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.

5851.

Which of the following has smallest heat of hydrogenation per mole ?

Answer»

1-Butene
TRANS-2-butene
Cis-2-butene
1, 3-Butadiene

Solution :The heat of HYDROGENATION of any alkene DEPENDS upon its stability. Since trans 2-butene is the most STABLE alkene, its heat of hydrogenation is LEAST.
Discussion
5852.

The best method to separate the mixture of ortho and para nitrophenol (1 : 1) is

Answer»

CRYSTALLIZATION
Solubility
Sublimation
STEAM distillation

Answer :D
Discussion
5853.

Which of the following ions has maximum flocculation value :

Answer»

`[Fe(CN)_(6))]^(4-)`
`Cl^(-)`
`SO_(4)^(2-)`
`PO_(4)^(3-)`

Solution :Smaller the charge on COAGULATING ION, HIGHER the flocculation value.
Discussion
5854.

VB theory was proposed by ………….

Answer»

ALFRED Werner
Bethe and VAN vleck
Linus Pauling
Louis DE Bronglie

Answer :A::C
Discussion
5855.

Which solution will have least vapour pressure ?

Answer»

0.1 M `BaCl_2`
0.1 M urea
0.1 M `Na_2SO_4`
0.1 M `Na_3PO_4`

ANSWER :D
Discussion
5856.

Which of the following is the strongest reducing agent?

Answer»

HCOOH
`CH_3 COOH`
`C_6H_5COOH`
`ClCH_2COOH`

ANSWER :A
Discussion
5857.

Which of the following does not contain protein ?

Answer»

MILK
Pulses
Cane sugar
Fish

ANSWER :C
Discussion
5858.

Transition metals form alloys with other transition metals. Explain.

Answer»

Solution :Transition metals FORM a large variety of alloys. This is due to the fact that transition metals have almost similar sizes and therefore, the atoms of one metal can EASILY SUBSTITUTE the atoms of other metals in their lattices. When we cool the mixture solution of two or more transition metals, solid alloys are generally formed. For example, manganese dissolves in molten iron to form manganese steel. The alloys formed are hard, having high melting points. These are also RESISTANT to corrosion in COMPARISON to the parent metals. Tungsten is also used for preparing stainless steel.
Discussion
5859.

Which of the following statements is correct about the role of substances added inthe forth flotation process ?

Answer»

COLLECTORS enhance the non-wettability of the ore particle.
Froth stabilizers increases non-wettability of the gangue.
Depressants MIXES the DIFFERENT sulphides.
Water WETTED the ore particles.

Answer :A
Discussion
5860.

Which one of the following relationship is not correct ?

Answer»

Specific conductance (K) = Observed conductance (C) `xx` cell CONSTANT
EQ. conductance `(LAMBDA) = (k xx 1000)/("Normality")`
Degree of DISSOCIATION `|(alpha)| = (Lambda_(0))/(Lambda_(c))`
`E_("cell")^(@) = (0.0591)/(n) "log" K_(c)` at 298 K

Solution :`alpha = (Lambda_(c))/(Lambda_(o))`
Discussion
5861.

What is the likely configuration of the cobalt d-electrons for the speciesCoCl_(6)^(3-) and Co(NO_(2))_(6)^(3-)?

Answer»

`CoCl_(6)^(3-)` : low spin , `Co(NO_(2))_(6)^(3-)` , low spin
`CoCl_(6)^(3-)` , HIGH spin ,` Co(NO_(2))_(6)^(3-)` : low spin
`CoCl_(6)^(3-)` : low spin , `Co(NO_(2))_(6)^(3-)` : high spin
`CoCl_(6)^(3-)` : high spin `,Co(NO_(2))_(6)^(3-)`: high spin

Solution :Weak field ligands (LIKE `Cl^(-)`) giving low value of `Delta_(0)` formhigh spin OCTAHEDRAL complexes whereas strongfield ligands (like `NO_(2)^(-)`) give rise to low spin (spin paired) complexs.
Discussion
5862.

Which of the following compounds loses optical activity due to pyramidal inversion ?

Answer»




SOLUTION :`3^(@)` amines losses optical activity due to PYRAMIDAL INVERSION
Discussion
5863.

What are A and B in the following ?

Answer»


ANSWER :(A) `(##ALN_CHM_C09(II)_E01_767_A01##)` (`NaBH_(4)` reduces KETO group)
(B) `(##ALN_CHM_C09(II)_E01_767_A02##)` (by interamolecular esterification)
Discussion
5864.

Total number of carbon atoms present in parent chain is: CH_(3)-underset(|)overset(CH_(3))overset(|)(C )-CH_(3) CH_(3)-CH_(2)-CH_(2)-underset(|)(C )-CH_(2)-CH_(2)-CH_(2) CH_(3)-CH_(2)-underset(CH_(3))underset(|)(C )-CH_(2)-CH_(2)-CH_(3)

Answer»

5
6
7
None of these

Answer :D
Discussion
5865.

The standard E_(red)^(@) values of A,Band C are + 0.68 V-254 V - 0.50 V respectively the order of their reducing power is

Answer»

`AGTBGTC`
`gtC GTB`
`CgtBgtA`
`BgtCgtA`

Solution :Reducingcharacteris based upon higher negative value of REDUCTION electrode potential
ORDER of reducing character is `BgtC GTA`
Discussion
5866.

The substrate will be binded to the active site of the enzyme through a) Ionic binding b) Hydogen bonding c) van der Waals interactions d) Dipole-dipole interactions Correct answer is

Answer»

a, B and C only
b, c and d only
a, b and d only
a, b, c and d

Answer :D
Discussion
5867.

The reagents which can be used to distinguish acetophenone from benzophenone is (are)

Answer»

2,4-Dinitrophenyl hydrazine
Aqueous solution of `NaHSO_(3)`
BENEDICT reagent
Iodine and `Na_(2)CO_(3)`

ANSWER :D
Discussion
5868.

Write the structure of p-Bromochlorobenzene.

Answer»

SOLUTION :The STRUCTURE of p-Bromochlorobenzene is
Discussion
5869.

Which of the following statements is incorrect for PCl_(5) ?

Answer»

Its three `P-Cl` bond LENGTHS are equal
It INVOLVES `sp^(3)d` hybridization
It has an REGULAR geometry
Its shape is trigonal bipyramidal

Answer :C
Discussion
5870.

The total number of valency electrons in PH_4^+ion is :

Answer»

8
9
6
14

Answer :A
Discussion
5871.

Which of the following molecules invovles the formation ofdpi -p pi bonding ?

Answer»

Trimethylamine
Carbon monoxide
trisilylamine
`C_(3)O_(2)`

SOLUTION :In trisilylamine there is `p pi-d pi` bonding between N atom and SILICON ATOMS of silyl group.
Discussion
5872.

Which of the following two oxides of nitrogen have 30.5% nitrogen?

Answer»

NO
`NO_(2)`
`N_(2)O_(4)`
`N_(2)O_(5)`

SOLUTION :Percentage of nitrogen in `NO_(2)=(14)/(46)xx100=30.5%`
Percentage of nitrogen in `N_(2)O_(4)=(28)/(92)xx100=30.5%`
Discussion
5873.

Which can act as a protective colloid

Answer»

SILICA GEL
`C Cl_(4)`
Gelatine
Oil

Answer :C
Discussion
5874.

Write the anodic reaction taking place at H_(2)-O_(2) fuel cell.

Answer»

SOLUTION :`2H_(2)+4OH^(-)rarr4H_(2)O+4e^(-)`.
Discussion
5875.

Which of the following compounds is most reactive towards nucleophilic acylsubstitution :-

Answer»

SOLUTION :CL is very GOOD LEAVING GROUP
Discussion
5876.

Which one of the following product is formed when glyeerol is oxidised with acidified KMnO_4 ?

Answer»

Meso oxalic acid
Oxalic acid
FORMIC acid
GLYCERIC acid

SOLUTION :Oxalic acid
Discussion
5877.

Which of the following is not required in the Solvay's process for the manufacture of Na_2CO_3?

Answer»

`NH_3`
`CO_2`
NaCl
CO

Answer :D
Discussion
5878.

What is the harmful effect of hyperacidity ?

Answer»

SOLUTION :HYPERACIDITY causes ULCER DEVELOPMENT in stomach.
Discussion
5879.

The relative lowering of vapour pressure produced by dissolving 71.5 g of substance in 1000g of water is 0.0173. The molecular mass of the substance will be:

Answer»

74.39
18
342
60

Solution :`(P_(1)^(@)-P)/P_(1)^(@)=(W_(2) XX M_(1))/(M_(2) xx W_(1))=(71.5 xx 18)/(M_(2) xx 1000)` `:. M_(2)=(71.5 xx 18)/(0.0173 xx 1000)=74.39`
Discussion
5880.

When ethene is heated at 350-370 K under a pressure of 1000-2000 atm in presence of trace of oxygen or peroxide .............is obtained.

Answer»


ANSWER :LOW DENSITY POLYTHENE
Discussion
5881.

Which one of the following proteins transports oxygen in the blood stream:

Answer»

Myoglobin
Insulin
Albumin
Haemoglobin

Answer :D
Discussion
5882.

Which of the following statements is incorrect regarding physiosorption ?

Answer»

It occurs because of van WALLS forces
More easily liquefiable GASES are adsorbed readily
Underhigh pressure, it resulting into multimolecular layer on ADSORBENT surface
Enthalpy of adsorption `(DELTA H_("adsorption"))` is LOW and positive

Solution :Enthalpy of adsorption is always negative.
Discussion
5883.

Which of the following isa catalyst used in fuel cell

Answer»

Hg
Ag
FE
PB

Solution :In FUEL CELL , Ag . Pt , Pd are used as a catalyst .
Discussion
5884.

Thermally more stable hydride is

Answer»

`NH_3`
`PH_3`
`AsH_3`
`BiH_3`

ANSWER :A
Discussion
5885.

Which of the following is most likely structure of CrCl_3 6H_2O if 1/3 of total chlorine of the compound is precipitated by adding AgNO_3 to its aqueous solution

Answer»

`CrCI_3.6H_2O`
`[CR(H_2O)_3CI_3].(H_2O)_3`
`[CrCI_2(H_2O)_4].CI 2H_2O`
`[CrCI_2(H_2O)_5]CI_2.H_2O`

ANSWER :C
Discussion
5886.

Which of the following statements are correct-

Answer»

S -S BOND is presentin `H_(2)S_(2)O_(8)`
in peroxosulphuric acid`(H_(2)SO_(5))` SULPHURIS in +6 OXIDATIONSTATE
iron POWDER along with `Al_(2)O_(3)`and `K_(2)O`is usedas a catalyst in the preparationof `NH_(3)`by Haber'sprocess
changeinethalpy is posititvefor thpreparationof `SO_(3)`by catalyticoxidationof `SO_(2)`

Answer :A
Discussion
5887.

Which of the following regarding diborane is correct ? (I) It is a colourless and toxic gas. (II) It undergoes spontaneous combustion in presence of oxygen forming B_(2)O_(3). (III) It can be obtained by reduction of BF_(3) by following reaction. 2BF_(3)+6NaHoverset(180^(@)C)rarrB_(2)H_(6)+6NaF (IV) It undergoes hydrolysis forming boric acid and hydrogen gas. Correct code is :

Answer»

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

Solution :`V_(2)O_(5)` preferiably forms oxycation because it is amphoteric METAL oxide.
Discussion
5888.

Which among the following is a polyester?

Answer»

Teflon
PVC
Nylon 6, 6
Terylene

Answer :D
Discussion
5889.

Which of the following forms of iron has highest melting point ?

Answer»

PIG IRON
Cast iron
Steel
Wrought iron

ANSWER :D
Discussion
5890.

Under identical condition of temperature and pressure, 1 litre of CH_(4) weighted 1.2 gram while 2 litre of another gaseous hydrocarbon, C_(n) H_(2n-2) weighted 8.1 gram. What is the value of n ?

Answer»


ANSWER :4
Discussion
5891.

Which of the following will not produce a precipitate with AgNO_(3) solution

Answer»

`F^(-)`
`Br^(-)`
`CO_(3)^(2-)`
`PO_(4)^(3-)`

Solution :With `F^(-)`, no precipitate is obtained because of low lattice energy of AgF, so it remains in IONIZED state.
Discussion
5892.

What is the other name for Frenkel defect ?

Answer»

SOLUTION :DISLOCATION DEFECT
Discussion
5893.

The rise of a liquid in a capillary tube is due to:

Answer»

osmosis
surface TENSION (C) viscosity
viscosity
diffusion

Answer :B
Discussion
5894.

What are the uses of acetic anhydride?

Answer»

SOLUTION :Acetic anhydride is used
(i) acetylating agent (II) in the preparation of medicine like asprin and phenacetin (iii) for the MANUFACTURE plastics like cellulose ACETATE and poly vinyl acetate.
Discussion
5895.

Why are low spin tetrahedral complexes rarely observed ?

Answer»

Solution :For tetrahedral COMPLEXES, `Deltat = (4//9)Delta_(0)`. Thus crystal field SPLITTING energies are not large. Therefore, pairing of ELECTRONS does not take place and low spin configurations are rarely OBSERVED.
Discussion
5896.

Which ofthe following is most basic?

Answer»

Benzylamine
Aniline
Acetanilide
p-Nitroaniline

Solution :Benzelamine is most BASIC.
Discussion
5897.

Which of the following is acidic oxides ?

Answer»

`HClSO_(4)`
`MGO`
`Al_(2)O_(3)`
`CAO`

Answer :A
Discussion
5898.

Which of the following are characteristics of thermosetting polymers ?

Answer»

HEAVILY branched cross linked polymers.
LINEAR slightly branched long chain MOLECULES.
Become infusible on moulding so cannot be reused.
SOFTEN on heating and HARDEN on cooling, can be reused.

Answer :A::C
Discussion
5899.

When Na reacts with glycerine, it forms:

Answer»

MANO SODIUM salt
Di-sodium salt
Tri-sodium salt
All

Answer :B
Discussion
5900.

Toluene reacts with a halogen in the presence of Fe(III) chloride giving ortho and para halo compounds. The reaction is

Answer»

ELECTROPHILIC elimination REACTION.
electrophilic substitution reaction.
free RADICAL ADDITION reaction.
nucleophilic substitution reaction.

ANSWER :b
Discussion