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.

Substances used in bringing down the body temperature in high fever are called

Answer»

Antiseptics
Pyretics
Antibiotics
ANTIPYRETICS

Solution :SUBSTANCES USED to bringdown the body TEMPERATURE during high fever are called antipyretics.
Discussion
2.

Substances like gum, starch form lyophilic lyophobic sols.

Answer»

SOLUTION :LYOPHILIC
Discussion
3.

Substances used in bringing down the body temperature in high fevers are called :

Answer»

analgesics
antipyretics
antihistamines
tranquilizers.

SOLUTION :Antipyretics lower the BODY temperaturein fever.
Discussion
4.

Substances in which all the electron spins are paired are ul"termed as paramagnetic."

Answer»

SOLUTION :TERMED as DIAMAGNETIC
Discussion
5.

{:("Substance","Oxidation state of N"),("A) "HNO_(3),"1) "-3","+5),("B) "NH_(4)NO_(3),"2) "-1//3),("C) "N_(3)H,"3) "+5),("D) "H_(3)PO_(3),"d) "+3),(,"5) "+1//3):} The correct match is

Answer»

`{:(A,B,C,D),(3,1,2,4):}`
`{:(A,B,C,D),(5,2,3,4):}`
`{:(A,B,C,D),(1,2,3,4):}`
`{:(A,B,C,D),(4,3,2,5):}`

ANSWER :A
Discussion
6.

Substance which absorbs CO_2and violently reacts with H_2O with sound is:

Answer»

`CaCO_3`
CAO
`H_2SO_4`
ZnO

Answer :B
Discussion
7.

Substance used in paints is

Answer»

TEFLON
dynel
PVC
NOVOLAC

ANSWER :D
Discussion
8.

Which is used to remove N_2 from air:

Answer»

P
Mg
`CaCl_2`
CONC. `H_2SO_4`

ANSWER :B
Discussion
9.

Substance used in Home's signal is :

Answer»

`NH_(3) & C_2H_(2)`
`PH_(3) & C_(2) H_2`
`PH_3 & NH_3`
all

Solution :Holme.s Signal : MIXTURE used to produce smoke screens.
`Ca_(3) P_2 +6H_(2)O rarr 3Ca(OH)_2+2PH_3`
`CaC_2+H_2O rarr CAO +C_(2)H_2`.
`PH_(3)+C_(2)H_2` - are used in Holme.s signal.
Discussion
10.

Substance used in Holme's signal is:

Answer»

`NH_3`
`PH_3`
`PH_5`
`P_2O_5`

ANSWER :D
Discussion
11.

Substance used in glazing pottery is:

Answer»

`ZNO`
`ZnCl_2`
Alum
Calomel

Answer :A
Discussion
12.

Substance used for the preservation of coloured fruit juices is

Answer»

benzene
BENZOIC acid
phenol
sodium META bisulphite

Solution :Benzoic ACIDS is USED as PRESERVATIVE as sodiumbenzoate .
Discussion
13.

Substance used for bringing down temperature in high fever are called

Answer»

Antibiotics
Antipyretics
Pyretics
Antiseptics

Solution :It is antipyretic i.e., a DRUG which is responsible for LOWERING the temperature of feverish organism to normal.
Discussion
14.

Substance A_(2)B(g) can undergoes decomposition to form two set of products : If the molar ratio of A_(2)(g) to A(g) is 5 : 3 in a set of product gases, then the energy involved in the decomposition of 1 mole of A_(2)B(g) is :

Answer»

`48.75kJ//mol`
`43.75kJ//mol`
`46.25kJ//mol`
`64.2 kJ//mol`

ANSWER :B
Discussion
15.

Substance containing an asymmetric carbon atom is:

Answer»

`CH_3CH_2OH`
`CFBrCl_2`
`C(OH)HBr_2`
CHClBrF

Answer :D
Discussion
16.

Sublimation method can be used for the purification of :

Answer»

Naphthalene
Benzoic acid
Camphor
All of these

Answer :D
Discussion
17.

Substance containing an asymmetric carbon atom

Answer»

`CFBrCl_(2)`
`CH_(3)CH_(2)OH`
`C(OH)HBr_(2)`
CHClBrF

Answer :D
Discussion
18.

Substance (A) is a colourless pungent smelling gas of vapour density 8.5. It turned Nessler's reagent brown. (A) on oxidation at high temperature with platinum catalyst gave a colourless gas (B), which readily turned brown in air, forming a gas (C). (B) and (C) were condensed together to give substance (D), which reacted with water to form an acid (E). When (E) was heated with a solution of NH_(4)Cl, a stable gas (F) was evolved. (F) did not support combustion, but magnesium continued to burn in it. Itentify substances (A) to (F) and explain all the reactions involved.

Answer»

Solution :(i) `underset(("A"))underset("Ammonia")(NH_(3)) + underset("Nessler's reagent")(2K_(2)Hgl_(4)) + 3 KOH rarr underset(("Brown ppt."))underset("Iodide of Million's base")(H_(2)N.Hg.O.HGL) + 7 KI + 2 H_(2)O`
(ii) `underset("Ammonia (A)")(4 NH_(3)) + 5 O_(2) overset("Pt. Heat")rarr underset("Nitric OXIDE (B)")(4 NO) + 6 H_(2)O`
(iii) `2 NO + O_(2) rarr underset(("Brown"))underset("Nitrogen dioxide (C)")(2 NO_(2))`
(iv) `NO + NO_(2) overset("Condensed")rarr underset("Dinitrogen trioxide (D)")(N_(2)O_(3))`
(v) `N_(2)O_(3) + H_(2) O rarr underset("Nitrous acid (E)")(2 HNO_(2))`
(VI) `HNO_(2) + NH_(4)Cl rarr underset("Nitrogen (F)")(N_(2)) + 2 H_(2)O + HCl`
(vii) `underset("Magnesium")(Mg) + N_(2) overset("Heat")rarr underset("Magnesium nitride")(Mg_(3)N_(2))`
Discussion
19.

SubstanceA overset(Cu//573K)to isobutlyene, which is structural formula of substance A in this reaction ?

Answer»

`CH_(3)CH_(2)CH_(2)CH_(2)-OH`
`CH_(3)CH(CH_(3))CH_(2)OH`
`CH_(3)CH(OH)CH_(2))CH_(3)`
`(CH_(3))_(3)C-OH`

SOLUTION :`(CH_(3))_(3)C-OH`
Discussion
20.

Subance used in hyper acidity are known as

Answer»

Antixidant
antacids
Antibiotics
Antifertility

ANSWER :D
Discussion
21.

Styrene polymerises to polystyrene when heated in the presence of peroxide initiator. What is the mechanism involved?

Answer»

SOLUTION :FREE RADICAL POLYMERISATION.
Discussion
22.

Styrene to benzoic acid

Answer»

SOLUTION :
Discussion
23.

Styrene polymerises to polystyrene when heated in the presence of peroxide initiator. How does the chain propogate in the above mechanism?

Answer»

SOLUTION : Propagation step

The stabilized radical attacks another monomer molecule to GIVE an ELONGATED radical.

CHAIN growth will CONTINUE with the successive addition of several thousands of monomer units.
Discussion
24.

Styrene polymerises to polystyrene when heated in the presence of peroxide initiator. How is the above chain reaction terminated?

Answer»

Solution :The above CHAIN reaction can be stopped by STOPPING the SUPPLY of monomer or by coupling of two chains or reaction with an impurity such as OXYGEN.
Discussion
25.

Styrene polymerises to polystyrene when heated in the presence of peroxide initiator. Give the initiation step for the above process.

Answer»

Solution :styrenepolymerises to polystyrene when it is heated to ionic with a peroxide initiator. The MECHANISM INVOLVES the FOLLOWING STEPS.
Discussion
26.

Styrene to 2-phenylbromoethane

Answer»

SOLUTION :STYRENE to 2-phenylbromoethane :
Discussion
27.

Styrene on hydroboration oxidation gives

Answer»

2-phenyl ethan-1-ol
1-phenyl ethan-1-ol
BENZOIC ACID
benzaldehyde

Answer :A
Discussion
28.

Styrene can be purified by:

Answer»

SIMPLE DISTILLATION
Fractional distillation
Steam distillation
VACUUM distillation

Solution :STYRENE can be PURIFIED by vacuum distillation.
Discussion
29.

Study the two photochemical reactions and answer the questions given below: For the overall reaction between A and B to yield C and D two mechanisms are proposed: (I) A+B rarr AB* rarr C+D,k_(1)=1xx10^(-5)M^(-1)s^(-1) (II) A rarr A* rarr E,k_(1)=1xx10^(-4)M^(-1)s^(-1) E+Brarr C+D,k_(2)=1xx10^(10)M^(-1) s^(-1) (species with * are short-lived) Rate according to mechanism II when concentration of each reactant is 1 M will be:

Answer»

`1xx10^(-4) M s^(-1)`
`1xx10^(10)M s^(-1)`
`1xx10^(-6)M s^(-1)`
`1xx10^(-10) M s^(-1)`

ANSWER :A
Discussion
30.

Study the two photochemical reactions and answer the questions given below: For the overall reaction between A and B to yield C and D two mechanisms are proposed: (I) A+B rarr AB* rarr C+D,k_(1)=1xx10^(-5)M^(-1)s^(-1) (II) A rarr A* rarr E,k_(1)=1xx10^(-4)M^(-1)s^(-1) E+Brarr C+D,k_(2)=1xx10^(10)M^(-1) s^(-1) (species with * are short-lived) At what concentration of B, rates of two mechanism are equal?

Answer»

1 M
5 M
7 M
10 M

Answer :D
Discussion
31.

Study the two photochemical reactions and answer the questions given below: For the overall reaction between A and B to yield C and D two mechanisms are proposed: (I) A+B rarr AB* rarr C+D,k_(1)=1xx10^(-5)M^(-1)s^(-1) (II) A rarr A* rarr E,k_(1)=1xx10^(-4)M^(-1)s^(-1) E+Brarr C+D,k_(2)=1xx10^(10)M^(-1) s^(-1) (species with * are short-lived) Rate according to mechanism I when concentration of each reactant is 0.1 M will be:

Answer»

`1XX10^(-7)M s^(-1)`
`1xx10^(-6) M s^(-1)`
`1xx10^(-5) M s^(-1)`
`1xx10^(-4)M s^(-1)`

Answer :A
Discussion
32.

Study the reactionscarefully. (i) HOCl +H_(2)O_(2) to H_(3)O^(+) +Cl^(-)+O^(2) (ii) PbS +4H_(2)O_(2) to PbSO_(4) + 4H_(2)O Mark the correct option.

Answer»

In (i), HOCL is REDUCED and in (II) PBS is oxidised.
In (i), HOC1 is oxidised and in (ii) PbS is reduced.
In both (i) and (ii), HOCl and PbS are reduced.
In both (i) and (ii), HOCl and PbS are oxidised.

Solution :
Discussion
33.

Study the parallel first order reaction: Aoverset(k_(1))to2B 2Aoverset(k_(2))to3C At any time (tne0) the products contain 40% B and 60% C, by moles .If the overall rate constant for the reaction of A is 0.09min^(-1) ,then value of K_(1) is :

Answer»

`0.036 MIN^(-1)`
`0.03 min^(-1)`
`0.054 min^(-1)`
`0.06 min^(-1)`

ANSWER :B
Discussion
34.

Study the given graphs and select the correct statement regarding them.

Answer»

GRAPH (A) represents physisorption isobar.
Graph (B) represents chemisorption isobar.
Graph (C) represents an adsorption isostere.
All of these

Answer :D
Discussion
35.

Study the following table: {:("Compound","Mass of the compound"),(CO_(2)(44),4.4),(NO_(2)(46),2.3),(H_(2)O_(2)(34),6.8),(SO_(2)(64),1.6):} Which two compounds have least mass of oxygen? (Molercular masses of compounds are given in brackets.

Answer»

II nd II
I and III
I and II
III and IV

Solution :I. Mass of oxygenpresent`=(4.4)/(44)xx32=3.2g`
II. Mass of oxygen PRESENT `=(2.3)/(46)xx32=1.6g`
III. Mass of oxygen present`=(6.8)/(34)xx32=6.4g`
IV. Mass of oxygen present `=(1.6)/(64)xx32=0.8g`
`therefore` II and IV have least mass of oxygen.
Discussion
36.

Study the following sequence of reaction and identify the product (Y). CH_(3)CHO +HCHO overset("dil."NaOH)underset("heat") to X overset(HCN) underset(H_(3)O^(+)) to Y

Answer»

`CH_(2)=CH-underset(OH)underset(|)(CH)-COOH`
`CH_(3)-OVERSET(CN)overset(|)underset(OH)underset(|)C-COOH`
`CH_(3)CH_(2)-underset(OH) underset(|)CH-COOH`
`CH_(2)=CH-underset(CN)underset(|)(CH)-COOH`

Solution :`{:(H-overset(O)overset("||")C-H+HCH_(2)-CHOoverset("dil. " NaOH)underset("HEAT")to underset(OH)underset(|)("CH"_(2))-overset(H)overset(|)CH-CHO),("" darr overset(" ")underset(" ")-H_(2)O),(underset((Y))(CH_(2)=CH-underset(OH)underset(|)CH-COOH)overset("HCN")underset(H_(3)O)larrunderset((X))(CH_(2)=CH-CHO)):}`
Discussion
37.

Study the following reactions and mark the appropriate choice. (A) + C_(2)H_(5)OH to (B)+(C ) (C ) +HOH overset(H^(+)) to (B)+(D) (D) overset([O]) to (B) (B) +Ca(OH)_(2) to "Calcium salt"+H_(2)O overset("dry distillation")to underset(("Acetone"))(CH_(3)COCH_(3))

Answer»

`{:("(A)","(B)","(C)","(D)"),((CH_(3)CO)_(2)O,CH_(3)COOH,CH_(3)COOC_(2)H_(5),C_(2)H_(5)OH):}`
`{:("(A)","(B)","(C)","(D)"),(CH_(3)COCl,HCOOH,CH_(3)COOCH_(3),CH_(3)OH):}`
`{:("(A)","(B)","(C)","(D)"),(CH_(3)COOH,CH_(3)OH,CH_(3)COOCH_(3),CH_(3)OH):}`
`{:("(A)","(B)","(C)","(D)"),(CH_(3)NH_(2),CH_(3)COOH,CH_(3)COOCH_(3),C_(2)H_(5)OH):}`

Solution :`underset((A))((CH_(3)CO)_(2)O)+C_(2)H_(5)OH to underset((B))(CH_(3)COOH)+underset((C))(CH_(3)COOC_(2)H_(5))`
`underset((C))(CH_(3)COOC_(2)H_(5))+HOH overset(H^(+))to underset((B))(CH_(3)COOH)+underset((C))(C_(2)H_(5)OH)`
`underset((D))(C_(2)H_(5)OH)overset([O])to underset((B))(CH_(3)COOH)`
`underset((B))(2CH_(3)COOH)+Ca(OH)_(2) to underset(underset(("ACETONE"))underset(CH_(3)COCH_(3))(""darr overset(" ")underset(" ")"dry distillation"))((CH_(3)COO)_(2))Ca+H_(2)O`
Discussion
38.

The major product of the following reaction is: CH_(3)-underset(H)underset(|)overset(CH_(3))overset(|)C-underset(Br)underset(|)(CHCH_(3)) overset(CH_(3)OH) to

Answer»

1. `{:("(A)","(B)","(C)","(D)"),((CH_(3)CO)_(2)O,CH_(3)COOH,CH_(3)COOC_(2)H_(5),C_(2)H_(5)OH):}`
2. `{:("(A)","(B)","(C)","(D)"),(CH_(3)COCL,HCOOH,CH_(3)COOCH_(3),CH_(3)OH):}`
3. `{:("(A)","(B)","(C)","(D)"),(CH_(3)COOH,CH_(3)OH,CH_(3)COOCH_(3),CH_(3)OH):}`
4. `{:("(A)","(B)","(C)","(D)"),(CH_(3)NH_(2),CH_(3)COOH,CH_(3)COOCH_(3),C_(2)H_(5)OH):}`

Solution :`underset((A))((CH_(3)CO)_(2)O)+C_(2)H_(5)OH to underset((B))(CH_(3)COOH)+underset((C))(CH_(3)COOC_(2)H_(5))`
`underset((C))(CH_(3)COOC_(2)H_(5))+HOH overset(H^(+))to underset((B))(CH_(3)COOH)+underset((C))(C_(2)H_(5)OH)`
`underset((D))(C_(2)H_(5)OH)overset([O])to underset((B))(CH_(3)COOH)`
`underset((B))(2CH_(3)COOH)+CA(OH)_(2) to underset(underset(("Acetone"))underset(CH_(3)COCH_(3))(""darr overset(" ")underset(" ")"dry distillation"))((CH_(3)COO)_(2))Ca+H_(2)O`
Discussion
39.

Study the following reactions and identify the reactant 'R'. It can be

Answer»




SOLUTION :
Discussion
40.

Study the following experiment and answer the question at the end of it The following reactions were studied at 25^(@) C in benzene solution containing 0.10 M pyridine CH_(3)OH+(C_(6)H_(5))_(3)"CCl" rarr (C_(6)H_(5))_(3)C.OCH_(3)+HCI ABC The following sets of data were observed: {:("Set","Initial concentration",,"Time different",,"Final concentration[C]"),(,[A],[B]_(0),,,),("I",0.10M,0.05M,25 min,,0.0033 M),("II",0.10M,0.10 M,15 min,,0.0039 M),("III",0.20M,0.10M,7.5 min,,0.0077M):} Rate constant of the above experiment is:

Answer»

`1.3xx10^(-1)`
`2.6xx10^(-2)`
`2.6xx10^(-1)`
`1.3xx10^(-2)`

ANSWER :C
Discussion
41.

Study the following figure and choose the correct options from the given below (assuming both dissociate completely).

Answer»

There will be no movement from any solution across the membrane
Osmotic pressure of 0.1 M `Ba_3 (PO_4 )_2` will be higher than 0.1 M `MgSO_4` solution
There will be flow from right SIDE of S.P.M. to that of left
White PRECIPITATE `(BaSO_4 )` will not be formed in right side of the S.P.M.

Answer :B::C::D
Discussion
42.

Study the following experiment and answer the question at the end of it The following reactions were studied at 25^(@) C in benzene solution containing 0.10 M pyridine CH_(3)OH+(C_(6)H_(5))_(3)"CCl" rarr (C_(6)H_(5))_(3)C.OCH_(3)+HCI ABC The following sets of data were observed: {:("Set","Initial concentration",,"Time different",,"Final concentration[C]"),(,[A],[B]_(0),,,),("I",0.10M,0.05M,25 min,,0.0033 M),("II",0.10M,0.10 M,15 min,,0.0039 M),("III",0.20M,0.10M,7.5 min,,0.0077M):} Rate law of the above experiment is:

Answer»

`r=k[A][B]`
`r=k[A]^(2)[B]`
`r=k[A][B]^(2)`
`r=k[A]^(2)[B]^(0)`

ANSWER :B
Discussion
43.

Study the following experiment and answer the question at the end of it The following reactions were studied at 25^(@) C in benzene solution containing 0.10 M pyridine CH_(3)OH+(C_(6)H_(5))_(3)"CCl" rarr (C_(6)H_(5))_(3)C.OCH_(3)+HCI ABC The following sets of data were observed: {:("Set","Initial concentration",,"Time different",,"Final concentration[C]"),(,[A],[B]_(0),,,),("I",0.10M,0.05M,25 min,,0.0033 M),("II",0.10M,0.10 M,15 min,,0.0039 M),("III",0.20M,0.10M,7.5 min,,0.0077M):} Rates (d[C])/(dt) in sets I, II and III are respectively (in M min^(-1))

Answer»

`{:("I",,"II",,"III"),(1.30xx10^(-4),,2.6xx10^(-4),,1.02xx10^(-3)):}`
`{:("I",,"II",,""III),(0.033,,0.0039,,0.0077):}`
`{:("I",,"II",,"III"),(0.02xx10^(-4),,0.04xx10^(-4),,0.017):}`
`{:("I",,"II",,"III"),("NONE of these",,,,):}`

ANSWER :A
Discussion
44.

Study sequence of thereactions above and answer the following questions . The reagent 'A' is

Answer»

PCC
`CrO_2 Cl_2`
`H_2 CrO_4`
`PDC`

SOLUTION :`B: H_2 CR O_4`
Discussion
45.

Study of actinide elements is difficult. Give two reasons.

Answer»

SOLUTION :1. They are RADIOACTIVE elements.
2. They have LONG half - life.
Discussion
46.

Study sequence of thereactions above and answer the following questions . The function group present in the product 'X' is

Answer»

ANHYDRIDE
Amide
Ketone
Imide

Solution :
Discussion
47.

Study following mecahnism of haloform reaction Which step is RDS

Answer»

a
b
c
F

ANSWER :A
Discussion
48.

Study of solar spectrum revealed the presence of

Answer»

`H_2` and He
`H_2` and AR
`H_2` and Ne
Ar and Ne

Solution :`H_2` and He are PRESENT on SUN's ATMOSPHERE
Discussion
49.

Study following mecahnism of haloform reaction Which step products most acidic compound

Answer»

a
c
d
B

Answer :B
Discussion
50.

Strutures of products , Starting materials or reagents

Answer»

SOLUTION :
Discussion