Both para and ortho hydrogen exist

Chemistry - Hydrogen - Quiz-3

The correct increasing order of the acidity of ${CO}_{2}, H_{2} O and H_{2} O_{2}$ is $-$

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${CO}_{2} < H_{2} O_{2} < H_{2} O$
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$H_{2} O < H_{2} O_{2} < {CO}_{2}$
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$H_{2} O < H_{2} O_{2} > {CO}_{2}$
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$H_{2} O_{2} > {CO}_{2} > H_{2} O$

At absolute zero.

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Only para hydrogen exists
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Only ortho hydrogen exists
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Both para and ortho hydrogen exist
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None of these

Metal which does not react with cold water but evolves H₂ with steam is –

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Na
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K
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Pt
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Fe

The oxidation states of the most electronegative element in the products of the reaction between ${BaO}_{2}$ with dil. $H_{2} {SO}_{4}$ are–

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0, and –1
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–1, and –2
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–2, and 0
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–2, and + 1

Hardness of water is due to presence of salts of –

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${Na}^{+} and K^{+}$
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${Ca}^{2 +} and {Mg}^{2 +}$
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${Ca}^{2 +} and K^{+}$
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${Ca}^{2 +} and {Na}^{+}$

Ice melts at a temperature lower than its usual melting point when the pressure is increased. This is because-

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Ice has less density than water
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Pressure generates heat
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The chemical bonds break under pressure
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Ice is not a true solid

An ionic compound is dissolved simultaneously in heavy water and ordinary water, its solubility is –

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Larger in heavy water
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Smaller in heavy water
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Solubility is same in both waters
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Smaller in simple water

Lab method of preparation of $H_{2} O_{2}$ is -

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(A) Cold H2SO4+BaO2
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(B)&nsp; $HCl + {BaO}_{2}$
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(C) $Conc . H_{2} {SO}_{4} + {Na}_{2} O_{2}$
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(D) $H_{2} + O_{2}$

The oxide that gives hydrogen peroxide $(H_{2} O_{2})$ on the treatment with a dilute acid $(H_{2} {SO}_{4})$ is –

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() ${MnO}_{2}$
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() ${PbO}_{2}$
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() ${Na}_{2} O_{2}$
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() ${TiO}_{2}$

The oxidising property of $H_{2} O_{2}$ is best explained by assuming that two oxygen atoms in its molecule are.

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Bonded differently
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Bonded similarly
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Bonded covalently
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Bonded by hydrogen bonds

$H_{2} O$ has higher boiling point than $H_{2} S$ because.

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$H_{2} O$ is a smaller molecule and hence more closely packed
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The bond angle in $H_{2} O$ is more than in $H_{2} S$ and hence the former molecules are more tightly packed
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Of intermolecular hydrogen bonding in liquid $H_{2} O$
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The latent heat of vaporisation is higher for $H_{2} O$ than for $H_{2} S$

On partial hydrolysis of one mole of peroxodisulphuric acid produces

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two moles of sulphuric acid
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two moles of peroxomonosulphuric acid
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one mole of sulphuric acid and one mole of peroxomonosulphuric acid
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one mole of sulphuric acid, one mole of peroxomonosulphuric acid and one mole of hydrogen peroxide.

The maximum possible number of hydrogen bonds a water molecule can form is –

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2
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4
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3
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1

$H_{2} O_{2}$ acts as antiseptic due to its –

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Reducing property
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Oxidising property
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Bleaching property
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Acidic property

A compound that has both polar and non-polar bonds is –

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${NH}_{4} Cl$
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$HCN$
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$H_{2} O_{2}$
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${CH}_{4}$

The most reactive state of hydrogen is –

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Atomic hydrogen
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Heavy hydrogen
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Molecular hydrogen
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Nascent hydrogen

In which of the following reactions is $H_{2} O_{2}$ acting as an acid.

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() $2 {KMnO}_{4} + 3 H_{2} {SO}_{4} + 5 H_{2} O_{2} \to K_{2} {SO}_{4} + {MnO}_{4} + 2 {MnSO}_{4} + 8 H_{2} O + 5 O_{2}$
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() $2 K_{3} Fe {(CN)}_{6} + 2 KOH + H_{2} O_{2} \to 2 K_{4} Fe {(CN)}_{6} + 2 H_{2} O + O_{2}$
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() $O_{3} + H_{2} O_{2} \to H_{2} O + 2 O_{2}$
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() $Ba {(OH)}_{2} + H_{2} O_{2} \to {BaO}_{2} + H_{2} O$

Exhausted permutit does not contain ............ ion –

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(A) Na+
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(B)&nsp; ${Mg}^{2 +}$
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(C) ${Al}^{3 +}$
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(D) ${Si}^{4 +}$

Which of the following metal cannot absorb hydrogen –

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Pd
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Al
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Ni
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Co

The best explanation for not placing hydrogen with the group of alkali metals or halogens is.

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Hydrogen can form compounds with all other elements
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Hydrogen is much lighter element than the alkali metals or the halogens
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The IE of hydrogen is too high for group of alkali metals but too low for halogen group
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None of these

The colour of hydrogen is –

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Blue
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Yellow
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Orange
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No colour

In which of the following compounds, hydrogen exists in the atomic state –

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Metallic hydrides
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Ionic hydrides
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Molecular hydrides
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Water

${}_{1}^{2}H$ stands for –

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Protium
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Heavy water
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Deuterium
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Tritium

Covalent hydride among the following is -

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${NH}_{3} and B_{2} H_{6}$
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${CaH}_{2} and B_{2} H_{6}$
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$NaH and {CaH}_{2}$
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$NaH and {NH}_{3}$

100 ml of a sample of hard water required 25.1 ml of 0.02 (N) $H_{2} {SO}_{4}$ for complete reaction. What is the hardness of the given water sample ? (sp. gravity of given water sample = 1 gm/ml)

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() 200 ppm
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() 250 ppm
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() 251 ppm
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() 258 ppm

A mixture of hydrazine $(N_{2} H_{4})$ and $58 - 60 %$ solution of $H_{2} O_{2}$ is used as.

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Antiseptic
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Fertilizer
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Rocket fuel
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None

50 lit of hard water of 120 ppm temporary hardness is mixed with 1.62 kg of $Ca {(OH)}_{2},$ what is the hardness of the resulting water ? (The sp. gr. of hard water = 1 gm/ml)

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() 8.088 × 10⁵ ppm
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() 8.088 × 10⁴ ppm
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() 80 ppm
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() 808 ppm

Commercially $H_{2} O_{2}$ is now prepared by –

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(A) Action of H2SO4 on barium peroxide
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(B) Action of&nsp; $H_{2} {SO}_{4}$ on sodium peroxide
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(C) Eletrolysis of $H_{2} {SO}_{4}$
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(D) By burning hyrogen in excess of oxygen

Hydrogen peroxide does not

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Liberate iodide from $KI$
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Turn the titanium salt yellow
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Give silver peroxide with moist silver oxide
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Turn the mixture of aniline, ${KClO}_{3}$ and dilute $H_{2} {SO}_{4}$ violet

A sample of hard water was found to contain 68 ppm of ${CaSO}_{4}$ and 19 ppm of ${MgCl}_{2}$ . Its total hardness is –

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70 ppm
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50 ppm
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20 ppm
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100 ppm

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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