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.

4401.

The reagent used to convert alkyl halide to nitroalkane are1.AgNO_(2) 2. KMnO_(4) in dimethylsulphoxide 3. acidic KMnO_(4)4. HNO_(3)

Answer»

1,4
2,3
1,3
1

Answer :D
Discussion
4402.

Which of the following statements is not correct for a noble gas

Answer»

Ar is used in electric bulbs
Kr is OBTAINED during radioactive disintegration
Half life of RN is only 3.8 days
He is used producing very low temperature

ANSWER :B
Discussion
4403.

Which process of purification is represented by the following scheme? underset(("Impure"))(Ti) + 2I_2 overset(250^@C)(rarr) Ti_(4) overset(1400^@C)(rarr) underset(("Pure"))(Ti) + 2I_2

Answer»

CUPELLATION 
Zone REFINING 
ELECTROLYTIC refining 
Van Arkel process 

ANSWER :D
Discussion
4404.

You are supplied with a gas containing 0.32 g of oxygen. Calculate the number of moles and number of molecules present in it.

Answer»

SOLUTION :0.01 MOLE, `6.022xx10^(21)` MOLECULES
Discussion
4405.

What is the emulsifier in milk ?

Answer»

ALBUMIN
soap
gelatin
caesin

Answer :D
Discussion
4406.

Which element of the following possesses [Xe] 4f^(7) 5d^(1) 6s^(2) electronic structure?

Answer»

LUTETIUM
Terbium
Ytterbium
Gadolinium

Answer :D
Discussion
4407.

Write the monomers which are used for the synthesis of following polymer : Polythene Indicate the type of polymerisation for each which forms polymer.

Answer»

Solution :`{:("MONOMERS","Type of POLYMERISATION"),("Ethene ","ADDITION"):}`
Discussion
4408.

What is the number of oxygen atoms which are shared between tetrahedrons is Si_(3)O_(9)^(-6)

Answer»


ANSWER :C
Discussion
4409.

Which can act as buffer?

Answer»

`NH_4Cl + NH_4OH`
`CH_3COOH + CH_3COONa`
40 ML of 0.1 M NACN + 20 ml of 0.1 M HCl
All of these

Answer :D
Discussion
4410.

Which acts both an oxidizing as well as reducing agent?

Answer»

`HNO_3`
`HNO_2`
`H_2SO_4`
none of these

Solution :`HNO_2`undergoes DISPROPORTIONATION REACTION i.e. both oxidation and REDUCTION SIMULTANEOUSLY.
Discussion
4411.

What is Royal water?

Answer»

Solution :When THREE parts of concentratedhydrochloric acid and one part of concentrated nitric acid nd mixed, aquaregia is obtained. This is ALSO known as Royal water. This is used for dissolving gold, platinum ETC.
`Au+4H^(+)+NO_(3)^(-)+4Cl^(-)rarr AuCl_(3)^(-)rarr AuCl_(4)^(-)+NO+2H_(2)O`
`3Pt+16H^(+)+4NO_(3)^(-)+18Cl^(-)rarr 3PtCl_(3)^(2-)+NO+8H_(2)O`
Discussion
4412.

Tough competition and desire to excel made Manu's life full of tensions and anxiety. This made his nights sleepless. To overcome this, he started taking sleeping pills. But he continued to be feeling awesome. He then consulted a doctor who advised him not to take sleeping pills but prescribed him some mild tranquilliser and asked him to change his lifestyle by doing yoga, meditation and some physical exercise. After a few days, he started feeling better. After reading the above passage, answer the followingquestions : (i) What values are expressed by the doctor? (ii)What is the main ingredient of sleeping pills and how does it work? (iii) Name mild tranquilliser.

Answer»

Solution :(i)The doctor expressed concern about the healthcare and apprised Manu about the moments of sleeping pills, overdose of which act as poison and MAY even cause death
(II) The main ingredient of most of the sleeping pills is barbiturates. These chemicals make you to BREATHE slowly and less DEEPLY. That can be dangerous for people who have asthma or some other heart PROBLEMS.
(iii) Chlordiazepoxide and meprobamate are mild tranquillizers.
Discussion
4413.

What is the co-ordination number of cations in antifluorite structure ?

Answer»

4 
6 
8 
12 

ANSWER :A
Discussion
4414.

Which named reaction is used to reduce CH_3COCl to CH_3CHO?

Answer»


ANSWER :ROSENMUND's REACTION
Discussion
4415.

Which are the affecting factors on the vapour pressure ?

Answer»

The NATURE of liquid
TEMPERATURE
(A) and (B) both
NONE of these

Answer :C
Discussion
4416.

The structure of the compound that gives a tribromo derivative on treatment with bromine-water is

Answer»




Solution :
m-Cresol has TWO ortho- and ONE para- POSITION FREE w.R.t. OH group and hence gives tribromo- derivative, `C_(7)H_(5)OB r_(3)`.
Discussion
4417.

Whichone of thefollowing is disaccharide : (a) Strach , Malotse, Fructose , Glucose .(b) Writethe nameof vitamin whose deficiencycausebonedeformitiesinchildren .

Answer»

SOLUTION :(a) MALTOSE
(B) VITAMIN D
Discussion
4418.

Which of the following is crossedlinked thermosetting polymer

Answer»

NEOPRENE
BAKELITE
ORLON
Polyethene

Answer :B
Discussion
4419.

Which one of the following process is non-spontaneous

Answer»

Dissolution of `CuSO_(4)` in water
Reaction between `H_(2)` and `O_(2)` to form water
Water flowing down hill
Flow of electric current from LOW potential to high potential

Answer :B
Discussion
4420.

Using IUPAC norms write the formulae for the following : Potassium tetracyanidonickelate (II)

Answer»

SOLUTION :`K_(2)[NI(CN)_(4)]`
Discussion
4421.

Which one of the following is a lyophilic colloid ?

Answer»

MILK
Gum
FOG
BLOOD

ANSWER :B
Discussion
4422.

The Van't Hoff factor for 0.1 M Ba(NO_3)_2 solution is 2.74. The degree of dissociation is

Answer»

`91.3%`
`87%`
`100%`
`74%`

ANSWER :B
Discussion
4423.

Which bond is more polar?

Answer»

Cl-Cl
N-F
C-F
O-F

Answer :C
Discussion
4424.

Write the formula of the compound Potassium pentacyanonitrosyl ferrate (III).

Answer»

SOLUTION :The formula of the compound potassium pentacyanonitrosyl ferrate (III) is `K_2[Fe(CN)_5NO]`.
Discussion
4425.

Total number of lone pair of electrons in XeOF_4 IS:

Answer»

0
1
2
3

Answer :B
Discussion
4426.

Write tests of distinguish between : (iii) Pentanal and Pentan-2-one

Answer»

SOLUTION :Pentanal FORMS SILVER MIRROR but pentan-2-one does not.
Discussion
4427.

When 0.1 mol CoCl_(3)(NH_(3))_(5) is treated with excess of AgNO_(3), 0.2 mole of AgCl are obtained. The conductivity of solution will correspond to

Answer»

1:3 electrolyte
1:2 electrolyte
1:1 electrolyte
3:1 electrolyte

Answer :B
Discussion
4428.

Which of the following elemnetns belongs to 4n - series?

Answer»

PB - 207
Bi - 209
Pb - 208
Pb - 206

SOLUTION :4n SERIES elements have mass numbers DIVISIBLE by 4.
Discussion
4429.

Two isomeric alcohols A' and 'B' having composition, C = 60%, H = 13.3%, O = 26.7% possess the vapour density 30. When the vapours are passed separately over heated alumina results in the same product "C", which decolourises the reddish brown colour of bromine solution in CCl_(4). Identify C.

Answer»

`CH_(3)-CH=CH_(2)`
`CH_(3)-overset(CH_(3))overset(|)C=CH_(3)`
`CH_(3)-underset(CH)underset(|)CH=CH_(2)`
`CH_(2)=CH_(2)`

Solution :Relative number of atoms of
`C = (60)/(12)= 5, H= (13.3)/(1.008)= 13.2, O= (26.7)/(16)= 1.67`
Atoms ratio is `C: H: O= (5)/(1.67): (13.2)/(1.67): (1.67)/(1.67)= 3:8:1`
Hence empirical formula is `C_(3)H_(8)O`.
`implies` Empirical formula mass = 60
As molecular mass `2 xx 30 = 60`
So the molecular formula is also `C_(3)H_(8)O`. Hence the two alcohols .A. and .B. are
`underset("(Propan-1-ol)")(CH_(3)-CH_(2)-CH_(2)-OH)` and `underset("(Propan-2-ol)")(CH_(3)-underset(OH)underset(|)CH-CH_(3))`
They are DEHYDRATED to propene, when passed over heated alumina. Propene decolourises the reddish BROWN colour of bromine solution.

`underset("Propene")(CH_(3)- CH= CH_(2)+ Br_(2)) to CH_(3)- underset(br) underset(|)CH-underset(br) underset(|)CH_(2)`
Discussion
4430.

Which statement (s) is (are) incorrect:

Answer»

`Fe(CO)_5` REACTS with `Br_(2)Cl_(4)`
Carbonyl complexes are usually formed with transition metals
All transition metals fonn mono-metallic carbonyls
The decomposition of `Ni(CO)_4` to give Ni is used in the extraction of Ni by Mond's PROCESS

Solution :Transition metals can FORM MELTS metallic corbonyls also
Discussion
4431.

Write following conversions: (i) nitrobenzenetoacetanilide (ii) acetnilidetop-nitroaniline.

Answer»

SOLUTION :
Discussion
4432.

Which of the following is wrong :

Answer»

PMMA is CALLED Plexiglas
PTFE is called Teflon
SBR is called NATURAL rubber
LDPE is called LOW density polyethylene

Answer :C
Discussion
4433.

Which of the following statement is incorrect regarding positive deviation from ideal behaviour

Answer»

Force of interaction decreases
Volume INCREASES
Observed vapour PRESSURE is more than EXPECTED vapour pressure
GIBBS energy change `(DeltaG)` is positive

Answer :D
Discussion
4434.

Which of the following diagram / statement is correct for the hybrid orbitals.

Answer»

`s + p_(y) rarr Z'`
`s + p_(y) + p_(z) rarrsp^(2)` orbitals lie in the xy PLANE
`NS + np^(3) + nd^(2) rarr` results octahedral geometry of `sp^(3)d^(2)` hybrid orbitals.
None of these

Answer :D
Discussion
4435.

Which metal is present in brass, bronze and German silver

Answer»

Zn
Mg
Cu
Al

Answer :C
Discussion
4436.

Which one of the following does not undergo halo form reaction?

Answer»

`CH_3 - undersetoverset(||)(O)(C ) - CH_3`
`CH_3-CH_2 OH`
`CH_3 - CH_2 - undersetoverset(||)(O)(C ) -CH_3`
`CH_3 - CH_2 - undersetoverset(||)(O)(C ) - CH_2 - CH_3`

SOLUTION :`CH_3 - CH_2 - undersetoverset(||)(O)(C ) - CH_2 - CH_3`
Discussion
4437.

What happens when (i) Concentrated H_2SO_(4)is added to calcium fluoride (ii) SO_(3)is passed through water ?

Answer»

SOLUTION :(i) It forms HYDROGEN fluoride
`CaF_(2) + H_(2)SO_(4) to CaSO_(4) + 2HF`
(ii) It dissolves `SO_(3)` to GIVE `H_(2)SO_(4)`
`SO_(3) + H_(2)O to H_(2)SO_(4)`
Discussion
4438.

Which of the following statements for order of reaction is not correct ?

Answer»

ORDER can be determined experimentally
Order of a REACTION is equal to the sum of the powers of concentration terms in differential rate LAW
It is not effected with the STOICHIOMETRIC coefficient of the reactants
Order cannot be fractional .

Solution :(D) Order of a reaction can be fractional .
Discussion
4439.

What is Williamson.s synthesis? What type of compounds are prepared by this reaction ? Give an example.

Answer»

SOLUTION :SODIUM salt of alcohol reacts with alkyl HALIDE to give ether. It is called Williamson.s synthesis. It is used to prepare symmetrical and unsymmetrical ethers
`C_(2)H_(5)Ona +CH_(3)I rarr UNDERSET("Methoxyethane")(C_(2)H_(5)OCH_(3))+NaI`
Discussion
4440.

When acetic acid and K_(4)Fe(CN)_(6) is added to a copper salt, a chocolate precipitate is obtained of the compound

Answer»

Copper cyanide
Copper ferrocyanide
Basic copper sulphate
Basic copper cyanide

Solution :`Cu(NH_(3))_(4)(NO_(3))_(2)+4CH_(3)COOHtoCu(NO_(3))_(2)+4CH_(3)COONH_(4)`
`2CU(NO_(3))_(2)+K_(4)[FE(CN)_(6)]to underset("CHOCOLATE ppt")(Cu_(2)Fe(CN)_(6))+4KNO_(3)`
Discussion
4441.

Which of the following used in Holme's signals?

Answer»

`NH_3`
`O_(2)`
`N_2`
`PH_(3)`

ANSWER :D
Discussion
4442.

What is the best reagent to convert nitrile to primary amine ?

Answer»


Answer :`Na//C_(2)H_(5)OH" or "LiAlH_(4)` CONVERTS nitrile to primary amine.
Discussion
4443.

The two strands in DNA are not identical but arecomplementary.

Answer»

Solution :The two strands in DNA molecule are HELD together by HYDROGEN BONDS between purine base of one strand and pyrimidine base of the other and vice versa. Because of different sizes and geometries of the bases, the only POSSIBLE pairing in DNA are G (guanine) and C (cytosine) through three H-bonds, i.e., (C = G) and between A (adenine) and T (thymine) through two H-bonds (ie., A = T) as shown in figure below. Due to this base-pairing principle, the sequence of bases in one strand automatically fixes the sequence of bases in the other strand. Thus, the two strands are complimentary and not identical. Showing two strands of DNA.
Discussion
4444.

The vapour pressure of pure watr at 30^(@)C is 31.80 mm of Hg. How many grams of urea (molecular mass=60) should be dissolved in 1000 g of water to lower the vapour pressure by 0.25 mm of Hg?

Answer»

<P>

SOLUTION :`P_(A)^(@)=31.80 mm , P_(A)^(@)-P_(S)=31.80-0.25=31.55mm`
`W_(A)=1000g, M_(B)=60" g mol"^(-1), M_(A)=18" g mol"^(-1)`
According to RAOULT's Law,
`(P_(A)^(@)-P_(S))/(P_(S))=x_(B)=(W_(B)xx(18" g mol"^(-1)))/((60" g moll"^(-1))xx(1000g))`
`W_(B)=(0.25)/(31.80)xx((60" g mol"^(-1))xx(1000g))/((18" g mol"^(-1)))=26.2g`
Discussion
4445.

Which of the following is an intensive property?

Answer»

Viscosity
SURFACE tension
Temperature
All of these

Solution :Intensive PROPERTY : Property which does not depend UPON the quantity of matter present in the system or size of the system e.g. Temperature, surface tension, viscosity, ETC.
Discussion
4446.

Whichof the following statement is/are correct withreference to the ferrous andferric ions?

Answer»

`Fe^(3+)` gives browncolour with potassium FERRICYANIDE
`Fe^(2+)` gives blue precipitate with potassium ferricyanide
`Fe^(3+)` gives RED colour with potassium thlocyanate
`Fe^(2+)` gives browncolour with AMMONIUM thiocyatute

Solution :`Fe^(2+) +K_(3)[Fe(CN)_(6)] rarr KFe^(II)[Fe^(III)(CN)_(6)] + 2K^(oplus)` Tumbull's blue is formed
`Fe^(3+) + 3KCNS rarr [Fe(CNS)_(3)] + 3K^(oplus)`
Blood -redcolour is formed
Discussion
4447.

What are emulsions? Give an example of oil disperesed in water (o/w) type emulsion.

Answer»

SOLUTION :Both disphersed PHASE and DISPERSION MEDIUM is liqluid. Ex : Milk.
Discussion
4448.

Why are Ni^(2+) compounds thermodynamically more stable than Pt^(2+) compounds while Pt^(4+) compounds are relatively more stable than Ni^(4+) compounds ?

Answer»

Solution :The thermodynamic stability of transition metal compounds can be easily predicted from the VALUES of ionisation energies. The first four ionisation energy values of nickel and platinum are given below:
`{:((E_(1)+E_(2)),E_(3)+E_(4)to,TOTAL (E_(1)+E_(2)+E_(3)+E_(4))),(Ni 2.49MJmol^(-1), 8.80 MJmol^(-1), 11.29 MJmol^(-1)),(Pt 2.66 MJmol^(-1),6.70 MJmol^(-1),9.36 MJmol^(-1)):}`
From these values, it is clear that `Ni^(2+)` compounds will be thermodynamically more stable than `Pt^(2+)` compounds WHEREAS `Ni^(4+)` compounds are relatively less stable than `Pt^(4+)` compounds.
Discussion
4449.

Which of the following are less acidic than phenol

Answer»

`CH_(3)OH`


`H_(2)O`

Answer :A::B::D
Discussion
4450.

(x) Regions in which metals are found in earth is called

Answer»

Atomophil
Lithrphil
Calcophil
Silderophil

Solution :
Discussion