Hydrogen · Chemistry · JEE Main
MCQ (Single Correct Answer)
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:
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 the most appropriate answer from the options given below:
Match List I with List II
| LIST I Type of Hydride |
LIST II Example |
||
|---|---|---|---|
| A. | Electron deficient hydride | I. | $$\mathrm{MgH_2}$$ |
| B. | Electron rich hydride | II. | $$\mathrm{HF}$$ |
| C. | Electron precise hydride | III. | $$\mathrm{B_2H_6}$$ |
| D. | Saline hydride | IV. | $$\mathrm{CH_4}$$ |
Choose the correct answer from the options given below:
Which hydride among the following is less stable?
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 $$\mathrm{H}_{2} \mathrm{O}, \mathrm{N}_{2}$$ and $$\mathrm{NaCl}$$.
In the light of the above statements, choose the most appropriate answer from the options given below :
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 isotopes of hydrogen is very large.
In the light of the above statements, choose the correct answer from the options given below:
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
$$C(s) + {H_2}O(g)\buildrel {{T_1}} \over \longrightarrow CO(g) + {H_2}(g)$$
$$CO(g) + {H_2}O(g)\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{Catalyst}^{{T_2}}} C{O_2}(g) + {H_2}(g)$$
The temperatures T$$_1$$ and T$$_2$$ are correctly related as :
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 $$\left(\mathrm{H}^{+}\right)$$ 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 ($$\mathrm{D_{2}O_{2}}$$) in :
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 :
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 most appropriate answer from the options given below :
$$\mathrm{H}_{2} \mathrm{O}_{2}$$ acts as a reducing agent in :
Which of the given compounds can enhance the efficiency of hydrogen storage tank?
Match List I with List II
| List I | List II | ||
|---|---|---|---|
| A. | Cobalt catalyst | I. | $$\mathrm{(H_2+Cl_2)}$$ production |
| B. | Syngas | II. | Water gas production |
| C. | Nickel catalyst | III. | Coal gasification |
| D. | Brine solution | IV. | Methanol production |
Choose the correct answer from the options given below :
In which of the following reactions the hydrogen peroxide acts as a reducing agent?
The products obtained during treatment of hard water using Clark's method are :
The metal salts formed during softening of hardwater 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 $$\mathrm{D}_{2} \mathrm{O}$$.
In the light of the above statements, choose the correct answer from the options given below.
Which of the following can be used to prevent the decomposition of $$\mathrm{H}_{2} \mathrm{O}_{2}$$ ?
High purity (> 99.95%) dihydrogen is obtained by :
The reaction of $$\mathrm{H}_{2} \mathrm{O}_{2}$$ with potassium permanganate in acidic medium leads to the formation of mainly :
Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?
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 :
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 :
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 :
The highest industrial consumption of molecular hydrogen is to produce compounds of element :
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 appropriate answer from the options given below :
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 :
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 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.
(A) Mn2+ $$ \to $$ Mn4+
(B) I2 $$ \to $$ I$$-$$
(C) PbS $$ \to $$ PbSO4
Choose the most appropriate answer from the options given below :
(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 a higher dielectric constant than water
Choose the correct answer from the options given below :
(A) used in the treatment of effluents.
(B) used as both oxidising and reducing agents.
(C) the two hydroxyl groups lie in the same plane.
(D) miscible with water.
Choose the correct answer from the options given below :
Statement I : H2O2 can act as both oxidising and reducing agent in basic medium.
Statement II : In the hydrogen economy, the energy is transmitted in the form of dihydrogen.
In the light of the above statements, choose the correct answer from the options 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 H2O is greater than D2O.
Choose the most appropriate answer from the options given below :
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 light of the above statements, choose the correct answer from the options given below :
(B) I2 + H2O2 + 2OH- → 2I- + 2H2O + O2
Choose the correct option.
(a) Decomposition of hydrogen peroxide gives dioxygen.
(b) Like hydrogen peroxide, compounds, such as KCIO3, Pb(NO3)2 and NaNO3 when heated liberate dioxygen.
(c) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide.
(d) Hydrogen peroxide is used for the manufacture of sodium perborate.
(a) saline hydrides produce H2 gas when reacted with H2O.
(b) reaction of LiAlH4 with BF3 leads to B2H6.
(c) PH3 and CH4 are electron - rich and electron - precise hydrides, respectively.
(d) HF and CH4 are called as molecular
(a) It produces less pollutants than petrol.
(b) A cylinder of compressed dihydrogen weighs $$ \sim $$ 30 times more than a petrol tank producing the same amount of energy.
(c) Dihydrogen is stored in tanks of metal alloys like NaNi5.
(d) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 KJ, respectively.
Numerical
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 oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is ____________.