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.

CaCl_(2) + Na_(2) CO_(3) rarr 2NaCl + CaCO_(3) CaSO_(4) + Na_(2)CO_(3) rarr CaCO_(3) + Na_(2)SO_(4) If hardness is 100 ppm amount of Na_(2)CO_(3) required to soften 10 lt. Of hard water is

Answer»

`2.12` GM
`0.10` gm
`10.6` gm
`1.06` gm

ANSWER :D
Discussion
2.

CaCI_(2).6H_(2)O(s)hArrCaCI_(2)(s)+6H_(2)O(s) K_(p)=6.4xx10^(-17) atm^(6) Excess solid CaCI_(2).6H_(2)O "&" CaCI_(2) "are taken in a container containing some water vapours at a pressure of "1.14 "torr at a particular temp".

Answer»

`CaCI_(2)(s)` acts as DRYING agent under GIVEN condition.
`CaCI_(2)(s)` acts as hydrosceopic SUBSTANCE given condition.
`CaCI_(2)6H_(2)O(s)` acts as effuoroscent substance.
Mass of `CaCI_(2).6H_(2)O(s)` increases dueto some reaction.

Solution :Equilibrium partial PRESSURE of `H_(2)O(g)=(24xx10^(-18))=2xx10^(-3)atm=1.52` torr
Discussion
3.

CaC_2 overset(H_2O)to A underset(Cu" tube") overset("Red hot ")to B. B is

Answer»

TOLUENE
Ethyl-benzene
Benzene
BUTYNE

SOLUTION :
Discussion
4.

CaC_(2) react with H_(2)O to form which gas

Answer»

`CH_(4)`
`C_(2)H_(4)`
`C_(2)H_(3)`
All

Answer :C
Discussion
5.

CaC_2 overset(H_2O)to A underset(Cu" tube") overset(500^(@) C ) to B underset(AlC_3("anhyd")) overset(CH_3Cl)to C , C in the sequence is

Answer»

CHLOROBENZENE
TOLUENE
Acetophenone
hexa chloro cyclohexane

Solution :`CaC_2 + H_2O to C_2H_2 + CA(OH)_2`,
`3C_2H_2 to C_6H_6 UNDERSET(AlCl_3)overset(CH_3Cl)to C_6H_5CH_3`
Discussion
6.

CaC_(2) + 2H_(2)Orarr X CH_3 - CH_(2) Cl overset("alc" KOH) rarr Y, X overset(Z)rarr Y In this reaction the reagent 'Z' is

Answer»

`Ni//H_2`
`LiAIH_4`
`H_(2) - PD +BaSO_(4)`
`(Zn - HG) + conc . HCL`

Answer :C
Discussion
7.

Ca_(3)(PO_(4))_(2) is presents in bones.

Answer»


ANSWER :T
Discussion
8.

Ca_(2)B_(6)O_(11)+Na_(2)CO_(3)overset(Delta)rarr[X]+CaCO_(3)+NaBO_(2) (unbalanced equation) Correct choice (s) for [X] is/are :

Answer»

X with `NaOH(aq)`, GIVES a COMPOUND which on reaction with `H_(2)O_(2)` in alkaline medium yield a compound used as a brightner in soaps.
Structure of anion of crystalline [X] has one boron ATOM `sp^(3)` hybridised and other three boron atoms `sp^(2)` hydridiseed.
Hydrolysis of `[X]` with `HCl` or `H_(2)SO_(4)` yields a compound on reaction with HF gives fluoroboric acid.
[X] on heating with chromium salts in OXIDISING flame GREEN coloured bead.

Answer :A::C::D
Discussion
9.

Ca_(2)B_(6)O_(11) + Na_(2)CO_(3) overset("fusion")rarr A + B + CaCO_(3) A("solution") + CO_(2)rarr B + Na_(2)CO_(3) B + Conc HCl rarr NaCl + C ("acid") The correct statement(s) among the following is/are :

Answer»

Compound A is `NaBO_(2)`
`1` mole of solution of B REQUIRES 2 moles of HCL for its complete reaction
Compound C is `H_(2)B_(4)O_(7)`,
pH of aq solution of B is EQUAL to pKa of acid C when equimolar SOLUTIONS of B and C are considered.

Answer :A::B::C
Discussion
10.

Ca^(2+) ions are important in blood clotting.

Answer»


ANSWER :T
Discussion
11.

Ca is a good reducing agent, because

Answer»

Due to its has SMALL size
It has negative reduction potential
It is the FIRST MEMBER of group 2
It has one electron in OUTERMOST shell

Answer :B
Discussion
12.

C_(8)H_(16)O_(6)(P)overset(O_(3))underset(Zn,H_(2)O)toC_(4)H_(8)O_(4)(Q) overset("Molisch")underset("reagent")toviolet colour ring structure of P cannot be

Answer»

`underset(OH)underset(|)(CH_(2))-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH)-CH=CH-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH_(2))`

`underset(OH)underset(|)(CH_(2))-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH)-CH=CH-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH)-CH=O`
`HO OC-CH_(2)-underset(OH)underset(|)(CH)-CH=CH-underset(OH)underset(|)(CH)-CH_(2)-CO OH`

Solution :carbohydrate (`ALPHA`-HYDROXY carbonyl) GIVES test with molisch reagent.
Discussion
13.

C_(8)H_(10) overset(O_(3), H_(2)O)rarrC_(4)H_(6)O_(2) Acid (B), Identify (A) and (B) in the above reaction

Answer»

SOLUTION :
Discussion
14.

C_(7)H_(7)Cl shows how many benzenoid aromatic isomers ?

Answer»

4
3
5
6

Solution :
Discussion
15.

C_70 fullerene , form which colour in toluene solvent ?

Answer»

VIOLET
ORANGE RED
Red
Yellow

ANSWER :B
Discussion
16.

C_6H_7 + A C_2O overset( AlCl_3) to (x) + CH_3COOH , x will be

Answer»




SOLUTION :
Discussion
17.

C_(6)H_(6)underset(AlCl_(3))overset(CH_(3)COCl)toAunderset(HCl)overset(Zn-Hg)toB. The end product in the above sequence is

Answer»

Toluene
Ethyl benzene
Both and above
none

Solution :Acyltaion FOLLOWED by clemenson REDUCTION.
Discussion
18.

C_(6)H_(6(l)) + 7.5O_(2(g))to 6CO_(2(g)) + 3H_(2) O_((g)) DeltaH= -326.7 kj In this reaction, the standard enthalpy of formation of CO_(2(g)) and H_(2) O_((g)) are -393.5 and -285.85 kilo Joule\mole ""^(-1) respectively calculate the standard heat of formation of benzene.

Answer»

SOLUTION :`49.15` kj/mol
Discussion
19.

C_6H_6 underset(H_2SO_4)overset(HNO_3)(rarr)X underset(FeBr_3)overset(Br_2)rarr Y.The compound Y is

Answer»

o-Bromonitrobenzene 
m-Bromonitrobenzene 
o-Bromobenzenesulphonic ACID 
m-Bromobenzenesulphonic acid

Answer :B
Discussion
20.

C_(6)H_(6) overset(H_(2)SO_(4))rarrA overset("Alkali")rarrB underset("water")overset(Br_(2))rarrC In the above sequence C is

Answer»

o-Bromophenol
p-Bromophenol
2,4,6-Tribromophenol
m-Bromophenol

Solution :
Discussion
21.

C_6H_6 easily shown

Answer»

RING FISSION reaction since it is UNSTABLE
Addition reactions since it is saturated
ELECTROPHILIC substitution reactions due to stable ring
Nuclephilicsubstitution reactions due to stable ring

Answer :C
Discussion
22.

C_(6)H_(6)+CH_(3)Cl underset(AlCl_(3))overset("Anhydrous")rarr C_(6)H_(5)CH_(3)+HCl is an example of

Answer»

Friedel-Craft's reaction
Kolbe's synthesis
WURTZ reaction
GRIGNARD reaction

SOLUTION :`C_(6)H_(6)+CH_(3)Cl underset(AlCl_(3))overset("Anhydrous")rarr C_(6)H_(5)CH_(3)+HCl` it is a Friedel-Craft.s reaction.
Discussion
23.

C_6H_6 +CH_2Cl_2 overset(AlCl_3)to C , excess .

Answer»




SOLUTION :
Discussion
24.

C_6H_6 + C_6H_5Cl overset(AlCl_3)to P , P is

Answer»




No reaction

SOLUTION :This is an example of FRIEDEL - craft reaction , but hear benzenonium ion is UNSTABLE , so it will be FORMED , hence there will be no reaction .
Discussion
25.

C_(6)H_(6)+Aoverset(AlCl_(3))toC_(6)H_(5)CONH_(2). A in the above reaction is

Answer»

`NH_(2)CONH_(2)`
`ClCONH_(2)`
`CH_(3)CONH_(2)`
`CH_(2)(CL)CONH_(2)`

Solution :`ClCONH_(2)+AlCl_(3)to OVERSET(o+)(C)ONH_(2)`.
Discussion
26.

C_6H_6 + 6Cl_2 underset("Dark, Cold")overset("Anhy,"AlCl_3)to A ""C_6H_6 + 3Cl_2 underset(500K) overset(UV)to B. The organic compound (A) and (B) are

Answer»

`C_6Cl_(12), C_6H_6Cl_6`
`C_6H_6Cl_12 , C_6H_6Cl_6`
`C_6H_5 CL , C_6H_6 Cl_6`
`C_6H_5Cl, C_6H_5Cl`

Solution :FIRST RXN is ArES and the second rxn is addition
Discussion
27.

C_(6)H_(5)OH underset(NaOH)overset(C Cl_(4))rarrX underset("Heat")overset("Zndust")rarr Y underset((i) "Sodalime")overset((i) Na)rarrZ In the above sequence Z is

Answer»

Toluene
Cresol
Benzene
Benzol

Solution :
Discussion
28.

C_(6)H_(5)OH underset(H_(2)SO)overset(Conc. HNO_(4))rarr X. The X can be

Answer»

Benzene
Catechol
only p-Nitrophenol
2,4,6-Trinitrophenol

Solution :
Discussion
29.

C_(6)H_(5)OH underset(NaOH(aq.))overset(ClCOCH_(3))rarrC_(6)H_(5)OCOCH_(3) The abovereaction is an example

Answer»

REIMER Teimann reaction
Schotten Baumann Reaction
ACETYLATION
Benzoylation

Solution :Acetylation
Discussion
30.

C_6H_5MgBr reacts with methanol to give _______ and _________

Answer»

<BR>

ANSWER :`C_6H_6, MG(OCH_3)Br`
Discussion
31.

C_(6)H_(5)CO - COC_(6) H_(5) overset(OH^(-))rarr (C_(6)H_(5))_(2) overset(OH)overset(|)(C) - COOH the above reaction is known as

Answer»

Backmann rearrangement
BENZILIC ACID rearrangement
Benzoin condensation
Aldol condensation

Solution :It is an EXAMPLE of Benzilic acid REARRANGEMENTS
Discussion
32.

{:(C_(6)H_(5)-C-H),(""||),("":N-OH):} is

Answer»

E-isomer
Z- isomer
Syn - isomer
Anti - isomer

Solution :
are same SIDE it is a syn-isomer
Discussion
33.

C_(6)H_(15)^(14)COOH on heating with Na_(2)CO_(3) releases

Answer»

`CO_(2)`
`.^(14)CO_(2)`
`CO`
None of these

Solution :`2C_(6) H_(5) OVERSET(14)(C) OOH + Na_(2)CO_(3) rarr 2C_(6)H_(5) overset(14)(C) OO Na + CO_(2) + H_(2)O`
Discussion
34.

C_(6)H_(12)(P) has only two types of alkenes that can be reduced to only one type of alkane C_(6)H_(14)(Q).Q is :

Answer»




SOLUTION :
Discussion
35.

C_(60) an allotrope of carbon contains

Answer»

16 HEXAGONS and 16 pentagons
12 hexagons and 20 pentagons
18 hexagons and 14 pentagons
20 hexagons and 12 pentagons.

Solution : 20 hexagons and 12 pentagons.
Discussion
36.

C_60 , an allotrope of carbon contains :

Answer»

20 hexagons and 12 PENTAGONS.
12 hexagons and 20 pentagons.
18 hexagons and 14 pentagons.
16 hexagons and 16 pentagons.

Solution :In `C_60`MOLECULE there are 20 hexagons and 12 pentagons.
Discussion
37.

C_5H_5Broverset([H])toM. M is

Answer»

Ethane
Ethene
Ethyne
Ethyl hydride

Answer :A
Discussion
38.

C_(5)H_(10)O overset(H_(3)O^(o+))rarrB+C, (B) and (C) both give +ve iodoform test. Compound (A) is :

Answer»

`CH_(3)-CH=CH-O-CH_(2)-CH_(3)`
`CH_(3)-underset(CH_(3))underset(|)OVERSET(H)overset(|)(C)-O-CH=CH_(2)`
`CH_(3)-underset(CH_(2))underset("||")(C)-O-CH_(2)-CH_(3)`
None of these

Answer :B::C
Discussion
39.

C_4H_8 can have a total of __isomers ( include cyclic isomers not geometrical )

Answer»

a. `3`
b. `4`
C. `5`
d. `6`

SOLUTION :
Discussion
40.

Write the structural formulas and IUPAC names for all possible isomers having the number of double or triple bond as indicated: C_(4)H_(8) (one double bond)

Answer»

3
4
5
6

Solution :
Discussion
41.

C_4H_4O_4 can be

Answer»

a. A CYCLIC ester of dibasic ACID
b. A cis-dibasic acid
C. A trans-dibasic acid
d. All true

Solution :
Discussion
42.

C_(4)H_(4)O_(4) can be

Answer»

A CYCLIC ESTER of DIBASIC acid
A cis-dibasic acid
A trans-dibasic acid
All TRUE

SOLUTION :
Discussion
43.

C_(3) AOS is present in :

Answer»




INORGANIC genzene

Solution :N//A
Discussion
44.

C_(2)H_(6)underset("Sunlight")overset("1Mole"Cl_(2))rarrAoverset("Alc.KOH")rarrBunderset(200^(@)C)overset(H_(2)//Ni)rarrC Here, the final product 'C' is

Answer»

`C_(2)H_(6)`
`C_(2)H_(5)Cl` and aq. `KOH//Delta`
`C_(2)H_(4)`
`C_(4)H_(10)`

Answer :A
Discussion
45.

C_(2)H_(6)underset("air")overset(x,Delta)rarr Ethanoicacid, here 'X' is

Answer»

`(CH_(3)COO)_(2)Mg`
acedified `KMnO_(4)`
`(CH_(3)COO)_(2)Mn`
`CH_(3)COONA`

Answer :C
Discussion
46.

C_(2)H_(6)overset(450^(@)C)rarrC_(2)H_(4)+H_(2). Above reaction is called is

Answer»

Combustion
REARRANGEMENT
Pyrolysis
CLEAVAGE

ANSWER :C
Discussion
47.

Consider the following reactions, C_(2) H_(6)(g) + nO_(2) rarr CO_(2) (g) + H_(2) O(l) In this equation, ratio of the coefficient of CO_(2) and H_(2)O is

Answer»

`1:1`
`2:3`
`3:2`
`1:3`

ANSWER :B
Discussion
48.

C_(2)H_(6(g)) + 3.5 O_(2(g)) rarr 2CO_(2(g)) + 3H_(2)O_((g)) Delta S_("vap") (H_(2)O,l) = x_(1) " cal" K^(-1) (boiling point is T_(1)) Delta H_(f) (H_(2)O, l) = x_(2), Delta H_(f) (CO_(2)) = x_(3), Delta H_(f) (C_(2)H_(6)) = x_(4) Hence Delta H for the reaction is

Answer»

`2x_(3) + 3x_(2) - x_(4)`
`2x_(3) + 3x_(2) - x_(4) + 3x_(1) T_(1)`
`2x_(3) + 3x_(2) - x_(4) - 3x_(1) T_(1)`
`x_(1) T_(1) + X_(2) + X_(3) - x_(4)`

Solution :`DELTA H_("vap") (H_(2)O) = Delta S xx T_(BP) = x_(1)T_(1)`
`Delta H = 2DELTA H_(f_(CO_(2)))- Delta H_(f_(C_(2)H_(6)))`
`2x_(3) + 3(x_(2) + x_(1) T_(1)) - x_(4)`
Discussion
49.

C_(2)H_(5)OH(l)+3O_(2)(g)to2CO_(2)(g)+3H_(2)O(g) During an experiment 10.00 g of ethanol is complately burned in air to release CO_(2)(g) andH_(2)O(g) as shown in the equation above .During the combustion ,296.6 Kj of heat energy is released. What Is the molar enthalpy ofcombution ,DeltaH_(comb)^(@)?

Answer»

`-2966KJxxmol^(-1)`
`-1364KJxxmol^(-1)`
`-64.36Kjxxmol^(-1)`
`-29.66KJ MOL^(-1)`

ANSWER :B
Discussion
50.

C_(2)H_(5)ON a is ...........of C_(2)H_(5)OH

Answer»

STRONG ACID
WEAK acid
strong base
weak base

Answer :A::B::C::D
Discussion