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.

1951.

Which of the following is the correct order of ionisation potential?

Answer»

`NltO`
`He^(+)gtHe`
`Na^(+)ltNa`
`NgtNe`

Solution :Successive IP's are ALWAYS in increasing ORDER.
Discussion
1952.

Which of the following options is CORRECT For Carbon ?

Answer»

`(I) (III) (S)`
`(I) (IV) (S)`
`(I) (iv) (Q)`
`(I) (II) (Q)`

ANSWER :A
Discussion
1953.

Which amino acid contains sulphur ?

Answer»

METHIONINE and CYSTEINE
ASPARAGINE and Isoleucine
Tryptophan and Methionine
Cysteine and Asparagine

SOLUTION :Methionine and Cysteine
Discussion
1954.

The statements which are the about stoichiometric defects

Answer»

the DENSITY may be less than pure CRYSTAL
the density must be less than pure crystal
the electrical and THERMAL CONDUCTIVITY may be more than pure crystal
the electrical and thermal conductivity must be more than pure crystal

ANSWER :A::D
Discussion
1955.

Write down the main types of polymerizations.

Answer»

Solution :There are TWO broad types of POLYMERIZATION reactions :
(a) The addition or chain growth polymerization
(a) CONDENSATION or STEP growth polymerization.
Discussion
1956.

Which ofthe following drugs is tranquilizer and sedative ?

Answer»

SULPHADIAZINE
Papaverine
Equanil
MESCALINE

Answer :C
Discussion
1957.

Whatisdenaturation ofproteins ?

Answer»

SOLUTION :Whenproteinissubjectedto CHANGEIN temperatureandchangein PH, itlosesitsbiologicalactivity. This iscalleddenaturation ofproteins. Duringdenaturationprimarystructure will not beaffected.
Example :(1) Coagulationof eggwhite
(2) Curdlingofmilk
Discussion
1958.

Which one of thefollowingis storedin the bodyas glycogenand in plant asstarch ?

Answer»

PROTEIN
VITAMIN
Fat
Carbohydrates

ANSWER :D
Discussion
1959.

The %w/w of solvent in 40% NaOH solution is.,

Answer»

0.6
0.666
0.4
None

Answer :A
Discussion
1960.

Which of the following statements regarding valence bond theory (VBT) is not true?

Answer»

Covalent bond is a region of HIGH electron charge density that results by the overlap of atomic orbitals of two ATOMS
Each bond is formed by MAXIMUM overlap for its maximum stability
The potential energy of a DIATOMIC molecule is greater than the sum of potential energies of free atoms
Formation of a covalent bond between two atoms results by pairing of electrons present in the valence shell having OPPOSITE spins

Answer :C
Discussion
1961.

van't Hoff factor for K_(4)[FeC(N)_(6)] dissociated 10% is

Answer»

1.1
1.4
0.86
1.6

Answer :A::B::D
Discussion
1962.

(X)+K_(2)CO_(3)+"Air" overset("heat")(to)(Y) (Y)+Cl_(2) to (Z)pink Which of the following is correct?

Answer»

X=black,`MnO_(2)`, Y=Blue, `CrO_(4)`, Z=`KMnO_(4)`
X=Green, `Cr_(2)O_(3)`, Y=Yellow, `K_(2)CrO_(4)`, Z=`K_(2)Cr_(2)O_(7)`
X=black, `MnO_(2)`, Y=green, `K_(2)MnO_(4)`, Z=`KMnO_(4)`
X=black, `Bi_(2)O_(3)`, Y=colourless, `KBiO_(2)`, Z=`KBiO_(3)`

Solution :`underset(X)(2MnO_(2))+2K_(2)CO_(3) +underset("air")(O_(2)) overset(Delta)(to)underset("greenY")(2K_(2)MnO_(4)+2CO_(2)(uarr)`
`underset(Y)(2K_(2)MnO_(4))+Cl_(2) to underset("(Z) pink")(2KMnO_(4)) +2KCl`
Discussion
1963.

Which contains a triple bond?

Answer»

`SO_3`
HCN
`NH_3`
`C_2H_4`

ANSWER :D
Discussion
1964.

Which compound is added as foam stabiliser in froath floatation process?

Answer»

Toluene 
Benzene 
Aniline 
BENZOIC acid 

ANSWER :C
Discussion
1965.

There are mainly two types of adsorption of gases on solids. What are the two types of adsorption of gases?

Answer»


Answer :Physical ADSORPTION (PHYSISORPTION), CHEMICAL adsorption (CHEMISORPTION)
Discussion
1966.

The time required for 10% completion of a first order reaction at 298 K is equal to that required for its 25% completion at 308 k. If the value of A is 4xx10^(10)s^(-1). Calculate the rate constant, k at 318 k. 2.89xx10^(-2)s^(-1) 3.26xx10^(-2) s^(-1) 1.03xx10^(-2)s^(-1) 0.03xx10^(-2)s^(-1)

Answer»

the energy below which colloiding molecules will not react
the total energy of the reacting molecules at a temperature, T
The fraction of molecules with energy greater than the activation energy of the reaction
`0.03 xx 10^(-2) S^(-1)`

Solution :For first order reaction,
`k=(2.303)/(t)"LOG"[A]_(0)/([A])`
At 298 K,`K_(1)=(2.303)/(t)"log"(100)/(90)`
At 308 k,`k_(2)=(2.303)/(t)"log"(100)/(75)`
On dividing Eq.(ii) by Eq. (i), we get
`k_(2)/(k_(1))=(log""100/75)/(log""100/90)=2.73`
According to ARRHENIUS theory,
`log""k_(2)/k_(1)=E_(a)/(2.303R)xx(T_(2)-T_(1))/(T_(1)T_(2))`
`log2.73=E_(a)/(2.303 R)[(308-298)/(298xx308)]`
`E_(a)=76651 J" mol"^(-1)`
"Now, according to Arrhenius equation,"
`logk=logA-E_(a)/(2.303 RT)`
`logk=log(4xx10^(10))-(76651 J" mol"^(-1))/(2.303xx(8.314 J" mol"^(-1)k^(-1))xx(318 k))`
`=-1.9868`
k=Antilog `(-19868)=1.035xx10^(-2)s^(-1)`
Discussion
1967.

wedge_(NH_(4)OH)^(@) is ___________.

Answer»

`wedge_(NH_(4)OH)^(@)=wedge_(NH_(4)CL)^(@)+wedge_(NAOH)^(@)-wedge_(NaCl)^(@)`
`wedge_(NH_(4)OH)^(@)=wedge_(NH_(4)Cl)^(@)-wedge_(NaOH)^(@)-wedge_(NaCl)^(@)`
`wedge_(NH_(4)OH)^(@)=wedge_(NH_(4)OH)^(@)+wedge_(NaCl)^(@)-wedge_(NaCl)^(@)`
`wedge_(NH_(4)OH)^(@)=wedge_(NH_(4)Cl)^(@)+wedge_(NaCl)^(@)-wedge_(NaOH)^(@)`

Answer :A
Discussion
1968.

Which of the following complexes will give maximumnumber of isomers?

Answer»

`[CO(NH_(3))_(4)Cl_(2)]`
`[NI(en)(NH_(3))_(4)]^(2+)`
`[Ni(C_(2)O_(4))_(en)_(2)]^(2-)`
`[Cr(SCN)_(2)(NH_(3))_(4)]^(+)`

Solution :`[Cr(SCN)_(2))(NH_(3))_(4)]^(+)` SHOWS LINKAGE, geometrical and optical isomerism.
Discussion
1969.

Which noble gas does not occur in atmosphere?

Answer»

SOLUTION :Radan or RN.
Discussion
1970.

Write the organic compound formed in the following equations. ii) CH_(3)-overset(CH_(3))overset("|")"C "=O+H_(2)N-OHrarr iii) CH_(3)-Mg-Br+O=C=O underset(H_(3)O^(+))overset("Dry ether")rarr

Answer»

Solution :a)
ii) `CH_(3)-OVERSET(CH_(3))overset(|)C=+H_(2)N-OH rarr CH_(2)-overset(CH_(3))overset(|)C=N-OH`
iii) `CH_(3)-Mg-Br +O=C=O overset("DRY ether")underset(H_(3)O^(+))rarr CH_(3)-COOH`
Discussion
1971.

Which gives smell of burnt sugar on charring :

Answer»

Tartaric ACID
FORMIC acid
Oxalic acid
ACETIC acid

ANSWER :A
Discussion
1972.

Which mechanism is followed in the reaction of 2-methy1-2-propanol with HBr?

Answer»

`E_1` MECHANISM
`E_2` mechanism
`SN^2` mechanism
`SN^(1) `mechanism

SOLUTION :`SN^(1) `mechanism
Discussion
1973.

Which of the following does not form stable diatomic molecule ?

Answer»

Nitrogen
Phosphorus
Hydrogen
Oxygen

Answer :B
Discussion
1974.

Which of the following alkanes cannot be prepared by the Wurtz reaction in good yield ? (v) (CH_3)_3C-C(CH_3)_3

Answer»

Solution : a `3^@` ALKYL halide is REQUIRED. So , inspite of being a symmetrical alkane
cannot be PREPARED by Wurtz REACTION.
Discussion
1975.

Which of the following alkynes cannot be converted into a terminal alkyne when heated with NaNH_2/"paraffin"-

Answer»

`CH_3C-=C""CH_3`
`CH_3CH_2C-=C""CH_2CH_3`
`CH_3CH_2CH_2C-=C""CH_2CH_3`
`(CH_3)_2CHE-=C""CH(CH_3)_2`

ANSWER :D
Discussion
1976.

When glycerol is treated with P_2O_5 (or) KHSO_4 the product formed is ……………… .

Answer»

`CH_2 = CH- CH_3`
`CH_2=CH - CH_2OH`
`CH_2= CH - CHO`
`CH_2 = C =CH_2`

SOLUTION :`CH_2= CH - CHO`
Discussion
1977.

The units of Molarity are

Answer»

`"GMS. Lit"^(-1)`
`"moles. Lit"^(-1)`
`"equivalents. Lit"^(-1)`
`"moles. Kg"^(-1)`

ANSWER :B
Discussion
1978.

Why are vitamin A and vitamin C essential to us ? Give their important sources.

Answer»

Solution :The vitamin A deficiency causes Xerophthalmia, a medical condition in which the eyes cannot produce TEARS due to hardening of cornea and causes the night BLINDNESS. It is available in fish liver oil, carrots, BUTTER and milk. It promotes the growth and increase resistance to diseases.
Vitamin C deficiency causes Scurvy and pyorrhoea. Vitamin C increase the resistance of the body towards diseases. It MAINTAINS the healthy skin and helps to heal the cuts and abrasions. It is soluble in water and present in citrus fruits such as oranges, lemons, amla, tomatoes, green vegetables etc.
Discussion
1979.

Which reacts with both HCl and NaOH?

Answer»

CAO
`CO_2`
`N_2O_5`
ZnO

Answer :D
Discussion
1980.

Then choose the correct statement:-

Answer»

A:La
B:Se
E:Hf
All are incorrect

Answer :D
Discussion
1981.

Two separate bulbs contain ideal gases A and B respectively. The density of gas A is twice that of gas B and the molar mass of gas A is half that of gas. If the two gases are at the same temperature, the ratio of pressure of A to that of B is :

Answer»

1.4
2.2
3.`1//4`
4.`1//2`

Solution :`p = ( DRT)/( M )`
`p_(X) = ( d_(x) RT)/( M_(x))`
`p_(Y) = ( DY RT)/( M_(y))`
`( P_(x))/( P_(y)) = ( d_(x) //d_(y))/( M_(x) //M_(y)) = ( 2)/((1)/(2))= 4`
Discussion
1982.

What is the oxidation state of Co[Co(H_(2)O)_(5)Cl]^(2+) ?

Answer»

`+2`
`+3`
`+1`
`+4`

Solution :Since, the O.N of `SO_(4)^(2-)` is -2, therefore the total charge on the COMPLEX ion, `[Fe(H_(2)O)_(5)NO]` is +2. Since No is paramagnetic MOLECULE, its unpaired electron is transferred to iron. As a result, NO CARRIES +1 charge. Further, since `H_(2)O` is a neutral molecule, its O.N is ZERO. Putting the values of all the oxidation numbers, the O.N of Fe in the complex ion `= x+0 xx 5 + 1=2`
`:. n = +1`
Thu the O.N of Fe is +1 and the correct structure of the `|Fe(H_(2)O)_(5)NO|SO_(4)` is `|Fe^(+1)(H_(2)O)_(5)NO|SO_(4)`.
Discussion
1983.

What are the primary valencies ?

Answer»

Solution :Primary valencies are these valencies which the metals show in the formation of its simple salts
Examples: In the formation of `CuSO_4,CoCl_3,PtCl_4` the primary valency of Cu is 2, of cobalt is 3 and of PLATINUM is 4.
Discussion
1984.

Which of the following is ambidantate nucleophile?

Answer»

OH
`NH_(2)`
RO
CN

Answer :D
Discussion
1985.

Which one is good reducing agent (C or CO) for Fe_(2)O_(3), below 1073 K ?

Answer»

SOLUTION :(ii) Below 1073 K, CO is more effective because the `Delta G^(@)` value for the CONVERSION of CO into `CO_(2)` is more negative.
Discussion
1986.

What is the coordination number of each sphere in hexagonal close packed structure.

Answer»

SOLUTION :COORDINATION, NUMBER of each sphere in (i) HEP is 6
Discussion
1987.

Write down the IUPAC names of the following compounds: (i) CH_(3)CH_(2)underset(C_(2)H_(5))underset(|)(C)HCH_(2)underset(C_(2)H_(5))underset(|)(C)HCH_(3) (ii) (CH_3)_(3)C C_(2)H_(5) (iii) (CH_(3))_(2)CHCH_(2)C(CH_(3))_(3) (iv) (CH_(3))_(3)C-underset(CH_(2)CH_(3))underset(|)(C)H-CH(CH_(3))_(2) (v) CH_(3)CH_(2)CH_(2)underset(C(CH_(3))_(3))underset(|)(C)HCH_(2)CH_(2)CH_(3) (vi) (C_(2)H_(5))_(2)CHCH(C_(2)H_(5))_(2) (vii) CH_(3)CH_(2)overset(C_(2)H_(5))overset(|)(C)H-overset(C(CH_(3))_(3))overset(|)(C)H-CH_(2)CH_(2)CH(CH_(3))_(2)

Answer»

Solution :(i) 3 - ethyl - 5 - methyleptane,
(ii) 2,2 - DIMETHYLBUTANE
(III) 2,2,4 - trimethylpentane
(IV) 3 - ethyl - 2,2,4 - trimethylpentane
(V) 4 - (1,1 - dimethylethyl )HEPTANE
(vi) 3,4 - diethylhexane
(vii) 6 - methyl - 5 - (1,1 - dimethylethyl)octane
Discussion
1988.

Whichof the following statement(s) is/arenot correct for following compounds? (I)SCl_(2)(OCH_(3))_(2) and (II) SF_(2)(OCH_(3))_(2)

Answer»

`-OCH_(3)` groups in both cases OCCUPY the same position
Cl-atoms occupy EQUITORIAL position incase of (I) and F-atoms occupy equitorial position in CASE of (II)
Cl-atoms occupy axial position in case of (II) & F-atoms occupy equitorial position in case of (II)
Cl and F- atoms occupy EITHER axial or equitorial position in case of (I) and (II) respectively

Solution :
Discussion
1989.

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200 K to 400 K ? (R= 8.314"kJ"mol^(-1)K^(-1))

Answer»

`234.65"KJ MOL"^(-1)K^(-1)`
`434.65"kJ mol"^(-1)K^(-1)`
`434.65"J mol"^(-1)K^(-1)`
`334.65"kJ mol"^(-1)K^(-1)`

Solution :`T_1=200K,k=k_1`
`T_2=400K , k = k_2=2k_1`
`log ((k_2)/(k_1))=(2.303E_a)/R((T_2-T_1)/(T_1t_2))`
`log((2k_2)/(k_1))=(2.303E_a)/(8.314JK^(-1)mol^(-1))((400K-200K)/(200Kxx400K))`
`E_a=(0.3010xx8.314"J mol"^(-1)xx200xx400)/(2.303xx200)`
`E_a=434.65"J mol"^(-1)`
Discussion
1990.

Which of the following complexes show geometrical as well as optical isomerism ? (P) [Cr("ox")_(3)]^(3-) (Q) [Rh(en)_(2)Cl_(2)]^(+) (R ) [Co(NH_(3))_(2)(Cl)_(2)(en)]^(+) Select the correct answer using the codes given below :

Answer»

P only
P and Q only
Q and R only
All P, Q, R

Solution :`(Q) [M(A A)_(2)a_(2)]` SHOWS GI and OI.
Discussion
1991.

The reagent used to convert an alkyne to alkene is

Answer»

`Zn-Hg//HCl`
`Pd// H_(2)`
`Zn//HCl`
`Sn//HCl`

SOLUTION :Alkynes react READILY with hydrogen in thepresence of finely divided NI , Pt or Pd as catalyst . The reaction is called hydrogenation.
`HC-=CHunderset(pT or Pd)overset(H_(2),Nior)to CH_(2)=CH_(2)`
Discussion
1992.

What is the concentration of nitrate ions if equal volumes of 0.1 M AgNO_(3) and 0.1 M NaCl are mixed together

Answer»

0.1 N
0.2 M
0.05 M
0.25 M

Solution :`M_(1)V_(1)=M_(2)V_(2)`
`0.1xxV=M_(2)xx2V impliesM_(2)=(0.1xxV)/(2V)=0.05M`
Discussion
1993.

When an alkyl halide is allowed to react with a sodium alkoxide the product most likely is

Answer»

An aldehyde
A ketone
An ETHER
A CARBOXYLIC acid

Solution :`RX+RONa to R-underset("Ether")O-R+NaX`
It is a WILLIAMSON's SYNTHESIS REACTION.
Discussion
1994.

What is the correct sequence of the increasing order of freezing point at one atmosphere of the following 0.01 M aqueous solution? 1. Urea, 2. Potassium chloride, 3. potassium sulphate, 4. Potassium phosphate. Select the correct answer using the codes gives below

Answer»

3,4,1,2
3,4,2,1
4,3,1,2
4,3,2,1

Answer :D
Discussion
1995.

Which of the following alkyl halides mainly undergo reaction by SN^2mechanism.

Answer»

`CH_3Cl`
`(CH_3)_2 CHCL`
`(CH_3)_3"CCL"`

ANSWER :A
Discussion
1996.

What is meant by the chelate effect ? Give an example.

Answer»

SOLUTION :When a didentate or a polydentate ligand coordinates with the central metal ion FORMING a five or a six membered ring, the effect is CALLED chelate effect. As a resuit, the stability of the complex increases. For examples, the complex of `Ni^(2+)` with en is more stable than with `NH_(3)`.
`Ni^(2+)(aq)+6NH_(3)(aq)rArr[Ni(NH_(3))_(6)]^(2+),logbeta=8.61`
`Ni^(2+)(aq)+3en(aq)rArr[Ni(en)_(3)]^(2+),logbeta=18.28`
Discussion
1997.

X will be

Answer»

P-isomer
O-isomer
m-isomer
a and B both

Answer :A
Discussion
1998.

What is meantby positive deviations form Raoult's Law ? Give an example. What is the sing of DeltaH_("mixing") for positive ?

Answer»

SOLUTION :ETHANOL & CYCLOHEXANONE, `(DeltaH_("mixingn"))` is POSITIVE.
Discussion
1999.

What is the two dimensional coordination number of a molecule in square close packed layer ?

Answer»

Solution :SQUARE CLOSE packing : When the spheres of the second row are PLACED exactly above those of the first row. This WAY the spheres are aligned horizontally as WELL as vertically. The arrangement is AAA type. Coordination number is 4.
Discussion
2000.

There is formation of H_(2)O_(2) in the upper atmosphere. H_(2)O+O to 2 OH to H_(2)O_(2) DeltaH=72Kj mol^(-1), E_(a)=77Kjmol^(-1) What will be the E_(a) for bimolecular recombination of two OH radicals to form H_(2)O and O in Kj.

Answer»

SOLUTION :`5`
Discussion