Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Between -NO_(2) and -Br, which one of these is a meta directing group? Write equation for the conversion of Benzene into p-Bromonitrobenzene.

Answer»

SOLUTION :NO2 is METAL DIRECTING GROUP
Discussion
2.

Between O_(2) and O_(2)^(-) which one has higher bond order?

Answer»


ANSWER :O2 has higher bond order than `O_(2)^(-)`
Discussion
3.

Between O2 and,O_(2)^(+) which one has higher bond order?

Answer»


ANSWER :`O_(2)^(+)`
Discussion
4.

Between Na^(+) and Ag^(+) which is stronger Lewis acid and why ?

Answer»

Solution :`AG^(+)`. This is because `Ag^(+)` has a pseudo boble gas configuration and HENCE has GREATER POLARIZING POWER.
Discussion
5.

Between Na^(+) and Ag^(+), which is a stronger Lewis acid and why?

Answer»

SOLUTION :`AG^(+)` because `Ag^(+)` has pseudo noble GAS CONFIGURATION which makes it more polarising and therefore STRONGER acid.
Discussion
6.

Between LiCl and NaCl, LiCl is soluble in Ethanol but NaCl does not give reason.

Answer»

Solution :Because LICL is covalent compound HENCE DISSOLVES in organic solvent (Ethanol) but NACL is IONIC compound hence insoluble in ethanol.
Discussion
7.

Between H_(2)S and H_(2)O, H_(2)O is more polar. Why?

Answer»

SOLUTION :Because OXYGEN is more ELECTRONEGATIVE than SULPHUR.
Discussion
8.

Between Cl^- and OH^- which is stronger base ?

Answer»

Solution :`underset"Strong Acid"(HCl_((AQ)))+H_2O_((l)) HARR H_3O^(+)+ underset"weak base"(CL^-)`
`underset"weak acid"(H_2O) hArr H^(+) underset(THEREFORE "Strong base")underset"conjugate base"(OH^-)`
`OH^-` is strong base than `Cl^-`
Conjugate base of strong acid HCl is weak .
Discussion
9.

Between Co and CO_(2), which diffuses faster?

Answer»


ANSWER :CO DIFFUSES FASTER.
Discussion
10.

Between ay two of the following molecules, hydrogen bonding is not possible

Answer»

Two PRIMARY AMINE molecules
Two secondary amine molecules
Two tertiary amine molecules
Two AMMONIA molecules

ANSWER :C
Discussion
11.

Between any two of the following molecules, hyddrogen bonding is not possible

Answer»

TWO PRIMARY amine molecules
Two secondary amine molecules
Two tertiary amine molecules
Two ammonia molecules

Answer :C
Discussion
12.

Between AlCl_(3)andAlF_(3) which is covalent?

Answer»

SOLUTION :`AlCl_(3)`
Discussion
13.

beta- keto acids readily undergo decarboxylation on heating

Answer»
Discussion
14.

Best reagent for nuclear iodination of aromatic compound is :

Answer»

`I_(2)//CH_(3)CN`
`I_(2)//HNO_(3)`
`KI//CH_(3)COCH_(3)`
`KI//CH_(3)COOH`

ANSWER :d
Discussion
15.

Best nucleophile in polar aprotic solvent is

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`F^(-)` <BR>`CL^(-)`
`Br^(-)`
`I^(-)`

ANSWER :A
Discussion
16.

Best nucleophile in polar protic solvent is

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`F^(-)` <BR>`CL^(-)`
`Br^(-)`
`I^(-)`

ANSWER :D
Discussion
17.

Best method to prepare trans-2methylcyclohexanol from 1-methyl-cyclohexene is

Answer»

ADDITION of water in the presence of dil. `H_(2)SO_(4)`
hydroboration oxidation reaction
oxymercuration demercuration reaction
None of these

Solution :In hydroboration oxidation reaction, the addition of water is syn. MARKOWNIKOFF and without any REARRANGEMENT. As H and OH are syn and the `-CH_(3)` and `-OH` in the prodict formed are anti giving a trans product.
Discussion
18.

Best leaving group is

Answer»

`F^(-)` <BR>`CL^(-)`
`Br^(-)`
`I^(-)`

ANSWER :D
Discussion
19.

BeSO_4 is soluble in water whereas BaSO_4 is not. Why?

Answer»

SOLUTION :The greater hydration enthalpies of `Be^(2+)` and `Mg^(2+)` ions OVERCOME the LATTICE enthalpy factor and therefore their SULPHATES are soluble in WATER
Discussion
20.

BeSO_(4) is soluble in water whereas BaSO_(4) is not. Why ?

Answer»


Answer :`K_(H)` is a empircal with the dimensions of pressure. The VALUE of `'K_(H)'` depends on the nature of the GASEOUS SOLUTE and solvent.
Discussion
21.

Besides CO_2 the other greenhouse gas is .......

Answer»

SOLUTION :`CH_(4)`
Discussion
22.

Beryllium shows diagonal relationship with aluminium. Which one of the following similarity is not correct?

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`Be_(2)C` like `AIC_(3)` yields methane on hydrolysis
Be like AI is rendered passive by `HNO_(3)`
Be `(OH)_(2)` like `AI(OH)_(3)` is basic
Be forms beryllates and AI forms aluminates

Solution :`BA(OH)_(2)` does not exists
Discussion
23.

Beryllium shows diagonal relationship with aluminium. Which of the following similarly is incorrect?

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Na
B
AL
K

Solution :Al
Discussion
24.

Beryllium resembles the following element more than the members of its own family

Answer»

`Mg`
`AL`
`Li`
`Si`

ANSWER :B
Discussion
25.

Beryllium resembles aluminium closly in the prperties though it belongs to a different group.

Answer»


SOLUTION :Diagnoal RELATIONSHIP between `be` and `AL`.
Discussion
26.

Beryllium powder on combustion brightly in air and gives ...... and .......

Answer»

SOLUTION :BEO and `Be_(3)N_(2)`
Discussion
27.

Beryllium oxide is.......

Answer»

Acidic
Basic
Neutral
Amphoteric

Answer :D
Discussion
28.

Beryllium hydroxide on soluble in alkali gives ....... and ......

Answer»

SOLUTION :beryllate ION `[Be(OH)_(4)]^(2-)`
Discussion
29.

Beryllium hydroxide dissolves in excess of alkli to give

Answer»

`[Be(OH)_(2)]^(-)`
`[Be(OH)_(2)]^(-2)`
`[Be(OH)_(4)]^(-2)`
`[Be(OH)_(4)]^(3-)`

Answer :C
Discussion
30.

Beryllium hydride and magnesium hydride are covalent and polymeric.

Answer»


ANSWER :T
Discussion
31.

Beryllium halides are covalent whereas magnesium halides are ionic. Why?

Answer»

SOLUTION :D ue to small size of `Be^(2+)`, the charge density is very high. According to Fajan's RULE, cation with small size has high polarising power and prefers to form COVALENT bonds. So BERYLLIUM HALIDES are Covalent in nature.
Discussion
32.

Beryllium chloride shows acidic nature in water or why BeCl_(2) is easily hydrolysed?

Answer»

Solution :`BeCl_(2)` is salt of week base `Be(OH)_(2)` and strong ACID `HCL` and thus undergoes hydrolysis to result in an acidic solution in WATER
`BeCl_(2)+H_(2)O OVERSET("hydration")(rarr) [Be(H_(2)O)_(2)]^(2+)+2Cl^(-)`
Beryllium chloride is acidic when dissolved in pure water because the hydrated IONS hydrolyses producing `H_(3)O^(+)`. the `Be^(2+)` ions are easily hydrated first because of high charge-size ratio. the hydrolysis happens because the `Be-O` bond is very strong and so in the hydrated ion this weakens the `O-H` bonds hence there is a tendency to lose protons.
`[Be(H_(2)O)]^(2+)+H_(2)O overset("hydration")(rarr) [Be(H_(2)O)_(3)OH]^(+)+H_(3)^(+)O`
Discussion
33.

Berylliumcarbideon hydrolysisgives_____

Answer»

METHANE
ETHANE
BERYLLIUM
CARBONDIOXIDE

ANSWER :A
Discussion
34.

Beryllium can be used to store nitric acid. It is due to .....

Answer»

it is passive TOWARD nitric acid.
it has TWO electrons in VALANCE shell.
it has diagonal relationship with Mg.
it is an ALKALINE earth metal.

Answer :A
Discussion
35.

Beryllium and magnesium do not impart colour to bunsen flame. Why?

Answer»

Solution :It is because both Be and Mg havef realatively HGH IONIZATION ENTHALPY. The energy of the BUNSEN FLAME is not sufficient to casue excitation of electrons.
Discussion
36.

Beryllium and magnesium to not give colour to flame whereas other alkaline earth metals do so. Why ?

Answer»

Solution :Due to HIGH ionisation ENTHALPIES of Be and Mg, the valence electrons in these elements are too strongly bound to get excited by a Bunsen burner flame. HENCE, these elements do not impart any colour to the flame. The ionisation enthalpies of other alkaline earth metals are smaller and their electrons are easily excited to higher energy levels by the flame. Therefore, they give CHARACTERISTIC COLOURS to the flame.
Discussion
37.

Beryllium & magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?

Answer»

SOLUTION :Due to smaller size, valence ELECTRONS of Be and Mg are more tightly held by the nucleus. Therefore, they need a large amount of energy for the excitation of their valence electrons to higher energy levels. SINCE such a large amount of energy is not available from bunsen flame, these two metals do not IMPART any colour to the flame.
Discussion
38.

Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so . Why ?

Answer»

Solution :Because of the small size , the ionization enthalpies of Be and Mg are much higher than those of other ALKALINE earth metals . Therefore , they need large amount of energy for excitation of their VALENCE electrons to higher energy levels . Since such a large amount of energy is not available in Bunsen FLAME , therefore , these metals do not impart any COLOUR to the flame .
Discussion
39.

Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in....

Answer»

exhibiting MAXIMUM COVALENCY in compound.
exhibiting AMPHOTERIC nature in their compounds.
forming COVALENT halides.
forming polymeric hydrides.

Answer :A
Discussion
40.

Be(OH)_(2)is amphoteric in nature. Prove it.

Answer»

Solution :`Be(OH)_(2)` is amphoteric in NATURE as it REACTS with both acid and alkali,
`underset(ACIDIC)(Be(O)H)_(2)+2NaOHtoNa_(2)BeO_(2)+2H_(2)O`
`underset(Basic)(Be)(OH)_(2) + 2HCL toBeCl_(2) + 2H_(2)O`
Discussion
41.

Be(OH)_2 is amphoteric in nature. Prove it.

Answer»

SOLUTION :`Be(OH)_2` is amphoteric in nature as it reacts with both acid and alkali.
`UNDERSET(ACIDIC)(Be(OH)_2) + 2NaOH to Na_2BeO_2 + 2H_2O`
`OVERSET(Basic)(Be(OH)_2) + 2HCI to BeCl_2 + 2H_2O`
Discussion
42.

Be(OH)_(2)+2HCl+2H_(2)Orarr X In the complex "X", oxidation state and coordination number of Be are respectively

Answer»

`+2 and 4`
`+2 and 6`
`+4 and 4`
`+4 and 6`

ANSWER :A
Discussion
43.

Be(OH)_2 is

Answer»

ACIDIC
BASIC
AMPHOTERIC
neutral.

Solution :amphoteric
Discussion
44.

Be(OH)_(2)

Answer»

`Mg(OH)_(2)`
`Mg(OH)_(2)`
`B(OH)_(3)`
`Al(OH)_(3)`

ANSWER :3
Discussion
45.

BeO possesses a........ lattice with coordination number of ……………. .

Answer»

SOLUTION :COVALENT
Discussion
46.

BeO is covalent where as MgO is ionic. Why?

Answer»

SOLUTION :Beryllium OXIDE `(BeO)` is covalent due to that small size of `Be^(2+)` ion, while MAGNESIUM oxide `(MgO)` is ionic due to the bigger size of `Mg^(2+)` ion.
Discussion
47.

BeO + C Cl_(4) overset("Heat")(to)

Answer»

SOLUTION :`2BeO + C CI_(2) OVERSET("Heat")(to) 2BeCI_(2) + CO_(2)`
Discussion
48.

BeO is covalent where as MgO is ionic. Give reason.

Answer»

Solution :BERYLLIUM oxide (BeO) is covalent DUE to the SMALL size of `Be^(2+)` ion, While MAGNESIUM oxide (MgO) is IONIC due to the bigger size of `Mg^(2+)` ion.
Discussion
49.

BeO and Be(OH)_(2) are amphoteric while the oxides and hydroxides of other alkaline earth metals are basic. The solubility of hydroxides increases as we move down the group from Be to Ba but the solubility of sulphates and carbonates decreases in that order the thermal stability of carbonates and sulphates of alkaline earth metals increases from Be to Ba as we move from top to bottom in the group. Which of the following is strongest base ?

Answer»

`AL(OH)_(3)`
`Mg(OH)_(2)`
`Ca(OH)_(2)`
`Ba(OH)_(2)`

Solution :Basic CHARACTER of HYDROXIDES increases down the GROUP as electropositive NATURE of elements increases.
Discussion
50.

BeO and Be(OH)_(2) are amphoteric while the oxides and hydroxides of other alkaline earth metals are basic. The solubility of hydroxides increases as we move down the group from Be to Ba but the solubility of sulphates and carbonates decreases in that order the thermal stability of carbonates and sulphates of alkaline earth metals increases from Be to Ba as we move from top to bottom in the group. The solubility in water of sulphates down the Be group is Be gt Mg gt Ca gt Sr gt Ba this is due to

Answer»

HIGH heat of solution for smaller ions like `3A^(2+)`
INCREASING molecular weight
decreasing LATTICE energy
Increase in melting points

Solution :High heat of solvation for smaller ions like `Be^(2+)`
Discussion