertion A : The dihedral angles in H2O2 in gaseous phase is 90.2\(^\circ\) and in solid phase is 111.5\(^\circ\).Reason R : The change in d...

The single largest industrial application of dihydrogen is :

Hydrogen peroxide reacts with iodine in basic medium to give :

In basic medium, H2O2 exhibits which of the following reactions?(A) Mn2+ \(\to\) Mn4+(B) I2 \(\to\) I\(-\)(C) PbS \(\to\) PbSO4Choose the most appropriate answer from the options given below :