Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

22951.

The sulphide ion concentration [S^(2-)] in saturated H_(2)S solution is 1 xx 10^(-22). Which of the following sulphides should be quantitatively precipitated by H_(2)S in the presence of dil. HCl {:("Sulphide",,"Solubility Product"),("(I)",,1.4xx10^(-16)),("(II)",,1.2xx10^(-22)),("(III)",,8.2xx10^(-46)),("(IV)",,5.0xx10^(-34)):}

Answer»

I, II
III, IV
II, III, IV
Only I

Solution :Basic radicals of group II & IV are precipitated by `H_(2)S` in the form of their SULPHIDES. Iind group in acidic medium & IV group in ALKALINE medium. They precipitate when IONIC product increases than solubility product.
Discussion
22952.

Which of the following metals will react directly with nitrogen to form nitride?

Answer»

NA
K
Cs
Li

Answer :D
Discussion
22953.

Which of the following statements is not true?

Answer»

Both physisorption and chemisorption are exothermic
Physisorption takes PLACE with decrease of free energy whereas the chemisorption occurs with increase of free energy
Physisorption requires low activation energy but the chemisorption requires high activation energy
The magnitude of chemisorption INCREASES and that of physisorption decreases with RISE in temperature

Solution :DG for both physisorption and chemisorption is negative.
Discussion
22954.

Which of the following reactions are used for detecting presence of carbonyl group?

Answer»

Reaction with hydroxylamine
Reaction with HYDRAZINE
Reaction with PHENYLHYDRAZINE
Reaction with semicarbazide HYDROCHLORIDE

ANSWER :A::B::C::D
Discussion
22955.

Which of the following methods yield saturated hydrocarbon ?

Answer»

`R-CH=CH_2underset(CH_3COOH)OVERSET(BH_3)to`
`R-CH=CH_2overset(CH_2N_2,DELTA)to`

SOLUTION :
Discussion
22956.

Which of the following has highest coagurating power for As _(2)S_(3) sol ?

Answer»

`SO _(4) ^(2-)`
`AL ^(3+)`
`PO_(4) ^(3-)`
`K^(+).`

Solution :`As _(2) S _(3)`is a NEGATIVELY charged sol so the flocculation of this sol will depend upon the high CHARGE of cations, So, highest coagulating POWER will be of `AL ^(3+)` ions.
Discussion
22957.

Which is a protein:

Answer»

Gelatin
Casein
Plasma protein
All

Answer :A
Discussion
22958.

What type of polymer is high density polythene ?

Answer»

SOLUTION : LINEAR POLYMER
Discussion
22959.

Which of the following alkenes with molecular formula C_(4)H_(8) exhibits geometrical isomerism?

Answer»




ANSWER :A
Discussion
22960.

When acidified solution of potassium dichromate is shaken with aqueous solution of ferrous sulphate then

Answer»

`Cr_(2)O_(7)^(2-)` ion is reduced to `CR^(3+)` ions
`Cr_(2)O_(7)^(2-)` ion is converted to `CrO_(4)^(2-)` ions
`Cr_(2)O_(7)^(2-)` ion is oxidised to Cr
`Cr_(2)O_(7)^(2-)` ion is oxidised to `CrO_(3)`

Answer :A
Discussion
22961.

White phosphorus is:

Answer»

STRONG poison
Mild poison
Non-poisonous
None

Answer :B
Discussion
22962.

The technique used to refining zinc and mercury is ……

Answer»

Liquation
Distillation
Zone refining
Van-Arkel method

Answer :B
Discussion
22963.

Which of the following alcohol will react fast with Lucas reagent :

Answer»

`CH_3CH_2CH_2OH`


`CH_3CH_2OH`

ANSWER :C
Discussion
22964.

What type of stoichiometric defect is shown by the followign solid ?

Answer»

Solution : AgCl to FRENKEL DEFECT, KCL to SCHOTTKY defect.
Discussion
22965.

Write down the IUPAC name of the following complex : [Cr(NH_(3))_(2)(en)]Cl (en = ethylenediamine)

Answer»

SOLUTION :diamminedichlorido (ethane-1, 2-diamine) CHLORIDE
Discussion
22966.

Which of the following point defects are shown by AgBr(s) crystals ? (i) Schottky defect (ii) Frenkel defect (iii) Metal excess defect (iv) Metal deficiency defect

Answer»

(i) and (ii) 
(iii) and (iv) 
(i) and (iii) 
(ii) and (iv) 

Solution :AgBr shows Schottky and FRENKEL DEFECTS. In AgBr, both `Ag^+` and Br are absent from lattice sites. ALSO `Ag^+` ions have tendency to MOVE aside the lattice and trapped in interstitial sites.
Discussion
22967.

Which of the following salts will have maximum cooling effect when 0.5 mole of the salt is dissolved in same amount of water. Integral heat of solution at 298 K is given for each salt ?

Answer»

`KNO_(3) (Delta H = 35.4 KJ mol^(-1))`
`NaCl (Delta H = 5.35 kJ mol^(-1))`
`HBr (Delta H = -83.3 kJ mol^(-1))`
`KOH (Delta H = -55.6 kJ mol^(-1))`

Answer :A
Discussion
22968.

Which is used to reduce the acidity of soil

Answer»

CALCIUM hydroxide
Ammonium sulphate
Ammonium nitrate
Ammonium CHLORIDE

ANSWER :A
Discussion
22969.

Why cannot colloidal sol. Be filtered by ordinary filter paper ?

Answer»

Solution :Colloidal PARTICLES have smaller SIZE than the pores of ordinary filter PAPER.
Discussion
22970.

What are the froth stabilizers in forth floatation process

Answer»

Aniline
Pine oil
Cresol
Xanthate

SOLUTION : In FROTH flotation cresols & aniline are froth STABILIZERS.
Discussion
22971.

The value of Delta_f G^@ for the formation of Cr_2 O_3 is -540 KJ mol^(-1) and that of Al_2 O_3 is -827 KJ mol^(-1). Is reduction of Cr_2 O_3 possible with Al ?

Answer»

Solution :The TWO EQUATIONS are :
`(i) 4/3 Al (s) + O_2 (g) to 2/3 Al_2 O_3 (s)Delta_f G^@ (Al, Al_2 O_3) = -827 KJ mol^(-1)`
(ii) `4/3 Cr (s) + O_2 (g) to 2/3 Cr_2 O_3 (s) ""Delta_f G^@ (Cr, Cr_2 O_3) =-540 KJ mol^(-1)`
SUBTRACTING eqn. (ii) from eqn (i), we get
`4/3 Al (s)+ 2/3 Cr_2 O_3 (s) to 2/3 Al_2 O_3 (s) + 4/3 Cr(s) "" Delta_r G^@ =-287 KJ mol^(-1)`
Since `Delta_r G^@` for the combined REACTION is -ve. therefore , the above reaction, i.e. reduction of `Cr_2 O_3` by Al is POSSIBLE.
Discussion
22972.

Which of the following outer electronic configuration represents Argon?

Answer»

`2s^2 2p^6`
`3s^2 3p^4`
`3s^2 3p^6`
`3s^2 3p^5`

ANSWER :C
Discussion
22973.

Which is expected to be paramagnetic:

Answer»

`Ni(H_2O)_6]^(2+)`
`[Ni(CO_4)]`
`[Zn(NH_3)_4]^(2+)`
`[CO(NH_3)_6]^(3+)`

ANSWER :A
Discussion
22974.

What will be the cmffor the given cell P1|H_(2)(P_(1))H^(+)(aq)||H_(2) (P_(2))P1

Answer»

`(RT)/(F) LOG _(E)""(P_(1))/(P _(2))`
`(RT)/(2F) log _(e)""(P _(1))/(P_(2))`
`(RT)/(F) log _(e)""(P_(2))/(P_(1))`
None of these

SOLUTION :`RHS:2H^(-)2e^(-) hArr H_(2) (P_(2))`
`LHS: H_(2)(P_(1)) hArr 2H^(+)+2e^(-)`
OVERALL REACTION : `H_(2) P_(1) hArr H_(2)(P _(2))`
`E*E* *(RT)/(nF)ln"" (P_(2))/(P_(1))*(RT)/(nF) ln ""(P_(1))/(P_(2))`
Discussion
22975.

Write the chemical equation to show that chlorine gas can be obtained from bleaching powder.

Answer»

SOLUTION :Bleaching powder reacts with dilute acids like `H_(2)SO_(4)`, HCl, etc. to liberate `Cl_(2)` GAS.
`UNDERSET("Bleaching powder")(CaOCl_(2))+H_(2)SO_(4) rarr CaSO_(4) + H_(2)O + Cl_(2)`
Discussion
22976.

Which of the following is NOT a CORRECT order (i) AlCl_(3) > All_(3) > AlBr_(3) (Melting point) (ii) Rb_(2)CO_(3) > K_(2)CO_(3) > Na_(2)CO_(3) (decomposition temperature) (iii) BeC_(2)O_(4) < MgC_(2)O_(4) < CaC_(2)O_(4) (Solubility) (iv) Li_(3)N > Na_(3)N > K_(3)N (Thermal stability)

Answer»

i, III, iv
i, iii
Only iii
iii and iv

Answer :C
Discussion
22977.

What is a complex salt?

Answer»

SOLUTION :A complex salt contains at least one complex ion in which a METAL ion is SURROUNDED by a definite number of LIGANDS.
Discussion
22978.

Which one of the following can possibly be used as analgesicwithout causing addiction and mood modification ?

Answer»

Diazepam
Morphine
N-Acetyl-para-aminophenol
Tetrahydrocannabinol

Solution :We KNOW that N-acetyl-para-aminophenol (or paracetamol) is an antipyretic which can also be USED as an ANALGESIC to relieve pain
Discussion
22979.

What is the number of sigma and pi bonds present in H_(2)SO_(4) molecule ?

Answer»

`6 SIGMA and 2pi`
`6 sigma and 0 pi`
`2 sigma and 4pi`
`2 sigma and 2pi`

ANSWER :A
Discussion
22980.

Which of the following is not a biotechnology product :

Answer»

INTERFERON
HUMAN INSULIN hormone
Vaccines
Cortisone

Answer :D
Discussion
22981.

Transition state is accompanied by the formation of which of the fowllowing species in SN^(1) reaction

Answer»

carbocation
free radicals
carbanion
a dianion

Answer :A
Discussion
22982.

Which one of the following species is most stable

Answer»

`p-O_(2)N-C_(6)H_(4)-overset(+)(C)H_(2)`
`p-CH_(3)O-C_(6)H_(4)-overset(+)(C)H_(2)`
`p-Cl-C_(6)H_(4)-overset(+)(C)H_(2)`
`C_(6)H_(5)-overset(+)(C)H_(2)`

SOLUTION :
Nitro-group is electron withdrawing therefore DECREASES STABILITY.

Methoxy group is electron releasing.
Therefore increases stability by DONATING electron.

Chlorine is also electron withdrawing but its effect is less than `-NO_(2)` group.
HENCE, correct order of stability.
Discussion
22983.

What is an antipyretic ? Give an example.

Answer»

SOLUTION :Chemicals which are used to bring down the BODY temperature during high fever are called antipyretics For example, PARACETAMOL, ASPIRIN, etc.
Discussion
22984.

Which of the following ion of Ianthan ides is / are coloured?

Answer»

`Ce^(+3)`
`Tb^(+3)`
`ER^(+3)`
Both (B) and(C )

ANSWER :D
Discussion
22985.

The vapour density of a volatile chloride of a metal is 59.5 and the equivalent mass of the metal is 24. the atomic mass of the element will be:

Answer»

96
48
24
12

Answer :B
Discussion
22986.

Which of the following compounds will exhibit cis-trans isomerism ?

Answer»

2-butene
2-butyne
2-butanol
Butanal

Answer :A
Discussion
22987.

Which of the following lanthanoids shows +4 oxidation state to acquire noble gas configuration? {Atomic no: La= 57, Ce= 58, Eu = 63 and Yb= 70)

Answer»

Ce
Yb
La
Eu

Answer :A
Discussion
22988.

Write the formula to calculate spin only magnetic moment.

Answer»

SOLUTION :`mu=sqrt(N(n+2))BM`
Discussion
22989.

Which of the reaction are most common in alkyl halides

Answer»

NUCLEOPHILIC substitution
Nucleophilic addition
Electrophilic addition
Electrophilic substitution

Answer :A
Discussion
22990.

What happens when acetone reacts with : NH_2OH

Answer»

SOLUTION :
Discussion
22991.

Which of the following is not a favourable condition for physical adsorption ?

Answer»

high pressure
negative `DELTAH`
higher critical temperature of adsorbate
high temperature

Solution :PHYSICAL adsorption DECREASES with increase of temperature. Hence, (d) is not FAVOURABLE.
Discussion
22992.

Which halide has the largest boiling point

Answer»

HI
HBr
HCl
HF

Answer :D
Discussion
22993.

The variation of "^"_m of acetic acid with concen-tration is correctly represented by

Answer»




SOLUTION :
Discussion
22994.

What is the final product of the reaction ? (CH-)(3) HC = C (CH_(3)) CH_(2)CH_(3)underset((ii)H_(2)O_(2)//bar(O)H)overset((i)BH_(3)//THF) to underset(CH_(2)Cl_(2))overset(P"CC")tounderset((ii)H_(3)O^(+))overset((i)CH_(3)MgBr) to

Answer»

2,3 - DIMETHYL - 3-- PENTANOL
2,4 - dimethyl - 3 - pentanol
2,3 - dimethyl - 2- pentanol
2,2 - dimethyl - 3- pentanol

SOLUTION :
Discussion
22995.

The structure of equanil is :

Answer»




ANSWER :C
Discussion
22996.

Which of the following sppecies is basec and reducing ?

Answer»

`SO _(3) ^(2-)`
`SO _(4) ^(2-)`
`S_(2) O _(4) ^(2-)`
`HSO _(4) ^(-)`

ANSWER :A
Discussion
22997.

Whichof the followingwill undergoesHofman'sreactionto givea 1^(0)amine ?

Answer»




SOLUTION :Amidegives `1^(@)`aminesby Hoffmann'sdegradtionmethod.
Discussion
22998.

The reason for greater range of oxidation states in actinoids is attributed to

Answer»

the radioactive NUMBER of actinoids
actinoid contraction
5f,6d and 7s LEVELS having comparable energies
4f and 5D levels being close in energies

Solution :The greater range of oxidation states shown by actinoids is DUE to 5f,6d and 7s levels having comparable energies and thus all their electrons can take part in BOND formation.
Discussion
22999.

Which of the following is not true about antifertility drugs. ?

Answer»

Birth control pills contain a MIXTURE of syntheticestorgen and progesterone DERIVATIVES.
Both COMPOUNDS i.e., estrogen and progesterone are vitamins .
Progestrone is SUPPOSED to suppress ovulation.
Norethindrone is an example of syntheticprogesterone derivative.

Solution :Estrogen and progesterone are HORMONES .
Discussion
23000.

Which of the following comments are not true for hcp and ccp structures? In both cases-

Answer»

unit cells have the same NUMBER of particles
unit cells have the same packing efficiency
particles have the same COORDINATION number
LAYERS FORMED by particles have the same packing sequence

Answer :A::D
Discussion