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.

6651.

When chloroform is treated with amine and KOH, we get

Answer»

ROSE LIKE odor.
bitter ALMOND like smell
offensive odor.
sour oil of winter green like smell

Answer :C
Discussion
6652.

Which of the following reaction take place at a faster rate

Answer»

`2Na_((s))+I_(2(s))rarr2NaI_((s))`
`2Na_((s))+I_(2(g))rarr2NaI_((s))`
`PbNO_3(s)+KI_((s))rarrPbI_((s))+KNO_3`
`underset("MARBLE")(CaCO_3)+OVERSET(dil)(HCl)rarrCaCl_2+H_2O+CO_2uarr`

Answer :B
Discussion
6653.

What is the effect of catalyst on activation energy?

Answer»

SOLUTION :Catalyst lowers down the activation energy .Because it PROVIDES altemate PATH to the REACTION .It forms unstable intermediate which readily CHANGES into products.
Discussion
6654.

Which statements are correct regarding copper sulphate?

Answer»

It reacts with `NAOH` and GLUCOSE to give `Cu_(2)O`
It reacts with KCl to give `Cu_(2)O`
It gives CuO on heating in air
It reacts with KI to give brown colouration

Answer :A::C::D
Discussion
6655.

Which of the following is correct match?

Answer»

A-i-II
B-iv-I
C-iii-I
D-ii-I

Answer :B
Discussion
6656.

Which is the correct order of boiling point of halomethane ?

Answer»

`CH_(3)F gt CH_(3)Cl gt CH_(3)Br gt CH_(3)I`
`CH_(3)Br gt CH_(3)I gt CH_(3)Cl gt CH_(3)F`
`CH_(3)I gt CH_(3)Br gt CH_(3)Cl gt CH_(3)F`
`CH_(3)F gt CH_(3)Br gt CH_(3)I gt CH_(3)Cl`

Solution :When the MASS and volume of the HALOGEN ATOM increases, then there will be an increase in repulsion FORCES of van der Waals.
Discussion
6657.

Which of the following indicates to 'regions of ordered structure within a protein'.

Answer»

PRIMARY structure
Secondary structure
Tertiary structure
Quaternary structure

Answer :B
Discussion
6658.

What is the action of concentrated nitric acid on copper? Give equation.

Answer»

Solution :Copper REACTS with concentrated `HNO_3`, reddish brown vapours of NITROGEN DIOXIDE is PRODUCED.
Discussion
6659.

Total charge on 1 mole of a monovalent metal ion is equal to

Answer»

`9.65xx10^(4)` coulomb
`6.28xx10^(18)` coulomb
`1.6xx10^(-19)` coulomb
None of these

Solution :One MOLE of monovalent metal ION means charge of N ELECTRON i.e., 96500 C or 1 faraday.
Discussion
6660.

When 1000 ml of a 1M solution of sulphuric acid is neutralised by a strong base in dilute solution, the standard enthalpy of neutralisation is

Answer»

`-57.1 KJ`
`-114.2 kJ`
`-28.55 kJ`
`+57.1 kJ`

Solution :1 M solution of `H_(2)SO_(4)` GIVES 2 equivalents of `H^(+)` IONS.
Discussion
6661.

To what extent do the electronic configurations decided the stability of oxidation states in the first series of the transition elements?

Answer»

SOLUTION :If an element has `d^(0), d^(5) or d^(10)` configuration in a PARTICULAR oxidation state, then they are STABLE EX:
(i) `Sc^(3+)` is stable because of `d^(0)` configuration. It is more stable than `Sc^(+)`.
(II) `V^(5+)` is more stable than `V^(3+)` because of `d^(0)` configuration.
(iii) `Mn^(2+)` is more stable than `Mn^(3+)` due to `d^(5)` configuration.
(iv) `Fe^(3+)` is more stable than `Fe^(2+)` due to `d^(5)` configuration.
(v) `Zn^(2+)` is more stable than `Zn^(+)` due to `d^(10)` configuration.
Discussion
6662.

Which of the following is a Lewis base

Answer»

`CH_(4)`
`C_(2)H_(5)OH`
Acetone
Secondary amine

Solution :Presence of lone PAIR of electron and they donate two electron pairs.
Discussion
6663.

What weight of AgCl will be precipated when a solution containing 4.77g of NaCl is added to a solution of 5.77g of AgNO_(3)

Answer»


ANSWER :`AgNO_(3)` is a limiting REAGENT in this PROBLEM
AgCl=4.87g
Discussion
6664.

Which one of the following is not an antibiotic?

Answer»

amoxicillin
cefixime
AMLODIPINE
ampicillin

Solution : amlodipine
Discussion
6665.

Which of the following compounds has ionicbond. pi-bond, co-ordinate bond and covalent bond:-

Answer»

`HNO_(2)`
`NaNO_(3)`
`KNO_(2)`
`MgCl_(2)`

Answer :B
Discussion
6666.

Which tow sets of reactants best represents the amphoteric character of Zn(OH)_(2) ? I. Zn(OH_(2))(S) and OH^(-)(aq) set 2. : Zn(OH)_(2)(s) and H_(2)O(1) Set 3 : Zn(OH)_2(s) and NH_(3)(aq)

Answer»

1 and 2
1 and 3
2 and 4
3 and 4

Solution :`{:(Zn(OH)_(2) + 2OH^(-) RARR ZnO_(2)^(2) + 2H_(2)O),("Acid ""Acid ""SALT "" Water" ):}`
`UNDERSET("BASE")(Zn(OH)_2) + underset("Acid")(2H^+)rarr underset("Salt")(Zn^(2+))+underset("Water")(2H_(2)O)`
Discussion
6667.

Write two differences between order of a reaction and molecularity of a reaction.

Answer»

SOLUTION :
Discussion
6668.

Which among the following alkane of formula (C_6H_14) gives five types of of C_6H_(13) (excluding stereoisomer) ?

Answer»




Solution :All five CARBONS in the main CHAIN are DIFFERENT HENCE will give five isomers in mono-substitution.
Discussion
6669.

Write the formula of nitric anhydride.

Answer»

SOLUTION :
Discussion
6670.

Which among the following is called fruit sugar?

Answer»

GLUCOSE
FRUCTOSE
SUCROSE
MALTOSE

SOLUTION :Fructose
Discussion
6671.

Which is/are correct about emulsions?

Answer»

Demulsification can take PLACE by chemical
methods only
Small amount of water cannot be mixed in
water-in-oil EMULSION
Sodium OLEATE is used to PREPARE oil-in-water
emulsion
Calcium oleate is used to prepare water-in-oil
emulsion

Answer :B::C::D
Discussion
6672.

Which of the following metals are used in alloy like deltametal?

Answer»

MG 
ZN 
CO 
CU 

ANSWER :D
Discussion
6673.

What do you mean by Enantiomers ?

Answer»


ANSWER :Non-superimposable MIRROR IMAGES are CALLED ENANTIOMERS.
Discussion
6674.

What are analgesics? Give one example for non-narcotic analgesie.

Answer»

Solution :The DRUGS which RELIEVE PAIN are called ANALGESICS, e.g. Aspirin, morphine.
Discussion
6675.

Which of the esters shown, after reduction with LiAlH_(4) and aqueous work up, will yield two molecules of only a single alcohol?

Answer»

`C_(6)H_(5)COOC_(6)H_(5)`
`CH_(3)CH_(2)COOCH_(2)CH_(3)`
`C_(6)H_(5)COOCH_(2)C_(6)H_(5)`
`CH_(3)COOCH_(3)`

Solution :Esters in which acyl and alkyl/aralkyl groups contain the same number of carbon atoms would GIVE two molecules of the same alcohol, i.e.,
`C_(6)H_(5)CO OCH_(2)C_(6)H_(5) underset((ii)" "H_(3)O^(+))overset((i)" "LiAlH_(4)//ether)to underset("Benzyl alcohol")(2C_(6)H_(5)CH_(2)OH)`
Discussion
6676.

Write the equations of anodic and cathodic reactions occur during rusting of iron.

Answer»

Solution :(i) At Anode : `2FE to 2Fe^(2+) + 4e^(-)`
(II)At CATHODE : `O_2 + 4H^(+) +4e^(-) to 2H_2O`
Discussion
6677.

Which of the following is true about photochemical smog ?

Answer»

It is reducing in nature
It is formed in water
It is a MIXTURE of SMOKE and fog
It CAUSES irritation in eyes.

Answer :D
Discussion
6678.

What is meant by unidentate, didentate and ambidentate ligands ? Give two examples for each.

Answer»

SOLUTION :A molecule or an ion having only one donor atom and FORMING one coordinate BOND with the central metal atom is called unidentate ligand. For example, `CL^(-)` and `NH_(3)`.
A molecule or an ion having two donor atoms and hence forming two coordinate bonds with the central metal atom is called a didentate ligand. For example,
A molecule or an ion which contains two donor atoms but only one of them forms a coordinate bond at a time with the central metal atom is called ambidentate ligand. For example, `CN^(-)` : or : `NC^(-)`:
Discussion
6679.

Which substances are used in aerosol mixtures of insectiside substance ?

Answer»

Feron - 22
`C ClF_(3)`
`C Cl_(2)F_(2)`
All of these

Answer :D
Discussion
6680.

Whichof the followingis wrongwithrespectto lanthanidecontraction ?

Answer»

DECREASE in IONICRADII
INCREASEIN tendencyto ACTAS reducingagents
Decreases in basiccharacter
Resemblessecondsand thirrowof d- BLOCKELEMENTS

Answer :D
Discussion
6681.

Which of the following compound can be used as artireeze in automobilie radiators ?

Answer»

METHANOL
ETHANOL
NEOPENTYL alcohol
ethan-1,2- DIOL

Solution :ethan-1,2- diol
Discussion
6682.

Which of the following reaction shows metal corrosion reaction in presence of H_(3)O^(+) ?

Answer»

`2H_(2)O_((l)) to O_(2(g)) +4H_((aq))^(+)+4e^(-)`
`2H_(2)O_((l))+2e^(-) to H_(2(g))+2OH_((aq))^(-)`
`O_(2(g))+4H_((aq))^(+)+4e^(-) to 2H_(2)O_((l))`
`O_(2(g))+2H_(2)O_((l))+4e^(-) to 4OH_((aq))^(-)`

Solution :REDUCTION REACTION is carried out on cathode. Only reaction of (C) SHOWS reduction reaction in presence of `H^(+)(H_(3)O^(+))`.
Discussion
6683.

Which of the following compound will give yellow precipitate with I_(2)//Na_(2)CO_(3)(aq) but does not respond to Cannizzaro reaction ?

Answer»

`(C_2H_5)_2CO`
` CH_3CHO`
` CH_2O`
`C_2H_5CH_2OH`

ANSWER :B
Discussion
6684.

Why are reactions of higher order less in number?

Answer»

SOLUTION :A reaction takes place DUE to collide of molecules. The chances for a LARGE number of molecules or ions to collide SIMULTANEOUSLY are LESS. Hence, the reactions of higher order are less.
Discussion
6685.

Which of the following phenomenon does not support the particle nature of electromagnetic radiation?

Answer»

PHOTOELECTRIC effect
Line SPECTRUM of hydrogen
Interference
Blackbody radiation

Answer :C
Discussion
6686.

Which among the following is not a borane

Answer»

`B_(2)H_(6)`
`B_(3)H_(6)`
`B_(4)H_(10)`
None of these

Solution :Borances fall into TWO categories
`(a) B_(n) H_((n+4))` (CALLED nido-boranes), `B_(2)H_(6)`
`(b) B_(n)H_((n+6))` (called archno-boranes) , `B_(4)H_(10)`
`B_(3)H_(6)` does NOTFALL into any of the above categories
Discussion
6687.

Which of the following compound has peroxide linkage ?

Answer»

`Pb_(2)O_(3)`
`SiO_(2)`
`PbO_(2)`
`CO_(2)`

Solution :It has peroxide linkage `O_(2)^(2-)`.
Discussion
6688.

Which of the following is used in manufacture of paints ?

Answer»

GLYPTAL
Dynel
THIOKOL
KEVLAR

ANSWER :A
Discussion
6689.

Total numberof CN^(-) ion that are present in ICN(liq.)

Answer»


Solution :`ICN(l) RARR(I_(2)(CN)^(+))+(I(CN)_(2))^(-)`
Discussion
6690.

What is the action of 2, 4-dinitrophenyl hydrazine on acetone ?

Answer»

SOLUTION :ACETONE on reaction with 2, 4-Dinitrophenyl hydrazine forms 2, 4-dinitrophenyl HYDRAZONE.
Discussion
6691.

Unit cells can be broadly classified into 2 categories primitive and centred unit cells.The unit cell dimension of a particular crystal system isa = b = c and alpha = beta = gamma = 90°. Identify the crystal system.

Answer»

SOLUTION :CUBIC CRYSTAL SYSTEM.
Discussion
6692.

The reason for double helical structure of DNA is operation of

Answer»

dipole-dipole interaction
HYDROGEN BONDING
electrostatic attractions
van DER WAALS' forces

Solution :Hydrogen bonding
Discussion
6693.

What happens when : (i) Ethanol is mixed with conc. H_(2)SO_(4) at 273K.

Answer»

Solution :Due to the presence of two lone pairs of electrons on the oxygen atom, alcohol acts as a Lewis BASE.
THEREFORE, at 273K, ethanol reacts with `H_(2)SO_(4)` to form oxonium salts (protonated alcohols).

(ii) Excess of ETHYL alcohol is heated with conc. `H_(2)SO_(4)` at 413K.
(iii) Ethanol is heated with excess of conc. `H_(2)SO_(4)` at 443K.
Discussion
6694.

Various phenol derivatives, tincture of iodine (2 - 3% I_(2) in water/alcohol) and some dyes like methylene blue are

Answer»

Antiseptic
Analgesics
Disinfectants
Antipyretics

Solution :Antiseptic drugs cause destruction of micro-organism that PRODUCE septic disease e.g., DETTOL, Savlon, Boric acid, PHENOL, Iodoform `KMnO_(4)` and some dye such as CHLORAMINE T METHYLENE blue, genation violet.
Discussion
6695.

Which of the following statement is incorrect for XeF_(6) ?

Answer»

Its PARTIAL hydrolysis gives `XeOF_(4)` and `XeO_(2)F_(2)` which is non-redox hydrolysis.
Its reaction with silica gives `XeOF_(4)`.
It is prepared by reaction of `XeF_(4)` and `O_(2)F_(2)`.
It disproportionates under water.

SOLUTION :`DeltaS=nF((dF)/(dT))=2xx96500xx2xx10^(-4)=38.6J`
at equilibrium `DeltaG=DeltaH-TDeltaS=0`
`DeltaH=TDeltaS=300xx38.6=11580J`
Discussion
6696.

What is the hybridization of nitrogen in NH_3 ?

Answer»

SP
`sp^2`
`sp^3`
`dsp^2`

ANSWER :C
Discussion
6697.

The shapes of SF_(4) and XeF_(2) respectively are

Answer»

TRIGONAL bipyramidal and trigonal bipyramidal
see-saw and LINEAR
T-shape and linear
square planar and trigonal bipyramidal

Solution :`SF_(4)` (`sp^(3)`d, see-saw) and `XeF_(2)` (`sp^(3)`d, linear).
Discussion
6698.

Which among the following elements of group -2 exhibits anomalous properties?

Answer»

Be
Mg
Ca
Ba

Solution :Be
Discussion
6699.

Write the cell reaction for the half cell Cl_((aq))^-)//AgCl_((s))Ag.

Answer»

SOLUTION :`AgCl_((s))+E^(-)rarr Ag_((s))+Cl^(-)`
Discussion
6700.

The standard reduction potentials of metal electrodes A,B,C and D are +0.14V,+0.34V,-0.74 V and -0.4V respectively, Which is the best reducing agent :

Answer»

A
B
C
D

Answer :C
Discussion