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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 751. |
Hydrides of elements of group 3 to 5 are generally calledA. Interstitial hydridesB. Ionic hydridesC. Polymeric hydridesD. Complex hydrides. |
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Answer» Correct Answer - A Hydrides of elements of groups 3 to 5 are generally called as interstitial hydrides. |
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| 752. |
Bleaching action of `H_(2)O_(2)` is due to its ………. Nature. |
| Answer» Correct Answer - oxidising | |
| 753. |
With the help of suitable examples, explain the property of `H_(2)O_(2)` that is responsible for its bleaching action ? |
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Answer» Bleaching action of `H_(2)O_(2)` is because of oxidation. `H_(2)O_(2) to H_(2)O _(O)` `"Colouring matter"(O) to "Colorless matter"` It is normally used as a hair bleach. Almost all the hair dyes contain hydrogen perioxide as one of their constituents. |
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| 754. |
For binary hydrides hydrides of formula `MX_(n)`, the value of n can be fractional forA. salt like hydridesB. interstitial hydridesC. covalent hydridesD. Polymeric hydride. |
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Answer» Correct Answer - B Interstitial hydrides are non-stoichiometric hydrides. |
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| 755. |
The structure of hydrogen peroxide molecule isA. linearB. half open book likeC. closed book likeD. cyclic. |
| Answer» Correct Answer - B | |
| 756. |
Write the Lewis structure of hydrogen peroxide . |
| Answer» `H:overset(..)underset(..)O:overset(..)underset(..)O:H` | |
| 757. |
Why is water molecule polar? |
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Answer» Due to difference in electronegativity between O and H and angular shape. |
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| 758. |
Write redox reaction between fluorine and water. |
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Answer» 2F2(g) + 2H2O(l) → 4H–(aq) + 4F–(aq) + O2 |
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| 759. |
Name the following:(a) Two metals which give hydrogen with cold water.(b) A metal which liberates hydrogen only when steam is passed over red hot metal.(c) The process in which oxygen is added or hydrogen is removed.(d) A metallic oxide which can be reduced into metal by hydrogen. |
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Answer» (a) Sodium (Na) and Potassium (K) give hydrogen with cold water. (b) Iron (c) Oxidation (d) Copper oxide (CuO) |
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| 760. |
Metal which does not react with cold water but evolves `H_(2)` with steam is `:`A. NaB. KC. PtD. Fe. |
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Answer» Correct Answer - D Iron (Fe) does not reacts with steam to give `H_(2)`. However, iron with steam to give `H_(2)`. |
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| 761. |
In alkaline medium, `H_(2)O_(2)` reacts with `Fe^(3+)` and `Mn^(2+)` respectively to giveA. `Fe^(4+) , and Mn^(4+)`B. `Fe^(2+) and Mn^(2+)`C. `Fe^(2+) and Mn^(4+)`D. `Fe^(4+) and Mn^(2+)` |
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Answer» Correct Answer - C The maximum O.S. of Fe is +3 , therefore, `Fe^(3+)` can only be reduced by `H_(2)O_(2)`. In contrast , the minimum stable O.S. of Mn is +2 , therefore can be further oxidised by `H_(2)O_(2)` to + 4 oxidation state. In other words, in alkaline medium, `H_(2)O_(2)` . reduces `Fe^(3+)` to `Fe^(2+)` but is oxidises `Mn^(2+)` to `Mn^(4+)` Thus, option (c) is correct. |
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| 762. |
in alkaline medium, `H_(2)O_(2)` reacts with `Fe^(3+)` and `Mn^(@+)` respectively to give `:`A. `Fe^(4+) and Mn^(4+)`B. `Fe^(2+) and Mn^(2+)`C. `Fe^(2+) and Mn^(4+)`D. `Fe^(4+) and Mn^(2+)`. |
| Answer» Correct Answer - C | |
| 763. |
Statement-1:Decomposition of `H_(2)O_(2)` is a dispoportionation reaction. Statement-2:`H_(2)O_(2)` undergoes simultaneous oxidation and reduction reactions. |
| Answer» (a) Statement-2 is the correct explantion for statement-1 | |
| 764. |
Which of the following undergoes reduction with `H_(2)O_(2)` in an alkaline medium ?A. `Mn^(2+)`B. `HOCl`C. `PbS`D. `Fe^(2+)` |
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Answer» Correct Answer - b `HOCl+H_(2)O_(2)overset(AlK.)underset(med.)rarr HCl+H_(2)O+O_(2)` |
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| 765. |
In the reaction. `H_(2)S+H_(2)O_(2) rarr S+2H_(2)O`A. `H_(2)S` is an and `H_(2)O_(2)` is a baseB. `H_(2)S` is a base and `H_(2)O_(2)` is an acidC. `H_(2)S` is an oxidizing agent and `H_(2)O_(2)` is a reducing agentD. `H_(2)S` is a reducing agent and `H_(2)O_(2)` is an oxidising agent |
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Answer» Correct Answer - D Oxidation `underset("Reducing agent")overset(-2)(H_(2)S)+underset("-1 Oxidising agent ")(H_(2_(-))O_(2))underset("Reduction")rarroverset(0)(S)+underset(-2)(2H_(2_(-))O)` |
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| 766. |
Decomposition of `H_(2)O_(2)` is retarded by : `2H_(2)O_(2)(l) rarr 2H_(2)O(l)+O_(2)(g)`A. traces of acidsB. acetanilideC. finely divided metalsD. alcohols |
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Answer» Correct Answer - b |
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| 767. |
Decomposition of `H_(2)O_(2)` is accelerated byA. Traces of acidsB. AcetanilideC. Finely divided metalsD. Alcohol |
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Answer» Correct Answer - C `H_(2)O_(2)=`oxidation in acidic medium is generally show while rapid in alkaline solution. |
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| 768. |
The structure of `H_(2)O_(2)` isA. planarB. non`-` planarC. sphericalD. linear |
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Answer» Correct Answer - B B |
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| 769. |
Hydrogen peroxide was first time prepared byA. PriestleyB. ThenardC. Gay-LussacD. Bernard |
| Answer» Correct Answer - B | |
| 770. |
In lab `H_(2)O_(2)` is prepared byA. Cold `H_(2)SO_(4)+BaO_(2)`B. `HCl+BaO_(2)`C. Conc. `H_(2)SO_(4)+Na_(2)O_(2)`D. `H_(2)+O_(2)` |
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Answer» Correct Answer - a `H_(2)SO_(4)+BaO_(2)rarr BaSO_(4)+H_(2)O_(2)` |
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| 771. |
One of the following is an incorrect statement, point it out.A. Permanent hardness can be removed by boiling waterB. hardness of water effects soap consumptionC. Temporary hardness is due to bicarbonates of Ca and MgD. Permanent hardness is due to the soluble `SO_(4)^(2), Cl^(-)` of Ca and Mg |
| Answer» Correct Answer - A | |
| 772. |
Hydrogen peroxide is :-A. liquidB. gasC. solidD. semi-solid |
| Answer» Correct Answer - A | |
| 773. |
`H_(2)O_(2)rarr 2H^(+)+O_(2)+2e^(-),E^(@)=-0.68V`. This equation represents which of the following behaviour of `H_(2)O_(2)`A. reducingB. oxidisingC. basicD. catalytic |
| Answer» Correct Answer - A | |
| 774. |
`H_(2)O_(2)rarr 2H^(+)+O_(2)+2e^(-),E^(@)=-0.68V`. This equation represents which of the following behaviour of `H_(2)O_(2)`A. ReducingB. OxidisingC. AcidicD. Catalytic |
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Answer» Correct Answer - a As `H_(2)O_(2)` is losing electrons so it is acting as reducing agent. |
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| 775. |
`H_(2)O_(2)` can be obtained when following reacts with `H_(2)SO_(4)` excepts withA. `PbO_(2)`B. `BaO_(2)`C. `Na_(2)O_(2)`D. `SrO_(2)` |
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Answer» Correct Answer - a `BaO_(2)+` dil. `H_(2)SO_(4) rarr BaSO_(4)+H_(2)O_(2)` `Na_(2)O_(2)+` dil. `H_(2)SO_(4) rarr Na_(2)SO_(4)+H_(2)O_(2)` `SrO_(2)+`dil. `H_(2)SO_(4) rarrSrSO_(4)+H_(2)o_(2)` `PbO_(2)+` dil`H_(2)SO_(4) rarr PbSO_(4)+H_(2)O+(1)/(2)O_(2)uarr` `PbO_(2)+H_(2)SO_(4)` cannot give `H_(2)O_(2)` , instead of it gives `H_(2)O+(1)/(2) uarr`. |
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| 776. |
`H_(2)O_(2)` is used but not as:A. oxidant, reductantB. bleaching agentC. antisepticD. catalyst |
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Answer» Correct Answer - D do not act as catalyst. |
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| 777. |
`H_(2)O_(2)` can be obtained when following reacts with `H_(2)SO_(4)` excepts withA. `PbO_(2)`B. `BaO_(2)`C. `Na_(2)O_(2)`D. `KO_(2)` |
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Answer» Correct Answer - A `PbO_(2)rarr"Lead oxide"` Peroxides & superoxides produces `H_(2)O_(2)` with `H_(2)SO_(4)` |
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| 778. |
In which of the following reactions `H_(2)O_(2)` acts as a reducing agent ?A. `H_(2)O_((l)) + NH_(3(aq)) hArr OH_((aq))^(-) + NH_(4(aq))^(+)`B. `H_(2)O_((l)) + H_(2)S_((aq)) hArr H_(3)O_((aq))^(+) + HS_((aq))^(-)`C. `H_(2)O_((l)) + H_(2)O_((l)) hArr H_(3)O_((aq))^(+) + OH_((aq))^(-)`D. `H_((aq))^(+) + OH_((aq))^(-) hArr H_(2)O_((l))` |
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Answer» Correct Answer - A `H_(2)O` acts as a Bronsted acid and gives a proton to react with a base. `underset("acid")(H_(2)O)+underset("base")(NH_(3))hArr OH^(-)+NH_(4)^(+)` In `underset("base")(H_(2)O)+underset("acid")(H_(2)S)to H_(3)O^(+)+HS^(-), H_(2)O` acts as a base with `H_(2)S`. |
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| 779. |
In which of the following reactions, `H_(2)O_(2)` acts as a reducing agent ? (i) `H_(2)O_(2) + 2H^(+) + 2e^(-) to 2H_(2)O` (ii)` H_(2)O_(2) -2e^(-) to O_(2) + 2H^(+)` (iii) `H_(2)O_(2)+ 2e^(-) to 2OH^(-)` (iv) `H_(2)O_(2) + 2OH^(-) 2e^(-) to O_(2) + 2H_(2)O`A. (ii) and (iv)B. (i) and (ii)C. (iii) and (iv)D. (i) and (iii) |
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Answer» Correct Answer - A `O_(2)` is evolved in reactions agent, `O_(2)` is always produced , i.e., option (d) is correct |
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| 780. |
In which of the following reactions `H_(2)O_(2)` acts as reducing agent? `(I) H_(2)O_(2)+2H^(+)+2e^(-) to 2H_(2)O` `(II) H_(2)O_(2)-2e^(-) to O_(2)+2H^(+)` `(III) H_(2)O_(2)+2e^(-) to 2OH^(-)` `(IV) H_(2)O_(2)+2OH^(-)-2e^(-) to O_(2)+2H_(2)O` |
| Answer» (d) `H_(2)O_(2)` acts as a reducing agent in both these reactions. | |
| 781. |
In which of the following reactions `H_(2)O_(2)` acts as reducing agent?A. `H_(2)O_(2)+SO_(2) to H_(2)SO_(4)`B. `2Kl+H_(2)O_(2) to 2KOH+I_(2)`C. `PbS+4H_(2)O_(2) to PbSO_(4)+4H_(2)O`D. `Ag_(2)O+H_(2)O_(2) to 2Ag+H_(2)O+O_(2)` |
| Answer» (d) `Ag_(2)O` is reduced to Ag | |
| 782. |
Order of bond length can be given asA. `H_(2)=D_(2)=T_(2)`B. `H_(2) lt D_(2) lt T_(2)`C. `H_(2)gtD_(2)gtT_(2)`D. `D_(2)ltH_(2)ltT_(2)` |
| Answer» Correct Answer - C | |
| 783. |
Incorrect among the followingA. `H^(+)` exist in water as `H^(+)(H_(2)O)_(n)`B. `H^(-)` exist in water as `H^(-)(H_(2)O)_(n)`C. `Delta_(hyd)H_((H^(+)))^(Theta)=Delta_(hyd)H_((H^(-)))^(Theta)`(hyd`-=`hydration)D. H exist in water as `H.(H_(2)O)_(n)` |
| Answer» Correct Answer - C::D | |
| 784. |
Not incorrect among the followingA. `N_(2)&H_(2)` are two non-reacting gasesB. `O_(2)&H_(2)` are two non-reacting gasesC. `N_(2)&D_(2)` are reactive towards each otherD. `D_(2)&O_(2)` are non-reactive to each other |
| Answer» Correct Answer - C | |
| 785. |
For which `Delta_(f)H^(Theta)` is zero?A. `H`B. `H^(-)`C. `H^(+)`D. `H^(+)(aq)` |
| Answer» Correct Answer - D | |
| 786. |
Correct regarding bond-strength isA. `C-H gt C-D gt C-T`B. `C-H lt C-D lt C-T`C. `C-T lt C-D = C-H`D. `C-D gt C-H =C-T` |
| Answer» Correct Answer - B | |
| 787. |
Water obtained from hand pump and used for drinking purposes in rural area isa) Distilled waterb) Hard waterc) Heavy waterd) Soft water |
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Answer» b) Hard water |
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| 788. |
In what ratio is nitrogen and hydrogen required to form ammonia? |
| Answer» Correct Answer - `1:3` | |
| 789. |
Water acts as a/an _____when it reacs with ammonia. |
| Answer» Correct Answer - Acid. | |
| 790. |
Pure hydrogen is obtained by electrolysis of(a) Water containing Sulphuric acid(b) Water containing NaOH(c) Ba(OH)2(d) Water containing KOH |
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Answer» The answer is (c) Ba(OH)2 |
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| 791. |
Which of the following is not a property of hydrogen peroxide?(a) Reducing agent(b) Oxidising agent(c) Dehydration(d) Bleaching agent |
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Answer» (c) Dehydration |
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| 792. |
Molecular mass of heavy water is(a) 10(b) 12(c) 18(d) 20 |
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Answer» The answer is (d) 20 |
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| 793. |
Which of the following statements is not correct regarding hydrogen:A. Hydrogen show + 1 and -1 oxidation states.B. Hydrogen is never liberated at anode.C. Hydrogen has same ionisation enthalpy as that of alkali metals.D. Hydrogen has same electronegativity as that of halogens. |
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Answer» Correct Answer - A Hydrogen has + 1 oxidation state in compounds with more electronegative elements e.g. HF. It has - 1 oxidation state in compounds with more electropositive compounds like NaH. |
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| 794. |
Fluorine decomposes cold water to giveA. `4H^(+) + 4F^(-)` and `O_(2)`B. HF and `H_(2)`C. HF onlyD. `H_(2)F_(2)` and `HFO_(4)` |
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Answer» Correct Answer - A `2F_(2)+2H_(2)O to 4H^(+)+4F^(-)+O_(2)` |
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| 795. |
Which of the following hydrides is electron deficient ?A. NaHB. `CaH_(2)`C. `CH_(4)`D. `B_(2)H_(6)` |
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Answer» Correct Answer - D `B_(2)H_(6)` is electron deficient hydride. |
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| 796. |
What are electron deficient hydrides? Give examples. |
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Answer» An electron deficient hydride has few electrons for writing its conventional Lewis structure. EX: B2H6 |
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| 797. |
What are covalent hydrides? Give examples. |
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Answer» These are hydrides in which hydrogen is covalently bonded to other elements. P-block elements generally form covalent hydrides .The molecules are held by weak vanderWaals force of attraction. EX:NH3, H2O, PH3 |
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| 798. |
What are ionic hydrides? Give examples |
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Answer» These are stoichiometric compounds of dihydrogen formed with most of the s-block elements which are highly electropositive in character. Elements of group 1 and 2 except lighter metals like Li, Be and Mg will form hydrides . EX: NaH , KH, RbH etc |
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| 799. |
What are hydrides? Give the classification of hydrides. |
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Answer» Binary compounds of hydrogen are Called hydrides. Hydrides are classified into three types namely Ionic hydrides or saline hydrides, Covalent hydrides or molecular hydrides and metallic hydrides or interstitial hydrides. |
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| 800. |
What is water gas? What is the use of it? |
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Answer» The mixture of CO and H2 is called water gas .The mixture is used for the synthesis of methanol and number of hydrocarbons. |
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