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Hydrogen

87 Questions
All Exams JEE Mains JEE Advanced TS-EAMCET AP-EAPCET
2021 JEE Mains MCQ
JEE Main 2021 (Online) 25th February Evening Shift
Water does not produce CO on reacting with :
A.
C
B.
CH4
C.
C3H8
D.
CO2
2021 JEE Mains MCQ
JEE Main 2021 (Online) 25th February Morning Shift
Which of the following equation depicts the oxidizing nature of H2O2?
A.
$C{l_2} + {H_2}{O_2} \to 2HCl + {O_2}$
B.
$KI{O_4} + {H_2}{O_2} \to KI{O_3} + {H_2}O + {O_2}$
C.
$2{I^ - } + {H_2}{O_2} + 2{H^ + } \to {I_2} + 2{H_2}O$
D.
${I_2} + {H_2}{O_2} + 2O{H^ - } \to 2{I^ - } + 2{H_2}O + {O_2}$
2021 JEE Mains MCQ
JEE Main 2021 (Online) 24th February Evening Shift
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 light of the above statements, choose the correct answer from the options given below :
A.
Both A and R are true but R is NOT the correct explanation of A
B.
Both A and R are true and R is the correct explanation of A
C.
A is true but R is false
D.
A is false but R is true.
2021 JEE Mains MCQ
JEE Main 2021 (Online) 24th February Morning Shift
(A) HOCI + H2O2 → H3O+ + Cl- + O2

(B) I2 + H2O2 + 2OH- → 2I- + 2H2O + O2

Choose the correct option.
A.
H2O2 acts as reducing and oxidising agent respectively in equations (A) and (B).
B.
H2O2 act as oxidizing and reducing agent respectively in equations (A) and (B).
C.
H2O2 acts as oxidising agent in equations (A) and (B).
D.
H2O2 acts as reducing agent in equations (A) and (B).
2020 JEE Mains MCQ
JEE Main 2020 (Online) 6th September Evening Slot
Dihydrogen of high purity (> 99.95%) is obtained through :
A.
the electrolysis of acidified water using Pt electrodes
B.
the electrolysis of warm Ba(OH)2 solution using Ni electrodes
C.
the electrolysis of brine solution
D.
the reaction of Zn with dilute HCl
2020 JEE Mains MCQ
JEE Main 2020 (Online) 5th September Evening Slot
The one that is NOT suitable for the removal of permanent hardness of water is :
A.
Ion-exchange method
B.
Calgon's method
C.
Treatment with sodium carbonate
D.
Clark's method
2020 JEE Mains MCQ
JEE Main 2020 (Online) 5th September Evening Slot
Hydrogen peroxide, in the pure state, is :
A.
Linear and blue in color
B.
Linear and almost colorless
C.
Non-planar and almost colorless
D.
Planar and bluein color
2020 JEE Mains MCQ
JEE Main 2020 (Online) 5th September Morning Slot
The equation that represents the water-gas shift reaction is :
A.
CO(g) + H2O(g) $\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{Catalyst}^{673K}} $ CO2(g) + H2(g)
B.
CH4(g) + H2O(g) $\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{Ni}^{1270K}} $ CO(g) + 3H2(g)
C.
C(s) + H2O(g) $\buildrel {1270K} \over \longrightarrow $ CO(g) + H2(g)
D.
2C(s) + O2(g) + 4N2(g) $\buildrel {1273K} \over \longrightarrow $ 2CO(g) + 4N2(g)
2020 JEE Mains MCQ
JEE Main 2020 (Online) 3rd September Morning Slot
If the boiling point of H2O is 373 K, the boiling point of H2S will be :
A.
greater than 300 K but less than 373 K
B.
equal to 373 K
C.
more than 373 K
D.
less than 300 K
2020 JEE Mains MCQ
JEE Main 2020 (Online) 9th January Evening Slot
Amongst the following, the form of water with the lowest ionic conductance at 298 K is :
A.
saline water used for intravenous injection
B.
sea water
C.
distilled water
D.
water from a well
2020 JEE Mains MCQ
JEE Main 2020 (Online) 7th January Evening Slot
Among the statements (a) - (d), the correct ones are :
(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.
(a), (b), (c) and (d)
B.
(a) and (c) only
C.
(a), (b) and (c) only
D.
(a), (c) and (d) only
2020 JEE Mains MCQ
JEE Main 2020 (Online) 7th January Morning Slot
In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is :
A.
less efficient as the resins cannot be regenerated.
B.
more efficient as it can exchange only cations.
C.
more efficient as it can exchange both cations as well as anions.
D.
less efficient as it exchanges only anions.
2019 JEE Mains MCQ
JEE Main 2019 (Online) 12th April Evening Slot
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 :
A.
Mg(HCO3)2 and MgCO3
B.
Ca(HO3)2 and CaO
C.
Ca(HCO3)2 and Ca(OH)2
D.
Mg(HCO3)2 and Mg(OH)2
2019 JEE Mains MCQ
JEE Main 2019 (Online) 12th April Morning Slot
The metal that gives hydrogen gas upon treatment with both acid as well as base is :
A.
mercury
B.
zinc
C.
iron
D.
magnesium
2019 JEE Mains MCQ
JEE Main 2019 (Online) 10th April Evening Slot
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.
(c) PH3 and CH4 are electron - rich and electron - precise hydrides, respectively.
(d) HF and CH4 are called as molecular
A.
(a), (b), (c) and (d)
B.
(a), (c) and (d) only
C.
(c) and (d) only
D.
(a), (b) and (c) only
2019 JEE Mains MCQ
JEE Main 2019 (Online) 10th April Morning Slot
The synonym for water gas when used in the production of methanol is :
A.
fuel gas
B.
laughing gas
C.
syn gas
D.
natural gas
2019 JEE Mains MCQ
JEE Main 2019 (Online) 9th April Morning Slot
The number of water molecule(s) not coordinated to copper ion directly in CuSO4.5H2O, is :
A.
2
B.
4
C.
3
D.
1
2019 JEE Mains MCQ
JEE Main 2019 (Online) 8th April Evening Slot
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]
A.
3.4%
B.
34%
C.
13.6%
D.
1.7%
2019 JEE Mains MCQ
JEE Main 2019 (Online) 8th April Morning Slot
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 terms of equivalents of CaCO3 is : (Molar mass of calcium bicarbonate is 162 g mol–1 and magnesium bicarbonate is 146 g mol–1)
A.
1,000 ppm
B.
100 ppm
C.
10,000 ppm
D.
5,000 ppm
2019 JEE Mains MCQ
JEE Main 2019 (Online) 12th January Evening Slot
The volume strength of 1M H2O2 is : (Molar mass of H2O2 = 34 g mol–1)
A.
5.6
B.
22.4
C.
11.35
D.
16.8
2019 JEE Mains MCQ
JEE Main 2019 (Online) 11th January Morning Slot
NaH is an example of :
A.
metallic hydride
B.
saline hydride
C.
electron-rich hydrid
D.
molecular hydride
2019 JEE Mains MCQ
JEE Main 2019 (Online) 11th January Morning Slot
The correct statements among (a) to (d) regarding H2 as a fuel are :

(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.
A.
(a) and (c) only
B.
(b) and (d) only
C.
(a), (b) and (c) only
D.
(b), (c) and (d) only
2019 JEE Mains MCQ
JEE Main 2019 (Online) 10th January Morning Slot
The chemical nature of hydrogen peroxide is :
A.
Oxidising agent in acidic medium, but not in basic medium
B.
Oxidising and reducing agent in both acidic and basic medium
C.
Reducing agent in basic medium, but not in acidic medium
D.
Oxidising and reducing agent in acidic medium, but not in basic medium.
2019 JEE Mains MCQ
JEE Main 2019 (Online) 10th January Morning Slot
The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are :
A.
3 and 2
B.
2 and 1
C.
2 and 0
D.
3 and 1
2019 JEE Mains MCQ
JEE Main 2019 (Online) 9th January Evening Slot
The temporary hardness of water is due to :
A.
Na2SO4
B.
NaCl
C.
Ca(HCO3)2
D.
CaCl2
2019 JEE Mains MCQ
JEE Main 2019 (Online) 9th January Morning Slot
The isotopes of hydrogen are :
A.
Tritium and protium only
B.
Protium and Deuterium only
C.
Protium, deuterium and tritium
D.
Deuterium and tritium only
2018 JEE Mains MCQ
JEE Main 2018 (Offline)
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 formed are, respectively :
A.
H2O and (H2O + OH-)
B.
(H2O + O2) and H2O
C.
(H2O + O2) and (H2O + OH-)
D.
H2O and (H2O + O2)
2017 JEE Mains MCQ
JEE Main 2017 (Online) 8th April Morning Slot
In which of the following reactions, hydrogen peroxide acts as an oxidizing agent ?
A.
HOCl + H2O2 $ \to $ H3O+ + Cl$-$ + O2
B.
I2 + H2O2 + 2OH$-$ $ \to $ 2I$-$ + 2H2O + O2
C.
2Mn$O_4^ - $ + 3H2O2 $ \to $ 2 MnO2 + 3O2 + 2H2O + 2OH$-$
D.
PbS + 4H2O2 $ \to $ PbSO4 + 4H2O
2016 JEE Mains MCQ
JEE Main 2016 (Online) 10th April Morning Slot
Identify the reaction which does not liberate hydrogen :
A.
Reaction of zinc with aqueous alkali.
B.
Electrolysis of acidified water using Pt electrodes.
C.
Allowing a solution of sodium in liquid ammonia to stand.
D.
Reaction of lithium hydride with B2H6.
2016 JEE Mains MCQ
JEE Main 2016 (Online) 9th April Morning Slot
Identify the incorrect statement regarding heavy water :
A.
It reacts with Al4C3 to produce CD4 and Al(OD)3 .
B.
It is used as a coolant in nuclear reactors.
C.
It reacts with CaC2 to produce C2D2 and Ca(OD)2 .
D.
It reacts with SO3 to form deuterated sulphuric acid (D2SO4).
2016 JEE Mains MCQ
JEE Main 2016 (Offline)
Which one of the following statements about water is FALSE?
A.
Water is oxidized to oxygen during photosynthesis
B.
Water can act both as an acid and as a base.
C.
There is extensive intramolecular hydrogen bonding in the condensed phase.
D.
Ice formed by heavy water sinks in normal water
2015 JEE Mains MCQ
JEE Main 2015 (Offline)
From the following statements regarding H2O2, choose the incorrect statement :
A.
It decomposes on exposure to light
B.
It has to be stored in plastic or wax lined glass bottles in dark
C.
It has to be kept away from dust
D.
It can act only as an oxidizing agent
2012 JEE Mains MCQ
AIEEE 2012
Very pure hydrogen (99.9%) can be made by which of the following processes?
A.
Reaction of methane with steam
B.
Mixing natural hydrocarbons of high molecular weight
C.
Electrolysis of water
D.
Reaction of salt like hydrides with water
2008 JEE Mains MCQ
AIEEE 2008
In context with the industrial preparation of hydrogen from water gas (CO + H2), which of the following is the correct statement?
A.
CO and H2 are fractionally separated using differences in their densities
B.
CO is removed by absorption in aqueous Cu2Cl2 solution
C.
H2 is removed through occlusion with Pd
D.
CO is oxidised to CO2 with steam in the presence of a catalyst followed by absorption of CO2 in alkali
2005 JEE Mains MCQ
AIEEE 2005
Which of the following statements in relation to the hydrogen atom is correct?
A.
3s orbital is lower in energy than 3p orbital
B.
3p orbital is lower in energy than 3d orbital
C.
3s and 3p orbitals are of lower energy than 3d orbital
D.
3s, 3p and 3d orbitals all have the same energy
2003 JEE Mains MCQ
AIEEE 2003
Which one of the following process will produce hard water?
A.
Saturation of water with MgCO3
B.
Saturation of water with CaSO4
C.
Addition of Na2SO4 to water
D.
Saturation of water with CaCO3
2003 JEE Mains MCQ
AIEEE 2003
Which of the following could act as a propellant for rockets?
A.
Liquid oxygen + liquid argon
B.
Liquid hydrogen + liquid oxygen
C.
Liquid nitrogen + liquid oxygen
D.
Liquid hydrogen + liquid nitrogen