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.

Sodium carbonate solution in water is alkaline due to

Answer»

hydrolysis of `NA^(+)`
hydrolysis of `CO_(3)^(2-)`
hydrolysis of both `Na^(+) and CO_(3)^(2-)` ions
none of these

Solution :Due to anionic hydrolysis
`CO_(3)^(2-)+H_(2)O HARR HCO_(3)^(-)+""^(-)OH`
Discussion
2.

Sodium carbonate solution in water is alkaline due to :

Answer»

HYDROLYSIS of `NA^+`
Hydrolysis of `CO_3^(2-)`
Hydrolysis of both `Na^+ and CO_3^(2-)` ions
None of the above

Answer :B
Discussion
3.

Sodium carbonate reacts with SO_2 in aqueous solution to give:

Answer»

`NaHCO_3`
`NaHSO_3`
`Na_2SO_3`
`NaHSO_4`

ANSWER :C
Discussion
4.

Sodium carbonate on heating gives:

Answer»

WATER vapours
Carbon DIOXIDE
Carbon dioxide+ Water vapour
None of the above

Answer :D
Discussion
5.

Sodium carbonate is manufactured by solvay process. The products those are recycled are:

Answer»

`CO_2` and `NH_3`
`CO_2` and `NH_4Cl`
NACL and CAO
`CaCl_2` and CaO

Answer :A
Discussion
6.

Sodium carbonate extract is acidified with HNO_(3) only in the identification of halides. Comment.

Answer»

Solution :`HCl` and `H_(2)SO_(4)` are not used, as the acids react with the TEST reagent `AgNO_(3)` and FORM ppt. of `AgCl` and `Ag_(2)SO_(4)` respectively because of this only `HNO_(3)` is used for the purpose.
Discussion
7.

Sodium carbonate is:

Answer»

Efflorescent
Deliquescent
Hygroscopic
Oxidant

Answer :A
Discussion
8.

Sodium carbonate cannot be used in place of ammonium carbonate for the precipitation of the fifth group radicals because

Answer»

SODIUM ions interfere with the DETECTION of fifth group radicals
Concentrations of CARBONATE ions is very low
Sodium will react with acidic radicals
Magnesium will be precipitated

Solution :When `(NH_(4))_(2)CO_(3)` is used then the concentration of `CO_(3)^(2-)` is comparatievely low but when `Na_(2)CO_(3)` is added then concentration of `CO_(3)^(2-)` increases so `Mg^(2+)` will be precipitated along with other V group radicals.
Discussion
9.

Sodium carbonate can be manufactured by Solvay process but potassium carbonate cannot be prepared because

Answer»

`K_2CO_3` is more SOLUBLE than `Na_2CO_3`
`K_2CO_3` is LESS soluble than `Na_2CO_3`
`KHCO_3` is more soluble than `NaHCO_3`
`KHCO_3` is less soluble than `NaHCO_3`

SOLUTION :`KHCO_3` is more soluble than `NaHCO_3`
Discussion
10.

Sodium carbonate and mixture are taken in (a)___ ratio white perparingsodiumcarbonateextract

Answer»


ANSWER :`3:1`
Discussion
11.

Sodium cannot be extracted by the electrolysis of brine solution because

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electrolysis cannot take place with brine solution.
sodium reacts with water to PRODUCE `NaOH+H_(2)`.
sodium being more electropositive than hydrogen `H_(2)` is liberated at CATHODE and not sodium.
none of these

Answer :C
Discussion
12.

Sodium connot be extracted by electrolysis of aqueous solutions due to

Answer»

Sodium is less REACTIVE
Sodium liberated reacts with `H_2O` and forms NAOH and `H_2`
Sodium has high VAPOUR PRESSURE
Preferential discharge theory

Answer :D
Discussion
13.

Sodium burns in dry air to give

Answer»

`Na_2O`
`Na_2O_2`
`NaO_2`
`Na_3N`

ANSWER :B
Discussion
14.

Sodium borate on reaction with H_(2)SO_(4) (conc.) and C_(2)H_(5)OH gives a compound 'A' which burns with green flame. The compound 'A' is

Answer»

`H_(2)B_(4)O_(7)`
`(C_(2)H_(5))_(2)B_(4)O_(7)`
`H_(3)BO_(3)`
`(C_(2)H_(5))_(3)BO_(3)`

ANSWER :D
Discussion
15.

Sodium borohydride reacts with iodine in the presence of diglyme to give A. A heated at 388 K give B. A heated at 373 K in sealed tube to form C. A further heated at red hot condition to give element D. Find out A,B, C and D. Give the reactions.

Answer»

Solution :(i) Sodium borohydride reacts with IODINE in the presence of DIGLYME to give diborane (A).
`2NaBH_(4)+I_(2)overset("diglyme")(to)underset((A))(B_(2)H_(6))+2NaI+H_(2)`
(ii) Diborane (A) heated at 388 K gives PENTABORANE (11)(B)
`underset((A))underset(("Diborane"))(5B_(2)H_(6))underset((U-"tube"))overset(388K)(to)underset((B))underset(("pentaborane-11"))(2B_(5)H_(11))+4H_(2)`
(iii) Diborane (A) heated at 373 K in the sealed tube to form decaborane (14)(C)
`underset((A))underset(("Diborane"))(5B_(2)H_(6))underset("sealed tube")overset(373K)(to)underset((C))underset(("decaborane"-14))(B_(10)H_(14)+8H_(2)`
(iv) Diborane (A) heated at red hot conditions to give element boron (D).
`underset((A))underset(("Diborane"))(B_(2)H_(6))overset("Red hot")(to)underset((D))underset(("Boron"))(2B)+3H_(2)`
Discussion
16.

Sodium bismuthate is

Answer»

a POWERFUL reducing-agent
used in the estimation of `Mn^(2+)` ions
a non-toichiometric compound
obtaine3d by treating `Bi_2O_3 "with conc. "NaOH`

Solution :Oxidation of `Mn^(2+)` ions is CARRIED out quantitively to `MnO_(4)^(-)` by warming with sodium bismuthate in excess of `HNO_(3)`
`2MN^(2+)+5NaBiO_(3)+14H^(+) to 2MnO_(4)^(-)+5Na^(-)+5Bi^(3+)+7H_(2)O`
(a). It is a strong oxidizing agent as shown in (b)
(c) It is a stoichiometric compound
(d). `BiO_(3)+6NaOH to 2Na_(3)Bi_3+3H_(2)O`
Discussion
17.

Sodium bicarbonate reacts with salicylic acid to form

Answer»

`C_(6)H_(5)O Na`


Answer :B
Discussion
18.

Sodium bicarbonate solution on adding to magnesium sulphate solution forms:

Answer»

MAGNESIUM bicarbonate
Magnesium hydroxide
Basic magnesium carbonate
Magnesium carbonate

Answer :D
Discussion
19.

Sodium bicarbonate is manufactured by:

Answer»

CYANIDE process
Thermite process
Contact process
Solvay process

Answer :D
Discussion
20.

Sodium hydroxide has :

Answer»

IONIC BOND
COVALENT bond
Hydrogen bond
All of these
Discussion
21.

Sodium bicarbonate has :

Answer»

IONIC BOND
COVALENT bond
Hydrogen bond
All of these

Answer :(d)
Discussion
22.

Sodium benzoate is used as ____.

Answer»

SOLUTION :FOOD PRESERVATIVE.
Discussion
23.

Sodium benzoate is the most important food preservative. Suggest reason.

Answer»

Solution :When sodium benzoate is used as FOOD preservative it is metabolised by the CONVERSION into hippuric ACID, which is FINALLY excreated in the URINE.
Discussion
24.

Sodium benzoate, salt of sorbic acid, acetic acid, sodium bi carbonate, sodium meta sulphite.

Answer»

SOLUTION :Sodium bi CARBONATE. It is a baking SODA WHEREAS others are food preservatives.
Discussion
25.

Sodium benzoate, sodium propionate calcium propitiate, sodium metal bisulphite, sodium thiosulphate Among them how many chemicals are not food preservatives

Answer»


SOLUTION :`Na_2S_2O_3` is not FOOD PRESERVATIVE
Discussion
26.

Sodium benzene sulphonate reacts with NaOH and then on acidic hydrolysis , it gives

Answer»

Phenol
Benzoic acid
Benzene
Disodium benzaldehyde

Solution :
Discussion
27.

Sodium atom crystallizes in body centered cubic with a=4.29 overset(@)A. The radius of sodium atom is

Answer»

`18.6 OVERSET(@)A`
`1.86overset(@)A`
`1.86`pm
1860pm

SOLUTION :`4r=sqrt(3)arArr r=(sqrt(3)a)/(4)=(1.732xx4.29)/(4)=1.86overset(@)A` .
Discussion
28.

Sodium atom reacts most readily with :

Answer»

`R-NH_2`
R-O-R
R-CHO
RCH_2OH

Answer :D
Discussion
29.

Sodium and potassium occur:

Answer»

In NATIVE state
In COMBINED state
In GASEOUS state
All of these

Answer :B
Discussion
30.

Sodium alkyl benzene sulphonate is used as

Answer»

Pesticides
Fertilizers
Soap
DETERGENTS

Solution :It is USED as detergents.
Discussion
31.

Sodium acetate reacts with acetyl chloride to give

Answer»

acetic acid
acetic anhydride
methyl ACETATE
ethyl acetate

SOLUTION :`underset("SOD. acetate") (CH_(3) COONa) + underset("acetyl chloride") (CH_(3)COCl) to (CH_(3)CO)_(2) O + NaCl`
Discussion
32.

Sodium acetate reacts with Ethanoyl chloride to form:

Answer»

ACETIC acid
Acetone
Acetic ANHYDRIDE
Sodium formate

Solution :Acetic anhydride
Discussion
33.

Sodium acetate and acetyl chloride react to give

Answer»

ACETIC ACID
Acetic ANHYDRIDE
Acetone
Sodium formate

Answer :B
Discussion
34.

Sodium acetamide smells like :

Answer»

GARLIC
ROTTEN egg
Pleasant
Reminiscents of mice

Answer :D
Discussion
35.

Sodalime test for detection of nitrogen cannot be used for :

Answer»

acetamide
urea
diazo compounds
thiourea

Answer :C
Discussion
36.

Sodalime test is used to detect .................element in an organic compound :

Answer»

C
H
N
S

Answer :C
Discussion
37.

Sodalime is extensively used in decarboxylation reaction to obtain alkanes. Sodalime is-

Answer»

NaOH
NaOH and CaO
CaO
`Na_(2)CO_(3)`

ANSWER :C
Discussion
38.

Soda water is of which type solution ?

Answer»

SOLID solution
LIQUID solution
Gaseous solution
NONE of these

Answer :B
Discussion
39.

Soda water is an example for ........

Answer»

gel
emulsion
FOAM
sol

Solution :foam
Discussion
40.

Soda-water is an Aerosol

Answer»

SOLUTION :LIQUID FOAM
Discussion
41.

Soda water has a PH value :

Answer»

LESS than 7
More than 7
7
Greater than 7

Answer :A
Discussion
42.

Soda lime is made from:

Answer»

`Na+CaO+H_(2)O`
`CaO+NaOH(AQ)`
`NaOH+CaCO_(3)`
`NaHCO_(3)+CaO`

ANSWER :B
Discussion
43.

Soda-lime is a specific reagent for

Answer»

DECARBOXYLATION
dehalogenation
dehydration
dehydrogenation

Answer :A
Discussion
44.

Soda lime is used extensively in decarboxylation reaction to obtain alkanes. Soda lime is:

Answer»

NaOH
NaOH and CaO
CaO
`Na_2CO_3`

ANSWER :B
Discussion
45.

Soda lime is:

Answer»

`Na_2CO_3 + CAO`
`NAOH + NaHCO_3`
`NaOH + CaO`
`NAH + Na_2CO_3`

ANSWER :C
Discussion
46.

Soda lime is

Answer»

NaOH
CaO
NaOH and CaO
`Na_(2)CO_(3)`

SOLUTION :NaOH +CaO is called SODA lime 3:1
Discussion
47.

Soda extractof a salt solution in acidified with excessof dil CH_(2)COOH and CaCI_(2) soinis added Awhite pptinsolable in CH_(3)COOH confurm of

Answer»

`C_(2)O_(4)^(2-)`
`CO_(3)^(2-)`
`HCO_(3)^(Theta)`
`S_(2)O_(3)^(2-)`

Answer :a
Discussion
48.

Soda ash is chemically:

Answer»

`Na_2CO_3.H_2O`
NAOH
`NaHCO_3`
`Na_2CO_3`

ANSWER :D
Discussion
49.

Soda ash is

Answer»

`Na_(2)CO_(3).H_(2)O`
NaOH
`Na_(2)CO_(3)`
`NaHCO_(3)`

ANSWER :C
Discussion
50.

Sod. Salt. (A)+ dil. HCl rarrSalt (B) +gas (X). (X) is colourless with suffocating odour and can turn lime water milky. (B)+K_(2)Cr_(2)O_(7)+ conc. H_(2)SO_(4)rarr coloured gas (Y). (A)+ Sulphur rarr Compound (C ). Which of the following is // are correct ?

Answer»

the OXIDATION no. of SULPHUR in (C) is `+2.5`
(Y) is `Cl_(2)`
(Y) is `CrO_(2)Cl_(2)`
`(X)` is `SO_(2)`

ANSWER :A,C,D
Discussion