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.

Compoundof calcium(X)is thecheapestformofalkali, whichcan bedecomposedto giveback X at veryhightemperature.Xis _______.

Answer»

`CaCO_(3)`
`CAO`
`Ca(OH)_(2)`
`CaSO_(4)`

ANSWER :B
Discussion
2.

Compound of an element A with an alkali metal gave a neutral solution in water. In the periodic table the element A belongs to

Answer»

SECOND GROUP
THIRD group
Fourth group
SEVENTH group 

ANSWER :D
Discussion
3.

Compound obtained by passing CO_(2) through BaO_(2) in water is

Answer»

CO
`BA(OH)_(2)`
`H_(2)O_(2)`
`O_(2)`

Solution :`CO_(2)` MAKES WATER ACIDIC
Discussion
4.

{:("Compound", " Magnetic property") , ("(A) NaCl" , "(p) Ferrimagnetic"),("(B) MnO" , "(q) Paramagnetic"),("(C) CrCl"_(3) , "(r) Ferromagnetic"),("(D) CrO"_(2) , "(s) Diamagnetic"),("(E) MgFe"_(2)O_(4) , "(i) Antiferromagnetic"):}

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A-p,B-r,C-q,D-t,E-s
A-t,B-q,C-r,D-p,E-s
A-r,B-t, C-q,D-p,E-s
A-s,B-t,C-q,D-r,E-p

Solution :NaCl - DIAMAGNETIC,` CrCl_(3)` - Paramagnetic, ` CrO_(2)` - FERROMAGNETIC
MnO - Antiferromagnetic, ` MgFe_(2)O_(4)` - Ferrimagnetic
Discussion
5.

Compound . Find the structure of (X)

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SOLUTION :
Discussion
6.

Compound 'E' is:

Answer»

`AgNO_(3)`
`AGCI`
`Hg_(2)CI_(2)`
`Pb(OH)_(2)`

Answer :B
Discussion
7.

Compound [D] is:

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`(Hg + HGS)`
`Ag_(2)S`
`PBS`
`Pb_(2)S.CI_(2)`

ANSWER :C
Discussion
8.

Compound (D)+I^(-)+H^(+) rarr Gas. Evolved gas is similar to:

Answer»

Gas-B
Gas-G
Gas-H
none of these

Solution :`{:(A rarr Pb(NO_(3))_(2),,B rarrNO_(2)(SP^(2))),(Crarr N_(2)O_(3),,Drarr HNO_(2),),(E rarr[Fe(H_(2)O)_(5)NO]SO_(4)(sp^(3)d^(2)),FrarrPbS,),(G rarr H_(2)O,,H rarr NO,):}`
`I rarr PbCrO_(4) (ACOH` insoluble)
`HNO_(2) +I^(-) +H^(+) rarr NO` (Gas H)
Discussion
9.

Compound containing Xe and F having 63.8%of Xe then calculate oxidation number of Xe.

Answer»

SOLUTION :XE : F
`therefore63.8/133:37.2/19`
`therefore0.48:1.95`
`therefore1:4`
`thereforeXe^(+4)`
Discussion
10.

Compound 'C' is:

Answer»

`BiI_(3)`
`BiOI`
`BI(OH)_(2)I`
`[BiI_(4)]^(-)`

ANSWER :B
Discussion
11.

Compound (C) in above sequence of reaction is:

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SOLUTION :
Discussion
12.

Compound 'C' and 'D' are respectively:

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`CaO +CaSO_(4)`
`CaSO_(4)+SO_(2)`
`CaSO_(4)+SO_(3)`
`CaO+SO_(3)`

Answer :D
Discussion
13.

Compound 'B' is:

Answer»

`PbCI_(2)`
`AGCI`
`Hg_(2)CI_(2)`
`(Hg+HgCI_(2))`

Answer :A
Discussion
14.

Compound (A)C_(7)H_(8)O is insoluble in aqueous NaHCO_(3) and dissolves in aqueous NaOH and gives a characteristic colour with neutral FeCl_(3) . When treated with Br_(2)(A) forms compound (B) C_(7)H_(5)O Br_(3). What could be the structure of compound (A) if neither dissolves in aq. NaHCO_(3) nor gives a characteristic colour with FeCl_(3)?

Answer»




ANSWER :A::B
Discussion
15.

Compound (A)C_(7)H_(8)O is insoluble in aqueous NaHCO_(3) and dissolves in aqueous NaOH and gives a characteristic colour with neutral FeCl_(3) . When treated with Br_(2)(A) forms compound (B) C_(7)H_(5)O Br_(3). The most probable structure of compound A is :

Answer»




ANSWER :B
Discussion
16.

Compound (A)C_(7)H_(8)O is insoluble in aqueous NaHCO_(3) and dissolves in aqueous NaOH and gives a characteristic colour with neutral FeCl_(3) . When treated with Br_(2)(A) forms compound (B) C_(7)H_(5)O Br_(3). The structure of compound (B) would be :

Answer»




ANSWER :B
Discussion
17.

Compound A(C_6H_(12)) does not absorb H_(2) in presence of Ni. It forms two monochloro isomers on photochemical chlorination . Its structure can be

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Solution : have two types of CHEMICALS different hydrogen ATOMS so it forms two monochlorol lisomers on photochemical chlornation.
Discussion
18.

Compound A(C_(3)H_(5)N) gives preripitate with Tollen's reagent and H_(2) gas is also evolvedon addition on Li metal. Compound A can be

Answer»

`CH_(3)-CH_(2)-C-=N`
`H-C-=C-NH-CH_(3)`
`CH_(3)-CH_(2)-NVEC(=)C`
`CH_(2)=C=N-CH_(3)`

ANSWER :B
Discussion
19.

Compound A, which is a degradation product of the antibiotic vermiculine has following structure

Answer»




none of these

Solution :`CH_(3)-OVERSET(O)overset(||)C-CH_(2)-CH_(2)-CH_(2)-CH_(2)-overset(O)overset(||)C-CH_(2)-CH_(2)-overset(O)overset(||)C-O`
It is ALSO obtained by rductive ozonolysis of `C (C_(11)H_(18)O_(2))`.
Discussion
20.

Compound Aon oxidation with OsO_4 // NaIO_4 gives cyclo hexanedial. Structure of compound A will be :

Answer»




SOLUTION :
Discussion
21.

Compound A is produced by absorbing dinitrogen trioxide in NA_(2)CO_(3) solution. Compound A is :

Answer»

`Na_(2)O`
`NaNO_(2)`
`N_(2)O`
`Na_(2)O_(2)`

ANSWER :B
Discussion
22.

Compound 'A' is having water of crystallization by the number of:

Answer»

10
20
24
36

Answer :C
Discussion
23.

Compound 'A' is found to contain 36.5 % Na,25.4 % S and 38.1 % O. Its molecular mass is 126. Calculate the molecular formula of the compound. The compound 'A' is easily oxidised to another compound 'B'. Calculate the percentage composition of 'B'.

Answer»


SOLUTION :STEP I. Empirical formula of the COMPOUND 'A'
`{:("Element","Percentage","Atomic mass","Gram toms (Moles)","Atomic ratio (Molar ratio)","SIMPLEST whole no. ratio"),("Na",36.5,23,(36.5)/(23)=1.59,(1.59)/(0.79)=2,2),("S",25.4,32,(25.4)/(32)=0.79,(0.79)/(0.79)=1,1),("O",38.1,16,(38.1)/(16)=2.38,(2.38)/(0.79)=3,3):}`
Empirical formula of the compound `= Na_(2)SO_(3)`
Step II. Molecular formula of compound 'A'
Empirical formula mass `= 2 xx 23 + 32 + 3 xx 16 = 126 u`
Molecular mass = 126 u
`n=("Molecular mass")/("Empirical formula mass")=(126)/(126)=1`
`:.` Molecular formula of the compound `'A' = n xx` Empirical formula `= 1 xx Na_(2)SO_(3)=Na_(2)SO_(3)`
Step III. Percentage composition of compound 'B'
`underset((A))(Na_(2)SO_(3))overset([O])(rarr)underset((B))(Na_(2)SO_(4))`
Molecular mass of `B = 2 xx 23+32 + 4 xx 16 = 142 u`
Percentage of `Na = (46)/(142) xx 100 = 32.4 %`
Percentage of `S = (32)/(142) xx 100 = 22.54 %`
Percentage of `O = (64)/(142) xx 1000 = 45.07 %`.
Discussion
24.

Compound 'A' is:

Answer»

`HCI`
`H_(3)BO_(3)`
`SO_(2)`
`B_(2)O_(3)`

Answer :B
Discussion
25.

Compound 'A' is:

Answer»

`CaSO_(4).2H_(2)O`
`2CaSO_(4).H_(2)O`
`CaSO_(4).3H_(2)O`
`CaSO_(4).5H_(2)O`

Answer :A
Discussion
26.

Compound (A) is:

Answer»

oxalate SALT
formate salt
acetate salt
carbonate salt

Solution :(A) `RARR HCOONa` (B) `Na_(2)C_(2)O_(4)` (D) `Na_(2)CO_(3)`
(F) `Na_(2)S_(2)O_(3)` (H) `[Bi(S_(2)O_(3))_(3)]^(3-)`
(X) `rarr HCOOH (C) H_(2)` (E) `Na_(2)SO_(3)`
(G) `Bi_(2)(S_(2)O_(3))_(3)` (I) `Ag_(2)S_(2)O_(3)` (J) `Ag_(2)S` (K) `[Ag(S_(2)O_(3))_(2)]^(3-)`
Discussion
27.

Compound 'A' gives red precipitate with Cu_(2)Cl_(2)//NH_(4)OH solution and decolourises bromine water. The compound 'A' can be

Answer»

`CH_(2)=CH-UNDERSET(O)underset(||)(C)-CH_(3)`
`CH_(2)=CH-underset(O)underset(||)(C)-H`
`CH_(3)-C-=CH`
PhCHO

Solution :Terminal alkyne gives `Cu_(2)Cl_(2)//NH_(4)OH` and bromine WATER test.
Discussion
28.

Compound (A) C_(8)H_(9)Br, gives a light yellow precipitate when warmed with alcoholic AgNO_(3) (B) easily form anhydride on heating. Identify the compound (A)

Answer»




Solution :Since COMPOUND (A), `MF C_(8)H_(9)Br` gives a light yellow ppt. when warmed with alcoholic `AgNO_(3), Br` must be PRESENT in the side chain. The option (B) is ruled out because Br is present in the ring. Again oxidation of (A) gives an acid B. `C_(8)H_(6)O_(4)` which readily form an anhydride on heating, hence compound (A) must be `o-`disubstituted out of the remaining three option (A, B, C) only
(A) is di-substituted `:.` option A is true
Discussion
29.

Compound (A) (C_8H_8O) on treatment with NH_2OH.HCI gives (B) and (C) rearrange to give (D) and (E), respectively, on treatment with acid. (B), (C),(D)and (E) are all isomers of molecular formula (C_8H_9NO) . When (D) is boiled with alcoholic KOH, an oil (F) (C_6H_7N) separates out. (F) reacts with CH_3COCI to give back (D). On the other hand. (E) on boiling with alkali followed by acidification gives a white solid (G) (C_7H_6O_2). Identify (A)to (G).

Answer»

SOLUTION :
Discussion
30.

Compound (A), C_(6)H_(3)Br, gives a white precipitate when warmed with alcoholic AgNO_(3). Oxidation of (A) gives an acid (B). C_(6)H_(3)O_(4). (B) easily forms anhydride on on heating. Identify the compound (A).

Answer»




ANSWER :D
Discussion
31.

Compound (A) C_5H_(10) does not dissolve in cold dil. H_2SO_4. What is (A) ?

Answer»




Solution :ALKENES and ETHYNE dissolve in cold & Conc. `H_2SO_4` Option B is CORRECT
Discussion
32.

Components of rectified spirit cannot be separated by distillation because

Answer»

it FORMS an Azeotropic mixture
it has components with same BOILING points
it contains IMMISCIBLE liquids
it has HIGH vapour pressure

ANSWER :A
Discussion
33.

Compolete the following equations : (i) Na_(2)O_92)+ 2H_(2) O to (W) +H_(2)O_(2) (ii) 2KO_(2)+2H_(2)O to (X) +(Y) +O_(2) (iii) Na_(2) O+ CO_(2)to (Z).

Answer»

`{:(W, X , Y , Z) , (4Na, K_(2)O , H_(2)O_(2) , Na_(2)CO_(3)):}`
`{:(W, X , Y , Z) , (4Na, K_(2)O , H_(2)O_(2) , Na_(2)CO_(3)):}`
`{:(W, X , Y , Z) , (4NaOH, 2KOH , H_(2)O , Na_(2)O_(2)):}`
`{:(W, X , Y , Z) , (2NAOH, 2KOH , H_(2)O_(2) , Na_(2)CO_(3)):}`

SOLUTION :`Na_(2)O_(2)+2H_(2)O to underset((W))(2NaOH)+ H_(2)O_(2)`
`2KO_(2)+ 2H_(2)O to underset((X))(2KOH)+ underset((Y))(H_(2)O_(2))+ O_(2)`
`Na_(2) O+CO_(2) to underset((Z))(Na_(2) CO_(3))`
Discussion
34.

Thermodynamically, the most stable allotrope of carbon is……………..

Answer»


ANSWER :GRAPHITE
Discussion
35.

Complete the reactions and identify the products. CH_(3) - underset(underset(OH)(|))(CH) - CH_(3) overset(H^(+)//K_(2)Cr_(2)O_(7))rarr A overset((O))rarr B

Answer»

SOLUTION :
Discussion
36.

Complete the reactions and identify the products.

Answer»

SOLUTION :
Discussion
37.

Complete the reaction: Zn(s)+2H^(+)(aq)to

Answer»


Answer :`Zn_((s))+2H_((AQ))^(+)OVERSET(DELTA)(to)Zn_((aq))^(2+)+H_(2(g))`
Discussion
38.

Complete the reaction: C(s)+H_(2)O(g)overset(Delta)(to)

Answer»


Answer :`C_((s))+H_(2)O_((g))OVERSET(DELTA)(to)CO_((g))+H_(2(g))`
Discussion
39.

Complete the reaction: CO(g)+H_(2)O(g)overset(Delta)(to)

Answer»


ANSWER :`CO_((G))+H_(2)O_((g))OVERSET(Delta)(to)CO_(2(g))+H_(2(g))`
Discussion
40.

Complete the reaction, C CI_(4)

Answer»

SOLUTION :
Discussion
41.

Complete the reaction ,C_2H_5NH_2 overset(C_2H_5Br)underset(-HBr)to ? overset(C_2H_5Br)underset(-HBr)to ? overset(C_2H_5Br)underset(-HBr)to?

Answer»

Solution :`underset(I^(@)-amine)(C_2H_5NH_2)overset(C_2H_5Br)underset(-HBR)to underset(2^(@)-amine)((C_2H_5)NH) overset(C_2H_5Br)underset(-HBr)to underset(3^(@)-amine)((C_2H_5)N)overset(C_2H_5Br)underset(-HBr)tounderset("quarternary AMMONIUM salt")((C_2H_5)_4N^(+)BR)`
Discussion
42.

Complete the reaction as follows. Pyrolysis of kerosene :

Answer»

Solution :`UNDERSET("kerosene")underset("Dodecane")(C_(12)H_(26)) underset("PD, Pt, Ni")overset("Pyrolysis 973K")rarr underset("Alkane")underset("HEPTANE")(C_(7)H_(16))+underset("Alkene")underset("Pentene")(C_(5)H_(10))+"other products"`
Discussion
43.

Complete the reaction as follows. n-Hexane overset("Aromatization")rarr

Answer»

SOLUTION :
Discussion
44.

Complete the reaction as follows. Pyrolysis of hexane :

Answer»

SOLUTION :
Discussion
45.

Complete the reaction as follows. Oxidation 2-methylpropane reaction :

Answer»

Solution :`underset("2-methaylpropane")((CH_(3))_(3)CH) underset(+(O))overset(KMnO_(4))rarr underset("2-methaylpropane-2-ol")((CH_(3))_(3)C-OH)`
Discussion
46.

Complete the reaction as follows. Liberation of dihydrogen gas reaction :

Answer»

Solution :`underset("Methane")(CH_(4(G))) + underset("STEAM")(H_(2)O_((g))) underset(1273K)OVERSET(NI)rarr underset("monoxide")underset("Carbon")(CO_((g))) + underset("DIHYDROGEN")(3H_(2(g)))`
Discussion
47.

Complete the reaction as follows. n-Heptane overset("Aromatization")rarr

Answer»

SOLUTION :
Discussion
48.

Complete the reaction as follows. Incomplete combustion of methane :

Answer»

Solution :`underset("METHANE")(CH_(4(G))) + O_(2(g)) underset("combustion")OVERSET("INCOMPLETE")rarr C_((s)) + underset("Carbon")(2H_(2)O_((l)))`
Discussion
49.

Complete the reaction as follows. Controlled chlorination of ethane :

Answer»

Solution :`underset("Ethane")(CH_(3))-CH_(3)+Cl_(2) overset(HV)RARR underset("Chloroethane")(CH_(3)-CH_(2)Cl)+HCl`
Discussion
50.

Complete the reaction as follows. Complete oxidation of methane :

Answer»

Solution :`underset("Methane")(CH_(4(g))) + 2O_(2(g)) RARR CO_(2(g)) + 2H_(2)O_((l)) Delta_(C)H^(ɵ) = -890kJ mol^(-1)`
Discussion