InterviewSolution
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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.
| 451. |
Which type of oxide is water? |
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Answer» H2O is an amphoteric oxide |
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| 452. |
Which out of nascent hydrogen and dihydrogen is more reactive? |
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Answer» Nascent hydrogen (newly bom hydrogen) [H] is more reactive than molecular hydrogen. |
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| 453. |
Which isotope of hydrogen does not have neutron? |
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Answer» 11H does not have neutron. It is called protium or ordinary hydrogen. |
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| 454. |
The radioactive isotope of hydrogen is called--------- and its nucleus contains --------proton and --- --neutron. |
| Answer» Tritium, one and two.... | |
| 455. |
Indicate which of the following statements are true and which are false:(a) Hydrogen molecule is monovalent.(b) The removal of hydrogen from a substance is called reduction.(c) Nitric acid can not be used to prepare hydrogen by its action on active metals ?(d) The reaction between hydrogen and nitrogen to form ammonia is reversible.(e) Zinc can liberate hydrogen from water, acid and alkali solution.(f) Hydrogen is combustible as well as a supporter of combustion.(g) Hydrogen gas is easily liquifiable. |
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Answer» (a) False (b) True (c) False (d) True (e) True (f) False (g) False |
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| 456. |
Hydrogen is `:`A. electropositiveB. electronegativeC. both electropositive as well as electronegativeD. neither electropositive nor electronegative. |
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Answer» Correct Answer - C `HtoH^(+)+e^(-)` `H+e^(-)toH^(-)` |
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| 457. |
Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect ?A. Its tendency to lose an electron to form a cation.B. Its tendency to gain a single electron in its valence shell to attain stable electronic configuration.C. Its low negative electron gain enthalpy value.D. Its small size. |
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Answer» Correct Answer - B Hydrogen resembles halogens as it has similar tendency to gain a single electron to attain stable noble gas configuration. |
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| 458. |
Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect ?A. Its tendency to lose an electro to form a cation.B. Its tendency to gain a single electron in its valence shell to attain stable electronic configuration.C. It low negative electron gain enthalpy value.D. It is small size. |
| Answer» (b) is the most important factor. | |
| 459. |
Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect ?A. Its tendency to lose an electron to from a cationB. Its tendency to gain a single electron in its valence shell to attain stable electronic configurationC. Its low negative electron enthalpy valueD. Its small size. |
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Answer» Correct Answer - B Hydrogen resembles halogens in may respects for which several factors are responsible. The most imporatant is hydrogen like halogenes accepts an electron readily to achieve nearest inert gas configuration. Inspite of the fact that hydrogen, to a certain extent resebles both with alkali metals and holgens. |
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| 460. |
Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect? (a) Its tendency to lose an electron to form a cation. (b) Its tendency to gain an electron to attain stable electronic configuration. (c) Its low negative electron gain enthalpy value. (d) Its small size. |
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Answer» (b) Its tendency to gain an electron to attain stable electronic configuration |
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| 461. |
HCl gas is covalent and NaCl is an ionic compound. This is becauseA. sodium is highly electropositiveB. hydrogen is a non metalC. HCl is a gasD. Electronegativity difference H and Cl is less than 2.1 . |
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Answer» Correct Answer - D A compound is said to be covalent if the electronegativity difference between the combining atoms is less than 2:1. |
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| 462. |
Ionic hydrides are usuallyA. Good conductors of electricity in solid stateB. Stoichiometric compoundsC. VolatileD. Non-crystalline |
| Answer» Correct Answer - B | |
| 463. |
Group 2 hydrides with significant covalent character is/areA. `BeH_(2)`B. `MgH_(2)`C. `CaH_(2)`D. Both 1 and 2 |
| Answer» Correct Answer - D | |
| 464. |
Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH the correct order of increasing ionic character isA. `LiH gt NAH gt CsH gt KH gt RbH`B. `LiH lt NaH lt KH lt RbH lt CsH`C. `RbH gt CsH gt NaH gt KH gt LiH`D. `NaH gt CsH gt RbH gt LiH gt KH` |
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Answer» Correct Answer - B Ionic character increases with the size of the cation as we move down the group. |
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| 465. |
Describe the nature of ionic hydrides. |
| Answer» Ionic hydrides are crystalline, non-volatile and non-conducting in the solid state. | |
| 466. |
Which of the following is correct for hydrogen?A. It can form bonds in +1 as well as -1 oxidation stateB. It is always collected at cathodeC. It has a very high ionization potentialD. It has same electronegativity as halogens. |
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Answer» Correct Answer - A Hydrogen from bonds in 1 and -1 oxidation states. |
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| 467. |
In the following reaction using isotopic `.^(18)O` in `H_(2)O_(2),2MnO_(4)^(-)+3H_(2)O_(2)^(18)to2MnO_(2)+3O_(2)+2H_(2)O+2OH^(-)` isotopic oxygen goesA. Both with `O_(2)`B. Both with `MnO_(2)`C. Both with `OH^(-)`D. One with `O_(2)` and one with `MnO_(2)` |
| Answer» Correct Answer - A | |
| 468. |
`D_(2)O` is used more inA. chemical industryB. nuclear reactorC. pharmaceutical proparationD. insecticide preparation. |
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Answer» Correct Answer - B `D_(2)O` is used as a moderator in nuclear reators. |
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| 469. |
What is heavy water ?A. `H_(2)O^(17)`B. `H_(2)O^(18)`C. `D_(2)O`D. `H_(2)O.` |
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Answer» Correct Answer - C Heavy water is `D_(2)O`. |
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| 470. |
Metallic HydridesA. Are also called interstitial hydridesB. Are non-stoichiometric, being deffcient in hydrogenC. re poor conductors of electricity, exhibit less paramagnetism and have hydrogen as atom and not as a molecular.D. Have all properties given above |
| Answer» Correct Answer - D | |
| 471. |
Which compound/s is/are metallic hydrides?A. KHB. `VH`C. `PH_(3)`D. `TiH_(3)` |
| Answer» Correct Answer - B::D | |
| 472. |
How do you expect the metallic hydrides to be useful for hydrogen storage? Explain. |
| Answer» Metallic hydrides are hydrogen deficient, i.e., they do not hold the law of constant composition. It has been established that in the hydrides of Ni, Pd, Ce, and Ac, hydrogen occupies the interstitial position in lattices allowing further absorption of hydrogen on these metals. Metals like Pd, Pt, etc. have the capacity to accommodate a large volume of hydrogen. Therefore, they are used for the storage of hydrogen and serve as a source of energy. | |
| 473. |
The structure of `H_(2)O_(2)` isA. PlanarB. Non planarC. SphericalD. Linear. |
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Answer» Correct Answer - B Structure of `H_(2)O_(2)` is non-planar. |
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| 474. |
Which of the following is formed by the action of water on sodium peroxide ?A. `H_(2)`B. `N_(2)`C. `O_(2)`D. `CO_(2)`. |
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Answer» Correct Answer - C `2H_(2)O+2Na_(2)O_(2)to4NaOH+O_(2)`. |
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| 475. |
What are X and Y in the above reaction ?A. `RCH_(2)CH_(2)CHOand RCH_(2)CH_(2)CH_(2)OH`B. `RCH_(2)CH_(2)CHOand RCH_(2)CH_(2)OH`C. `CH_(3)CH_(2)CHOand CH_(3)CH_(2)OH`D. `CH_(3)CH_(2)CH_(2)CHOand CH_(3)CH_(2)CH_(2)OH` |
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Answer» Correct Answer - A Hydroformlyation of olefins yields aldehydes which futher undergo reduction to give alcohols . `H_(2) + CO + R CH = CH_(2) to RCH_(2)CH_(2)CHO` `H_(2) + RCH_(2)CH_(2)CHO to RCH_(2)CH_(2)CH_(2)OH` |
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| 476. |
Dilydrogen is used the I. manufacturing of nitric acid and nitrogenous fertillisers. II. Manufacturing of vanaspati fat. III. Manufacturing of methanol. IV. Perparartion of hydrogen choride. Choose the correct option .A. I, II and IVB. II, III and IVC. I,II and IIID. I,II,III and IV |
| Answer» Correct Answer - D | |
| 477. |
Metals of groups 7, 8 and 9 do not form metallic hydrides. This is termed asA. hydride gapB. hydride shiftC. anhydrideD. dehydride. |
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Answer» Correct Answer - A |
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| 478. |
Name the groups in d-block elements which do not form metallic hydrides. |
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Answer» Groups 7, 8 and 9 in d-block elements do not form metallic hydrides. |
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| 479. |
which of the following will not disolace hydrogen ?A. BaB. PbC. HgD. Sn. |
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Answer» Correct Answer - C Mercury (Hg) will not displace hydrogen. |
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| 480. |
Mass precentage of deuterium in heavy water isA. same as that of protium in waterB. 20C. `11*1`D. unpredictable. |
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Answer» Correct Answer - B Molar mass of `D_(2)O` in 20g `mol^(-1)`. `% "of D"=(4xx100)/(20)=20%` |
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| 481. |
The absorption of hydrogen by palladium is calledA. HydrationB. ReductionC. OcclusionD. Hydrogenation. |
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Answer» Correct Answer - C Absorption of `H_(2)` by palladium is called occlusion. |
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| 482. |
Which will produce hard water ?A. Saturation of water with `CaSO_(4)`B. Addition of `NaSO_(2)` to waterC. Saturation of water with `CaCO_(3)`D. Saturation of water with `MgCO_(3)` |
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Answer» Correct Answer - a A |
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| 483. |
`30-`volume hydrogen peroxide meansA. `30 %` of `H_(2)O_(2)` by volumeB. `30 g` of `H_(2)O_(2)` solution contains `1g` of `H_(2)O`C. ` 1 cm^(3)` of solution liberates `30 cm^(3)` of dioxygen gas at STPD. `1 cm^(3)` of solution liberate `30 cm^(3)` of dioxygen gas at `STP` |
| Answer» Correct Answer - C | |
| 484. |
Which of the following metal does not produce dihydrogen gas with dilute hydrochloric acid?A. `Mg`B. `Zn`C. `Ag`D. `Ba` |
| Answer» Correct Answer - C | |
| 485. |
Temporary harness of water of due to the presence ofA. `MgSO_(4)`B. `Mg(HCO_(3))_(2)`C. `CaCl_(2)`D. `CaCO_(3)` |
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Answer» Correct Answer - b Temporary hardness of water is due to the presence of `Ca(HCO_(3))_(2)` and `Mg(HCO_(3))_(2)` in water |
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| 486. |
Assertion. Electrolysis of molten `CaH_(2)` produces hydrogen gas at anode. Reason. In `CaH_(2)` hydrogen is present in the form of hydride `H^(-)`. |
| Answer» Correct Answer - A | |
| 487. |
Match the terms in Column I with the relevant item in Column II.Column IColumn II(i) Electrolysis of water produces(a) atomic reactor(ii) Lithium aluminium hydride is used as(b) polar molecule(iii) Hydrogen chloride is a(c) recombines on metal surface to generate high generate high(iv) Heavy water is used in(d) reducing agent(v) Atomic hydrogen(e) hydrogen and oxygen |
| Answer» (i) → (e) (ii) → (d) (iii) → (b) (iv) → (a) (v) → (c) | |
| 488. |
When hard water is passed through ion exchange resin with formula `RNH_(3)^(+)OH^(-)` it becomes free fromA. `Ca^(2+)ion`B. all cationsC. all anionsD. all types of ions. |
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Answer» Correct Answer - C The anions present are exchanged with `OH^(-)` ions. |
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| 489. |
Write the names of the three isotopes of hydrogen. What is the mass ratio of thse isotopes? |
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Answer» The three isotopes of hydrogen are: protinum `(._(1)^(1)H)`, deutrium `(._(1)^(2)H or D)` and tritium `(._(1)^(3)H or T)`. Mass ratio of the three isotopes is: `(._(1)^(1)H):(._(1)^(2)H):(._(1)^(3)H)::1.008:2.014::3.016 or 1:2:3` |
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| 490. |
Name the hydrides which have high potential for hydrogen storage. |
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Answer» Metallic hydrides have high potential for hydrogen storage. |
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| 491. |
Give an example of electron deficient covalent hydride. |
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Answer» Diborane (B2H6 ) is an electron deficient covalent |
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| 492. |
What is the behavioral similarity between NH3, H2O HF compounds? |
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Answer» They behave as Lewis is bases i.e. electron donors. The presence of lone pairs on highly electronegative atoms like N, O and F in hydrides results in hydrogen bond formation between the molecules. |
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| 493. |
Give an example of electron – deficient hydride. |
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Answer» The diborane. |
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| 494. |
What is understood by hydrogenation? |
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Answer» Hydrogenation is used for the conversion of polyunsaturated oils into edible fats. |
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| 495. |
What happens when water is added to calcium hydride? |
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Answer» Calcium hydroxide is formed Ca H2 + H2 O → Ca (OH)2 (Calcium hydride) Calcium hydroxide |
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| 496. |
Which fuel is used as a rocket fuel? |
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Answer» Dihydrogen is used as a rocket fuel in space research. |
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| 497. |
Give an example of each of an ionic hydride and a covalent hydride. |
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Answer» Ionic hydride: LiH, NaH Covalent hydride CH4, NH3 and H2O |
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| 498. |
What are hydrides? |
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Answer» Dihydrogen under certain reaction conditions combines with almost all elements, except noble gases, to form binary compounds, called hydrides. |
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| 499. |
Name the categories into which hydrides are categorized. |
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Answer» The hydrides are classified into three categories - (i) Ionic or saline or salt like hydrides. (ii) Covalent or molecular hydrides (iii) Metallic or non-stoichiometric hydrides. |
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| 500. |
Classified the categories of hydrides. |
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Answer» The hydrides are classified into three categories : (i) Ionic or saline or saltlike hydrides (ii) Covalent or molecular hydrides (iii) Metallic or non-stoichiometric hydrides |
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