Hydrogen, Hydrides and Water

Interactive Feed

JEE Advanced 2015

$Fe^{3 +}$ is reduced to $Fe^{2 +}$ by using -

H_{2} O_{2}

in presence of

NaOH

(B)

Na_{2} O_{2}

in water

(C)

H_{2} O_{2}

in presence of

H_{2} SO_{4}

(D)

Na_{2} O_{2}

in presence of

H_{2} SO_{4}

JEE Advanced 2017

LEVELJEE Main

Which of the following combination will produce $H_{2}$ gas?

(A)

Zn metal and NaOH(aq)

(B)

Au metal and NaCN(aq) in the presence of air

(C)

Cu metal and conc.

HNO_{3}

(D)

Fe metal and conc.

HNO_{3}

JEE Main 2020

LEVELJEE Main

In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is

(A)

more efficient as it can exchange only cations

(B)

less efficient as it exchanges only anions

(C)

less efficient as the resins cannot be regenerated

(D)

more efficient as it can exchange both cations as well as anions

JEE Main 2021

LEVELJEE Main

The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are

(A)

- SO_{3} H

and

- NH_{2}

(B)

- SO_{3} H

and

- COOH

(C)

- NH_{2}

and

- COOH

(D)

- NH_{2}

and

- SO_{3} H

JEE Main 2019

LEVELJEE Main

The metal that gives hydrogen gas upon treatment with both acid as well as base is

Hydrogen peroxide, in the pure state, is

(A)

non-planar and almost colourless

(B)

linear and blue in colour

(C)

linear and almost colourless

(D)

planar and blue in colour

JEE Main 2021

LEVELJEE Main

Given below are two statements : One is labelled as Assertion (A) and the other labelled as Reason (R). Assertion (A) During the boiling of water having temporary hardness, $Mg(HCO_{3})_{2}$ is converted to $MgCO_{3}$ . Reason (R) The solubility product of $Mg(OH)_{2}$ is greater than that of $MgCO_{3}$ . In the light of the above statements, choose the most appropriate answer from the options given below

(A)

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(B)

(A) is true but (R) is false.

(C)

Both A and R are true and R is the correct explanation of (A).

(D)

(A) is false but (R) is true.

JEE Main 2021

LEVELJEE Main

Given below are two statements : One is labelled as Assertion A and other is labelled as Reason R. Assertion (A) The dihedral angles in $H_{2} O_{2}$ 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)

A is correct but R is not correct.

(B)

Both A and R are correct but R is not the correct explanation of A.

(C)

Both A and R are correct and R is the correct explanation of A.

(D)

A is not correct but R is correct.

JEE Main 2020

LEVELJEE Main

Among statements (A) - (D), the correct ones are (A) decomposition of hydrogen peroxide gives dioxygen. (B) like hydrogen peroxide, compounds, such as $KClO_{3}$ , $Pb (NO_{3})_{2}$ and $NaNO_{3}$ 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) and (C) only

(B)

(A), (B), (C) and (D)

(C)

(A), (C) and (D) only

Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are $(x)$ , $(y)$ and $(z)$ , the sum of $(x)$ , $(y)$ and $(z)$ is

The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are

5 g of zinc is treated separately with an excess of (1) dilute hydrochloric acid and (2) aqueous sodium hydroxide. The ratio of the volume of $H_{2}$ evolved in these two reactions is

The one that is not suitable for the removal of permanent hardness of water is

Treatment with sodium carbonate

LEVELJEE Main

In context with the industrial preparation of hydrogen from water gas ( $CO + H_{2}$ ), which of the following is the correct statement ?

(A)

CO

and

H_{2}

are fractionally separated using differences in their densities

(B)

CO

is removed by absorption in aqueous

Cu_{2} Cl_{2}

solution

(C)

H_{2}

is removed through occlusion with

Pd

(D)

CO

is oxidised to

CO_{2}

with steam in the presence of a catalyst followed by absorption of

CO_{2}

in alkali.

LEVELJEE Main

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 salts like hydrides with water

JEE Main 2021

LEVELJEE Main

Which one of the following statements is incorrect ?

(A)

Atomic hydrogen is produced when

H_{2}

molecules at a high temperature are irradiated with UV radiation.

(B)

At around

2000 K

, the dissociation of dihydrogen into its atoms is nearly

8.1%

(C)

Bond dissociation enthalpy of

H_{2}

is highest among diatomic gaseous molecules which contain a single bond .

(D)

Dihydrogen is produced on reacting zinc with

HCl

as well as

NaOH(aq)

JEE Main 2021

LEVELJEE Main

Hydrogen peroxide reacts with iodine in basic medium to give

(A)

IO_{4}^{-}

(B)

IO^{-}

(C)

I^{-}

(D)

IO_{3}^{-}

JEE Main 2021

LEVELBoard

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

The oxide that gives $H_{2} O_{2}$ most readily on treatment with $H_{2} O$ is

(A)

P b O_{2}

(B)

N a_{2} O_{2}

(C)

S n O_{2}

(D)

B a O_{2} \cdot 8 H_{2} O

JEE Main 2019

LEVELJEE Main

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(HCO_{3})_{2}

and

Mg(OH)_{2}

(B)

Ca(HCO_{3})_{2}

and

Ca(OH)_{2}

(C)

Mg(HCO_{3})_{2}

and

MgCO_{3}

(D)

Ca(HCO_{3})_{2}

and

CaO

JEE Main 2021

LEVELJEE Main

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 $H_{2} O$ is greater than $D_{2} O$ . Which of the given statements are correct?

(A) $HOCl + H_{2} O_{2} ⟶ H_{3} O^{+} + Cl^{-} + O_{2}$ (B) $I_{2} + H_{2} O_{2} + 2 OH^{-} ⟶ 2 I^{-} + 2 H_{2} O + O_{2}$ Choose the correct option.

(A)

H_{2} O_{2}

acts as oxidising agent in equations (A) and (B).

(B)

H_{2} O_{2}

acts as reducing agent in equations (A) and (B).

(C)

H_{2} O_{2}

act as oxidising and reducing agent respectively in equations (A) and (B).

(D)

H_{2} O_{2}

acts as reducing and oxidising agent respectively in equations (A) and (B).

JEE Main 2016

LEVELJEE Main

Which one of the following statements about water is false?

(A)

Water can act both as an acid and as a base

(B)

There is extensive intramolecular hydrogen bonding in the condensed phase

(C)

Ice formed by heavy water sinks in normal water

(D)

Water is oxidised to oxygen during photosynthesis

JEE Main 2021

LEVELJEE Main

The correct statements about $H_{2} O_{2}$ are (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.

(A)

(A), (B), (C) and (D)

Dihydrogen of high purity ( $> 99.95%$ ) is obtained through

(A)

the reaction of

Zn

with dilute

HCl

(B)

the electrolysis of acidified water using

Pt

electrodes

(C)

the electrolysis of brine solution

(D)

the electrolysis of warm

Ba(OH)_{2}

solution using

Ni

electrodes

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Fe3+ is reduced to Fe2+ by using -

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Which of the following combination will produce H2​ gas?

In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is

The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are

The metal that gives hydrogen gas upon treatment with both acid as well as base is

Hydrogen peroxide, in the pure state, is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z), the sum of (x), (y) and (z) is

The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are

The one that is not suitable for the removal of permanent hardness of water is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } In context with the industrial preparation of hydrogen from water gas (CO+H2​), which of the following is the correct statement ?

Very pure hydrogen (99.9) can be made by which of the following processes?

Which one of the following statements is incorrect ?

Hydrogen peroxide reacts with iodine in basic medium to give

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

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The oxide that gives H2​O2​ most readily on treatment with H2​O is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } 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

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } (A) HOCl+H2​O2​⟶H3​O++Cl−+O2​ (B) I2​+H2​O2​+2OH−⟶2I−+2H2​O+O2​ Choose the correct option.

Which one of the following statements about water is false?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Dihydrogen of high purity (>99.95%) is obtained through

$Fe^{3 +}$ is reduced to $Fe^{2 +}$ by using -

Which of the following combination will produce $H_{2}$ gas?

Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are $(x)$ , $(y)$ and $(z)$ , the sum of $(x)$ , $(y)$ and $(z)$ is

In context with the industrial preparation of hydrogen from water gas ( $CO + H_{2}$ ), which of the following is the correct statement ?

The oxide that gives $H_{2} O_{2}$ most readily on treatment with $H_{2} O$ 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

(A) $HOCl + H_{2} O_{2} ⟶ H_{3} O^{+} + Cl^{-} + O_{2}$ (B) $I_{2} + H_{2} O_{2} + 2 OH^{-} ⟶ 2 I^{-} + 2 H_{2} O + O_{2}$ Choose the correct option.

Dihydrogen of high purity ( $> 99.95%$ ) is obtained through