JEE Main
Chemistry
Hydrogen
Previous Years Questions

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 ...
The normal rain water is slightly acidic and its $\mathrm{pH}$ value is $5.6$ because of which one of the following ?
Given below are two statements : Statement I : $\mathrm{H}_{2} \mathrm{O}_{2}$ is used in the synthesis of Cephalosporin Statement II : $\mathrm{H}_... $$\mathrm{H}_{2} \mathrm{O}_{2}$$ acts as a reducing agent in Which of the given compounds can enhance the efficiency of hydrogen storage tank? 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: Densit... The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are 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 physica... 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: $$2HSO_4^ - (aq)\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{(2)\,Hydrolysis}^{(1)\,Electrolysis}} 2HSO_4^ - +... The highest industrial consumption of molecular hydrogen is to produce compounds of element : Hydrogen peroxide reacts with iodine in basic medium to give : Which one of the following statements is incorrect? The oxide that gives H2O2 most readily on treatment with H2O is : Deuterium resembles hydrogen in properties but : Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Heavy water is used for the ... Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere? Which one of the following methods is most suitable for preparing deionized water? The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is : To an aqueous solution containing ions such as Al3+, Zn2+, Ca2+, Fe3+, Ni2+, Ba2+ and Cu2+ was added conc. HCl, followed by H2S.The total number of ca... At 298.2 K the relationship between enthalpy of bond dissociation (in kJ mol$$-$$1) for hydrogen (EH) and its isotope, deuterium (ED), is best describ... The water having more dissolved O2 is : The single largest industrial application of dihydrogen is : Given below are two statements : One is labelled as Assertion A and other is labelled as Reason R. Assertion A : The dihedral angles in H2O2 in gaseou... In basic medium, H2O2 exhibits which of the following reactions?(A) Mn2+$$ \to $$Mn4+(B) I2$$ \to $$I$$-$$(C) PbS$$ \to $$PbSO4Choose the most a... Given below are two statements : One is labelled as Assertion A and the other labelled as reason RAssertion A : During the boiling of water having tem... The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are : 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) ... The correct statements about H2O2 are :(A) used in the treatment of effluents.(B) used as both oxidising and reducing agents.(C) the two hydroxyl grou... Given below are two statements :Statement I : H2O2 can act as both oxidising and reducing agent in basic medium.Statement II : In the hydrogen economy... 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 prep... 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.... Dihydrogen of high purity (> 99.95%) is obtained through : Hydrogen peroxide, in the pure state, is : The one that is NOT suitable for the removal of permanent hardness of water is : The equation that represents the water-gas shift reaction is : If the boiling point of H2O is 373 K, the boiling point of H2S will be : Amongst the following, the form of water with the lowest ionic conductance at 298 K is: Among the statements (a) - (d), the correct ones are : (a) Decomposition of hydrogen peroxide gives dioxygen. (b) Like hydrogen peroxide, compounds, s... In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is : The temporary hardness of a water sample is due to compound X. Boiling this sample converts X to compound Y. X and Y, respectively, are : The metal that gives hydrogen gas upon treatment with both acid as well as base is : The correct statements among (a) to (d) are : (a) saline hydrides produce H2 gas when reacted with H2O. (b) reaction of LiAlH4 with BF3 leads to B2H6.... The synonym for water gas when used in the production of methanol is : The number of water molecule(s) not coordinated to copper ion directly in CuSO4.5H2O, is : The strength of 11.2 volume solution of H2O2 is : [Given that molar mass of H = 1 g mol–1 and O = 16 g mol–1] 100 mL of a water sample contains 0.81 g of calcium bicrabonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in te... The volume strength of 1M H2O2 is (Molar mass of H2O2 = 34 g mol–1) The hardness of a water sample (in terms of equivalents of CaCO3) containing 10–3 M CaSO4 is (Molar mass of CaSO4 = 136 g mol–1) ... The correct statements among (a) to (d) regarding H2 as a fuel are : (a) It produces less pollutants than petrol. (b) &nbs... NaH is an example of : The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are : The chemical nature of hydrogen peroxide is : The temporary hardness of water is due to : The isotopes of hydrogen are : Hydrogen peroxide oxidises [Fe(CN)6]4- to [Fe(CN)6]3- in acidic medium but reduces [Fe(CN)6]3- to [Fe(CN)6]4- in alkaline medium. The other products f... Identify the reaction which does not liberate hydrogen : Identify the incorrect statement regarding heavy water : Which one of the following statements about water is FALSE? The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na (Mol. Wt. 206). What would be the maximum uptake ... From the following statements regarding H2O2, choose the incorrect statement: Very pure hydrogen (99.9%) can be made by which of the following processes ? In context with the industrial preparation of hydrogen from water gas (CO + H2), which of the following is the correct statement? Which one of the following process will produce hard water? ## Numerical On reaction with stronger oxidizing agent like$$\mathrm{KIO}_{4}$$, hydrogen peroxide oxidizes with the evolution of$$\mathrm{O}_{2}$\$. The oxidati...
The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is ____________...
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