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 theextraction of copper fromitssulphideore,themetalisfinallyobtainedbythereduction of cuprousoxidewith

Answer»

carbonmonoxide
copper (I) SULPHIDE
SULPHURDIOXIDE
IRON (II) sulphide

Solution :Copper (I) sulphidereduces` Cu_2O `to metallic CU'
Discussion
2.

In the given reaction the total number of products obtained are …….

Answer»

ONE
TWO
THREE
FOUR

SOLUTION :
Discussion
3.

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

Answer»

Copper (I) SULPHIDE `(Cu_(2)S)`
SULPHUR dioxide `(SO_(2))`
IRON sulphide (FES)
Carbon MONOXIDE (CO)

Solution :Cuprous oxide formed during roasting of cuprous sulphide is mixed with few ammmt of cuprous sulphide and heated in a reverberatory furnace to get metallic copper.
`2Cu_(2)O+Cu_(2)S to 6Cu+SO_(2)`
Discussion
4.

ROH + HX to RX + H_(2)O In the above reaction , the reactivity of different alcohols is :

Answer»

PRIMARY `GT` SECONDARY `gt` TERTIARY
Tertiary `gt` Secondary `gt`Primary
Secondary `gt` Tertiary `gt`Primary
Secondary `gt` Primary `gt`Tertiary

Answer :B
Discussion
5.

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

Answer»

COPPER (I) SULPHIDE `(Cu_2S)`
SULPHUR dioxide `(SO_2)`
iron sulphide (FeS)
carbon monoxide (CO)

SOLUTION :It is can example of auto reduction :
`Cu_2S+2Cu_2O RARR 6Cu +SO_2`
Discussion
6.

In the given reaction, the product (Z) is ……. underset("Ethanol")(CH_(3)CH_(2)OH)overset(" Excess ")underset(Cl_(2))rarr overset(Ca(OH)_(2))rarr (Z)

Answer»

`C Cl_(3)CH=O`
`CHCl_(3)`
`C Cl_(4)`
`Cl_(3)C CH(OH)_(2)`

SOLUTION :`underset("Ethanol")(CH_(3)CH_(2)OH)overset(" Excess ")underset(Cl_(2))rarr underset("Chloroal")(Cl_(3)C CHO)overset(CA(OH)_(2))rarr underset("Chloroform")(CHCl_(3))`
Discussion
7.

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

Answer»

Cooper (I) sulphide `(Cu_(2)S)`
Sulphure DIOXIDE `(SO_(2))`
Iron sulphide `(FES)`s
Carbon monoxide(CO)

Solution :`2Cu_(2)O+Cu_(2)Sto 6Cu+SO_(2)(G)`
Discussion
8.

In the given reaction, the possible structure of compound (X) is (X) overset("conc." H_(2)SO_(4))(to)

Answer»




SOLUTION :
Discussion
9.

In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with ..........

Answer»

`CO`
`Cu_2O`
`Fe_2O_3`
`SO_2`

SOLUTION :`2Cu_2S + 3O_2 to 2Cu_2O + 2SO_2`
`2Cu_2O + Cu_2S to 6Cu + SO_2`
Discussion
10.

In the given reaction, the oxide of sodium is ........[{:(4Na+O_(2) rarr 2Na_(2)O),(Na_(2)O+H_(2)O rarr 2NaOH):}]

Answer»

Acidic
BASIC
Amphoteric
Neutral

Solution :`Na_(2)O` FORM NaOH. So that it is basic oxide.
Discussion
11.

In the given reaction , the number of isomeric products formed is - underset(("Racemic mixture"))(CH_3CHClCOOH)+underset(("Optically pure d-isomer"))(CH_3CHDOH)overset(H^(+))toEster

Answer»

1
2
3
4

Solution :
Discussion
12.

In the extraction of copper from copper pyrites, iron is removed as:

Answer»

`FeSO_4`
`FeSiO_3`
`Fe_3O_4`
`Fe_2O_3`

ANSWER :B
Discussion
13.

In the given reaction sequence, Y is

Answer»

PHENYL glyoxal
Glyoxal
Benzoic acid
Phenyl ethanal.

Solution :
Discussion
14.

In the extraction of copper,explain the smelting process.

Answer»

Solution :(i) In this method, a flux (a chemical substance that forms an easily fusible slag with gangue) and a reducing agent such as carbon, carbon monoxide (or) aluminium is added to the concentrated ore and the mixture is melted by heating at an elevated temperature (above the melting point of the metal) in smelting furnace.
(ii) For example the oxide of iron can be reduced by carbon monoxide as follows :
`Fe_(2)O_(3(s)) + 3CO_((g)) rarr 2Fe_((s)) + 3CO_(2(g)) UARR`
(iii) In this EXTRACTION, a basic flux, limestone (CaO) is used. Since the silica gangue present in the ore is acidic in nature, the limestone combines with it to form calcium silicate (slag).
`underset("Flux")(CaO_((s))) + underset("Gangue")(SiO_(2(s))) rarr underset("Slag")(CaSiO_(3(s)))`
(iv) In the extraction of copper from copper pyrites the concentrated ore is heated in a reverberatory furnace after mixing with silica, an acidic flux.
(v) The ferrous oxide formed due to melting is basic in nature and it combines with silica to form ferrous silicate (slag).
(vi) The remaining metal sulphides `Cu_(2)S` and FeS are mutually soluble and form a copper MATTE.
`2CuFeS_(2(s)) + O_(2(g)) rarr 2FeS_((l)) + Cu_(2)S_((l)) + SO_(2(g))`
`2FeS_((l)) + 3O_(2(g)) rarr 2FeO_((l)) + 2SO_(2(g))`
`underset("Flux")(FeO_((s))) + underset("Gangue")(SiO_(2(s))) rarr underset("Slag")(FeSiO_(3(s)))`
(vii) The matter is separated from the slag and fed to the converting furnace.
(VIII) During conversion, the FeS present in the matte is first oxidised to FeO.
(ix) This is removed by slag formation with silica.
(x) The remaining copper sulphide is further oxidised to its oxide which is subsequently converted to metallic copper.
`2Cu_(2)S_((l.s)) + 3O_(2(g)) rarr 2Cu_(2)O_((l.s)) + 2SO_(2(g))`
`2Cu_(2)O_((l)) + Cu_(2)S_((l)) rarr 6Cu_((l)) + SO_(2(g))`
(xi) The metallic copper is solidified and it has blistered appearance due to evolution of `SO_(2)` gas formed in this process. This copper is called blistered copper.
Discussion
15.

In the given reaction sequence Product (y) will be

Answer»




SOLUTION :
Discussion
16.

In the extraction of chlorine from brine .......

Answer»

`DeltaG^@` for the overall reaction is negative. 
`DeltaG^@` for the overall reaction is positive. 
`E^@` for overall reaction has negative value. 
`E^@` for overall reaction has positive value. 

Solution :`2CL^(-) + 2H_2O to 2OH^(-) + H_2 + Cl_(2) , DeltaG^(@) = +422kJ`
Using `DeltaG^@ = -nFE_("(cell)")^@`, we GET `E^@ = -2.2 V`.
Discussion
17.

In the extraction of chlorine by electrolysis of brine

Answer»

oxidation of `Cl^(-)` ION to chlorine gas occurs.
REDUCTION of `Cl^(-)` ion to chlorine gas occurs.
for overall reaction `DeltaG^(@)`has NEGATIVE value.
a displacement reaction TAKES place.

Solution :It is the correct answer. In general, an electrochemical process is feasible if `DeltaG^(@)` is negative.
Discussion
18.

In the given reaction sequence B is

Answer»




ANSWER :B
Discussion
19.

In the extraction of chlorine by electrolysis of brine......

Answer»

oxidation of` CI^(-)` ion to chlorine gas occurs.
reduction of `Cl^(-)`ion to chlorine gas occurs.
for overall reaction `DeltaG^(@)` has negative value.
a displacement reaction TAKES place.

SOLUTION :oxidation of `Cl^(-)` ion to chlorine gas occurs. The chlorine is EXTRACTED from brine based on oxidation reaction. The FREE energy change of the reaction is +422 kJ. The Eo value is -2.2 V.
Discussion
20.

In the given reaction R-overset(O)overset("||")C-OHoverset((X))rarrR-overset(O)overset("||")C-O-CH_(3) (X) will be:

Answer»

`CH_(2)N_(2)`
`CH_(3)OH//H^(oplus)`
`MeCOOH`
`Me_(2)SO_(4)`

Answer :A::B::D
Discussion
21.

Intheextractionofchlorinefrombrine........... .

Answer»

` DELTAG ^(@)`for the overallreactionisnegative
` Delta G^(@)`for theoverallreactionispositive
` E^(@) ` foroverallreactionhas negativevalue
` E^(@) `foroverallreactionhaspositivevalue

Solution : In extractionofelementsbyelectrolysis,` DeltaG ^(@) `oftheoverallreactionis positivewhile ` E^(@) `oftheoverallreactionisnegative, i.e.,options (b) and(C )are correct.
Discussion
22.

In the extraction of aluminium , the function of cryolite is to:

Answer»

LOWER the MELTING POINT of alumia
Increase the melting point of alumina
Remove IMPURITIES from alumina
Minimise the ANODIC effect

Answer :A
Discussion
23.

In the given reaction sequence: (B) will be:

Answer»




SOLUTION :
Discussion
24.

In the given reaction RCN underset((ii)H_2O //H^+)overset((i)RMgX)rarr(X), (X) will be

Answer»

Aldehyde
Ketone
Tertiary alcohol
Secondary alcohol

Answer :B
Discussion
25.

In the extraction of aluminium metal , one of the process is summarised as follows : Which of the following entrie correctly summarises reagents , electrodes & products of the process ?

Answer»

`{:( I , II , III , IV , V) , ((a) NaOH , [Al(OH)_(4)] , HF , Na_(3)AlF_(6) , "Cathode"):}`
`{:(, I , II , III , IV , V) , ((B), NaOH , NaAlO_(2) , CO_(2) , CO_(2) , "Anode"):}`
`{:(, I , II , III , IV , V) , ((c), H_(2)SO_(4) , Al_(2)(SO_(4))_(3) ,NH_(3) , Na_(3)AlF_(6) , "Cathode"):}`
`{:(, I , II , III , IV , V) , ((d), NaOH , NaAlO_(2) ,CO_(2), Na_(3)AlF_(6) , "Cathode"):}`

Answer :a,b,d
Discussion
26.

In the extraction of aluminium the electrolyte is

Answer»

Fused cryolite with FELDSPAR
Fused cryolite with fluorspar
Pure ALUMINA in MOLTEN cryolite
Pure alumina with BAUXITE and molten cryolite

Answer :C
Discussion
27.

In the extraction of aluminium metal, one of the process is summarised as follows :

Answer»

`{:(" "I,II,III," "IV," "V),(NaOH,Al^(3+),HF,Na_(3)AlF_(6),"Cathode"):}`
`{:(" "I,II,III," "IV," "V),(NaOH,NaAlO_(2),CO_(2),NaF,"Anode"):}`
`{:(" "I,II,III," "IV," "V),(H_(2)SO_(4),Al_(2)(SO_(4))_(3),NH_(3),Na_(3)AlF_(6),"Cathode"):}`
`{:(" "I,II,III," "IV," "V),(NaOH,NaAlO_(2),CO_(2),Na_(3)AlF_(6),"Cathode"):}`

Answer :D
Discussion
28.

In the extraction of aluminium from alumina by electrolysis, cryolite is added to

Answer»

LOWER the MELTING point of alumina
Remove impurities from alumina
Decrease the ELECTRICAL conductivity
Increase the RATE of reduction

Answer :A
Discussion
29.

In the extraction of aluminium by Hall-Heroult process, purified Al_(2)O_(3) is mixed with CaF_(2) to

Answer»

lower the MELTING point of `Al_(2)O_(3)`
increase the CONDUCTIVITY of MOLTEN mixture.
reduce `AL^(3+)` (aq) into Al (s).
act as catalyst.

Solution :are both correct options.
Discussion
30.

In the extraction of aluminium by Hall-Heroult process, purified Al_2O_3 is mixed with CaF_2 to...

Answer»

Lower the MELTING point of `Al_2O_3`.
Increase the conductivity of molten mixture.
Reduce `AL^(3+)` into` Al_((s))`
ACTS as catalyst.

Solution :`CaF_2` depresses the melting point of ALUMINA and INCREASES electrical conductivity.
Discussion
31.

In theextractionofaluminiumbyHall -Heroultprocess,purifiedAl _2 O _ 3ismixedwithCaF _ 2to

Answer»

lower themelting point of` Al _2 O_ 3 `
increase THECONDUCTIVITY ofmoltenmixture
REDUCE` Al^( 3+) `intoAl
actsascatalyst

ANSWER :A::B
Discussion
32.

In the extraction of Aluminium by electrolysis overall cell reaction

Answer»

SOLUTION :`2Al_2O_3+3Cto4Al+3CO_2`
Discussion
33.

In the given reaction : Product (B) is :

Answer»




ANSWER :D
Discussion
34.

In the extraction of Aluminium by electrolysis Role of cryolite

Answer»

SOLUTION :INCREASE ELECTRICAL CONDUCTIVITY of BONDS
Discussion
35.

In the given reaction, product, A formed is (AAK_MCP_37_NEET_CHE_E37_027_Q01)

Answer»

Laevorotatory
Racemic nixture
Meso compound
Dextrorotatory

Answer :B
Discussion
36.

In the given reaction Product (P) will be

Answer»




SOLUTION :
Discussion
37.

In the given reaction: P_4 + NaOH + H_2O rarr PH_3 + NaH_2PO_2

Answer»

<P>P is REDUCED only
P undergoes DISPROPORTIONATION reaction
P is oxidised only
O is reduced

Answer :B
Discussion
38.

In the extraction of Aluminium by electrolysis Give the composition of electolyte used

Answer»

SOLUTION :MOLTEN `Al_2O_3+Na_3AlF_6//CaF_2`
Discussion
39.

IntheextractionofAl,impurealuminaisdissolvedin conc. NaOH toformsodiumtoformsodiumaluminateandleavingimpuritiesbehind. Whatis the name of thisprocess ?

Answer»

Solution : ` UNDERSET ("Alumina")(Al_2O_3) +underset ("(conc.)")(2NaOH) +3 H_2Oto underset ("Sod.Metaluminate") (2Na[AL(OH)_4] `
Thisprocessiscalledleaching.
Discussion
40.

In the given reaction maximum yield is obtained when (X) is: C_(6)H_(5)COOC_(2)H_(5)+(X)underset((ii)H^(+))overset((i)C_(2)H_(5)Ona)tobeta-ketoester

Answer»

`CH_(3)-underset(CH_(3))underset(|)"CH"-COOC_(2)H_(5)`
`CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overdet(|)C-COOC_(2)H_(5)`
`C_(6)H_(5)-underset(CH_(3))underset(|)"CH"-COOC_(2)H_(5)`
`CH_(3)COOC_(2)H_(5)`

Answer :D
Discussion
41.

In the extraction of Al, impure Al_(2)O_(3) is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?

Answer»

Solution :This is called leaching. `Al_(2)O_(3)` dissolves in conc. NAOH to form sodium aluminate. It is FILTERED to remove impurities.
Discussion
42.

In the given reaction P will be:

Answer»




ANSWER :B
Discussion
43.

In the given reaction N_(2)+O_(2)hArr 2NO, equilbrium means that

Answer»

CONCENTRATION of reactants is CHANGING where as concentration of PRODUCTS is CONSTANT
Concentration of all substances is contant
Concentration of reactants is constant where as concentration of prodcts is changing
Concentaration of all substances is changing

Answer :B
Discussion
44.

In the extraction of Aluminimum by electrolysis. i. Give the composition of electrolyte used ii. Overall cell reaction iii. Role of cryolite

Answer»

SOLUTION :i. `"Molten "Al_(2)O_(3)+Na_(3)AlF_(6)|CaF_(2)`
ii. `2Al_(2)O_(3)+3C RARR 4Al+3CO_(2)`
iii. To DECREASE melting point of alumina.
Discussion
45.

In the given reaction how many products are expected. undersetDeltaoverset(CH_3OH)to

Answer»


SOLUTION :
Discussion
46.

In the extraction of Ag and Au using a KCN solution, cyanide ions react with metal ions. Metal acts as

Answer»

An oxidizingagent
A lewis acid
A REDUCING agent
A COMPLEXING agent

Answer :C::D
Discussion
47.

In the given reaction, FeC_(2) O_(4) + KMnO_(4) overset( H^(+))(rarr) Fe^(3+) + CO_(2) + Mn^(2+), if the equivalents of Fe^(3+) are 'a', then equivalent of FeC_(2) O_(4) will be

Answer»

a
2a
3a
none of these

Answer :C
Discussion
48.

In the given reaction Identify I and II for the above reaction and choose the correct option.

Answer»




SOLUTION :CARBOXYLIC acids REACT with AMMONIA to GIVE ammonium salt, which on further heating at high temperature give amides.
Discussion
49.

In the explosive amatol, TNT is mixed with

Answer»

AMMONIUM citrate
Ammonium nitrate
Ammonium oxalate
Ammonium sulphate

Answer :B
Discussion
50.

In the given reaction CH_(3)-underset(OT)underset(|)(CH)-CH_(2)-CH_(2) -underset(OTs)underset(|)(CH)-CH_(3)underset((ii)"KOH")overset((i)overset(Ө)(S)H("one equivalent"))rarr[X] Will be :

Answer»

`CH_(3)-overset(OTS)overset(|)(CH)-CH_(2)-CH_(2)-oversetoverset(Ө)(S)overset(|)(CH)-CH_(3)`
`CH_(3)-oversetoverset(Ө)(S)overset(|)(CH)-CH_(2)-CH_(2)-oversetoverset(Ө)(S)overset(|)(CH)-CH_(3)`

ANSWER :C
Discussion