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The concentration of fluoride, lead, nitrate, and iron in a water sample from an underground lake was found to be 1 ppm, 40 ppm, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of :
Option: 1 Fluoride
Option: 10 Lead
Option: 19 Nitrate
Option: 36 Iron

As we learned in concept

Hard Water -

It contains calcium and Magnesium salt in the form of hydrogen carbonate , chloride and sulphate

- wherein

Hard water does not give Lathers with soap.

Maximum permissible concentration of constituents

lead : 50 ppm

nitrate : 50 ppm

Iron : 0.2 ppm

fluoride: 1 ppm

Therefore, option (3) is correct.

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Ritika Jonwal

Which one of the following statements about water is FALSE?
Option: 1 Water is oxidized to oxygen during photosynthesis..
Option: 2 Water can act both as an acid and as a base
Option: 3 There is extensive intramolecular hydrogen bonding in the condensed phase
Option: 4 Ice formed by heavy water sinks in normal water.

There is intermolecular hydrogen bounding in condensed phase of water and not intramolecular hydrogen bonding.

During Photosynthesis, Water is oxidised to Oxygen according to the reaction

$6CO_2 + 6 H_2O \quad \longrightarrow \quad C_6H_{12}O_6 + 6O_2$

Water can react with both acid as well as base

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Ritika Jonwal

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In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is:
Option: 1 less efficient as the resins cannot be regenerated
Option: 2 less efficient as it exchange only anions
Option: 3More efficient as it can exchange only cations
Option: 4More efficient as it exchange both cations as well as anions

As we have learnt,

The synthetic resins method is more efficient as it can exchange both cations and anions.

Therefore, Option(4) is correct.

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Kuldeep Maurya

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 :
Option: 1 $4$
Option: 2 3
Option: 3 2
Option: 4 1

As we have learnt,

Hydrogen has 3 isotopes. And these isotopes differ from each other because of presence of different number of neutrons.

Protium, $^{1}_{1}H$
Deuterium, $^{2}_{1}H$ or D
Tritium, $^{3}_{1}H$ or T

Number of neutrons in Protium is $0.$
Number of neutrons in Deuterium is $1.$
Number of neutrons in Tritium is $2.$

Thus, the correct answer is $0+1+2=3$

Therefore, Option(2) is correct.

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Kuldeep Maurya

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The equation that represents the water-gas shift reaction is :
Option: 1 $\mathrm{CH_{4}(g)+H_{2}O(g)\xrightarrow[Ni]{1270K}CO(g)+3H_{2}(g)}$
Option: 2 $\mathrm{2C(s)+O_{2}(g)+4N_{2}\overset{1273K}{\rightarrow}2CO(g)+4N_{2}(g)}$
Option: 3 $\mathrm{C(s)+H_{2}O(g)\overset{1270K}{\rightarrow}CO(g)+H_{2}(g)}$
Option: 4 $\mathrm{CO(g)+H_{2}O(g)\xrightarrow[catalyst]{673\; K}CO_{2}(g)+H_{2}(g)}$

Let check given equations one by one-

Therefore, the correct option is (4).

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Kuldeep Maurya

A 20.0 mL solution containing 0.2 g impure H₂O₂ reacts completely with 0.316 g of KMnO₄ in acidic solution. The purity of H₂O₂ (in%) is _________ (mol.wt.of H₂O₂ =34, mol. wt. of KMnO₄ = 158)
Option: 1 85
Option: 2 -
Option: 3 -
Option: 4 -

The reaction will be-

$\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{KmnO}_{4} \rightarrow \mathrm{Mn}^{+2}+\mathrm{O}_{2}$

In above-balanced reaction

Electron transfer of H₂O₂ (n) = 2 (-2 to 0 of Oxygen)

Electron transfer of KmnO₄ (n) = 5 (+7 to +2 of Mn)

We know this formula:

$\text {Number of Eq. of } \mathrm{H}_{2} \mathrm{O}_{2}=\text {Number of Eq. of } \mathrm{KMnO}_{4}$

( Mole X n-factor ) of H₂O₂= ( Mole X n-factor ) of KmnO₄

$\mathrm{x} \times 2=\frac{0.316}{158} \times 5$

$\mathrm{x}=5 \times 10^{-3} \mathrm{~mol}$

Now

Mass = Mole X Molar mass

$\mathrm{mass}_{\mathrm{H}_{2} \mathrm{O}_{2}}=5 \times 10^{-3} \times 34=0.17 \mathrm{gm}$

We know,

$%\text { purity }=\frac{\text { mass of pure product }}{\text { mass of impure product obtained }} \times 100 \%$

$%\text { purity of }\mathrm{H_2O_2} =\frac{0.17}{0.2}\times 100=85 \ %$

Ans = 85

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Kuldeep Maurya

NEET 2024 Most scoring concepts

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In the basic medium H₂O₂exhibits which of the following reaction? $\text { (A) } \mathrm{Mn}^{2+} \rightarrow \mathrm{Mn}^{4+}$ $(\mathrm{B}) \mathrm{I}_{2} \rightarrow \mathrm{I}^{-}$ $\text { (C) } \mathrm{PbS} \rightarrow \mathrm{PbSO}_{4}$ Choose the most appropriate answer from the options given below:
Option: 1 A, B only
Option: 2 A only
Option: 3 B only
Option: 4 A, C only

In basic medium, oxidizing action of H₂O₂

In basic medium, reducing action of H₂O₂

In acidic medium, oxidising action of H₂O₂ , But not in a basic medium.

$\mathrm{PbS}(\mathrm{s})+4 \mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \rightarrow \mathrm{PbSO}_{4}(\mathrm{~s})+4 \mathrm{H}_{2} \mathrm{O}(\ell)$

Therefore, the Correct option is (1)

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Kuldeep Maurya

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) used for the study of reaction mechanism (D) has a higher dielectric constant than water Choose the correct answer from the options given below

Option: 1 (C) only
Option: 2 (B) and (D) only
Option: 3 (D) only
Option: 4 (B) only

the correct statements about heavy water are

(A) used as a moderator in the nuclear reactor

(B) obtained as a by-product in the fertilizer industry

But the incorrect statement about heavy water is

(D) has a higher dielectric constant than water.

because the dielectric constant of H₂O is greater than heavy water.

Therefore, Correct option is (3)

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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, the energy is transmitted in the form of dihydrogen. In the light of above statments, choose the correct answer from the options given below :

Option: 1 Both statement I and II are true
Option: 2 Statement I is true and statement II is false
Option: 3 Both statement I and II are false
Option: 4 Statement I is false and but statement II is true

(a) H₂O₂ can act as oxidizing & reducing agent in both acidic & basic mediums.

(b) The basic principle of the hydrogen economy is the transportation and storage of energy in the form of liquids or gaseous dihydrogen. The advantage of hydrogen economy is that energy is transmitted in the form of dihydrogen and not as electric power.

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The correct statement about H₂O₂are: A. used in the treatment of effluents. B. used as both oxidizing 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:
Option: 1 B,C and D only
Option: 2 A,B and D only
Option: 3 A, C and D only
Option: 4 A,B,C and D

(1) In H₂O₂ oxidation of oxygen is -1 Therefore acts both as oxidising and reducing agents.
(2) H₂O₂ is miscible in water due to intermolecular H-Bonding.
(3) H₂O₂ has open book structure in which both –OH groups are not on the same plane.

(4) H₂O₂ is used in the treatment of effluents.

So, correct statements about H₂O₂ are (A), (B) and (D) only.

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Kuldeep Maurya

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Kuldeep Maurya

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 : Option: 1 Option: 2 3 Option: 3 2 Option: 4 1

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Kuldeep Maurya

JEE Main high-scoring chapters and topics

The equation that represents the water-gas shift reaction is :Option: 1 Option: 2 Option: 3 Option: 4

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Kuldeep Maurya

A 20.0 mL solution containing 0.2 g impure H2O2 reacts completely with 0.316 g of KMnO4 in acidic solution. The purity of H2O2 (in%) is _________ (mol.wt.of H2O2 =34, mol. wt. of KMnO4 = 158)Option: 1 85Option: 2 -Option: 3 -Option: 4 -

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 :
Option: 1 $4$
Option: 2 3
Option: 3 2
Option: 4 1

A 20.0 mL solution containing 0.2 g impure H₂O₂ reacts completely with 0.316 g of KMnO₄ in acidic solution. The purity of H₂O₂ (in%) is _________ (mol.wt.of H₂O₂ =34, mol. wt. of KMnO₄ = 158)
Option: 1 85
Option: 2 -
Option: 3 -
Option: 4 -