1333 + Interview Questions in HYDROGEN IN GENERAL AWARENESS Page 5 InterviewSolution

201.	Hydrogen has the tendency to lose one `e^(-)` and for mation of `H^(+)`, In this respect it resembles with :A. Alkali metalB. CarbonC. Alkaline earth metalD. Halogens
Answer» Correct Answer - A

Discussion

202.	Ortho and para hydrogen differn inA. proton spinB. Electron spinC. Nuclear chargeD. Nuclear reaction
Answer» Correct Answer - A Ortho and para hydrogen differ in proton spin.

Discussion

203.	(i) Distinguish between ortho and para-hydrogens. (ii) What is the composition of ortho-and para hydrogens in ordinary hydrogen at room temperature ? Can this composition be changed?
Answer» (ii) For effect of temperature on the compostion of ortho and para isomers.

Discussion

204.	Deuterium an isotope of hydrogen is :A. RadioactiveB. Non radioactiveC. HeaviestD. Lightest
Answer» Correct Answer - B

Discussion

205.	Valence factor of `H_(2)O_(2)` is always 2. Statement-2: In redox reaction change of oxidation state per molecule is 2.A. Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1B. Statement-1 is true, statement-2 is true, statement-2 is not correct explanation for statement-1C. Statement-1 is true, statement-2 is falseD. Statement-1 is false, statement-2 is true
Answer» Correct Answer - D

Discussion

206.	Statement-1: Complete hydrolysis of one mole of peroxydisulphuric acid gives one mole of `H_(2)O_(2)` and moles of `H_(2)SO_(4)`. Statement-2: Peroxydisulphuric acid has one peroxy linkage.A. Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1B. Statement-1 is true, statement-2 is true, statement-2 is not correct explanation for statement-1C. Statement-1 is true, statement-2 is falseD. Statement-1 is false, statement-2 is true
Answer» Correct Answer - A

Discussion

207.	`H_(2)SO_(4)` is added to 20% cold aqueous solution of `BaO_(2)`. The product formed is:A. `H_(2)O_(2)`B. BaOC. `Ba(OH)_(2)`D. `H_(2)SO_(5)`
Answer» (a) is the correct answer

Discussion

208.	Ratio of Ortho & Para hydrogen in ordinary hydrogen is :A. `1:3`B. `2:3`C. `3:1`D. None
Answer» Correct Answer - C

Discussion

209.	Ortho- and para-hydrogen differ inA. atomic numberB. mass numberC. electron spin in two atomsD. nuclear spin in two atoms
Answer» Correct Answer - D

Discussion

210.	`H_(2)O_(2)` can act asA. oxidising agentB. Reducing agentC. Bleaching agentD. Acid
Answer» Correct Answer - A::B::C::D

Discussion

211.	The reaction between which of the following reactants produces hydrogen?A. `Zn+HCl`B. `BaO_(2)+HCl`C. `K_(2)S_(2)O_(8)+H_(2)O`D. `Na_(2)O_(2)+HCl`
Answer» Correct Answer - A

Discussion

212.	Water gas isA. `CO+H_(2)`B. `CO_(2)+H_(2)`C. `CO+H_(2)O`D. `CO_(2)+N_(2)`
Answer» Correct Answer - A

Discussion

213.	what is meant by the term “Cold Combustion”? Explain
Answer» In space crafts, H₂ gas is used in fuel cells for generating electrical energy and for providing clean drinking water to the Astronauts’. The electrical energy is generated by the reaction of H₂ and O₂ without evolution of any heat called “Cold combustion” With alkaline electrolyte the half-cell reactions are: H₂+2OH- ---> 2 H₂O+2 eH₂O +1/2 O₂ ----> 2OH- H₂ + ½ O_2- ---> H₂O E⁰ = 1.23 V Efficiency is up to 85% which in rechargeable secondary cells is about 40%.

213.

what is meant by the term “Cold Combustion”? Explain

Answer»

In space crafts, H₂ gas is used in fuel cells for generating electrical energy and for providing clean drinking water to the Astronauts’. The electrical energy is generated by the reaction of H₂ and O₂ without evolution of any heat called “Cold combustion” With alkaline electrolyte the half-cell reactions are:

H₂+2OH- ---> 2 H₂O+2 eH₂O +1/2 O₂ ----> 2OH-

H₂ + ½ O_2- ---> H₂O E⁰ = 1.23 V

Efficiency is up to 85% which in rechargeable secondary cells is about 40%.

Discussion

214.	Name the compound whose electrolysis in aqueous state, give high purity (99.95%) dihydrogen.
Answer» Aqueous Ba(OH)₂ solution

Discussion

215.	Consider the following reversible conversion: Ortho`(H_(2))hArr"Para "(H_(2))` this equilibrium will shift in forward directionA. On increasing temperatureB. On increasing ortho concentrationC. On decreasing temperatureD. On decreasing ortho concentration
Answer» Correct Answer - B::C

Discussion

216.	The catalyst used in the water-gas shift reaction isA. Sodium arseniteB. NickelC. Potassium permanganateD. Iron chromate
Answer» Correct Answer - D

Discussion

217.	How can the production of dihydrogen obtained from coal gasification, be increased?
Answer» The process of producing syngas or synthesis gas from coal is called coal gasification C(s) + H₂O(g) Ni 1270K -------> CO(g) +H₂(g) The production of hydrogen can be increased by reacting carbon monoxide of syngas with the steam in presence of iron chromate as catalyst at 673K. This is called water shift reaction CO (g) +H₂O (g) FeCrO₄, 673K ---------> CO₂ (g) +H₂ (g) The CO₂ thus produced can be removed either by scrubbing with a solution of sodium arsenite or by passing the mixture through water under 30 atm. Pressure when CO₂ dissolves leaving behind H₂ which is collected.

217.

How can the production of dihydrogen obtained from coal gasification, be increased?

Answer»

The process of producing syngas or synthesis gas from coal is called coal gasification

C(s) + H₂O(g) Ni 1270K -------> CO(g) +H₂(g)

The production of hydrogen can be increased by reacting carbon monoxide of syngas with the steam in presence of iron chromate as catalyst at 673K. This is called water shift reaction

CO (g) +H₂O (g) FeCrO₄, 673K ---------> CO₂ (g) +H₂ (g)

The CO₂ thus produced can be removed either by scrubbing with a solution of sodium arsenite or by passing the mixture through water under 30 atm. Pressure when CO₂ dissolves leaving behind H₂ which is collected.

Discussion

218.	Give the main purpose of water gas shift reaction.
Answer» The main purpose of water gas shift reaction is to increase the production of dihydrogen.

Discussion

219.	What is 'coal gasification'.
Answer» Nowadays 'syngas' is produced from sewage, saw-dust, scrap wood,newspapers etc. The process of producing 'syngas' from coal is called 'coal gasification'.

Discussion

220.	If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be ……(a) 1.2 g (b) 2.4 g (c) 3.6 g(d) \(\sqrt{4.8}\, g\)
Answer» (a) 1.2 g Mass of deuterium = 2 × (mass of protium) If all the 1.2 g hydrogen is replaced with deuterium, the weight will become 2.4g. Hence the increase in body weight is (2.4 – 1.2 = 1.2 g).

220.

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be ……(a) 1.2 g (b) 2.4 g (c) 3.6 g(d) \(\sqrt{4.8}\, g\)

Answer»

(a) 1.2 g

Mass of deuterium = 2 × (mass of protium)

If all the 1.2 g hydrogen is replaced with deuterium, the weight will become 2.4g.

Hence the increase in body weight is (2.4 – 1.2 = 1.2 g).

Discussion

221.	Assertion : Permanent hardness of water is removed by treatment with washing soda. Reason : Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates (a) Both assertion and reason are true and reason is the correct explanation of assertion. (b) Both assertion and reason are true but reason is not the correct explanation of assertion. (c) Assertion is true but reason is false (d) Both assertion and reason are false
Answer» (a) Both assertion and reason are true and reason is the correct explanation of assertion. Ca²⁺ + Na₂CO₃ → CaCO₃↓ + 2Na⁺

221.

Assertion : Permanent hardness of water is removed by treatment with washing soda. Reason : Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates (a) Both assertion and reason are true and reason is the correct explanation of assertion. (b) Both assertion and reason are true but reason is not the correct explanation of assertion. (c) Assertion is true but reason is false (d) Both assertion and reason are false

Answer»

(a) Both assertion and reason are true and reason is the correct explanation of assertion.

Ca²⁺ + Na₂CO₃ → CaCO₃↓ + 2Na⁺

Discussion

222.	Statement-I: Permanent hardness of water is removed by treatment with washing soda.Statement-II: Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonate. (a) Statements-I and II are correct and Statement-II is the correct explanation of statement-I. (b) Statements-I and II are correct but Statement-II is not the correct explanation of statement-I. (c) Statement-I is correct but Statement-II is wrong. (d) Statement-I is wrong but Statement-II is correct.
Answer» (a) Statements-I and II are correct and Statement-II is the correct explanation of statement-I.

Discussion

223.	Which one of the following is used as water softener? (a) Zeolites (b) lime (c) washing soda (d) bleaching powder
Answer» (a) Zeolites

Discussion

224.	Hydrogen is1. combustible2. non-combustible3. supporter of combustion4. neither supporter nor combustible
Answer» Hydrogen is combustible.

Discussion

225.	`CO+H_(2)underset(573K//300atm)overset(X("catalayst"))(rarr)CH_(3)OH`, the catalyst X is `:`A. Ferrous sulphateB. `Cr_(2)O_(3)//ZnO`C. `V_(2)O_(5)`D. `Al_(2)O_(3)`
Answer» Correct Answer - B BOSCH process `= underset("water gas")(H_(2)+CO)+underset("stream")(H_(2)O) overset(773K)underset(Fe_(2)O_(3),Cr_(2)O_(3))rarr CO_(2)+2H_(2)`

Discussion

226.	When a substance `A` reacts with water it produces a conbustible gas `B` and a solution of substance `C` in water. When another substance `D` reacts with this soution of `C`, it also produces the same gas `B` on warming but `D` can produce `B` on reaction with dilute sulphuric acid at room temperature. `B` on reaction with dilute sulphuric acid at room tempreture. `A` imparts a golden yellow colour to a smokeless flame of bunsen flame. `A,B,C` and `D` are respectively.A. `Na, H_(2), NaOH, Zn`B. `K,H_(2), KOH, Al`C. `Ca, H_(2),Ca(OH)_(2),Sn`D. `CaC_(2), C_(2)H_(2),Ca(OH)_(2),Fe`
Answer» Correct Answer - a `2Na_((s))+2H_(2)O_(l)rarr 2NaOH_((aq))+H_(2(g))` `(A)` `(C)` `(B)` `Zn_((s))+2NaOH_((aq)) rarr Na_(2)ZnO_(2)+H_(2)(B)` `(D)` `Zn_((s))+H_(2)SO_(4(aq))overset("Room temperature")rarrZnSO_(4(aq))+H_(2)(B)`, `(D)` `Na overset("Burn on nonlumionous flame")rarr`Golden yellow flame

Discussion

227.	The volume strength of `1.5 N H_2O_2` solution isA. `4.8`B. `5.2`C. `8.8`D. `8.4`
Answer» Correct Answer - D Strength =Normality `xxEW` of `H_(2)O_(2)` `=1.5 Nxx1.7 g L^(-1)=25.5 g L^(-1)` `underset(68g)(2H_(2)O_(2))to2H_(2)O+underset(22400 mL "at STP")(O_(2))` 68 g of `H_(2)O gives=22400` mL of `O_(2)`at STP `25.5 g H_(2)O_(2)` gives =`22400/68xx25.5 =8400` mL of `O_(2)` at `STP` `25.5 g` of `H_(2)O_(2) ` is present in `1000 m L` of `H_(2)O_(2)` solution `1000` mL of `H_(2)O_(2)` gives 8400 mL of `O_(2)`at STP 1mL of `H_(2)O_(2)` gives `8400/1000` mL of `O_(2)` at `STP` `=8.4 mL` of `O_(2)` Hence, volume strength of `1.5 N H_(2)O_(2)=8.4` volume. Or mass of `H_(2)O_(2)` in `1.5 N` solution `=EW` of `H_(2)O_(2)xx1.5 N` `=17xx1.5=25.5 g//L` Hence, volume strength of `1.5 N H_(2)O_(2)` solution `=(22.4xx25.5)/68=8.4`

Discussion

228.	Assertion `(A)`: Concentration of `H_2O_2` is expressed in volume. Reason `(R)` :Volume strength = Normality `xx 5.6`.A. If both (A) and (R) are correct and (R) is the correct explanation of (A).B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).C. If (A) is correct, but (R) is incorrect.D. If (A) is incorrect, but (R) is correct.
Answer» Correct Answer - B Both (A) and (R) are correct but(R) is not the correct explanation of (A).

Discussion

229.	The pH of `D_(2)O` and `H_(2)O` at 298 K isA. `70, 70`B. `735, 70`C. `70, 685`D. `685, 735`.
Answer» Correct Answer - B pH of heavy water is slightly more than seven.

Discussion

230.	With the decrease in temperature, the proportion of which allotropic form increasesA. orthoB. paraC. metaD. heavy hydrogen.
Answer» Correct Answer - B With the decrease in temperature,proportion of more stable para hydrogen increases.

Discussion

231.	Sodium forms a crystallisation ionic solid with dihydrogen. The solid is non-conducting in nature. It reacts violently with water to produce dihydrogen gas. Write the formula of this compond and its reaction with water. What will happen on electrolysis of the melt of this solid.
Answer» The available information suggests the cyrstalline solid is sodium hydride (NaH), It is nont volatile due to its crystalline nature and does not conduct electricity in the solid state. `NaH(s)+H_(2)O(aq) to NaOH(aq)+H_(2)(g)` Upon electrolysis , the melt (molten metal hydride) will conduct electricity. `underset("Melt")(NaH(l)) overset("Electrolysis")to underset("Cathode")(Na^(+))+underset("anode")(H^(-))` At cathode: `Na^(+)+e^(-) to Na, "At anode": H^(-) overset(-e)to H or 1//2 H_(2)`.

Discussion

232.	Out of the two allotropic forms of dihydrogen, the form with lesser molecular energy isA. OrthoB. MetaC. ParaD. All have same energy
Answer» Correct Answer - c The para form of `H_(2)O` has lesser energy than the ortho form.

Discussion

233.	Which of the following statements about hydrogen is incorrect ?A. Dihydrogen does not act as a reducing agent.B. Hydrogen has three isotopes of which tritium is the most common.C. Hydrogen never acts as cation in ionic salts.D. Hydronium ion, `H_(3)O^(+)`, exists freely in solution
Answer» Correct Answer - a,b `(a)` and `(b)` options are incorrect Correct `-` Dihydrogen act as reducing agent for example `3overset(0)(H)_(2) +overset(0)(H)_(2) rarr 2 overset(-1+1) (NH)_(3)(` Oxidation no. of `H_(2)` increases `)` Correct `-` Hydrogen has three isotopes of which protium `(._(1)H^(1))` is the most common.

Discussion

234.	I. `H_(2)O_(2) + O_(2) to H_(2)O + 2O_(2)` `II. H_(2)O_(2)+ Ag_(2)O to 2Ag + H_(2)O + O_(2)` Role of hydrogen peroxide in the above reactions is respectivelyA. oxidising in (I) and reducing in (II)B. reducing in (I) and oxidising in (II)C. reducing in (I) and (II)D. oxidising in (I) and (II)
Answer» Correct Answer - C In both these reactions, `H_(2)O_(2)` acts as a reducing agent since it itself is oxidised to `O_(2)`.

Discussion

235.	Which of the following statements is`//`are correct about `6.8%` stregnth of `H_2O_2`.A. its normality is `4N`B. its molarity is `2M`C. Its volume strength is `22.4 V`D. Volume strength `11.2xxM`
Answer» Correct Answer - A::B::C::D a. `1.7%=1N` `6.8%=4N` b. `M=(4N)/2=2M` c. `1.7%=5.6 V` `6.8%=22.4 V` d. volume strength `=5.6xxN` `5.6xx2xxM=11.2M`

Discussion

236.	Hydrogen can react with the following even in dark:A. `I_(2)`B. `Cl_(2)`C. `F_(2)`D. `Br_(2)`
Answer» Correct Answer - C

Discussion

237.	Pure `H_2O_2` isA. semi-solidB. liquidC. solidD. gas
Answer» Correct Answer - B

Discussion

238.	The volume of `10` volume of `H_2O_2` required to liberate `500mL` of `O_2` at `STP isA. `25 mL`B. `50 mL`C. `100 mL`D. `125 mL`
Answer» Correct Answer - B `10` volume `H_(2)O_(2)` means 10 mL of `O_(2)` is produced at `STP` from `1` mL of 10vol `H_(2)O_(2)` Hence `500` mL of `O_(2)` is produce at `STP` from `500/10=50` mL of 10 vol `H_(2)O_(2)`

Discussion

239.	What will be the strength of 20 vol of `H_(2)O_(2)` in terms of gram per litre?A. `60.71 gL^(-1)`B. `5.6 gL^(-1)`C. `30.62 gL^(-1)`D. `17 gL^(-1)`
Answer» Correct Answer - A 20 vol of `H_(2)O_(2)` means : 1 L of this `H_(2)O_(2)` will give 20 L of oxygen at sTP. `underset(2xx34)(2H_(2)O_(2))to underset(22.4" L at STP")(O_(2))+H_(2)O` 22.4 L of `O_(2)` is produced from 68 g of `H_(2)O_(2)` 20 L of `O_(2)` is produced from `=(68xx20)/(22.4)=60.71 g L^(-1)` of `H_(2)O_(2)`.

Discussion

240.	The volume of 10 vol `H_(2)O_(2)` required to liberate 500 `cm^(3)` of `O_(2)` at STPA. 50 mlB. `5*0 ml`C. 15 mlD. 100 ml.
Answer» Correct Answer - A 10 ml of `O_(2)` is obtained at STP from `H_(2)O_(2)=1` ml 500 ml of `O_(2)` is obtained at STP from `H_(2)O_(2)=1//10xx500=50` mL.

Discussion

241.	Do you expect the carbon hydride of the type `(C_(n)H_(2n+2))` to act Lewis acid or base? Justify you answer.
Answer» It is neither a Lewis acid nor a Lewis base. In all the hydrides belonging to this type, the carbon atoms have complete octet. Therefore, these hydrides behave as normal covalent hydrides also called saturated hydrocarbons or alkanes, `(e.g., CH_(4),C_(2)H_(6),C_(3)H_(8)etc)`. These are also called electron precise hydrides. We shall study in details about these hydrides at a later stage in unit 13.

Discussion

242.	The chemical formula for calcium chlorite isA. `Ca(ClO_4)_2`B. `Ca(ClO_3)_2`C. `CaClO_2`D. `Ca(ClO_2)_2`
Answer» Correct Answer - D The formula of calcium chlorite is `Ca(ClO_2)_2`.

Discussion

243.	Hydrogen peroxide can be prepared in the laboratory by the action of dilute acids on metallic peroxide. In one method, sodium peroxide is added in samall amount at a time to a dilute solution of sulphuric acid in cold. Sodium peroxide can be replaced by barium peroxide. In this case, a paste of `BaO_(2).8H_(2)O` is prepared and added gradually to an ice-cold dilute sulphuric acid. Barium sulphate precipitates out leaving behind a dilute solution of hydrogen peroxide. Phosphoric acid can also be used in place of sulphuric acid. Which of the following is used for the preparation of `H_(2)O_(2)`?A. Anhydrous `BaO_(2)`B. Anhydrous `Na_(2)O_(2)`C. `TiO_(2)`D. `PbO_(2)`
Answer» Correct Answer - B

Discussion

244.	When sodium peroxide is treated with dilute sulphuric acid, we get ……… .A. sodium sulphate and waterB. sodium sulphate and oxygenC. sodium sulphate , hydrogen and oxygenD. sodium sulphate and hydrogen peroxide
Answer» Correct Answer - D `Na_(2)O_(2) + "Dil." H_(2)SO_(4) to Na_(2)SO_(4)+ H_(2)O_(2)`.

Discussion

245.	There is a smaple of 10 volume of hydrogen peroxide solution . Calculate its strength.
Answer» 3% `H_(2)O_(2)` solution.

Discussion

246.	Calculate the strength of 30 volume solution of hydrogen peroxide.
Answer» 30 volume solution of `H_(2)O_(2)` means that 1L of this `H_(2)O_(2)` solution will give 30 L of oxygen at STP. The decomposition of `H_(2)O_(2)` takes place as follows. `underset(2xx34g=18g)(2H_(2)O_(2)to 2H_(2)O+underset(22.7L" at STP")(O_(2))` from the equation 22.7 L of `O_(2)` of `O_(2)` at STP is obtained from `H_(2)O_(2)=68g` `therefore30L` of `O_(2)` at STP is obtained from `H_(2)O_(2)=(68)/(22.7)xx30` Therefore, strength of 30 volume `H_(2)O_(2)` solution `=89.86g//L`

Discussion

247.	Write a note on volume strength of hydrogen peroxide.
Answer» A 30 % hydrogen peroxide is marketed as 100 volume H₂O₂ .It means that one mL of 30 % H₂O₂ solution will give 100V of oxygen at STP. Commercially, it is marketed as 10 volume, which means it contains 3% H₂O₂ .

Discussion

248.	Write a note on storage of hydrogen peroxide.
Answer» H₂O₂ decomposes slowly on exposure to light , H₂O₂→ 2H₂O + O₂. In the presence of metal surfaces or traces of alkali, the above reaction is catalyzed . Hence it is stored in wax- lined glass or plastic vessels in dark.

Discussion

249.	Hydrogen accepts an electron to form inert gas configureation, it resmebles `…………………….`A. HalogenB. Alkali metalsC. ChalcogensD. Alkaline earth metals
Answer» Correct Answer - a `underset(1s^(1))(H)+e^(-)rarrunderset(1s^(2)or [He]^(2))(H^(-))` `underset([He]^(2)2s^(2)2p^(5))(F)+e^(-)rarr underset([He]^(2)2s^(2)2p^(6)or [Ne]^(10))(F^(-))`

Discussion

250.	Species or ion which doesnot exist in natureA. `H^(+)`B. `H_(3)O^(+)`C. `H_(2)^(+)`D. 1, 3 both
Answer» Correct Answer - D `H^(+)` ion doesnot exist in nature, because `H^(+)` is without `e^(-)` species of size of `H^(+)` ions is negligible. `h_(2)^(+)` does not exist, because its bond order is `0.5`.

Discussion

Explore topic-wise InterviewSolutions in .

Hydrogen has the tendency to lose one `e^(-)` and for mation of `H^(+)`, In this respect it resembles with :A. Alkali metalB. CarbonC. Alkaline earth metalD. Halogens

Ortho and para hydrogen differn inA. proton spinB. Electron spinC. Nuclear chargeD. Nuclear reaction

(i) Distinguish between ortho and para-hydrogens. (ii) What is the composition of ortho-and para hydrogens in ordinary hydrogen at room temperature ? Can this composition be changed?

Deuterium an isotope of hydrogen is :A. RadioactiveB. Non radioactiveC. HeaviestD. Lightest

`H_(2)SO_(4)` is added to 20% cold aqueous solution of `BaO_(2)`. The product formed is:A. `H_(2)O_(2)`B. BaOC. `Ba(OH)_(2)`D. `H_(2)SO_(5)`

Ratio of Ortho & Para hydrogen in ordinary hydrogen is :A. `1:3`B. `2:3`C. `3:1`D. None

Ortho- and para-hydrogen differ inA. atomic numberB. mass numberC. electron spin in two atomsD. nuclear spin in two atoms

`H_(2)O_(2)` can act asA. oxidising agentB. Reducing agentC. Bleaching agentD. Acid

The reaction between which of the following reactants produces hydrogen?A. `Zn+HCl`B. `BaO_(2)+HCl`C. `K_(2)S_(2)O_(8)+H_(2)O`D. `Na_(2)O_(2)+HCl`

Water gas isA. `CO+H_(2)`B. `CO_(2)+H_(2)`C. `CO+H_(2)O`D. `CO_(2)+N_(2)`

what is meant by the term “Cold Combustion”? Explain

Name the compound whose electrolysis in aqueous state, give high purity (99.95%) dihydrogen.

Consider the following reversible conversion: Ortho`(H_(2))hArr"Para "(H_(2))` this equilibrium will shift in forward directionA. On increasing temperatureB. On increasing ortho concentrationC. On decreasing temperatureD. On decreasing ortho concentration

The catalyst used in the water-gas shift reaction isA. Sodium arseniteB. NickelC. Potassium permanganateD. Iron chromate

How can the production of dihydrogen obtained from coal gasification, be increased?

Give the main purpose of water gas shift reaction.

What is 'coal gasification'.

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be ……(a) 1.2 g (b) 2.4 g (c) 3.6 g(d) \(\sqrt{4.8}\, g\)

Which one of the following is used as water softener? (a) Zeolites (b) lime (c) washing soda (d) bleaching powder

Hydrogen is1. combustible2. non-combustible3. supporter of combustion4. neither supporter nor combustible

`CO+H_(2)underset(573K//300atm)overset(X("catalayst"))(rarr)CH_(3)OH`, the catalyst X is `:`A. Ferrous sulphateB. `Cr_(2)O_(3)//ZnO`C. `V_(2)O_(5)`D. `Al_(2)O_(3)`

The volume strength of `1.5 N H_2O_2` solution isA. `4.8`B. `5.2`C. `8.8`D. `8.4`

The pH of `D_(2)O` and `H_(2)O` at 298 K isA. `7*0, 7*0`B. `7*35, 7*0`C. `7*0, 6*85`D. `6*85, 7*35`.

With the decrease in temperature, the proportion of which allotropic form increasesA. orthoB. paraC. metaD. heavy hydrogen.

Sodium forms a crystallisation ionic solid with dihydrogen. The solid is non-conducting in nature. It reacts violently with water to produce dihydrogen gas. Write the formula of this compond and its reaction with water. What will happen on electrolysis of the melt of this solid.

Out of the two allotropic forms of dihydrogen, the form with lesser molecular energy isA. OrthoB. MetaC. ParaD. All have same energy

Which of the following statements about hydrogen is incorrect ?A. Dihydrogen does not act as a reducing agent.B. Hydrogen has three isotopes of which tritium is the most common.C. Hydrogen never acts as cation in ionic salts.D. Hydronium ion, `H_(3)O^(+)`, exists freely in solution

I. `H_(2)O_(2) + O_(2) to H_(2)O + 2O_(2)` `II. H_(2)O_(2)+ Ag_(2)O to 2Ag + H_(2)O + O_(2)` Role of hydrogen peroxide in the above reactions is respectivelyA. oxidising in (I) and reducing in (II)B. reducing in (I) and oxidising in (II)C. reducing in (I) and (II)D. oxidising in (I) and (II)

Which of the following statements is`//`are correct about `6.8%` stregnth of `H_2O_2`.A. its normality is `4N`B. its molarity is `2M`C. Its volume strength is `22.4 V`D. Volume strength `11.2xxM`

Hydrogen can react with the following even in dark:A. `I_(2)`B. `Cl_(2)`C. `F_(2)`D. `Br_(2)`

Pure `H_2O_2` isA. semi-solidB. liquidC. solidD. gas

The volume of `10` volume of `H_2O_2` required to liberate `500mL` of `O_2` at `STP isA. `25 mL`B. `50 mL`C. `100 mL`D. `125 mL`

What will be the strength of 20 vol of `H_(2)O_(2)` in terms of gram per litre?A. `60.71 gL^(-1)`B. `5.6 gL^(-1)`C. `30.62 gL^(-1)`D. `17 gL^(-1)`

The volume of 10 vol `H_(2)O_(2)` required to liberate 500 `cm^(3)` of `O_(2)` at STPA. 50 mlB. `5*0 ml`C. 15 mlD. 100 ml.

Do you expect the carbon hydride of the type `(C_(n)H_(2n+2))` to act Lewis acid or base? Justify you answer.

The chemical formula for calcium chlorite isA. `Ca(ClO_4)_2`B. `Ca(ClO_3)_2`C. `CaClO_2`D. `Ca(ClO_2)_2`

When sodium peroxide is treated with dilute sulphuric acid, we get ……… .A. sodium sulphate and waterB. sodium sulphate and oxygenC. sodium sulphate , hydrogen and oxygenD. sodium sulphate and hydrogen peroxide

There is a smaple of 10 volume of hydrogen peroxide solution . Calculate its strength.

Calculate the strength of 30 volume solution of hydrogen peroxide.

Write a note on volume strength of hydrogen peroxide.

Write a note on storage of hydrogen peroxide.

Hydrogen accepts an electron to form inert gas configureation, it resmebles `…………………….`A. HalogenB. Alkali metalsC. ChalcogensD. Alkaline earth metals

Species or ion which doesnot exist in natureA. `H^(+)`B. `H_(3)O^(+)`C. `H_(2)^(+)`D. 1, 3 both

The pH of `D_(2)O` and `H_(2)O` at 298 K isA. `70, 70`B. `735, 70`C. `70, 685`D. `685, 735`.