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.

5651.

When 3g of ethane gas is brunt at 25^(@)C, 156 kJ of heat is liberated. If the standard enthalpies of formation for CO_(2)(g) and H_(2)O(l) are -393.5 and -285.8 kJ*mol^(-1) respectively, then for ethane gas-

Answer»

STANDARD HEAT of combustion`=-1560kJ*MOL^(-1)`
standard heat of formation`=-67.9kJ*mol^(-1)`
standard heat of combustion=-832`kJ*mol^(-1)`
standard heat of formation =-84.4`kJ*mol^(-1)`.

ANSWER :A::D
Discussion
5652.

Under identical conditions, the S_(N)l reaction will occur most efficiently with

Answer»

tert-butyl chloride
1-chlorobutane
2-methyl-1-chloropropane
2-chlorobutane.

Solution :As tert-butyl chloride will FORM `3^(@)` carbocation which is most stable THUS `S_(N)1` reaction will occur most efficiently with tert-butyl chloride.
Discussion
5653.

Write the formula of an oxo-anion of chromium (Cr) in which it shows the oxidation state equal to its group number.

Answer»

SOLUTION :`CrO_(4)^(2-)`
OXIDATION state of CR in `CrO_(4)^(2-)` is EQUAL to +6.
This is also the group number of Cr in the periodic table.
Discussion
5654.

Using the data (all values are in kJ/mole at 25^(@) C given below H_("combustion" )^(@)(ethane) = - 1559.8 , Delta H_("combustion")^(@)(ethene) = -1410.9 DeltaH_("combustion")^(@)(acetylene) = -1299.7 , Delta H_("combustion")^(@)(acetaldehyde) = -1192.3 Delta H_(f)^(@)CO_(2) (g) = -393 .5 , Delta H_(f)^(@)of H_(2) O (l) = -258.8 Delta H^(@) for C_((s)) (graphite) to C_((g)) = + 716.68 , Bond energy of H - H = 435.94 Bond energy of O = O = 498.94 Calculating the following bond energies : (i) C - C "" (ii)C - H (iii) C = 0 (iv) C = C (v) C = C

Answer»

SOLUTION :`C - C = 97.81 KJ , C - H = 454. 64 kJ , C = O = 804.26 kJ , C = C = 434.3 kJ, C = C = 733.48` kJ
Discussion
5655.

Which of the following options(s) is/are correct w.r.t. Henry's law? [Assuming solvent to be water]

Answer»

Value of `K_(H)` (Henry's constant) increases with increases in TEMPERATURE
Value of `K_(H)` (Henry's constant) will be more for `O_(2)` than for `H_(2)` at same temperature
Henry's law is not applicable for `HCl(g)`
Henry's law is applicable when solubility of GAS is low

Answer :A::C::D
Discussion
5656.

Write the reactions of aromatic and aliphatic primary amines withnitrous acid.

Answer»

Solution : AROMATIC primary amines reacts with `HNO_2`at 273-278 to from aromatic DIAZONIUM salts.

Aliphatic primary amines also react with HNO.. at 273-278 K to form aliphatic diazonium salts . But these are unstable even at low temperature and THUS decomposers readily to form a mixture of compounds CONSISTING of alkyl chlorides , alkenes and alcohols , out of which alcohols generally predominates.
`underset("Ethylamine")(CH_3CH_2NH_2)+NHO_2+HCloverset(-2H_2O)underset(273-278K)rarrunderset(("unstable"))underset("Ethanediazonium chloride")([CH_3CH_2-overset(+)N-=N]Cl^(-))overset(H_2O)rarrunderset("Ethanol")(CH_3CH_2OH)+N_2+HCl`
Discussion
5657.

Which of the following statements are correct about the kinetics of this reactions?

Answer»

The rate of REACTION DEPENDS on the concentration of only (II)
The rate of reaction depends on concentration of both (i) and (ii)
MOLECULARITY of reaction is one.
Molecularity of reaction is two.

Solution :(a,c) are both correct statements,
Discussion
5658.

The relation of the isoelectric point for an amino acid to solubility is:

Answer»

The TWO are not related
An amino acid is the LEAST SOLUBLE at the isoelectric point:An amino acid has the MAXIMUM solubility at the isoelectric point
Solubilities of only some amino acids depend on it

Answer :C
Discussion
5659.

Which of the following amines cannot be prepared by Gabriel's synthesis

Answer»

BUTYL amine
Isopropylamine
2-Phenylethylamine
N-Methyl amine.

Solution :N-Methylbenzylamine `(CH_(3)NHCH_(2)C_(6)H_(5))` being a `2^(@)` amine cannot be prepared by Gabriel's synthesis.
Discussion
5660.

Which of the following pair is used to prepare 2-ethoxy 2-methyl propane ?

Answer»

`(CH_3)_3C Cl+C_2H_5ONa`
`(CH_3)_3CONa + C_2H_5Cl`
`CH_3CH_2ONa + C_2H_5Cl`
`CH_3CH_2CH_2ONa + C_2H_5Cl`

ANSWER :B
Discussion
5661.

Which of the following statement is true about the complex [CrCl_(3)(OH)_(2)(NH_(3))]^(-2) ion ?

Answer»

It has 3 GEOMETRICAL isomers
Only one SPACE ISOMER is optically active and remaining are inactive
There are total four space isomers
The magnetic MOMENT of complex ion is 3.89 BM

Solution :`[Ma_(3)b_(2)c]^(npm)` ormula COMPOUND can have 3 geometrical isomers.
Discussion
5662.

What are the conditionsfor alloyformation ?

Answer»

Solution :(i) Accordingto Hume -Rotheryruleto forma SUBSTITUTE alloythe differencebetweenthe atomicradiiof solventand soluteis lessthan 15%
(ii) BOTHTHE solventand solutemust have thesamecrystalstructureand valenceand theirelectonegativitydifference mustbe CLOSETO zero.
Discussion
5663.

Which one of the following is NOT a synthetic detergent ?

Answer»

`CH_(3)(CH_(2))_(10)CH_(2)OSO_(3)^(-)Na^(+)`<BR>`[CH_(3)(CH_(2))_(15)-N-(CH_(3))_(3)]^(+) Br^(-)`
`CH_(3)(CH_(2))_(16)COO^(-)Na^(+)`
`CH_(3)(CH_(2))_(16)COO(CH_(2)CH_(2)O)_(n)CH_(2)CH_(2)OH`

Solution :A synthetic DETERGENT is the sodium salt of sulphonic acid which has cleansing properties in water. It consists of a long hydrocarbon chain which is hydrophobic and a SHORT ionic part which is hydrophilic. Examples (i) Sodium lauryl sulphate and (ii) Sodium n-dodecyl sulphate.
Discussion
5664.

Which of the following method is employed to distinguish optical isomers ?

Answer»

CHEMICAL TEST
Polarimetry
Spectroscopy
Boiling/Melting POINT determination.

Answer :B
Discussion
5665.

Which one of the following is formed when phenol reacts with a mixture of Conc.HNO_3 and Conc. H_2SO_4 ?

Answer»

ORTHO NITRO PHENOL
Para nitro phenol
1,2- dinitro phenol
2,4,6 trinitro phenol

SOLUTION :2,4,6 trinitro phenol
Discussion
5666.

which metal is present in vitamin B_(12) or cyanocobalamin?

Answer»

`FE`
`Co`
`MG`
`Pt`

ANSWER :B
Discussion
5667.

Which of the following show amphoteric behaviour?

Answer»

`ZN(OH)_(2)`
`Be(OH)_(2)`
`AL(OH)_(3)`
`PB(OH)_(2)`

Answer :A::B::C::D
Discussion
5668.

Which of the followingabout breeding is incorrect ?

Answer»




ANSWER :C
Discussion
5669.

Which one of the following act as an antioxidant?

Answer»

PALMITIC ACID
BUTYL hydroxy toluene
sodium benzoate
Ascorbic acid

SOLUTION :butyl hydroxy toluene
Discussion
5670.

Which one of the following structures represents nylon-6,6 polymer?

Answer»




ANSWER :A
Discussion
5671.

When HCl reacts with finely powdered iron, it forms ferrous chloride and not ferric chloride. Why ?

Answer»

Solution :Its reaction with iron produces `H_(2)`
`FE + 2HCl to FeCl_(2) + H_(2)(G)`
Liberation of hydrogen prevents the FORMATION of FERRIC chloride.
Discussion
5672.

What would you expect to be the general temperature and pressure conditionsfor an optimum yield of nitric oxide, NO, by the oxidation of ammonia?4NH_3(g) + 5O_2(g)iff4NO (g) + 6H_2O(g), Delta H lt 0

Answer»

SOLUTION :LOW TEMPERATURE and low PRESSURE
Discussion
5673.

Which one of the following is paramagnetic ?

Answer»

`N_(2)`
NO
CO
`F_(2)`

SOLUTION :NO molecule is paramagnetic.
Discussion
5674.

What is Brownian movement ?

Answer»

Solution :It involves the MOTION of COLLOIDAL PARTICLES in a zig-zag PATH.
Discussion
5675.

Which type of isomerism is most common among ethers:

Answer»

Chain
Position
Metamerism
Functional

Answer :C
Discussion
5676.

Which of the following has maximum number of unpaired d-electrons

Answer»

ZN
`Fe^(2+)`
`Ni^(3+)`
`Cu^(+)`

Answer :B
Discussion
5677.

What is the equilibrium expression for the reactionP_(4)(s)+50_(2)(g)hArrP_(4)O_(10)(s)

Answer»

`K_C = ([P_4O_(10)])/(5[P_4][O_2])`
`K_C = 1/([O_2]^5)`
`K_C = ([P_4O_(10)])/([P_4][O_2])`
`K_C = [O_2]^(5)`

ANSWER :B
Discussion
5678.

Write two differeneces between physisorption and chemisorption.

Answer»

Solution :When a FINELY divided solid is taken, its SURFACE area increases. As a result, its adsorption CAPACITY increases. This increases the RATE of the reaction.
Discussion
5679.

Which one of the following will be able to show geometrical isomerism ?

Answer»

`MA_(3)B` (SQUARE planer)
`MA_(2)B_(2)` (TETRAHEDRAL)
MABCD (Square planer)
MABCD (Tetrahedral).

Solution :Square planer COMPLEXES of the type MABCD will have three geometrical isomers as SHOWN below.
Discussion
5680.

Which of the following statement is correct for the complex K_(4)[Fe(CN)_(5)O_(2)] ? [Fe having t_(2g)^(6)e_(g^(0)) configuration ]

Answer»

`d^(2)sp^(3)` and diamagnetism
`sp^(3)d^(2)` and diamagnetism
`d^(2)sp^(3)` and paramagnetism
`sp^(3)d^(2)` and paramagnetism

Solution :`K_(4)[overset(2+)FE(CN)_(5)(overset(-1)O_(2))]^(4-)`
`d^(6) to d^(2)sp^(3)` and PARAMAGNETIC due to `O_(2)^(-)`.
Discussion
5681.

White phosphorus reacts with caustic soda to give PH_3 and NaH_2PO_2. This reaction is an example of:

Answer»

Oxidation
Reduction
Neutralisation
Oxidation and reduction

Answer :D
Discussion
5682.

Which of the following is a natural product ?

Answer»

Asparine
Ibuprofen
MORPHINE
Paracetmol

ANSWER :C
Discussion
5683.

The substances which affect the central nervous system and induce sleep are called

Answer»

ANTIPYRETICS
tranquilizers
analgesics
ANTI septic

Answer :B
Discussion
5684.

._(Z)X^(M) + ._(2)He^(4) rarr ._(15)P^(30) + ._(0)n^(1). Then

Answer»

`Z = 12, M = 27`
`Z = 13, M = 27`
`Z = 12, M = 17`
`Z = 13, M = 28`

SOLUTION :EQUATE ATOMIC no. and MASS no.
Discussion
5685.

when ammonium chloride is dissoved in water , the sloution becomes cold. The change is

Answer»

ENDOTHERMIC
exothermic
supercooling
NONE of these

Solution :the PROCESS is endothermic and takes up takes up HEAT from solution so that the solution becomes COLD.
Discussion
5686.

What is meant by order of a reaction being zero?

Answer»

Solution :The rate of reaction does not VARY with CONCENTRATION of the reaction and the reaction is very FAST.
Discussion
5687.

Write IUPAC names of the following : K_(3)[Fe(C_(2)O_(4))_(3)]

Answer»

SOLUTION :POTASSIUM trioxalatoferrate(III),
Discussion
5688.

Which reaction cannot be used for the preparation of halogen acid

Answer»

`CaF_(2) +H_(2) SO_(4"(conc)") +rarr CaSO_(4) + HF `
` NaHSO_(4) + NACL rarr Na_(2) SO_(4) + HCl`
` NaCl + H_(2) SO_("4(conc)") rarr NaHSO_(4) + HCl`
`2KBr +H_(2) SO_("4(conc)") rarr K_(2) SO_(4) + 2HBR`

Solution :`2KBr + H_(2) SO_(4"(conc)")rarr K_(2) SO_(4) + 2HBr`
Discussion
5689.

Which of the following solutions cannot act as a buffer

Answer»

`NaH_(2)PO_(4)+H_(3)PO_(4)`
`CH_(3)COOH + CH_(3)COONa`
`HCl+NH_(4)Cl`
`H_(3)PO_(4) + Na_(2)HPO_(4)`

SOLUTION :A strong ACID is not used to make a bufer.
Discussion
5690.

Which of the following method cannot be used inthe preparation of acid

Answer»

`R - COCl + H_(2)Oto`
`R - COOOC - R + H_(2) O to`
`R - COOR + H_(2) O overset(H^(+)) to `
`R - C -= N overset("NA + ethanol ") to `

ANSWER :D
Discussion
5691.

Which of the following reagents cannot be used to prepare an alkyl halide from an alcohol?

Answer»

`PCl_(5)`
`SOCl_(2)`
aqueous KCL
`ZnCl_(2)+HCl`

Answer :C
Discussion
5692.

Write the structure of major organic product in each of the following reactions : (a) (CH_(3))_(3)CBr + H_(2)O overset("heat") to "" (b) CH_(3)CH_(2)Cl + SbF_(3) overset("heat") to

Answer»

SOLUTION :`(a) (CH_(3))_(3)CBr + H_(2)O overset("heat") to (CH_(3))_(3)COH + HBr `
`(B) 3CH_(3)CH_(2)CL + SbF_(3) overset("heat") to 3CH_(3)CH_(2)F + SbCl_(3) `
Discussion
5693.

Which is formed when FeSO_4 reacts with an oxidising agent ?

Answer»

`FE(OH)SO_4`
`FeSO_4NO`
`Fe(OH)_2`
`Fe_2(SO_4)_3`

ANSWER :D
Discussion
5694.

Write simple chemical tests and observations used to distinguish between the following compounds. (i) Propanal and propanone

Answer»


Answer :Propanal REDUCES TOLLENS reagent to SILVER MIRROR but PROPANONE being a ketone does not.
Discussion
5695.

When B_(2)H_(6) is allowed to react with following lewis bases, then how man ygiven lewis bases form adduct through symmetrical cleavage of B_(2)H_(6)? NH_(3),MeNH_(2), Pyridine, CO,T.H.F,PH_(3),PF_(3),Me_(3)N,Me_(2)NH

Answer»


ANSWER :6
Discussion
5696.

Which among the following alkene on acid hydration will produce tertiary butyl alcohol?

Answer»

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

ANSWER :A
Discussion
5697.

Which of the statements are correct about above reaction?

Answer»

(i) and (V) both are nucleophiles.
In (iii), arbon atom is `SP^(3)` hybridised.
In (iv), carbon atom is `sp^(3)` hybridised.
(i) and (v) botha re electrophiles.

Solution :(a,C) are both correct statements,
Discussion
5698.

Which of the following metals is used in dry cells?

Answer»

Ni
Zn
Fe
Co

Answer :B
Discussion
5699.

Whichone of the followingon hydrolysisgivegalactoseand glucose ?

Answer»

Maltose
Cellulose
Lactose
SUCROSE

ANSWER :C
Discussion
5700.

Give electronic configuration of chlorine atom.

Answer»

SOLUTION :1s^2 2s^2 2p^6 3s^2 3p^5
Discussion