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.

Choose the best answer.

Answer»

`Fe_(2)O_(3)`
`Fe_(2)O_(3).FeO`
`Al_(2)O_(3).H_(2)O`
`Al_(2)O_(3).2H_(2)O`

ANSWER :D
Discussion
2.

Choose the amide which on reduction with LIAlH_(4) yields a secondary amine

Answer»

Ethanamide
N - Methyl ethanamide
N, N - dimethyl ethanamide
Phenyl methanamide.

Solution :`UNDERSET("N-Methylethanamide")(CH_(3)-overset(O)overset(||)C-NH-CH_(3))overset(LiAlH_(4))rarr underset((2^(@) -"amine"))("N - Methylethanamine")(CH_(3)CH_(2)NHCH_(3))`
Discussion
3.

Choose proper option of T (True) or F (False) for the following statement : (1) Graphite is soft and electrical conductor due to its characteristic structure. (2) Carbon of graphite possess sp^2 hybridization. (3) Fourth electron of valence orbital of carbon is responsible for conducting current in graphite (4) Distance between two successive layer in graphite is 141 pm.

Answer»

FFFT 
TTTF 
TTTT 
FTFT 

ANSWER :B
Discussion
4.

what is formula of hydrate form of MgCl_2 :-

Answer»
Discussion
5.

Choose incorrect statement:

Answer»

`BeCO_(3)` is kept in the ATMOSPHERE of `CO_(2)` since, it is least thermally stable
Be dissolves in ALKALI FORMING `[Be(OH)_(4)]^(2-)`
`BeF_(4)` forms complex ion with NaF in which Be goes with cation
`BeF_(4)` forms complex ion with NaF in which Be goes with anion

Answer :C
Discussion
6.

Choose correct statements regarding the following reaction Cr_2O_(7(aq))^(-2)+3SO_(3(aq))^(-2) + 8H^(+) rarr 2Cr_((aq))^(+3) +3SO_(4(aq))^(-2) + 4H_2O

Answer»

`Cr_(2)O_(7)^(-2)` is oxidising agent
`SO_(3)^(-2)` is REDUCING agent
The oxidation number of per S-atom in `3SO_(3)^(-2)` is increased by two
The oxidation number of per Cr-atom is decreased by three

Solution :`Cr_(2)^(+6)O_(7)^(-2) + S^(+4)O_(3)^(-2) RARR Cr^(+3) + S^(+6) O_(4)^(-2)`
Discussion
7.

Choose correct statement(s) regarding the following reaction: Cr_(2)O_(7)^(2-)(aq)+3SO_(3)^(2-)(aq)+8H^(+) to 2Cr^(3+)(aq)+3SO_(4)^(2-)(aq)+4H_(2)O

Answer»

`Cr_(2)O_(7)^(2-)` is oxidising agent
`SO_(3)^(2-)` is reducing agent
The oxidation number of per 'S' ATOM in `2SO_(3)^(2-)`is increaseby two
The oxidation number of per 'CR' atom in `Cr_(2)O_(7)^(2-)`is decreaseby two

ANSWER :A::B::C::D
Discussion
8.

Choose correct statement:

Answer»

`Na_(2)S_(2)O_(3).5H_(2)O` cannot be dehydrated to `Na_(2)S_(2)O_(3)` on heating at `215^(@)` C
HYPO FORMS penta sulphide on heating at or above 500K
The reaction of chlorine with hypo is an oxidation reaction involving CHANGE in oxidation of both sulphur atoms from `+2.5` to `+6`.
A dilute solution of hypo GIVES a white precipitate with both `BaC1_(2)` and `CaC1_(2)`

Answer :B
Discussion
9.

Choose Correct statements about proteins

Answer»

Primary STRUCTURE of PROTEINS refer to amino acid sequence
INTERACTION between THREE polypeptide chains GIVE rise to tertiary structure of proteins
Association between four polypeptide chains give quaternary structure of proteins
Folding of polypeptide chain due to interaction between carbonyl group and `-overset(|)N-H` group of peptide linkage give rise to secondry structure

Answer :A::D
Discussion
10.

Choose CORRECT order of bond length

Answer»

S-S bond LENGTH : `S_(2)O_(4)^(2-) gt S_(2)O_(6)^(2-)`
O-O bond length : `H_(2)O_(2) gt O_(2)F_(2)`
N-N bond length : `N_(2)O_(3) gt N_(2)O_(4)`
All are CORRECT

Answer :A
Discussion
11.

Choose correct option of True (T) or False (F) for the statement given for ionic solid : (1) They possess high melting and boiling points. (2) They are electrolytes (3) They possess directional properties for bonds. (4) They may possess collective type of structure.

Answer»

TTFT 
FTTT 
FTFT 
TFTF 

ANSWER :A
Discussion
12.

Choose correct option for the statements given below (Correct statement- T, incorrect statement- F) (i) Electronic configuration of transition metal ion is suitable for formation of complexes (ii) A chemical bond is formed between non-metal and metal atoms in interstitial compounds (iii) Crystal structures of Cu and Au are different

Answer»

TFF
FTT
TFT
TTF

Answer :D
Discussion
13.

Choose correct option for the given statements : (For correct : T, incorrect : F) (i) Ester is obtained as a by-product during preparation of soap. (ii) Soap converts into fatty acidin acidic medium. (iii) Soap forms foam with hard water.

Answer»

TFF
FTF
FTT
TFT

Answer :B
Discussion
14.

Choose correct option by using T (true) or F (false) : (i) In group-15, stability of +3 oxidation state increases down the group. (ii) In group-15, stability of -3 and +5 oxidation state decreases down the group. (iii) Nitrogen element possess +1 to +7 oxidation state when it react with oxygen elements. (iv) Elements of group-15 possess general oxidation state of -3, +3 and +5.

Answer»

FTTF
TTTT
TTFT
FFFF

Answer :C
Discussion
15.

Choose correct combination for x,y and z

Answer»

(IV)(ii)(P)
(IV)(iv)(R)
(III)(iv)(R)
(III)(iv)(Q)

SOLUTION :
Discussion
16.

Choose correct optio for working given cell : Pt|underset("1 bar")(Cl_(2(g)))||Cl_((c_(2)))^(-)|underset("1 bar")(Cl_(2(g)))|Pt

Answer»

`C_(2) gt C_(1)`
`C_(1) gt C_(2)`
`E_(CELL)^(@)=0`
`DeltaG=-ve`

Solution :`underset(C_(1))(CL^(-)) to underset(C_(2))(Cl^(-))`
`E_(cell)=-0.059log((C_(2))/(C_(1)))=0.059log((C_(1))/(C_(2)))`
So, `C_(1) gt C_(2)`, so for the SPONTANEOUS reaction `C_(2) gt C_(1)` is not proper.
Discussion
17.

Choose correct combination for x,y and z

Answer»

<P>(I)(II)(R)
(I)(ii)(P)
(II)(ii)(Q)
(II)(iv)(R)

SOLUTION :
Discussion
18.

Choose correct combination for x,y and z

Answer»

<P>(II)(i)(Q)
(I)(i)(Q)
(II)(III)(Q)
(II)(ii)(P)

SOLUTION :
Discussion
19.

Choose anINCORRECT statement from the following.

Answer»

In case of PRIMARY, SECONDARY and tertiary amines, the basic STRENGTH depends on the extent of HYDROGEN BONDING in the protonated amines.
The presence of groups like`- OCH_3 "and" -CH_3` increases the basic strength of amines.
The presence of group like`-NO_2, CN` and halogens reduces the baisc strength of amines.
The basic strength of amines depends on their contraction.

Answer :D
Discussion
20.

Choose a FALSE statement about CHCl_(3) from the following.

Answer»

It was used as an ANAESTHETIC in earlier days.
It is used as a solvent.
It is stored in TRANSPARENT bottles.
If INHALED for long TIME, it EFFECTS CNS.

Answer :C
Discussion
21.

Cholor ethane reacts with X to form diethyl ether. What is X ?

Answer»

NAOH
`H_2SO_4`
`C_2H_5ONa`
`Na_2S_2O_3`

SOLUTION :`C_2H_5ONa+C_2H_5-Cloverset("DRY ETHER")rarrC_2H_5-O-C_2H_5+NaCl`
Discussion
22.

Cholesterol, when isolated from natural sources, is obtained as a single enantiomer. The observed rotation alpha of a 0.3 g sample of cholesterol in 5mL of chloroform solution contained in a 10 cm polarimeter tube is -0.78^(@). Calculate the specific rotation of cholesterol. A sample of synthetic cholesterol was prepared consisting entirely of (+)-cholesterol. This synthetic (+)-cholesterol was mixed with some natural (-)-cholesterol. The mixture had a specific rotation [alpha]_(D)^(20) " of " -13^(@). What fraction of the mixture was (+)-cholesterol ?

Answer»

SOLUTION :Specific rotation `=[alpha]_(t)^(lambda) =(theta)/(t xx c) = -(0.78)/(1 xx (0.3)/(15)) - 39^(@)`
Enantiomeric EXCESS `=("observed optical rotation")/("optical rotation of pure enantionmer") xx 100 = (-13)/(-39) xx 100 = 33.3%.`
Therefore (+)-cholesterol is of 33.3% and (-)-cholesterol is of 66.6% in the mixture.
Discussion
23.

Cholesteryl alcohol commonly known as …………………… is an important component in our ……………… .

Answer»

SOLUTION :CHOLESTEROL, CELL MEMBRANE
Discussion
24.

Cholesterol that is present in the blood serum is closely associated with

Answer»

HARDENING of the arteries
overactive kidneys
diabetes
osteoperosis

Answer :A
Discussion
25.

CHO-CHO→overset (OH^-) X the product is:

Answer»

`CH_3OH + CH_3OH`
`CH_2OH-COO^-`
`CH_3OH + HCOOH`
`OOC-COO^-`

ANSWER :B
Discussion
26.

CHO-CHOto overset(OH^-) X the product is:

Answer»

`CH_3OH + CH_3OH`
`CH_2OH-COO^-`
`CH_3OH + HCOOH`
`OOC-COO^-`

ANSWER :B
Discussion
27.

Chlorous acid and its salts (chlorites) are:

Answer»

GOOD OXIDISING agents
Good REDUCING agents
Good BLEACHING agents
Good oxidising and bleaching agents

Answer :D
Discussion
28.

Chlorosulphuric acid is formed when H_SO_4 react with

Answer»

`SOCl_(2)`
`NCl_(3)`
`PCl_(5)`
NaCl

Answer :C
Discussion
29.

Chlorotone used as a drug is prepared by the reaction of acetone with :

Answer»

Chlorin
Ethyl chloride
Chloroform
Ethylene dichloride

Answer :C
Discussion
30.

Chloroprene is used in making

Answer»

SYNTHETIC RUBBER
PLASTIC
Pelrol
All

ANSWER :A
Discussion
31.

Chloroquine is an example of :

Answer»

Antipyretic
Antimalarial
Antibacterial
Antitubercular drug

Answer :B
Discussion
32.

Chloroprene is the repeating unit of :

Answer»

POLYSTYRENE
Neoprene
PVC
Polythene

Answer :B
Discussion
33.

Chloroprene is the repeating unit in :

Answer»

POLYSTYRENE
BUNA -S
Neoprene
Glyptal

Answer :C
Discussion
34.

Chloroplatinic acid is:

Answer»

monobasic
dibasic
tribasic
tetrabasic

Answer :B
Discussion
35.

Chloropicrin……………………is used as an insecticide.

Answer»


ANSWER :`"CC"l_(3)NO_(2)`
Discussion
36.

Chloropicrin is used as an …………………..

Answer»


ANSWER :INSECTICIDE
Discussion
37.

Chloropicrin is used as

Answer»

Solvent
Anaesthetic
Perfume
Tear gas

Answer :D
Discussion
38.

Chloropicrin is obtained by the reaction of

Answer»

steam on carbon tetrachloride
NITRIC ACID on chlorobenzene
chlorine on PICRIC acid.
nitric acid on chloroform

Solution :Chloropicrin is nitrochloroform. It is obtained by the nitration of chloroform with `HNO_3`.
`UNDERSET("Chloroform")(H"CC"l_3)overset((conc.)HNO_3)rarrunderset("Chloropicrin")(O_2N"CC"l_3)`
Discussion
39.

Chloropicrin is obtained by the reaction of :

Answer»

NITRIC ACID on chlorobenzene
chlorine on PICRIC acid
nitric acid on chloroform
steam on CARBON tetrachloride

Answer :C
Discussion
40.

Chloropicrin (C Cl_3NO_2) is used as

Answer»

dyes
pharmaceuticals
explosives
soil STERILIZING agents

Answer :D
Discussion
41.

Chlorophyll, the green colouring matter of plants responsible for photosynthesis, contains 2.68% of magnesium by weight. Calculate the number of magnesium atoms in 2.0 g of chlorophyll.

Answer»


Solution :100 g chlorophyll contains Mg = 2.68 g
`THEREFORE " 2G chlorophyll will CONTAIN Mg"=(2.68)/(100)xx2=0.0536g`
1 mole of Mg = 24 g =`6.022xx10^(23)" ATOMS"`
`therefore""0.0536gMg=(6.022xx10^(23))/(24)xx0.0536"atoms"=1.345xx10^(21)"atoms"`
Discussion
42.

Chlorophyll which is responsible for photosynthesis is a complex compound of

Answer»

Mg
Fe
Ca
Al

Answer :A
Discussion
43.

Chloropicrin(Nitrochloroform) used as an insectiside and a war gasis :

Answer»

`CH_2ClCCl_3`
`C Cl_3NO_2`
`CH_2(OH)CH_2Cl`
`CHI_3`

ANSWER :B
Discussion
44.

Chlorophyll, the green colouring matter of plants, contains 2.68% of magnesium by mass. Calculate the number of magnesium atoms is 3.00g of chlorophyll. [Atomic mass of magnesium=24.3g]

Answer»

Solution :Mass of magnesium in 300g of chlorophyll
`=(2.68xx3)/(100)=0.080g`
24.3g of MG CONTAINS`=6.02xx10^(23)` atoms
0.080g of Mg contains =`(6.02xx10^(23))/(24.3)xx0.080`
`=1.98xx10^(21)` atoms.
Discussion
45.

Chlorophyll is the green colouring matter of plant . It contains the element

Answer»

Sodium
Potassium
Magnesium
Manganese

Answer :C
Discussion
46.

Chlorophyll is a co-ordination compound having central atom of:

Answer»

Ca
Mg
Na
K

Answer :B
Discussion
47.

Chlorophyll is a biomolecule responsible for green colour in the plants. Chlorophyll contains 2.68% of magnesium by mass. Calculate the number of magnesium atoms in 6 g of chlorophyll (Mg = 24)

Answer»

`2.01 xx 10^(21)`
`4.03 xx 10^(21)`
`6.02 xx 10^(23)`
`4.03 xx 10^(23)`

ANSWER :B
Discussion
48.

Chlorophyll contains the metal:

Answer»

AI
Fe
Mg
Ca

Answer :C
Discussion
49.

Chlorophyll contains the metal

Answer»

IRON
Cobalt
Magnesium
Manganese

Answer :C
Discussion
50.

Chloronation of propaneiscarriedoutin thepresenceof sunliht,The %yield major and minoralkyl halides willbe :

Answer»

90%,8%
70%.30%
80%,20%
86%,14%

Solution :
Discussion