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.

In the extraction of silver from argentite ore the ore is treated witlh dilute solution of NaCN in water in the presence of Y, whereby the following reaction takes place Ag_(2)X + 4NaCN +2Y rarr 2Na [ Ag(CN)_2] + Na_2XO_4 X and Y in this reaction are represented by

Answer»

Cl and S
S and `O_2`
`O and O_2`
`O and S`

SOLUTION :`Ag_2S + 4NaCN + 2O_2 rarr 2NA [Ag(CN)_2] + Na_2SO_4`
X is S and Y is `O_(2)`
Discussion
2.

In the givenr reaction: [A] and [B] respectively be:

Answer»




Both are `HO-CH_(2)-CH_(2)-CH_(2)-underset(OH)underset(|)(C)H-CH_(2)OH`

Solution :`LiAlH_(4)` is STRONG REDUCING agent & can reduce ester as WELL as ketone. While `NaBH_(4)` can reduce ketone, aldehyde & CARBONYL chloride.
Discussion
3.

In the given statements the number of statements are incorrect Statement-1 : Hydrated Cu(II) salts are blue and anhydrated salts Cu(II) salts are colourless. Statement-2 : HgCl_(2) A white sublimable substance that in solution forms a white precipitate with NH_(3) Statement-3: Separation of Cu^(+2) and Zn^(+2) ions is not possible by using NaOH. Statement-4 : Pb^(+2), Ag^(+) cations can be separated by using an NH_(3) solution.

Answer»


SOLUTION :In the given statements the NUMBER of statements are incorrect
Statement-I : Hydrated Cu(II) SALTS are blue and anhydrated salts Cu(II) salts are colourless.
Statement-2 : `HgCl_(2)` A white sublimable substance that in solution forms a white precipitate with `NH_(3)`
Statement-3 : Separation of `Cu^(+2)` and `Zn^(+2)` ions is not possible by using NAOH.
Statement-4 : `PB^(+2), Ag^(+)` cations can be separated by using an `NH_(3)` solution.
Discussion
4.

In the given transformation the reactant (A) is

Answer»

2,2-dichloropropane
1,2-dichloropropane
1,1-dichloropropane
1,3-dichloropropane.

Solution :The COMPOUND (A) is 2,2-dichloropropropane. The REACTION INVOLVED are as FOLLOWS
Discussion
5.

In the extraction of silver from argentite are the one is treated with dilute solution of NaCN in water in the presence of Y, whereby the following reaction takes place. Ag_(2)X+4NaCN+2Y to 2Na[Ag(CN)_(2)]+Na_(2)XO_(4)X and Y in this reaction are repesented by

Answer»

CL and S
S and `O_2`
O and `O_2`
O and S

ANSWER :B
Discussion
6.

In the extraction of silver by Mac-arther cyanide process, a small of KNO_(3) is also added as a flux. The function of KNO_(3) is:

Answer»

to oxidise Ag in the native form to `Ag^(+)`
to oxidise lead and ZINC impurities
to form a complec with `Ag^(+)` which is then REDUCED to metallic SILVER by using zinc
to oxidise the sulphur in the argentite ore to `SO_(2)` which escapes from the reaction

Answer :B
Discussion
7.

In the given structure of a compound, the correct various bond moments direction involving atoms are shown as

Answer»

Br = N = `CH_(2) = SiH_(2) = CH_(2) = O = CH_(3)`
Br = N = `CH_(2) = SiH_(2) = CH_(Z) = O=CH_(3)`
`Br = N = CH_(2) = SiH(z) = CH_(2) = O = CH_(3)`
`Br = N = CH_(z) = SiH_(z) = CH_(z) = O = CH_(3)`

Answer :C
Discussion
8.

In the given statements the number of statements are correct Statement-1 : Ammonia solution can be separate a mixture of AgCl and AgI. Statement-2 : ZnS, NiS, MnS sulphides are insoluble in dil.HCI Statement-3 : Hg_(2)Cl_(2) leaves black residue on addition of NH_(3) Statement-4 : AI^(3+), Mg^(+2) cations can be separated by adding NH_(4)Cl and NH_(4)OH to the mixture. Statement-5 : A white precipitate is obtained when H_(2)S is passed through a solution of ZnSO_(4)

Answer»


Solution :In the given statements the number of statements are CORRECT
Statement-1 : Ammonia solution can be separate a mixture of AgCl and AgI.
Statement-2 : ZnS, NiS, MNS sulphides are insoluble in dil.HCI
Statement-3 : `Hg_(2)CI_(2)` leaves black residue on ADDITION of `NH_(3)`.
Statement-4 : `Al^(+3), Mg^(+2)` cations can be separated by adding `NH_(4)Cl` and `NH_(4)OH` to the mixture.
Statement-5 : A white precipitate is obtained when `H_(2)S` is passed through a solution of `ZnSO_(4)`
Discussion
9.

In the extraction of magnesium from magnesium chloride, sodium chloride helps

Answer»

lower the conductivity of `MgCl_(2)`
RISE the conductivity of `MgCl_(2)`
lower the MELTING point of `MgCl_(2)`
`Change the SOLID state structure of `MgCl_(2)`

Answer :C
Discussion
10.

In the given set of reactions, " 2 bromopropane"overset(Alc.AgCN)(to) 'X' overset(LiAlH_4)(to) 'Y'. Identify the product Y and give its IUPAC name.

Answer»

SOLUTION :
Discussion
11.

In the extraction of lead from its ore galena, an important element recovered is:

Answer»

Au
Ag
Cr
C

Answer :B
Discussion
12.

In the extraction of lead from its or galena am inportant element recovered is

Answer»

Au
Ag
Cr
C

Solution :In the EXTRACTION of LEAD from its ORE galena an important ELEMENT recovered is Silver
Discussion
13.

In the given set of reactions: 2-Bromopropaneunderset("heat")overset("alc. AgCN")to X overset(LiAlH_(4))toY The IUPAC name of the product Y is

Answer»

N-isopropylmethanamine
N-methylpropan-2-amine
N-methylpropanamine
butan-2-amine

Solution :
Discussion
14.

In the given set of reactions : 2-Bromopropane underset("alc./heat")overset(AgCN)rarrXoverset(LiAlH_(4))rarrY the IUPAC name of product 'Y' is

Answer»

Butan-2-amine
N-Methylpropanamine
N-Methylpropan-2-amine
N-Isopropylmethanamine

Solution :`underset("2-Bromopropane")(CH_(3)-underset(CH_(3))underset("|")(CH)-Br)underset("Alc./heat")OVERSET(AgCN)rarrCH_(3)-underset((X))underset(CH_(3))underset(|)(CH)-NCunderset(("Reduction"))overset(LiAlH_(4))rarrCH_(3)-underset((Y))underset("N-Methylpropan-2-amine")underset(CH_(3))underset(|)(CH)-NH-CH_(3)`
Discussion
15.

In the extraction of iron, the slag produced is :

Answer»

`CO`
`FeSiO_3`
`MgSiO_3`
`CaSiO_3`

ANSWER :D
Discussion
16.

In the given sequence of first order reaction, A overset(k_(1))to B overset(k_(2))to overset(k_(3))toD What is the ratio of numbers of atoms of A to the number of atoms of B after long time interval starting with pure A, where k_(1) where K_(1) k_(1)=(In2)/(20xx60),k_(2)=(In2)/(30)?

Answer»

`(2)/(3)`
`10`
`20`
`40`

ANSWER :D
Discussion
17.

In the given sequence of reactions C is

Answer»




SOLUTION :COOH is a meta DIRECTING group
`R2`
Discussion
18.

In the extraction of iron, the slag produced is

Answer»

CO
`FesSiO_(3)`
`MgSiO_(3)`
`CaSiO_(3)`

ANSWER :D
Discussion
19.

In the given reaction,The main product will be: underset(H_(2)O //H^(oplus))overset(CH_(3)MgBr//Cu_(2)I_(2))(rarr)(Y)

Answer»




SOLUTION :
Discussion
20.

In the extraction of iron ……..is removed as slag.

Answer»

SOLUTION :CALCIUM SILICATE`(CaSiO_(3))`
Discussion
21.

In the extraction of iron in the blast furnace, the reducing agent for the ore is

Answer»

CARBON monoxide
Carbon dioxide
Carbon
Silica

Answer :1
Discussion
22.

In the given reaction [X] will be

Answer»

`Pt//O_2`
`Pd//O_2`
`X_2//NaOH`
JONES REAGENT

ANSWER :B
Discussion
23.

In the extraction of iron from hematite, select the incorrect statement

Answer»

MIDDLE zone of BLAST furnace is the reduction zone
Nature of GANGUE is acidic
`Fe_(2)O_(3)` is reduced by CO
Product from Blast furnace is "Pig iron".

Answer :A
Discussion
24.

In the extractionof gold,alluivalsandisconectratedbywhichmethod

Answer»

Gavityseparation
Frouthfloation
magneticseparation
Liquation

Answer :A
Discussion
25.

In the extraction of iron in the blast furnace, phosphorous separates as

Answer»

SLAG, `Ca_3(PO_4)_2`
Slag, `Mg_3(PO_4)_2`
VOLATILE, `P_2O_5`
`Ca_3P_2`

ANSWER :A
Discussion
26.

In the extraction of copper……….is removed as slag

Answer»

SOLUTION :FERROUS SILICATE `(FeSiO_(3))`
Discussion
27.

In the extraction of copper, the reaction which takes place in Bessemer converter is :

Answer»

`2Cu_2O + CUS to 6Cu + SO_2 uparrow`
`CuFeS_2 + O_2 to CuS + 2FES + SO_2 uparrow `
`2Cu_2S + 3O_2 to 2Cu_2 O + 2SO_2 uparrow `
`2FeS + 3O_2 to 2FeO + 2SO_2 `

ANSWER :A::C::D
Discussion
28.

In the given reactions : Glucose +3C_6H_5NHNH_2 overset(H^(o+)//Delta) Osazone + A+B (A) and (B) are :

Answer»

`C_6H_5NH_2 and NH_3`
`C_6H_5NH_2 and NH_2 OH`
`C_6 H_5NH-NHON and NH_3`
`NH_2 OH and HOH`

ANSWER :A
Discussion
29.

In the extraction of copper when molten copper is cooled slowly, blister copper is obtained due to evolution of the following gas

Answer»

WATER vapour
Sulphur dioxide
Carbon dioxide
Carbon monoxide

Answer :B
Discussion
30.

In the extraction of copper we use :

Answer»

`CuFeS_2`
`Cu_2S`
PYRITES
SILVER argentocyanide

Answer :A
Discussion
31.

In the given reaction 'X' will be

Answer»

`C_6H_5-CH_2OH`
`C_6H_5COOH`
`C_6H_5CONH_2`

ANSWER :D
Discussion
32.

In the extraction of copper, metal is formed in the Bessemer converter due to which of the following reaction?

Answer»

`Cu_2S + 2Cu_2O RARR 6Cu + SO_2`
`Cu_2S rarr 2CU + S`
`FE + Cu_2O rarr 2Cu +FEO`
`2Cu_2O rarr 4Cu + O_2`

ANSWER :A
Discussion
33.

In the given reaction [X] will be

Answer»

Zn/HCl
Sn/HCl
`LiAlH_4`
`HCH"O"//OVERSET(THETA)(OH)`

ANSWER :D
Discussion
34.

In the extraction of copper from sulphide ore the metal is formed by reduction of Cu_2O with

Answer»

`FeS`
`CO`
`Cu_2S`
`SO_2`

Solution :Iron has greater affinity for oxygen than COPPER.
`Cu_2O+ FeS to FEO + Cu_2S`
`FeO + SiO_2 to underset(("slag"))(FeSiO_3)`
`2Cu_2S + 3O_2 to 2Cu_2O + 2SO_2`
`2Cu_2O + Cu_2S underset("reduction")overset("auto")(RARR)6Cu + SO_2`
Discussion
35.

In the given reaction: [X] will be:

Answer»




SOLUTION :
Discussion
36.

In the extraction of copper , the metal formed in the Bessemer's converter is due to the reaction :

Answer»


ANSWER :D
Discussion
37.

In the extraction of copper from its sulphide ore, the metal is formed by the reduction of CuO with....

Answer»

`FeS`
`CO`
`Cu_2S`
`SO_2`

SOLUTION :Copper is obtained by auto REDUCTION (SELFREDUCTION)
`Cu_2O + 1/2 Cu_2S to 3Cu + 1/2 SO_2`
Discussion
38.

In the given reaction : [X] will be

Answer»




`CH_(3)-overset(O)overset(||)(C)-CH_(2)-COOH`

SOLUTION :
Discussion
39.

In the given reaction: [X] will be

Answer»




SOLUTION :
Discussion
40.

In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu_(2)O with

Answer»

FeS
CO
`Cu_(2)S`
`SO_(2)`

Solution :It is the correct ANSWER.
`2Cu_(2)O+Cu_(2)S to 6Cu+SO_(2)`
Discussion
41.

In the given reaction: [X] will be

Answer»

`HOOC-CH_(2)-CH_(2)-OVERSET(OH)overset(|)(CH)-CH_(3)`
`CH_(3)CH_(2)-CH_(2)-CH_(2)-COOH`
`HO-CH_(2)-CH_(2)-CH_(2)-COOH`
`CH_(3)-CH_(2)-UNDERSET(OH)underset(|)(C)H-CH_(2)-COOH`

Solution :
Discussion
42.

In the given reaction :'X' will be :

Answer»

LIALH4
NABH4
`H2/Ni/ DELTA `
Both (1) and (2)

Solution :H2/Ni/D reduce - CHO and multiple bond.
Discussion
43.

In the extraction of copper from its sulphide ore, the metal is formed by reduction of Cu^(2)O with

Answer»

FeS
CO
`Cu_(2)S`
`SO_(2)`

SOLUTION :`2Cu_(2)O+Cu_(2)Orarr6Cu+SO_(2)`
Discussion
44.

In the given reaction(X) will be :-

Answer»

C6H5–CHO

ANSWER :C
Discussion
45.

Intheextractionof copperfrom itssulphideore,themetalis formedbythereduction ofCu _2 Owith

Answer»

` FES `
CO
`Cu _ 2S `
` SO_ 2`

SOLUTION : `2 Cu _ 2 O+Cu _2 S to6 Cu + SO_2`
Discussion
46.

In the given reaction underset(573-673K)overset(Zn+Cr_(2)O_(3))(to) Product

Answer»

`CH_(3)OH`


ANSWER :A
Discussion
47.

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with :

Answer»

CARBON monoxide
copper (I) sulphide
sulphur dioxide
iron (II) sulphide

Solution :`2Cu_(2)O+Cu_(2)S to 6Cu+O_(2)`
Discussion
48.

In the given reaction, U_92^235overset(-alpha)to (A) overset(-beta)to(B) overset(-beta)to © isotope are :

Answer»

A and C
`U_92^235`
A and B
A, B and C

ANSWER :B
Discussion
49.

In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with

Answer»

IRON (II) sulphide
Carbon monoxide
Copper (I) sulphide
Sulphur dioxide

Answer :C
Discussion
50.

In the given reaction the products is : CH_(3)-CH_(2)-underset(O)underset(||)(C)-OCH_(3)+CH_(3)-underset(O)underset(||)(C)-OCH_(3) overset((1)CH_(3)O^(Theta)Na^(+))underset((2)CH_(3)OH)to oversert(H_(2)O)underset(Delta)to product

Answer»

`CH_(3)-CH_(2)-UNDERSET(O)underset(||)(C)-CH_2-underset(O)underset(||)(C)-OCH_(3)`
`CH_(3)-underset(O)underset(||)(C)-OVERSET(CH_(3))overset(|)(CH)-COOCH_(3)`
`H-underset(O)underset(||)(C)-CH_(2)-overset(CH_(3))overset(|)(C)H-COOCH_(3)`
`CH_(3)-underset(O)underset(||)(C)-CH_(2)-CH_(3)`

Solution :
Discussion