1333 + Interview Questions in HYDROGEN IN GENERAL AWARENESS Page 27 InterviewSolution

1301.	Which of the following will not liberate dihydrogen ?A. `Zn + H_(2)SO_(4)` (di.)B. `Zn + NaOH(aq)`C. `Cu + H_(2)SO_(4)`(conc.)D. `F_(2) + H_(2)O`
Answer» Correct Answer - C::D

Discussion

1302.	Aluminium reacts with boiling water to liberate dihydrogen gas along with the formation ofA. Aluminium oxideB. aluminium hydroxideC. aluminium suboxideD. aluminium superoxide.
Answer» Correct Answer - A

Discussion

1303.	Write the Uses of Dihydrogen.
Answer» Uses of Dihydrogen In the synthesis of ammonia / in the manufacture of vanaspati fat / in the manufacture of bulk organic chemicals /used for the preparation of hydrogen chloride/ In metallurgical processes,/.Atomic hydrogen and oxy-hydrogen torches find use for cutting and welding / used as a rocket fuel/ used in fuel cells for generating electrical energy.

1303.

Write the Uses of Dihydrogen.

Answer»

Uses of Dihydrogen

In the synthesis of ammonia / in the manufacture of vanaspati fat / in the manufacture of bulk organic chemicals /used for the preparation of hydrogen chloride/ In metallurgical processes,/.Atomic hydrogen and oxy-hydrogen torches find use for cutting and welding / used as a rocket fuel/ used in fuel cells for generating electrical energy.

Discussion

1304.	Choose the correct statement about the given figures. A. (II) represents solid state while (III) represents liquid state.B. (II) represents liquid state while (III) represents solid state.C. (I) represents solid state while (III) represents liquid state.D. (I) represents liquid state While (III) represents solid state.
Answer» Correct Answer - B In liquid state water molecules are hydrogen bonded while in solid state water molecules are arranged in tetrahedral manner with molecules are arranged in tetrahedral manner with open cage ctructure.

Discussion

1305.	What happens when an alkaline solution of potassium ferricyanide is reacted with `H_(2)O_(2)`?A. Potassium ferricyanide is oxidised to potassium ferrocyanide becomes colourless and `H_(2)O_(2)` is oxidised.B. Potassium ferricyanide becomes colourless and `H_(2)O_(2)` is oxidised to `O_(2)`.C. Potassium ferricyanide is reduced to ferric hydroxide and `H_(2)O_(2)` is oxidised to `H_(2)O`.D. Potassium ferricyanide is reduced to potassium ferrocyanide and `H_(2)O_(2)` is oxidised to `O_(2)`.
Answer» Correct Answer - D `{:(2K_(3)[Fe(CN)_(6)]+2KOH to 2K_(4)[Fe(CN)_(6)]+H_(2)O+[O]),(" "H_(2)O_(2)+[O]to H_(2)O+O_(2)),(ulbar(2K_(3)[Fe(CN)_(6)]+2KOH+H_(2)O_(2)to 2K_(4)[Fe(CN)_(6)]+2H_(2)O+O_(2))):}`

Discussion

1306.	Can distilled water be called as deionized water.
Answer» Yes, distilled water does not contain any cations and anoins.

Discussion

1307.	Name a process which can remove both temporary and permanent hardness of water.
Answer» A process which can remove both temporary and permanent hardness of water is Permutite.

Discussion

1308.	Radioactive elements emit `alpha, beta` and `gamma` rays and are characterised by their half-lives. The radioactive isotope of hydrogen isA. protiumB. deuteriumC. tritiumD. hydronium
Answer» Correct Answer - C Nuclides with n/p (neutron-proton) ratio gt 1.5 are usually radioactive. For, tritium (n = 2, p =1), it is 2.

Discussion

1309.	Radioactive elements emit α, β and γ rays and are characterised by their halflives. The radioactive isotope of hydrogen is(i) Protium(ii) Deuterium(iii) Tritium(iv) Hydronium
Answer» (iii) Tritium

1309.

Radioactive elements emit α, β and γ rays and are characterised by their halflives. The radioactive isotope of hydrogen is(i) Protium(ii) Deuterium(iii) Tritium(iv) Hydronium

Answer»

(iii) Tritium

Discussion

1310.	Complete the reaction:Fe(s) + H2O(g) →
Answer» 3Fe(s) + 4H₂O(g) → Fe₃O₄(s) + 4H₂ (g).

Discussion

1311.	Complete the reaction : Fe(s) + H2O(g) →
Answer» 3Fe(s) + 4H₂O(g) → Fe₃O₄(s) + 4H₂(g)

Discussion

1312.	Which of the following is the correct statement?A. Hydrogen has the same I.E. as that of alkali metalsB. Hydrogen has strong tendency to gain one electron same as that of alkali metalsC. Hydrogen molecule is diatomic so are the halogensD. Electron affinity of hydrogen is same as that of halogens
Answer» Correct Answer - C

Discussion

1313.	A sample of hard water is allowed to pass through and anion exchanger. Will it produce lather with soap easily?
Answer» Na, Ca²⁺ and Mg²⁺ ions are still present and these will react with soap to form to form curdy while precipitate. Therefore, it will not produce lather with soap solution easily.

Discussion

1314.	The isotope of hydrogen which is radioactive isA. ProtiumB. TritiumC. DeuteriumD. Neutron
Answer» Correct Answer - B

Discussion

1315.	Radioactive elements emit `alpha, beta and gamma` rays and are characterised by their half-lives. The radioactive isotope of hydrogen isA. Protium 0B. DueteirumC. TritiumD. Hydronium
Answer» (C ) Tritium is the radioactive isotopes of hydrogen

Discussion

1316.	Which isotope of hydrogen is radioactive in nature?
Answer» Correct Answer - Tritium.

Discussion

1317.	A sample of hard water is allowed to pass through an anion exchanger. Will it produce lather with soap easily?
Answer» No, it will not produce lather with soap easily because Ca²⁺ ang Mg²⁺ ions are still present in hard water.

Discussion

1318.	Name the isotope of hydrogen which is radioactive in nature.
Answer» Tritium \(^3_1H\) is radioactive in nature.

Discussion

1319.	The inorganic compound obtained by the auto oxidation of 2-alkylanthraquinol isA. `H_(2)O`B. `H_(2)O_(2)`C. `H_(2)`D. `O_(2)`
Answer» Correct Answer - B

Discussion

1320.	A mixture of hydrazine and H2O2 with Cu(II) catalyst is used as a rocket propellant. Why?
Answer» The reaction between hydrazine and hydrogen peroxide is highly exothermic So, this mixture is used as a rocket propellant. NH₂NH₂ (l) + 2H₂O₂ (l) \(\overset{Cu(II)}{\rightarrow}\) N₂ (g) + 4H₂O (g)

1320.

A mixture of hydrazine and H2O2 with Cu(II) catalyst is used as a rocket propellant. Why?

Answer»

The reaction between hydrazine and hydrogen peroxide is highly exothermic So, this mixture is used as a rocket propellant.

NH₂NH₂ (l) + 2H₂O₂ (l) \(\overset{Cu(II)}{\rightarrow}\) N₂ (g) + 4H₂O (g)

Discussion

1321.	A mixture of hydrazine and `H_(2)O_(2)` with Cu(II) catalyst is used as a rocket prepellant . Why ?
Answer» The reaction between hydrazine and `H_(2)O_(2)` is highl exothermic and is accoumpanied by a large increase in the volume of the products and hence this mixture is used as a rocket propellant. `NH_(2)NH_(2)(l) + 2H_(2)O_(2)(l) overset( Cu (II))to N_(2)(g)uarr + 4H_(2)O(g) uarr`

Discussion

1322.	Give reasons:(i) Lakes freeze from top towards bottom.(ii) Ice floats on water.
Answer» i) During severe winter, the temperature of water in the lake keeps on decreasing. Since cold water is heavier, it keeps on going into the interior of the lake while warm water keeps on coming to the surface of the lake. This process continues till the temperature of entire water of lakes becomes 4°C. Since density of water is maximum at 277 K, any further decrease in the temperature will decrease its density. As a result, the temperature of the surface water keeps on decreasing and it ultimately freezes. Now, any further decrease in the temperature will decrease the temperature of water below 4°C. This process continues and as a result, the lakes keep on freezing from top to bottom. (ii) Density of ice is less than water due to presence of empty spaces created because of H-bonding between H₂O molecules. Hence, ice floats on water.

Discussion

1323.	Why do lakes freeze from top towards bottom?
Answer» The upper surface of lake is in contact with the cold environment and starts to freeze. The density of ice is less than that of liquid water. Therefore, ice floats on the surface. Thus, the ice layer at lower temperature floats over the water below it. Due to this the freezing of water into ice occurs continuously from top towards bottom.

Discussion

1324.	What do you understand by (i) electron-deficient,(ii) electron-précise and (iii) electron precise hydrides. Provide justification with suitable examples.
Answer» Electron-deficient: the hydrides which contain less than eight electron in their outmost shell are called electron- deficient for exam B₂H₆ Electron- precise: These hydrides contain exact number of electron to form covalent bonds and hence are called as electron-precise hydrides for example: CH₄, SIH₄,GeH₄,SnH₄ Electron-rich: these have more electron than required to form nomal covalent bond and are called as electron rich hydrides. For example NH₃,PH₃,H₂O,H₂S.

1324.

What do you understand by (i) electron-deficient,(ii) electron-précise and (iii) electron precise hydrides. Provide justification with suitable examples.

Answer»

Electron-deficient: the hydrides which contain less than eight electron in their outmost shell are called electron- deficient for exam B₂H₆

Electron- precise: These hydrides contain exact number of electron to form covalent bonds and hence are called as electron-precise hydrides for example: CH₄, SIH₄,GeH₄,SnH₄

Electron-rich: these have more electron than required to form nomal covalent bond and are called as electron rich hydrides. For example NH₃,PH₃,H₂O,H₂S.

Discussion

1325.	Given reasons (i) Lakes freeze form top towards bottom. (ii) Ice floats on water.
Answer» (i) During severe winter, the temperature of water in the lake keeps on decreasing . Since cold water is heavier, therefore, it keeps on going into the interior of the lake while warm water from inside the lake keeps on coming to the surface of the lake. This process continues till the temperature of entire water of the lakes becomes 277 K. Since denisty of water is maximum at 277 K , therefore, any further decrease in the temperature of the surface water will decrease its density . As a result , the temperature of the surface water keeps on decreasing and ultimately freezes while the temperature of water underneath the surface remains at 277 K . Further decrease in the temperature of ice on the surface will decrease the temperature of water below 277 K lying underneath the surface of water. This decrease in temperature continues till it freezes. This process continues and as a result , the lakes keeps on freezing from top to bottom.

Discussion

1326.	With the increasesA. orthoB. metaC. paraD. None.
Answer» Correct Answer - A With the increase in temperature the proportion of ortho form of `H_(2)` increases till its proportion reaches `75%`.

Discussion

1327.	Consider the following reaction I.`H_(2)(g) +X_(2)(g) to 2HX(g)(X= F, Cl, Br,l)` II. `2H_(2)(g)+O_(2)(g) =underset("heating")overset("Catalyst")to 2H_(2)O(l)` III. `3H_(2)(g)+N_(2)(g) =underset("Fe")overset("673 K. 200atm")to 2NH_(3)(g)` IV.`H_(2)(g) + Pd^(2+) (aq) to Pd(s)+2H^(+) (aq)` The correct reactions are .A. II, III and IVB. IV and VC. I, II and IVD. All of these
Answer» Correct Answer - D All reactions are correct.

Discussion

1328.	Complete the following chemical reactions: `(i) PbS(s) + H_(2)O_(2) (aq) to (ii) MnO_(4)^(-) (aq0 + H_(2)O_(2)(aq) to ` `(iii) CaO (s) + H_(2)O (g) to (iv) AlCl_(3) (g) + H_(2)O(l) to (v) Ca_(3)N_(2)(s) + H_(2)O(l) to ` Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions.
Answer» `(i) PbS(s) + 4H_(2)O_(2) (aq) to PbSO_(4) (s) + 4H_(2)O (l)` `(ii) 2MnO_(4)^(-) (aq) + 5H_(2)O_(2) (l) + 6H^(+) (aq) to 2Mn^(2+)(aq) + 8 H_(2)O(l) + 5O_(2)(g)` `(iii)CaO (s) + H_(2)O (g) to Ca(OH)_(2)(aq)` `(iv) AlCl_(3) (g) + 3H_(2)O(l) to Al(OH)_(3)(s) + 3HCl (aq)` `(v) Ca_(3)N_(2) (s) + 6H_(2)O(l) to 3Ca(OH)_(2) (aq) + 2NH_(3)(aq)` (a) Hydrolysis reactions : (iii), (iv), (v). (b). Redox reactions : (i) and (ii).

Discussion

1329.	Complete the following reactions : `(i) PbS(s) + H_(2)O_(2)(aq) to " "(ii) CO(g) + 2H_(2) underset("Catalyst")overset("Cobalt")to `
Answer» (i) `PbS(s) + 4H_(2)O_(2)(aq) to PbSO_(4) + 4H_(2)O " "(ii) CO(g) + 2H_(2)(g) underset("Catalyst")overset("Cobalt")to CH_(3)OH(l)`

Discussion

1330.	Which of the following species is reduced by `H_(2)O_(2)`A. `\|Fe(CN)_(6)\|^(4-)`B. `\|Fe(CN)_(6)\|^(3-)` in alkaline mediumC. `NO_(2)^(-)`D. `I^(-)//HCl`.
Answer» Correct Answer - B `\|Fe(CN)_(6)\|^(3-)"is reduced to"\|Fe(CN)_(6)\|^(4-) "in alkaline solution". 2\|Fe(CN)_(6)\|^(3-)+2OH^(-)+H_(2)O_(2)to2\|Fe(CN)_(6)\|^(4-)+2H_(2)O+O_(2)`

Discussion

1331.	Complete the following reactions : `(i) H_(2)(g) + M_(m)O_(o)(s) overset(Delta)to" "(ii) CO(g) + H_(2)(g) underset("catalyst")overset(Delta)to ` (iii)` C_(3)H_(8)(g) + 3H_(2)O(g) underset("Catalyst")overset(Delta)to " "(iv) Zn(s)+ NaOH(aq) overset("heat")to`
Answer» `(i) oH_(2)(g) + M_(m)O_(o)(s) overset(Delta)mM(s) + oH_(2)O(l) " "(ii) CO(g)+ 2H_(2)(g)underset("Catalyst")overset(Delta)to underset("Methanol")(CH_(3)OH(l))` `(iii) C_(3)H_(8)(g) + 3H_(2)O(g) overset(Ni,1270K)to 3CO(g) + 7H_(2)(g)` `(iv) Zn(s) + 2NaOH (aq) overset("heat")to underset("Sod. zincate")(na_(2)ZnO_(2)(aq))+ H_(2)(g)`

Discussion

1332.	If `100 mL` of acidified `2NH_(2)O_(2)` is allowed to react with `KMnO_(4)` solution till there is light tinge of purples colour, the volume of oxygen produced at `STP` is :A. `2.24 L`B. `1.12 L`C. `3.36 L`D. `4.48 L`
Answer» Correct Answer - A Volume of `O_(2)` at `STP` `=100mLxx11.2mL` volume strength `=1120 mL` of `O_(2)at STP` Since `1N=5.6` volume strength of `H_(2)O_(2)` `2N=11.2` volume strength of `H_(2)O_(2)` Volume of `O_(2)` produced by `H_(2)O_(2)=1120 mL` Same volume of `O_(2)` will be produced by `KMnO_(4)`, i.e., `1120 mL`

Discussion

1333.	Ethylene and `H_2O_2` react to giveA. `CO_(2),H_(2)O`B. `CO,H_(2)O`C. Ethylene oxideD. Ethylene glycol
Answer» Correct Answer - D `H_(2)C=CH_(2)+H_(2)O_(2)tounderset("Ethylene")underset(OH)underset(\|)(H_(2)C)-underset("glycol")underset(OH)underset(\|)(CH_(2))`

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following will not liberate dihydrogen ?A. `Zn + H_(2)SO_(4)` (di.)B. `Zn + NaOH(aq)`C. `Cu + H_(2)SO_(4)`(conc.)D. `F_(2) + H_(2)O`

Aluminium reacts with boiling water to liberate dihydrogen gas along with the formation ofA. Aluminium oxideB. aluminium hydroxideC. aluminium suboxideD. aluminium superoxide.

Write the Uses of Dihydrogen.

Can distilled water be called as deionized water.

Name a process which can remove both temporary and permanent hardness of water.

Radioactive elements emit `alpha, beta` and `gamma` rays and are characterised by their half-lives. The radioactive isotope of hydrogen isA. protiumB. deuteriumC. tritiumD. hydronium

Radioactive elements emit α, β and γ rays and are characterised by their halflives. The radioactive isotope of hydrogen is(i) Protium(ii) Deuterium(iii) Tritium(iv) Hydronium

Complete the reaction:Fe(s) + H2O(g) →

Complete the reaction : Fe(s) + H2O(g) →

Which of the following is the correct statement?A. Hydrogen has the same I.E. as that of alkali metalsB. Hydrogen has strong tendency to gain one electron same as that of alkali metalsC. Hydrogen molecule is diatomic so are the halogensD. Electron affinity of hydrogen is same as that of halogens

A sample of hard water is allowed to pass through and anion exchanger. Will it produce lather with soap easily?

The isotope of hydrogen which is radioactive isA. ProtiumB. TritiumC. DeuteriumD. Neutron

Radioactive elements emit `alpha, beta and gamma` rays and are characterised by their half-lives. The radioactive isotope of hydrogen isA. Protium 0B. DueteirumC. TritiumD. Hydronium

Which isotope of hydrogen is radioactive in nature?

A sample of hard water is allowed to pass through an anion exchanger. Will it produce lather with soap easily?

Name the isotope of hydrogen which is radioactive in nature.

The inorganic compound obtained by the auto oxidation of 2-alkylanthraquinol isA. `H_(2)O`B. `H_(2)O_(2)`C. `H_(2)`D. `O_(2)`

A mixture of hydrazine and H2O2 with Cu(II) catalyst is used as a rocket propellant. Why?

A mixture of hydrazine and `H_(2)O_(2)` with Cu(II) catalyst is used as a rocket prepellant . Why ?

Give reasons:(i) Lakes freeze from top towards bottom.(ii) Ice floats on water.

Why do lakes freeze from top towards bottom?

What do you understand by (i) electron-deficient,(ii) electron-précise and (iii) electron precise hydrides. Provide justification with suitable examples.

Given reasons (i) Lakes freeze form top towards bottom. (ii) Ice floats on water.

With the increasesA. orthoB. metaC. paraD. None.

Complete the following chemical reactions: `(i) PbS(s) + H_(2)O_(2) (aq) to (ii) MnO_(4)^(-) (aq0 + H_(2)O_(2)(aq) to ` `(iii) CaO (s) + H_(2)O (g) to (iv) AlCl_(3) (g) + H_(2)O(l) to (v) Ca_(3)N_(2)(s) + H_(2)O(l) to ` Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions.

Complete the following reactions : `(i) PbS(s) + H_(2)O_(2)(aq) to " "(ii) CO(g) + 2H_(2) underset("Catalyst")overset("Cobalt")to `

Which of the following species is reduced by `H_(2)O_(2)`A. `|Fe(CN)_(6)|^(4-)`B. `|Fe(CN)_(6)|^(3-)` in alkaline mediumC. `NO_(2)^(-)`D. `I^(-)//HCl`.

Complete the following reactions : `(i) H_(2)(g) + M_(m)O_(o)(s) overset(Delta)to" "(ii) CO(g) + H_(2)(g) underset("catalyst")overset(Delta)to ` (iii)` C_(3)H_(8)(g) + 3H_(2)O(g) underset("Catalyst")overset(Delta)to " "(iv) Zn(s)+ NaOH(aq) overset("heat")to`

If `100 mL` of acidified `2NH_(2)O_(2)` is allowed to react with `KMnO_(4)` solution till there is light tinge of purples colour, the volume of oxygen produced at `STP` is :A. `2.24 L`B. `1.12 L`C. `3.36 L`D. `4.48 L`

Ethylene and `H_2O_2` react to giveA. `CO_(2),H_(2)O`B. `CO,H_(2)O`C. Ethylene oxideD. Ethylene glycol