Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Following are a group of compounds showing acidic behaviour: Give the IUPAC names of these compounds.

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ANSWER :HCOOH-Methanoic ACID
`(##ANE_PKE_CHE_XII_C12_E02_006_S01##)`-PHENOL
`CH_3COO+F49H`-ETHANOIC acid `CH_3-CH_2-COOH`-PROPANOIC acid
2.

Following are a group of compounds showing acidic behaviour: Formic acid is stronger than acetic acid. Why?

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ANSWER :HCOOH (FORMIC acid) does not contain any GROUP having +I effect. But `CH_3COOH` contains `CH_3` group having +1 effect. PRESENCE of group with +I effect DECREASES acidity.
3.

Following acid can't not from alpha-amino acid

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succinic acid
tryptophane
PHENYL ALANINE
TYROSINE

ANSWER :A
4.

Following 2^(@) amine has chiral carbon as indicated H-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-NH_(2). This on reaction with NaNO_(2)+ HCl, from

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`1^(@)` alcohol with REACTION of CONFIGURATION
`2^(@)` alcohol with inverted configuration
recemic mixture of `2^(@)` alcohol
recemic mixture of `1^(@)` alcohol.

Answer :C
5.

Following are a group of compounds showing acidic behaviour:does not contain carboxylic group, still it is acidic. Why?

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Answer :The PHENOXIDE ion formed by the ionisation of phenol is more stabilised by resonance than phenol. So phenol IONISES to form phenoxide and `H^+` IONS and behave as acid.
6.

Following alkene will give same product by any method out of hydration, hydroboration - oxidation :

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`CH_3CH=CH_2`
`CH_3CH=CHCH_3`
`CH_3undersetunderset(CH_3)|CHCH=CH_2`

ANSWER :B
7.

Following 1^(0)aminehaschircal centreCH_(3)CHNH_(2)C_(2)H This on reactionswith NaNO_(2) + HCl froms

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`1^(0)` alcohol with RETENTION of configuartion
`2^(0)`alcoholwithinvertedconfiguartion
racemicmixtureof `2^(0)` alcohol
racemic mixture of `1^(0)`alcohol

Answer :C
8.

Fog is colloidal solution of :

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GAS in LIQUID
Solid in gas
Gas in gas
Liquid in gas

Solution :Liquid in gas
9.

Fog is colloidal solution of ...........

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solid in GAS
gas in gas
liquid in gas
gas in liquid

SOLUTION :DISPERSION medium-gas
DISPERSED phase-liquid
10.

Fog is colloidal solution of -

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LIQUID in gas
Gas in liquid
Solid in gas
Gas in gas

Answer :A
11.

Fog is a _______ colloidal solution.

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GAS in LIQUID
solid in gas
gas in gas
liquid in gas

SOLUTION :AEROSOL of liquid
12.

Fog is an example of what?

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DISPERSION of LIQUID in GAS 
Dispersion of gas in gas 
Dispersion of SOLID in gas 
Dispersion of solid in liquid 

ANSWER :A
13.

What is an emulsion ?

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SOLUTION :AEROSOL of LIQUID
14.

Fog is colloidal solution of

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LIQUID DISPERSED in gas
Gas dispersed in gas
Solid dispersed in gas
Solid dispersed in liquid

Answer :A
15.

Fog is an example of a colloid system of:

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LIQUID PARTICLES DISPERSED in GAS
gas particles dispersed in gas
SOLID particles dispersed in gas
solid particles dispersed in liquid

Answer :A
16.

Fog is an example of .........

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SOLID sol
Sol
AEROSOL
Gel 

SOLUTION :Aerosol
17.

Fog is an example of colloidal system of :

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Liquid DISPERSED in gas
Gas dispersed in gas
Solid dispersed in gas
Solid dispersed in liquid

Solution :FOG is an EXAMPLE of liquid dispersed in gas.
18.

Fog is a ......... type of colloidal sol.

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solid-gas
gas-liquid
liquid-gas
gas-gas

Answer :C
19.

For the reaction : 3CIO^(-) rarr CIO_(3)^(-) +2CI^(-) various steps are : CIO^(-) +CIO^(-) rarr CIO_(2)^(-)+CI^(-) (slow ) CIO_(2)^(-)+ CIO^(-) rarr CIO_(3)^(-)+CI^(-) (fast ) the order of the reaction is :

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1
2
0
3

Solution :(B) ORDER CORRESPONDS to SLOW STEP
20.

Fog is a colloidal solution of

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SMOKE
Milk
Fog
Cheese.

Answer :A
21.

Foam rubber is an example of .........

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SOLID sol
AEROSOL
Sol
Emulsion 

SOLUTION :Aerosol
22.

flying bird isan example of

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CLOSED system
open system
isolated system
microscopic system

SOLUTION :flying BIRD gives up energy and takes in air `(O_(2)`.
23.

Flux is used to remove

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ACIDIC IMPURITIES
basic impurities
all impurities from ores
both (A) and (B)

ANSWER :D
24.

Flux is added to

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OBTAIN PURE METAL
obtain metal from ore
purify IMPURE metal
remove IMPURITIES from ores

Answer :D
25.

Flux is a substances which is used to convert

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MINERAL into silicate
INFUSIBLE IMPURITIES to soluble impurities
Soluble impurities to infusible impurities
All of these

Answer :B
26.

Flux combines with slag to form gangue.True or False

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SOLUTION :FLUX COMBINES with gangue to FORM SLAG.
27.

Flux combineswith infusibleimpurities toform………. .

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ANSWER :SLAG
28.

Flux.

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Solution :A flux is a chemical substance which is added to the CONCENTRATED ore during smelting in ORDER to remove the GANGUE or IMPURITIES by chemical reaction forming a fusible mass called slag.
29.

Flurobenzene (C_(6)H_(5)F) can be synthesized in the laboratory

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By heating phenol with HF and KF
Form aniline by diazotisation following by heating the DIAZONIUM salt with `HBF_(4)`
By direct FLUORINATION of enzene with `F_(2)` gas
By reacting bromobenzene with NAF solution

Solution :.
30.

Flurobenzene (C_(6)H_(5)F) can be synthesised in the laboratory

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by heatingphenol with HF and KF
From alinile by diazotisation followed by HEATING the DIAZONIUM salt with `HBF_(4)`
by DIRECT fluorination of BENZENE with `F_(2)` gas
by reacting bromobenzene with NaF solution

Answer :B
31.

Fluorspar and cryolite have the formula___________ and ___________ respectively.

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SOLUTION :`CaF_2, Na_3AlF_6`
32.

Fluorspar is :

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`CaF_2`
CAO
`H_2F_2`
`CaCO_3`

ANSWER :A
33.

Fluorspar, cryolite and fluoroapatite are the minerals containing

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P
Cl
F
Ba

Solution :F
34.

Fluorosis, the base disease is caused by the presence of

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PESTICIDES in water
Fluorosis in water
CO in AIR
`SO_(2)` in air

Answer :B
35.

Fluoroboric acid is used as catalyst in preparation of ether from

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SODIUM alkoxide
diazomethane
ALKYL halide
acetone

Answer :B
36.

Fluorobenzene is prepared conveniently

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by HEATING benzene diazonium tetrafluoroborate
by TREATING benzene with fluorine
by the ACTION of PHENOL with `SF_4`
by treating benzene with `CH_3F` in presence of anhydrous `AlCl_3`

ANSWER :A
37.

Fluorobenzene is prepared by treating benzene diazonium chloride with fluoroboric acid and heating the product obtained. This reaction is known as :

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Schiemann REACTION
SANDMEYER reaction
GATTERMANN reaction
Ulmann reaction

ANSWER :A
38.

Fluorobenzene can be synthesised in the laboratory

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by heating PHENOL with HF and KF
from aniline by diazotisation followed by heating diazonium salt with HF
by direct FLUORINATION of benzene with FLUORINE gas
by reacting bromobenzene with NaF solution.

Solution :Is the correct answer the REACTION is called bal schiemann reaction.
39.

Fluorobenzene can be synthesised in the laboratory:

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from ANILINE by diazotisation followed by heating the diazonium salt with `HBF_(4)`.
by direct fluorination of benzene with `F_(2)` gas.
by reacting bromobenzene with `NAF` solution.
by heating phenol with `HF and KF`.

Solution :
40.

Fluorobenzene can be prepared from benzene diazonium chloride by heating with:

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fluoroboric acid followed by HEATING
aqueous KF
`F_(2)` in the PRESENCE of CS_(2)`
`H_(3)PO_(2)` followed by heating with KF

Solution :
41.

Fluoro acetic acid is stronger than chloro acetic acid.

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ANSWER :A::C
42.

Fluorine the I^(st) member of group 17^(th) differs from the other members of the group in many respects due to the following reasons. (i) Small size(ii) Hight EN(iii) absence of 'd' orbitals (iv) its Delta H dissociation in molecular form of X_(2) is the least.The most basic among the following

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Cl-Cl
F-F
I-I
Br-Br

Solution :Down the GROUP BOND enthalpy decreases and in `F_(2)` internuclear and itnerelectronic repulsions DECREASED bond ENERGY.
43.

Fluoro acetic acid is more acidic than iodoacetic acid. Give reason.

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SOLUTION :Acidity increases with increasing electro negativity of the substituents. F is more electro NEGATIVE
`F-CH_2 – COOH gtCI – CH_2 COOHgtBr – CH_2 – COOH gt I- CH_2- COOH`
So FLUORO acetic ACID is more acidic than iodoacetic acid.
44.

Fluorine shows anamolous behaviours in VILA group due to

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its SMALL size
high ELECTRO negativity
absence of d-orbitasl
All

Answer :D
45.

Fluorine reacts with water to form :

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FLUORINE water
Oxygen
OZONE
Oxygen, ozone

ANSWER :D
46.

Fluorine reacts with uranium to form UF_(6). U(s)+3F_(2)(g)rarrUF_(6)(g) How many fluorine molecules are required to produce 2 mg of UF_(6) from an excess of uranium? The molar mass of UF_(6) is 352 g "mol"^(-1).

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`3.4xx10^(18)`
`1XX10^(19)`
`2xx10^(19)`
`3.4xx10^(21)`

Answer :B
47.

Fluorine reacts with water to give

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Oxygen
Ozone
Hydrogen Fluoride
None of these

Solution :Fluorine REACTS with water (vigourously ) GIVEN `O_(2)`& `O_(3)`
`2H_(2) O + 2F_(2) rarr 4HF + O_(2) , 3H_(2) O + 3F_(2) rarr 6HF + O_(3)`
48.

Fluorine reacts with water giving

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HF and `O_2`
HF and `OF_2`
HF and `O_3`
HF, `O_2` and `O_3`

ANSWER :D
49.

Fluorine provides the largest variety of interhalogen compounds among halogens, why?

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SOLUTION :It is because fluorine is smallest in size, most electronegative and is the STRONGEST oxidising AGENT.
50.

Fluorine never acts as the central atom in polyatomic interhalogen compounds. Or Why does fluorine not play the role of a central atom in interhalogen compounds ?

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Solution :The reasons are :
(i) F being SMALLEST cannot accommodate larger SIZED other halogen ATOMS it.
(ii) Due to the absence of d-orbitals, F does not show positive oxidation states of +3, +5 or +7 needed for the formation of POLYATOMIC INTERHALOGEN compounds