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.

Complete the chemical reaction. 2CuSO_4 + 4kI →

Answer»

SOLUTION :(a)`2CuSO_4 + 4KI RARR 2K_2SO_4 + Cu_2I_2 + I_2`
(B) `Cu_2S + 2Cu_2Orarr 6Cu + SO_2`
Discussion
2.

Complete the chemical equation : Ca_(3) (PO_(4))_(2) + SiO_(2) + C overset("Heat")rarr

Answer»

<P>

Solution :`2 Ca_(3)(PO_(4))_(2) + 6 SiO_(2) + 10C overset(1773 K)rarr 6 CaSiO_(3) + P_(4) + 10 CO`
Discussion
3.

Complete manure is that which supplies

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<P>`S, K` and `N`
`N, K` and `P`
`S` and `N`
`S, N` and `P`

ANSWER :B
Discussion
4.

Complete reduction of benzene-diazonium chloride with Zn/HCl gives :

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Aniline
Phenylhydrazine
Azobenzene
Hydrazobenzene

Solution :
Discussion
5.

Complete hydrolysis product of 1 mole each of following will need how many total number of moles of NaOH for complete neutralisation? SOCl_(2), SO_(2)Cl_(2), PCl_(3), PCl_(5), NCl_(3)

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ANSWER :24
Discussion
6.

Complete hydrolysis of DNAyields a pentosesugar, phosphoricacid and nitrogen containing heterocyclic compouds.

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ANSWER :1
Discussion
7.

Complete hydrolysis of cellulose gives……………………..

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L-Glucose
D-Fructose
D-Ribose
D-Glucose

SOLUTION :D-Glucose
Discussion
8.

Complete hydrolysis of starch gives :

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only GLUCOSE
only SUCROSE
glucose and FRUCTOSE
glucose and sucrose.

Answer :A
Discussion
9.

Complete hydrolysis of cellulosegives ………. .

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L - GLUCOSE
D - FRUCTOSE
D- RIBOSE
D- Glucose

ANSWER :D
Discussion
10.

Complete hydrolysis of cellulose gives :

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L-glucose
D-fructose
D-ribose
D-glucose

Answer :D
Discussion
11.

Complete hydrolysis of cellulose gives

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L - GLUCOSE
D - Fructose
D - Ribose
D - Glucose

Solution :D - Glucose
Discussion
12.

Complete following reaction equation: (i) C_(6)H_(5)N_(2)Cl+KIrarr........

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SOLUTION :(i) `{:(C_(6)H_(5)N_(2)Cl+Kl,to,C_(6)H_(5)I+KClN_(2)),("Benzen",,"Benzene"),("diazonium chloride",,"Iodid"):}`
Discussion
13.

Complete each synthesis by giving the missing starting material, reagent, or products. i. ii. iii. C_(6)H_(5)CHO overset(H_(2)NCONHNH_(2))rarr iv. v. vi. vii. C_(6)H_(5)CHO+CH_(3)CH_(2)CHO overset(Dil.NaOH)rarr viii. CH_(3)COCH_(2)COOC_(2)H_(5)overset((i)NaBH_(4))underset((ii)H^(+))rarr ix. x. xi.

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SOLUTION :i.
ii.
III. `C_(6)H_(5)CH==N NHCONH_(2)` (Benzaldehyde semicarbazone). More nucleophilic centre

iv.
v. Aldehyde is oxidised to `(COO^(Θ))` bt Tollens REAGENT.

vi.
vii. It is an example of Claisen-Schmidt reaction.
Discussion
14.

Complete dissociation of ZnCl_2 gives:

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3 ions
5 ions
4 ions
2 ions

Answer :A
Discussion
15.

Complete combustion of ether gives :

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`C_2H_5OH`
`CO_2 and H_2O`
`C_2H_4`
`C_2H_2`

ANSWER :C
Discussion
16.

Completeand rewrite the balanced chemical equation for the following reactions : (a) 1-chloro-2, 4-dinitro benzene underset((368K,H^(+)))overset("aq.alkali")rarr ? (b) Benzaldehydeoverset("50% KOH")rarr ? Acetone + phenylhydrazine overset(H^(+))rarr?

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SOLUTION :
Discussion
17.

Complete and name the following reactions : (a) RNH_(2)+CHCl_(3)+3KOH rarr (b) RCONH_(2)+Br_(2)+4NaOH rarr

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SOLUTION :(a) `RNH_(2)+CHCl_(3)+3KOH rarr RNC+3KCl+3H_(2)O` <BR>This is KNOWN as carbylamine reaction.
(b) `RCONH_(2)+Br_(2)+4NaOH rarr RNH_(2)+2NaBr+Na_(2)CO_(3)+2H_(2)O`
This reaction is known as Hoffmann bromamide reaction.
Discussion
18.

Complete and balance the following reactions: (a) FeSO_(4)+H_(2)O+O_(2) to , (b) FeCl_(3).6H_(2)O+CH_(3)-underset(OCH_(3))underset(|)overset(OCH_(3))overset(|)C-CH_(3) to (C ) CU(OH)_(2)+(NH_(4))_(2)SO_(4)to,(d)CuCl_(2).2H_(2)Ounderset(Strong)undersettoDelta (e ) AgNO_(3)(excess)+I_(2)+H_(2)O to, (f) KMnO_(4)+Na_(2)S_(2)O+H_(2)O to (g) K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+SO_(2)+H_(2)O undersetto("Temptlt70^(@)C)

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SOLUTION :N//A
Discussion
19.

Complete and name the following reaction.

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Solution :The carbonyl group of ALDEHYDES and ketones is reduced to `CH_(2)` group on treatment with zinc - amalgam and concentrated hydro CHLORIC acid is known as CLEMMENSEN REDUCTION.
Discussion
20.

Complete and balance the following reactions. (i) ""_(92)Th^(234) rarr........ + 7" "_(2)He^(4)+6 " "_(-1)beta^(0) (ii) ""_(92)U^(235)+ " "_(0)n^(1) rarr........ + " "_(52)Te^(137)+6 " "_(40)Zr^(92) (iii) ""_(34)Se^(86) rarr2 " "_(-1)e^(0)+........ +

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ANSWER :A::B::C::D
Discussion
21.

Complete and balance the following equations: CH_3 NH_2+HNO_2to

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SOLUTION :`CH_3 NH_2+HNO_2 toCH_3 OH +N_2+H_2 O`
Discussion
22.

Complete and balance the following equations: C_2 H_5 NH_2 +CH_3 COCl to "…. +…….."

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SOLUTION :`C_2 H_5NH_2+CH_3 COClto C_2 H_5 UNDERSET(H) underset(|)(N) -COCH_3 +HCL`
Discussion
23.

Complete and balance the following equations : (b) KMnO_(4)overset(heat ) (to)

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SOLUTION :`( b )2KMnO_(4)OVERSET( heat) (to)K_(2) MnO_(4)+ MnO_(2) + O_(2)`
Discussion
24.

Complete and balance the following equations : (a) Zn + Fe_(2)(SO_(4))_(3) rarr ? + ? (b) CuSO_(4) overset("heat")rarr ? + ? (c) AI + conc. H_(2)SO_(4) rarr ? + ? + ? (d) AI_(2)O_(3) + C + N_(2) overset("heat")rarr ? + ? (e) Pb + O_(2) + H_(2)O rarr ?

Answer»

Solution :(a) `ZN + Fe_(2)(SO_(4))_(3) RARR ZnSO_(4) + 2FeSO_(4)`
(B) `CuSO_(4)overset(Delta)rarr CUO + SO_(3)`
(c) `2AI + conc. 6H_(2)SO_(4) rarr AI_(2)(SO_(4))_(3) + 3SO_(2) + 6H_(2)O`
(d) `AI_(2)O_(3) + 3C + N_(2) overset(Delta)rarr 2AIN + 3CO`
(e) `2Pb + O_(2) + 2H_(2)O rarr 2Pb (OH)_(2)`
Discussion
25.

Complete and balance the following equations: (a) Mg(HCO_(3))_(2) + Ca (OH)_(2) rarr MgCO_(3) + …..+ H_(2)O (b) MgO + CaC_(2) rarr Mg + ….......+ 2C (C)Be(OH)_(2) + NaOH rarr …........ + CO_(2) (e ) BeCl_(2) + LiAlH_(4) rarr …....... + LiCl + .......... (f) CaO + C rarr ................ + CO rarr ......... + ..........

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Solution :(a) `Mg(HCO_(3))_(2) + Ca (OH)_(2) rarr MgCO_(3) + CaCO_(3) + H_(2)O`
(b) `MgO + CaC_(2) rarr Mg + CaO + 2C `
(C)Be(OH)_(2) + NAOH rarr Na_(2)BeO_(2) + CO_(2)
(E ) `BeCl_(2) + LiAlH_(4) rarr 8BeH_(2) + LICL + AlCl_(3) `
(f) `CaO + C rarr CaC_(2) + CO + N_(2)rarr CaCN_(2) + C `
Discussion
26.

Complete and balance the following equations : (a) MnO_(4)^(2-) + H^(+) to

Answer»

Solution :`(a ) 3MnO_(4)^(2-)4H^(+) to 2MnO_(4)^(-)+ MnO_(2)+ 2H_(2)O`
Discussion
27.

Complete and balance the following equation: (i). K_2Cr_2O_7+…+4H_2SO_4toK_2SO_4+Cr_2(SO_4)_3+7H_2O+3I_2 (ii). KK_2Cr_2O_7underset(400^@C)overset(triangle)to (c). KMnO_4underset(200^@C)overset(triangle)to (iv). MnO_4^(ɵ)+AsO_3^(ɵ)+H^(o+)to (v). K_(2)Cr_(2)O_(7)+overset(NH_(4)Cl)to

Answer»

SOLUTION :(i). `Cr_2O_7^(2-)+6Ii^(ɵ)+14H^(o+)to2Cr^(3+)+7H_2O+3I_2`
(ii). `K_2Cr_2O_7overset(Delta)toK_2CrO_4+Cr_2O_3+O_2`
(iii). `KMnO_4overset(Delta)toK_2MnO_4+MnO_2+O_2` (DISPROPORTIONATION)
(iv). `2MnO_4^(ɵ)+5AsO_3^(ɵ)+6H^(o+)to2Mn^(2+)+3H_2O+5AsO_4^(3-)`
(V). `K_2Cr_2O_7+2NH_4C"l" to(NH_4)_2Cr_2O_7+2KCl`
Discussion
28.

Complete and balance the following chemtcel MnO_(4)^(-)+H_(2)+I^(-)to

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SOLUTION :`2MnO4^–+ H2O + I_– to 2 MnO_2 + 2OH_–^ + IO3_–`
Discussion
29.

Complete and balance the following chemtcel Fe^(2+) +MnO_(4) ^(-) +H^(+) to

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Solution :`5Fe^(2+) + MNO^(– 4) + 8H^+ toMn^(2+) + 4H_2O + 5Fe^(3+)`
Discussion
30.

Complete and balance the following chemical equations : MnO_(4)^(-)+H_(2)O+I^(-)to

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SOLUTION :`2MnO_(4)+H_(2)O+Ito2MnO_(2)+2OH+IO_(3)`
Discussion
31.

Complete and balance the following chemical equations : MnO_(4)^(-)+H^(+)+I^(-)to

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SOLUTION :`2MnO_(4)^(-)+16H^(+)+10I^(-)to2Mn^(2+)+8H_(2)O+5I_(2)`
Discussion
32.

Complete and balance the following chemical equations : (i) underset("(cold + dil.)")(NaOH+)Cl_(2)to (ii) I^(-)(aq)+H_(2)O(l)+O_(3)(g)to

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SOLUTION :(i) `2NaOH+Cl_(2)OVERSET("cold+Dilute")(to)NaCl+NaClO+H_(2)O`
(ii) `I^(-)(aq)+H_(2)O(l)+O_(3)(g)to2OH^(-)(aq)+I_(2)(s)+O_(2)(g)`
Discussion
33.

Complete and balance the following chemical equations : (a) Fe^(2+)+MnO_(4)^(-)+H^(+)to (b) MnO_(4)^(-)+H_(2)O+I^(-)to

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Solution :(a) `5Fe^(2+)+MnO_(4)^(-)+8H^(+)toMn^(2+)+4H_(2)O+5Fe^(3+)`
(B) `2MnO_(4)^(-)+H_(2)O+I^(-)to2MnO_(2)+2OH^(-)+IO_(3)^(-)`
Discussion
34.

Complete and balance the equation: very dilute HNO_3 + Fe rarr

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SOLUTION :`10HNO_3 + 4Fe RARR 4Fe(NO_3)_2 + NH_4NO_3 + 3H_2O`
Discussion
35.

Complete and balancethe following equations: CuSO_4 + PH_3 rarr _____+ 3H_2SO_4

Answer»

SOLUTION :`3CuSO_4 + 2PH_3 RARR Cu_3P_2 + 3H_2SO_4`
Discussion
36.

Complete and balance the equation: P_4 + H_2O + NaOH rarr______+______

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SOLUTION :`P_4 + 3H_2O + 3NaOH RARR 3NaH_2PO_2 + PH_3 UARR`
Discussion
37.

Complete and balance the equation: Very dilute HNO_3+ Cu rarr

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SOLUTION :`8HNO_3+3Curarr 3Cu(NO_3)_2 + 2NO + 2H_2O`
Discussion
38.

Complete and balance the chemical equation : BrO_3^(-) + F_2 + OH^(-) to

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SOLUTION :`BrO_3^(-) + F_2 + 2OH^(-) to BrO_4^(-) + 2F^(-) + H_2O `
Discussion
39.

Complete and balance the chemical equation: BrO_(3)^(-)+ F_2 + OH^(-) rarr

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SOLUTION :`BrO_(3)^(-)+ F_2 + 2OH^(-) RARR BrO_(4)^(-) + 2F^(-) + H_2O`
Discussion
40.

Compete the following reactions: a. b. c. d. e.

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SOLUTION :a.
b.LDA (a bulky strong base) ABSTRACTS less hindered `alpha`-H atom to FORM lithium enolate which adds to C of `(CH=O)` group, to form `BETA`-hydrogen ketone, limiting to only one crossed aldol product. On the other hand, with a weak base (NaOH), two crosed products are formed.

c.
d.
e.
Discussion
41.

Complementary colour of green light of wavelength 5000 A^(@) is

Answer»

PURPLE
BLUE
red
grey

Solution :purple
Discussion
42.

Complete and balance C_(2)H_(5)OH overset(250^(@)C)underset(Al_(2)O_(3))rarr ?

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Solution :`underset("Ethanol") (2C_(2)H_(5)OH) overset(250^(@)C)underset(Al_(2)O_(3)) to C_(2)H_(5)- O - underset("ETHOXY ETHANE")(C_(2)H_(5)) + H_(2)O`
Discussion
43.

Compete the following reaction. CH_(3) underset(Z)underset(underset(HBr)(CH))=CH_(2) underset("Perioxide")overset(HBr)to X underset("Acetone")overset(NaI)to Y

Answer»

Solution :`CH_(3)UNDERSET(Z)underset(|)(underset(HBR)(CH)=CH_(2) underset("PEROXIDE")OVERSET(HBr)to underset(("Bromopropane"))(CH_(3)-CH_(2)-CH_(2)Br) (X)underset("Acetone")overset(NaI)to underset("IODOPROPANE") (CH_(3)CH_(2)CH_(2)-I) (Y)`
`underset("2- Bromopropane")(CH_(3)-underset(Br(Z))underset(|)(CH)-CH_(3)`
Discussion
44.

Comparing Al, B, Ga and Tl, which one exhibits +1 oxidation state?

Answer»

`AL`
B
Ga
TL

Solution :Tl
Discussion
45.

Comparing La(OH)_(3) and Lu(OH)_(3), which is more basic and explain why?

Answer»

Solution :(i) Due tolanthanidecontrationthe size of`La^(3+)` ionsdecreasesregularlywithincreasesin atomicnumber .
(ii)According toFajan'sruledecrease insizeof `Ln^(3+)` ionsincreasethe covalentcharacterand decreasesthe basiccharacterbetween`Ln^(3+)` & `OH^(-)` ion in`Ln (OH)_(3)`.
(iii)Sincethe ORDEROF size`Ln^(3+)` ionsare `La^(3+) gt CE^(3+) ...... gtLu^(3+)`
(iv) Hence `La(OH)_(3)` is the strongestgase while`Lu(OH)_(3)` is theweakest base.
Discussion
46.

Compelte the following reactions by identifying B and C: (ii) CH_(3)-overset(CH_3)overset(|)underset(CH_3)underset(|)C-underset(O)underset(||)C-CH_(3)+NaOH to B+C.

Answer»

Solution :B' is `CH_(4)` and 'C' is `CH_(3)-OVERSET(CH_3)overset(|)UNDERSET(CH_3)underset(|)C-underset ( O) underset(||)C-O N a`.
Discussion
47.

Compared with alkaline earth metals, the alkali metals exhibit.

Answer»

SMALLER IONIC radii
Higher BOILING points
Greater hardness
Lower IONISATION energies

Answer :D
Discussion
48.

Compared with alkaline earth metal the alkali metals exhibit

Answer»

SMALLER IONIC radii
greater hardness
high boiling POINTS
LOWER IONISATION energy

Answer :D
Discussion
49.

Compared to the osmotic pressure of 0.1 M urea, the osmotic pressure of 0.01 M KCl will be ( assume 100 % dissociation)

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<P>APPROXIMATELY 1/5
Approximately 1/10
Approximately half
Approximately double

Solution :`(C_(1))/(C_(2))=(pi_(1))/(pi_(2))` or `(0.1)/(0.01xx2)=(PI)/(pi_(3))`
or `p_(2)=(0.01xx2)/(0.1) pi = pi//5`
Discussion
50.

Comparedto saturated alcohols , phenolshave __________.

Answer»

low B.P. and low solubility in water
HIGH B.P. and low solubility in water
high B.P. and high solubility in water
none of these

ANSWER :B
Discussion