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.

The purple colour of which compound is in lassigne's solution in sulphur test?

Answer»

`Na_(4)[FE(CN)_(6)NOS]`
`Na_(2)[Fe(CN)_(5)NOS]`
`Na_(2) [Fe(CN)_(6)]S`
`Na_(4) [Fe(CN)_(4)NOS]`

ANSWER :B
Discussion
2.

The purity of H_(2)O_(2) in a given sample is 85%. The weight of impure sample of H_(2)O_(2) which required 10 ml of M//5 KMnO_(4) solution in a titration in acidic medium is 0.1 x.Find x?

Answer»


Solution :M EQ `MnO_(4)^(Theta)` = m eq of `H_(2)O_(2)`
`10xx(1)/(5)xx5` = m eq of `H_(2)O_(2)`
m. eq `H_(2)O_(2)` = 100 MEQ
WEIGHT of `H_(2)O_(2)=10xx10^(-3)xx(34)/(2)=0.17gm`
wt of imure `H_(2)O_(2)=(100)/(85)xx0.17=0.2gm`
Discussion
3.

The purity of an organic solid is checked by its

Answer»

Sharp M.P
Mixed M.P
Ability to SUBLIME
Tendency to DISSOLVE in an ORGANIC solvent

Solution :The purity of an organic SOLID is INDICATED by its sharp m.p.
Discussion
4.

The purity of an organic compound is determined by

Answer»

DENSITY
melting point
mixed melting point
molecular mass

Solution :In this process, we determine the melting POINTS of a NUMBER of SAMPLES obtained by mixing the ORGANIC compound in different ratios. If the compound is pure, different samples will have identical melting points.
Discussion
5.

The purity of an organic compound is determined by ............ .

Answer»

Chromatography
Crystallisation
melting or BOILING point
both (a) and (C)

ANSWER :D
Discussion
6.

The purification of the colloidal particles from crystalloid dimensions through semipermeable membrane is known as

Answer»

Coagluation
Dialysis
Ultrafiltration
Peptisation

Answer :B
Discussion
7.

The purification of aniline is occurred by which technique?

Answer»

Extraction by solvent
Steam DISTILLATION
VACCUM distillation
Fractional distillation

Answer :B
Discussion
8.

The purification method of bauxite containing iron oxide as impurity is known as

Answer»

Hoope's PROCESS
Serpeck's process
Baeyer's process
Electrolytic process

Solution :RED bauxite(bauxite with iron oxide as IMPURITY) is PURIFIED by Beyer's process.
Discussion
9.

The purest form of carbon is

Answer»

BITUMINOUS COAL
Coal-tar
coal gas
diamond

Solution :PUREST form of CARBON is Diamond
Discussion
10.

The purest and the densest variety of carbon is ..........

Answer»

SOLUTION :DIAMOND
Discussion
11.

The pure hydrogen (99.9%) can be made by which of the following processes ?

Answer»

Mixing natural HYDROCARBONS of high molecular mass
Electrolysis of water
Reaction of salt like HYDRIDES with water
Reaction of METHANE with steam

Answer :B
Discussion
12.

The pure crystalline substance on being heated graduallyfirst forms a turbid liquid at constant temperature and still higher temperature turbidity completely disappears. The behaviour is a characteristic of substance forming

Answer»

ALLOTROPIC crystal
LIQUID CRYSTALS
Isomeric crystals
Isomorphous crystals

Solution :Liquid crystals.
Discussion
13.

The pupils of eyes are dilated with a very dilute solution of an alkaloid which is :

Answer»

adrenaline
atropine
equanil
ephedrine

Answer :B
Discussion
14.

The Prussian blue colour obtained in the Lassaigne' s test for nitrogen is due to the formation of

Answer»

Iron (II) hexacyanoferrate (III)
Iron (III) hexacyanoferrate (II)
Iron (III) hexacyanoferrate (III)
Sodium hexacyanoferrate (III)

ANSWER :B
Discussion
15.

The prussian blue colour obtained during the test for nitrogen by Lassaigne.s test is due to the formationof

Answer»

`[FE(CN)_6]_3`
`Na_3[Fe(CN)_6]`
`Fe_3(Fe(CN)_6)_4`
`Na_4[Fe(CN)_5NOS]`

Answer :A
Discussion
16.

The violet colour obtained during the test of sulphur Lassaigne's test is due to the formation of

Answer»

`Fe_(4)[Fe(CN)_(6)]_(3)`
`Na_(3)[Fe(CN)_(6)]`
`Fe_(3)(Fe(CN)_(6))_(4)`
`Na_(4)[Fe(CN)_(5)NOS]`

Solution :Prussian blue is ferric FERROCYANIDE`Fe_(4)[Fe(CN)_(6)]_(3)`.
Discussion
17.

The prssure in bulb dropped from 2000 to 1500 mm of Hg in 47 minutes when the contained O_(2) leaked through a small hole. The bulb was then completely evacuated A mixture of O_(2) and another gas of mol wt79 in the molar ratio 1:1 at a total pressure of 4000 mm of Hg was introduced Find the mole ratio of two gases remaining in the bulb after a period of 74 minutes .

Answer»


ANSWER :0.00071048611111111
Discussion
18.

The Prussian blue colour confirms the presence of nitrogen in an organic compound is due the formation of ............ .

Answer»

SOLUTION :`Fe_(4)[FE(CN)_(6)]_(3)`
Discussion
19.

The proton is heavier than an electron by _______.

Answer»

1850 times
1840 times
1000 times
100 times

Answer :B
Discussion
20.

The property of hydrogen which distinguishes it from other alkali metals is

Answer»

Its ELECTROPOSITIVE CHARACTER
Its AFFINITY for non-metals
Its REDUCING character
Its non-metallic character

ANSWER :D
Discussion
21.

The property of hydroge which distinguishes it from all metal is

Answer»

Its electropositive CHARACTER
Its affinity for NON METAL
Its REDUCING character
Its non-METALLIC character

Solution :Non metallic character
Discussion
22.

The property of crystalline solid is not

Answer»

anisotropic
isotropic
hard
dense

Answer :B
Discussion
23.

The property of crystallinesolid is not

Answer»

anisotropic
isotropic
hard
dense

ANSWER :C
Discussion
24.

What are the two properties of carbon that make it capble of forming a large number of compounds ?

Answer»


ANSWER :catenatiom
Discussion
25.

The property of an element that is not normals determined directly but is obtained indirectly using Born-Haber cycle

Answer»

IONISATION potential
Electronic affinity
Electronegativity
Electropositive character

Answer :B
Discussion
26.

The property of a system which depends only on the nature of the substance contained in the system but not on the amount of the substance is called "…................" property.

Answer»

SOLUTION :INTENSIVE
Discussion
27.

The propertiesas of alkali meterls are mentioed in List-I Match tyhier order of change as Present inList_II The correct match is

Answer»

`{:(A,B,C,D),(4,3,2,1):}`
4,3,1,2
3,4,1,2
3,4,2,1

Answer :1
Discussion
28.

The properties of the elements are the periodic function of their atomic number. The statement is given by

Answer»

N. bohr
J.W. dobereiner
D.I . MENDELEEV
H.G. J moselely

Solution :Mosely.
Discussion
29.

The proper value of significant figures in 38.0 +0.0035+0.00003 is.

Answer»

38
38.0035
38.00353
38

Answer :D
Discussion
30.

The progress of the reaction A nB with time t is shown in Fig. From this information answer the following questions The equilibrium constant K_C is

Answer»

1.2
1.4
1.6
1.8

Solution :`K_(C)=((0.6)^(2))/(0.3)=1.2`
Discussion
31.

The progress of the reaction A harr nB with time t is shown in Fig. From this information answer the following question The value of n, is

Answer»

1
2
3
4

Solution :
at equilibrium 0.3 MOLES of A REACTED to GIVE 0.6 moles of B
`implies n=(0.6)/(0.3)=2`
Discussion
32.

The product(s) via-oxymercuration (HgSO_4+H_2SO_4) of 1-Butyne would be :

Answer»

`CH_3-CH_2-oversetoverset(O)(||)C-CH_3`
`CH_3-CH_2-CH_2-CHO`
`CH_3-CH_2-CHO+HCHO`
`CH_3-CH_2-COOH+HCOOH`

ANSWER :A
Discussion
33.

The products P and Q in the following sequence of reactions, are

Answer»




SOLUTION :
More NUCLEOPHILIC ALKENE WIL ATTACK.
Discussion
34.

The product(s) of the following reactions sequence is(are)

Answer»




SOLUTION :N//A
Discussion
35.

The products of the following reactions is C_2H_5Br + 2Na+ CH_3Br underset"Propane"overset"dry ether"to?

Answer»

ETHANE
PROPANE
BUTANE
ethane, propane and butane

Solution :Ethane, propane and butane
Discussion
36.

The products of the following reaction are ______________, respectively. i. C_(2)H_(5)OH overset("hot. "Al_(2)O_(3))rarr ii. C_(2)H_(5)OH overset("hot Cu")rarr

Answer»

ACETALDEHYDE, ethene
ethene, acetaldehyde
ethane, ethanol
ethanol, ETHYLENE oxide

Answer :B
Discussion
37.

The products of the following reaction are, SiO_(2)+Coverset(Delta)to

Answer»

Si,C and `CO_(2)`
Si,O and CO
Si C and CO
Si and `CO_(2)`

SOLUTION :`SiO_(2)+C overset(Delta)(rarr)SiC + CO `
Discussion
38.

The products of ozonolysis of an alkene are ethanl and methanal, then that alkene is

Answer»

`CH_(3)-C-=C-CH_(3)`
`CH_(3)-CH=CH-CH_(3)`
`CH_(3)-CH=CH_(2)`
`CH_(3)-C-=CH`

ANSWER :C
Discussion
39.

The products of oxidation of phopshrous acid by hot concentrated sulphuirc acid are………..and………… .

Answer»


Answer :`H_(3)PO_(4),SO_(2)andH_(2)O,i.e.,H_(3)PO_(3)+H_(3)SO_(4)overset(Delta)toH_(3)PO_(4)+SO_(2)+H_(2)O`
Discussion
40.

The products of combustion of an aliphatic thiol (RSH) at 298 K are

Answer»

`CO_(2)(g), H_(2)O(g)` and `SO_(2)(g)`
`CO_(2)(g), H_(2)O(l)` and `SO_(2)(g)`
`CO_(2)(l), H_(2)O(l)` and `SO_(2)(g)`
`CO_(2)(g), H_(2)O(l)` and `SO_(2)(l)`

Solution :`RSH+O_(2) RARR CO_(2)(g)+H_(2)O(l)+SO_(2)(g)`
Discussion
41.

The products of electrolysis of concentrated common salt solution are

Answer»

`Na+Cl_(2)`
`NAOH+H_(2)Cl_(2)`
`H_(2)+O_(2)`
`Na0H+CI_(2)+O_(2)`

SOLUTION :Aqueous NACI on electrolysis it gives NaOH `H_(2)` and `CI_(2)`
Discussion
42.

The product(s) obtained via oxymercuration (HgSO_4 + H_2SO_4) of 1-butyne would give

Answer»

`CH_3CH_2-oversetoversetO(||)C-CH_3`
`CH_3CH_2CH_2-CHO`
`CH_3CH_2CHO+HCHO`
`CH_3CH_2COOH + HCOOH`

SOLUTION :`underset"1-Butyne"(CH_3CH_2C-=CH+H_2O)underset"Mark. ADDN."OVERSET(HgSO_4+H_2SO_4)to [CH_3CH_2-undersetunderset(OH)|C=CH_2]overset"Tautomerises"toCH_3CH_2-CO-CH_3`
Discussion
43.

The products obtained on heating LiNO_(3) will be

Answer»

`LiNO_(2) + O_(2)`
`Li_(2)O + NO_(2) + O_(2)`
`Li_(3)N + O_(2)`
`Li_(2)O + NO + O_(2)`

Solution :`4LiNO_(3) overset(Delta)(to) 2 Li_(2)O + 4 NO_(2) + O_(2)`.
Discussion
44.

The products formed when acetic anhydride is treated with ammonia in excess is/are

Answer»

`2CH_(3)COONH_(4)`
`2CH_(3)CONH_(4)`
`CH_(3)CONH_(2) + CH_(3)COONH_(4)`
`2CH_(3)COOH`

Solution :`(CH_(3)CO)_(2)O + 2NH_(3) RARR CH_(3)CONH_(2) + CH_(3)COONH_(4)`
Discussion
45.

The products formed when boron trichloride is reduced with lithium aluminium hydride are

Answer»

`B_(2)H_(6) and HCl`
`B_(2)H_(6) and AlCl_(3)`
`BCl_(3) and AlCl_(3)`
`B_(2)H_(6), AlCl_(3)and LICL`

Answer :D
Discussion
46.

The products formed when a mixture of the following two amides( I and II) are treated with bromine and aqueous KOH are

Answer»




a mixture of all of these

Solution :It is HOFMANN bromamide REACTION. Hofmann reaction involves an intramolecular rearrangement. So, no cross products are FORMED even if we MIX together two different AMIDES in the reaction.
Discussion
47.

The products formed are :

Answer»

`CH_(3)-OVERSET(O)overset(||)(C)-CHO`
`CHO-CHO`
`CH_(3)-overset(O)overset(||)(C)-overset(O)overset(||)(C)-CH_(3)`
HCOOH

Answer :`(a,B)`
Discussion
48.

The products formed during the cracking long chain hydrocarbon C_(6)H_(12), are .......

Answer»

SOLUTION :`C_(6)H_(6)+3H_(2)`
Discussion
49.

The products for the following reactions are (i) CH_(3)-underset(H)underset(|)overset(Br)overset(|)(C)-CH_(2)-CH_(3)+"alc. KOH"to X (ii) CH_(3)-underset(CH_(3))underset(|)(C)H-CH=CH_(2) overset(O_(3))to Y+Z

Answer»

`X=(CH_(3))_(2)C=CH_(2),Y=CH_(3)CH_(2)CHO,Z=CH_(3)CH_(2)CHO`
`X=CH_(2)=CH_(2),Y=CH_(3)CHO,Z=CH_(3)COOH`
`X=CH_(3)-CH=CH-CH_(3)`
`Y=CH_(3)-overset(CH_(3))overset(|)(C)H-CHO,Z=HCHO`
`X=CH_(3)-CH=C(CH_(3))_(2),Y=HCHO,Z=CH_(3)CHO`

Solution :
Discussion
50.

The products expected to be formedin the Wurtz reaction of a mixture of neopentyl bromide and isobutyl bromide are (i)2,2,4-trimethylpentane (ii)2,2,5,5-tetramethylhexane (iii)2,2,4,4-tetramethylhexane (iv)2,5-dimethyl hexane (v)2,2,5-trimethylhexane

Answer»

(ii),(iii) and (v)
(ii), (iv) and (v)
(i),(iv) and (v)
(i) , (iii) and (v)

Solution :`UNDERSET"Neopentyl bromide (A)"(CH_3-undersetunderset(CH_3)|oversetoverset(CH_3)|C-CH_2Br)+underset"Isobutyl bromide (B)"(BrCH_2-oversetoverset(CH_3)|CH-CH_3)underset"(Wurtz REACTION)"overset("Na/dry ether,"Delta)to underset"(DIMERIZATION PRODUCT of A)"underset"2,2,5,5-Tetramethylhexane (ii)"(CH_3-undersetunderset(CH_3)|oversetoverset(CH_3)|(.^2C)-CH_2-CH_2-undersetunderset(CH_3)|oversetoverset(CH_3)|(.^5C)-CH_3)+underset"(Dimerization product of B)"underset"2,5-Dimethylhexane (iv)"(CH_3-oversetoverset(CH_3)|(.^2CH)-CH_2-CH_2-oversetoverset(CH_3)|(.^5CH)-CH_3)+underset"(CROSS product of A and B)"underset"2,2,5-Trimethylhexane (v)"(CH_3-undersetunderset(CH_3)|oversetoverset(CH_3)|(.^2C)-CH_2-CH_2-oversetoverset(CH_3)|(.^5CH)-CH_3)`
Discussion