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.

Statement-I: If decimolal solution of sodium chloride boils at 101.2^(@)C, then decimolal solution of calcium chloride will also boil at the same temperature. Because Statement-II: For same molal concentration of aqueous solutions of electrolytes, the elevation of boiling point may not be same.

Answer»


ANSWER :D
Discussion
2.

Statement I : Hard water does not give lather with soap . Statement II : Calcium and magnesium salts present in hard water form precipitate with soap .

Answer»

Both the statements individually true and Statement II is the correct explanation of Statement I.
Both the statements are individually true but Statement II is not correct explanation of Statement I.
Statement I is true but Statement II is false .
Statement I is false but Statement II is true .

SOLUTION :When hard water is beated with soap solution , `Ca^(++)` and `Mg^(++)` ions present in hard water react with anions of fatty acids present in SOAPS to form SCUM or precipitate . As a RESULT , hard water does not PRODUCE lather with soap .
Discussion
3.

Statement-I: Glucose gives a reddish-brown precipitate with Fehiling's solution because Statement-2: Reaction of glucose with Fehling's solution gives CuO and gluconic acid

Answer»

Statement-I is TRUE, Statement-II is True : Statement-II is a CORRECT EXPLANATION for Statement-I
Statement-I is True, Statement-II is True : Statement-II is `NOT` a correct explanation for Statement-I
Statement-I is True, Statement-II is FALSE.
Statement-I is False, Statement-II is True.

Answer :C::D
Discussion
4.

Statement -I : Glass is not considered as a true compound Statement -II : Glass does not have a difinite melting point

Answer»

Both the statements are individually TRUE and statement II is the correct EXPLANATION of statement I
Both the statements are individually true but statement II is not correct explanation of statement I
Statement I is true but statement II is false
Statement I is false but statement II is true

ANSWER :B
Discussion
5.

Statement-I: Fuan is more soluble than DHF Dihydrofuran, in H_(2)O Statement-II: Greater e^(-) density on the O atom, stronger is the H-bonding and more soluble is the ether.

Answer»

If both statement-I & statement-II are TRUE & the statement-II is a CORRECT EXPLANATION of the statement-I
if both statement-I & statement-II are true but statement-II is not a correct explanation of the statement-I
If statement-I is true but the statement-II is FALSE.
If statement-I is false but the statement-II is true.

Answer :D
Discussion
6.

Statement-I: Ethers o reaction with air and light form hydroperoxides. These peroxides decompose vilently at high temperature. Allyln-n-propyl ether with O_(2) in lgiht gives mainly l-hydroperoxide allyl-n-propyl ether Statement-II: The reaction proceeds via the formation of radical anion.

Answer»

If both statement-I & statement-II are TRUE & the statement-II is a CORRECT EXPLANATION of the statement-I
if both statement-I & statement-II are true but statement-II is not a correct explanation of the statement-I
If statement-I is true but the statement-II is false.
If statement-I is false but the statement-II is true.

Answer :C
Discussion
7.

Statement - I. For isotonic solutions C_1 = C_2 Statement - II. For isotonic solutions pi_1 = pi_2

Answer»

Statement-1 is TRUE, statement-2 is true and statement-2 is CORRECT EXPLANATION for statement-1.
Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.
Statement-1 is true, statement-2 is FALSE.
Statement-1 is false, statement-2 is true.

Answer :D
Discussion
8.

Statement-I : Elements of oxygen family are not capable of forming p pi-p pi bonds with other elements of smaller size like C, N ets Statement-II : Only oxygen prossess this property of show multiple bonding

Answer»

Statement-I and Statement-II are CORRECT and Statement-II is correct EXPLANATION of Statement-I
Statement-I and Statement-II are correct and Statement-II is not correct explanation of Statement-I
Statement-I is correct and Statement-II is not correct
Statement-I is not correct and Statement-II is correct

Answer :B
Discussion
9.

Statement -I : does not give bromamide reaction. Statement-II : secondary amides does not give bromamide reaction.

Answer»

If both Statement-I & Satement-II are TRUE&the Statement-II is not a correct EXPLANATION of the Statement-I.
If both Statement-I & Statement-II are True but Statement-II is not a correct explanation of the Statement-II
If Statement-I is True but the Statement-II is False.
IfStatement-I is False but the Statement-II is True.

SOLUTION : GIVE bromamide REACTION.
Discussion
10.

Statement-I: Diphynyl ether (I) on dinitration gives the

Answer»

If both statement-I & statement-II are TRUE & the statement-II is a CORRECT EXPLANATION of the statement-I
if both statement-I & statement-II are true but statement-II is not a correct explanation of the statement-I
If statement-I is true but the statement-II is FALSE.
If statement-I is false but the statement-II is true.

Answer :D
Discussion
11.

Statement I : Colour of nitrogen dioxide changes to colourless at low temperature Statement II : At low temperature Nitrogen tetroxide (N_(2)O_(4)) is formed which is colourless.

Answer»

Both the statements individually true and Statement II is the CORRECT explanation of Statement I.
Both the statements are individually true but Statement II is not correct explanation of Statement I.
Statement I is true but Statement II is false .
Statement I is false but Statement II is true .

Solution :`NO_(2)` EXISTS in EQUILIBRIUM with the COLOURLESS gas DINITROGEN tetroxide
`(N_(2)O_(4))` . At higher temperature of `NO_(2)` is favoured while at low temperature `N_(2)O_(4)` predominates.
Discussion
12.

Statement-I : Chlorination of ethyl benzene with Cl_(2) in prescence of heat and light nearly yield 1-yield 1-chloro-1-phenyl ethane as major product. Because Statement-II : The reaction oC Curs through intermediate formation of the radical C_(6)H_(5)CH-CH_(3).

Answer»


Statement-I is TRUE, Statement-II is True : Statement-II is `NOT` a CORRECT EXPLANATION for Statement-I
Statement-I is True, Statement-II is FALSE.
Statement-I is False, Statement-II is True.

Solution :N//A
Discussion
13.

Statement -I :Cryolite is used in electrolytic extraction of Al from alumuna.Statement -2: It dissilves alumina

Answer»


ANSWER :a
Discussion
14.

Statement-I : C_(6)H_(5) is a meta-directing group. Because Statement-II : -C_(2)H_(5) is a + l group.

Answer»

Statement-I is TRUE, Statement-II is True : Statement-II is a CORRECT EXPLANATION for Statement-I
Statement-I is True, Statement-II is True : Statement-II is `NOT` a correct explanation for Statement-I
Statement-I is True, Statement-II is FALSE.
Statement-I is False, Statement-II is True.

Solution :N//A
Discussion
15.

Statement-I : Buta-1,3-diene is less stable than Penta-1,4-do,eme, ltbr. Because Statement-II : Buta-1,3-diene has greater number of reasonating structures and delocallsed electron cloud.

Answer»


SOLUTION :N//A
Discussion
16.

Statement - I. Benzene-toluene mixture forms ideal solution. Statement - II. Components with structural similarity forms ideal solution in general.

Answer»

Statement-1 is TRUE, statement-2 is true and statement-2 is CORRECT EXPLANATION for statement-1.
Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.
Statement-1 is true, statement-2 is FALSE.
Statement-1 is false, statement-2 is true.

Answer :A
Discussion
17.

Statement I : At high temperature , hydrogen can reduce PbO to elemental lead. Statement II : Hydrogen has great affinity to oxygen.

Answer»

Both the statements individually true and STATEMENT II is the correct explanation of Statement I.
Both the statements are individually true but Statement II is not correct explanation of Statement I.
Statement I is true but Statement II is false .
Statement I is false but Statement II is true .

Solution :It is due to reduction reaction hydrogen reduces the oxygen to LEAD OXIDE to ELEMENTAL lead.
Discussion
18.

Statement-I: At any level of temperature (-6^(@)C "to" 300^(@)C) the elevation or depression can be measured by adjusting the Hg level in the bulb of Beckman's thermometer unlike in convention thermometer . Statement-II: In Cottrell's method, pumping device which resembles an inverted funnel is used to reduce superheating during boiling . (III): Rast's method is generally used for Solid solution (solute-solid, solvent-solid) Statement-IV: In Berckeley-Hartley method, copper ferrocynaide is precipitated in the pores Correct statement is /are:

Answer»

only I, II
only I,III
only I,II, III
all

Answer :D
Discussion
19.

Statement-I : Antiseptic are not injected into the body. Statement-II : Antiseptic are intravenous drugs

Answer»

Both I and II are TRUE
both I and II are FALSE
I is true , but II is false
I is false but II is true

ANSWER :C
Discussion
20.

Statement-I : Alkyness are more reactive than alkenes towards electrophilic reagents like H^(+). Because Statement-II : The alkyl carbocation formed from alkene is more stable than the uinyl carbocation formed from alkyne.

Answer»


SOLUTION :N//A
Discussion
21.

Statement-I : Addition of Br_(2^(-)) water containing dissolved NaCl to ethylene gives a mixture of 1, 2- dibromoethane, 1-bromo-2-chloroethane and 2-bromoethanol. Because Statement-II : Addition oC Curs through a carbocation intermediate.

Answer»


SOLUTION :N//A
Discussion
22.

Statement I :After cutting an apple or a banana the colour of the cut surface becomes brown Statement II : Polyphenolic compunds present in fruits get oxidized in air and show colour

Answer»

Both the statements are individually TRUE and statement II is the CORRECT EXPLANATION of statement I
Both the statements are individually true but statemnts II is not corrrect exp[anation of statemnt I
statement I is true but statement II is false
statement I is false but statement II is true

Solution :Both the statement are truethe chemical reaction can be expressed as:
`Ca(s)+H_(2)SO_(4)(AQ)rarrCaSO_(4)+H_(2)`
Discussion
23.

Statement - I : Aldehydes restore the megenta colour of schiff's base Statement - II : Schiff's reagent is a colourless P - rosaniline hydrochloride

Answer»

I is TRUE II is WRONG
I is wrong II is true
Both STATEMENTS are CORRECT
Both statements are INCORRECT

Answer :C
Discussion
24.

Statement-I: Acyl halide are more reactive than acid substance amide towards nucleophilic substitution. Because Statement-II: X^(-) are better leaving group than NH_(2).

Answer»

Statement-I is TRUE, Statement-II is True : Statement-II is a CORRECT EXPLANATION for Statement-I
Statement-I is True, Statement-II is True : Statement-II is `NOT` a correct explanation for Statement-I
Statement-I is True, Statement-II is FALSE.
Statement-I is False, Statement-II is True.

Answer :A
Discussion
25.

Statement I: Acetic acid does not undergo haloform reaction. Statement II: Acetic acid has no alpha hydrogen.

Answer»

a.STATEMENT I and Statement II are true and Statement II is the correct explanation of Statement I.
b.Statement I and Statement II are true and Statement II is not the correct explanation of Statement I.
c.Statement I is true and statement II is false.
d.Statement I is false and statement II is false

Solution :Haloform reaction is given only by aldehydes (containing `(CH_(3)-CHO)` group), ketones (containing `(Me-CO-)` group), and ALCOHOLS (containing `(CH_(3)-CH(OH)-)` group), not by acids. So acetic acid does not give haloform reaction.
In acetic acid `(underset(alpha)(C )H_(3)-COOH)`, `alpha`-hydrogen atoms are present. Hence, statement `I` is correct but statement `II` is incorrect. So the answer is `(c ).
Discussion
26.

Statement - I: A very dilute acidic solution of Cd^(2+) and Ni^(2+) givesyellowprecipitate of CuS on passing H_(2)S Statement - II : The solubility productof CdS is morethan that of NiS

Answer»

Statement - I is true ,Statement - II is also true , Statement - II is the correct explatationfor Statement - I
Statement - I is true ,Statement - II is true , Statement - II is the correct explatationfor Statement - I
Statement - I is true ,Statement - II is FALSE
Statement - I is false ,Statement - II is true

Solution :In qualitativeanalysis of basicradicalls cation `CD^(2+)` belongs to GROUP II `Ni^(2+)` Belongsto group IV group II radicals areprecipitate bypasssing`H_(2)S` in acidicsolution .They have low value of solubilityproducts .But that of group IV areprecipitate bypassing `H_(2)S` in alkline solution and have highvalue of solubilityproducts
Therefore on passing `H_(2)S` in acidic solution a yellow precipirtate of CuS is formed
Discussion
27.

Statement-I: 1M solution of Glauber's salt is isotonic with 1M solution of KNO_(3). Because Statement-II: Solutions having same molar concentration fo solute may or may not have same osmotic pressure.

Answer»


ANSWER :D
Discussion
28.

Statement: Fluresence is the emission of light by sucstances after absorbing light. Explanation: It may continue for appreciable time after the exciting light is switched off.

Answer»

(a) `S` is correct but `E` is WRONG
(b) `S` is wrong but `E` is correct
(C ) Both `S` and `E` are correct and `E` is correct explanation of `S`
(d) Both `S` and `E` are correct but `E` is not correct explanation of `S`.

SOLUTION :It is a FACT
Discussion
29.

Statement (A) : Zinc will free Cu metal from copper sulphate solution. Reason (R) : At 288 K temperature, E_(Zn^(2+)|Zn)^(@)=-0.76 volt and E_(Cu^(2+)|Cu)^(@)=0.34 Volt

Answer»

Both STATEMENT and reasons are true. And REASON is correct explanation of statement.
Both statement and reasons are true, but reason is not the correct explanation of statement.
But reason is not correct explanation of statement. (Statement is true but reason is false).
Statement si false but reason is true.

Solution :`Zn_((S))+Cu_((aq))^(2+) to Zn_((aq))^(2+)+Cu_((S))`
`E_(Cu^(2+)|Cu)^(@)=0.34V,E_(Zn^(2+)|Zn)^(@)=-0.76V`
From the above VALUE it can be shown that zinc liberated ELECTRON and reduction of copper occur.
Discussion
30.

Statement: According transition state theory for the formation of an activated complex, one of the vibrational degree of freedom is converted into a transitional degree of freedom. Explanation: Energy of the the activated complex is higher than the energy of reactant molecules.

Answer»

(a) `S` is CORRECT but `E` is wrong
(B) `S` is wrong but `E` is correct
(C ) Both `S` and `E` are correct and `E` is correct EXPLANATION of `S`
(d) Both `S` and `E` are correct but `E` is not correct explanation of `S`.

Solution :Explanation is correct reason for statement.
Discussion
31.

Statement (A): Determination of cathode and anode is done with the help of thermometer. Reason (R) : High and less value of reduction potential is strong reducing agent.

Answer»

Both statement and REASONS are true. And REASON is CORRECT explanation of statement.
Both statement and reasons are true, but reason is not the correct explanation of statement.
But reason is not correct explanation of statement. (Statement is true but reason is false).
Statement SI false but reason is true.

Solution :Statement si false but reason is true.
Discussion
32.

Statement (A) : Corrosion of galvanized iron is not possible. Reason (R) : Electrode potential of zinc is more negative than of iron.

Answer»

Both statement and reasons are true. And REASON is correct explanation of statement.
Both statement and reasons are true, but reason is not the correct explanation of statement.
But reason is not correct explanation of statement. (Statement is true but reason is false).
Statement si false but reason is true.

Solution :Electrode potential of ZINC is more negative than iron. So it liberates electrons more easily than iron. So its corrosion OCCUR first. Hence, corrosion of iron STARTS only after complete oxidation of zinc.
Discussion
33.

Statement “Ozone in atmosphere is decreased by emission of chloro-fluoro-carbons like "CCl"_(2)F_(2) ”

Answer»

Is true
Is FALSE
Only in presence of `CO_(2)`
Only in ABSENCE of `CO_(2)`

ANSWER :A
Discussion
34.

Statement-2: The 'spin only' magnetic moment of green complex, potassium amminetetracyanidonitrosonium chromate(I) is 1.73 BM. Statement-2: To have two d-orbital empty for d^(2)sp^(3) hybridization, the pairing of electrons take place having behind one unpaired electron as CN^(-) is a stronger field ligand.

Answer»

Statement-1 is TRUE, Statement-2 is True , Statement-2 is a CORRECT explanation for Statement-1.
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.
Statement-1 is True, Statement-2 is FALSE.
Statement-1 is False, Statement-2 is True.

Solution :`K_(2)[overset(+1)(Cr)(NH_(3))pverset(-4)((CN)_(4)) overset(+)(NO)]`
Discussion
35.

Statement-2: Hund's rule violates in [Co(CN)_(6)]^(3-) complex ion. Statement-2: Degeneracy of d orbitals is lost under any field ligand.

Answer»

Statement-1 is TRUE, Statement-2 is True , Statement-2 is a CORRECT EXPLANATION for Statement-1.
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.
Statement-1 is True, Statement-2 is FALSE.
Statement-1 is False, Statement-2 is True.

Answer :D
Discussion
36.

Statement-2: All pseudohalide ions are not stronger coordinating ligands than the halide ion and hence the complex formed by pseudohalide ions are of high spin. Statement-2: The halide ions have higher values of electronegativity in their corresponding periods.

Answer»

Statement-1 is True, Statement-2 is True , Statement-2 is a CORRECT explanation for Statement-1.
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.
Statement-1 is True, Statement-2 is FALSE.
Statement-1 is False, Statement-2 is True.

Solution :PSEUDOHALIDE donors LIKE `CN^(-)` are strong field LIGANDS.
Discussion
37.

Statement-1:When PhCHO is made to react in OD^(Theta)//D_2O no D is incorporated into the CH_2 ol PhCH_2OH, PhCOO^(-) mixture during Cannizaro's reaction. Statement-2:Intermolecular H^(Theta) transfer takes place in the rate determining step, with out getting free in solution.

Answer»

Statement-1 is True, Statement-2 is True, Statement-2 is a correct EXPLANATION for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is FALSE.
Statement-1 is False, Statement-2 is True.

Solution :Cannizzaro REACTION is INTRAMOLECULAR
Discussion
38.

Statement-1:White crystalline precipitate of silver sulphite dissolves if sulphite ions are added in excess. Statement-2:Sulphite ions decolourise the pink colour of acidified KMnO_4

Answer»

Statement-1 is TRUE, Statement-2 is True, Statement-2 is a correct explanation for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is FALSE.
Statement-1 is False, Statement-2 is True.

Solution :Statement-1:`Ag_2SO_3 darr + SO_3^(2-)to 2[Ag(SO_3)]^(-)`(SOLUBLE complex)
Statement-2:`5SO_3^(2-)+2MnO_4^(-)`(pink)+`6H^(+)to 2Mn^(2+)`(colourless)+`5SO_4^(2-)+3H_2O`
Discussion
39.

Statement-1:White precipitate of zinc phosphate is soluble in water. Statement-2:Zinc phosphate forms a soluble complex with ammonia.

Answer»

Statement-1 is TRUE, Statement-2 is True, Statement-2 is a correct explanation for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is False.
Statement-1 is False, Statement-2 is True.

Solution :`Zn_3(PO_4)_2+12 NH_3 to 3 [Zn(NH_3)_4]^(2+)+2 PO_4^(3-)`
Discussion
40.

Statement-1:Wrought iron is prpared by pudding process Statement-2:Pig iron is the purest form of iron

Answer»

Statement -1 is true, Statement-2 are true and Statement-2 is the CORRECT EXPLANATION of Statement -1
Statement -1 is true, Statement-2 are true and Statement-2 is not a correct explanation of Statement -1
Statement-1 is true but Statement -2 is false
Statement-1 is false but Statement -2 is true

Answer :c
Discussion
41.

Statement-1:When 3-Chlorobut-1-ene react H_2O then give four products. Statement-2:Intermediate is carbocation and it show resonance and recemisation.

Answer»

Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is FALSE.
Statement-1 is False, Statement-2 is True.

Solution :
Discussion
42.

Statement-1:The order of base catalysed hydrolysis of ester is : (i)CH_3-COOCH_3gtCH_3g-COOC_2H_5gtCH_3-COOCH(CH_3)_2 Statement-2:S_N2 Th is sterically as well as electronically controlled reaction.

Answer»

Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is FALSE.
Statement-1 is False, Statement-2 is True.

Solution :NA
Discussion
43.

Statement-1:The preparation of G.R. occurs in solution phase. Statement-2: The reaction will be explosive in solid phase. G.R. is stable only in solution phase.

Answer»

Statement-1 is True, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is False.
Statement-1 is False, Statement-2 is True.

Solution :The REACTION will be explosive is solid phase. G.R. is STABLE only in solution phase.
Discussion
44.

Statement-1:When 1 mole of benzaldehyde and 1 mole of cyclohexanone is treated with 1 mol of semicarbazide cyclohexanone semicarbazone precipitates first and finally precipitate of semicarbazone of benzaldehyde is formed Statement-2:First one is Kinetically controlled product and later one is thermodynamically controlled product.

Answer»

Statement-1 is TRUE, Statement-2 is True, Statement-2 is a correct EXPLANATION for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is False.
Statement-1 is False, Statement-2 is True.

Solution :CYCLOHEXANONE is more reactive than BENZALDEHYDE
Discussion
45.

Statement 1:Teflon has high thermal stability and chemical inertness. Statement 2:It has strong (C-F)bonds.

Answer»

Statement `1` is TRUE ,statement `2`is true,statement`2`is the CORRECT EXPLANATION of statement`1`
Statement `1` is true ,statement `2`is true,statement`2`is not the correct explanation of statement`1`
Statement `1` is true ,statement `2`is FALSE
Statement `1` is false,statement `2`is true

Solution :Both STATEMENTS are correct,and statement `2`is the correct explanation of statement `1`.
Discussion
46.

Statement-1:Sulphur dioxide is a more powerful reducing agent in alkaline medium than in acidic medium. Statement-2:Sulphur dioxides reacts with hydrogen sulphide in presence of moisture and sulphur is precipitated.

Answer»

Statement-1 and statement-2 are correct andstatement-2 is the correct explanation for Statement-1
Statement-1 is True, Statement-2 are correct but statement-2 is NOT a correct explanation for Statement-1
Statement-1 is correct, but statement-2 is False.
Statement-1 is False, but Statement-2 is correct.

Solution :`S_1:2H_2O+SO_2 hArr SO_4^(2-)+4H^(+)+2E^(-)`(increase in `[H^+]` will shift the equilibrium in BACKWARD direction )
`SO_2 +4OH^(-)hArr SO_4^(2-)+2H_2O+2e^(-)`(increase in `[OH^-]` will shift the equilibrium in forward direction )
`S_2:2H_2S+SO_2 overset("moisture")to2H_2O +3S darr`
Discussion
47.

Statement-1:Specific conductance decreases with dilution whereas equivalent conductance increases. Statement-2:On dilution number of ions per millilitre decreases but total number of ions increases consideably.

Answer»

Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT explanation for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-2
Statement-1 is True, Statement-2 is False.
Statement-1 is False, Statement-2 is True.

Solution :TOTAL number of ions will increase SLIGHTLY on dilution (Not considerably)
Discussion
48.

Statement-1:Sodium chloride is added during electrolysis of fused anhydrous magnesium chloride. Statement-2:Anhydrous magnesium chloride is obtained by heating hydrated magnesium chloride, MgCl_2. 6H_2O

Answer»

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is False.
Statement-1 is False, Statement-2 is True.

Solution :S-1:It lowers the fusion TEMPERATURE of `MgCl_2` and provide CONDUCTIVITY to the ELECROLYTE.
S-2: `MgCl_2. 6H_2O` is calcined in a stream of dry HCL gas to have anhydrous `MgCl_2` . In absence of dry HCl. It forms `Mg_2OCl_2 (MgO. MgCl_2)` because of HYDROLYSIS .
Discussion
49.

Statement-1:Silica is added as a flux in reverberatory furnace, in the extraction of copper from copper pyrites. Statement-2:Silica acts as basic flux.

Answer»

Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT explanation for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is False.
Statement-1 is False, Statement-2 is True.

Solution :`S_1:2CuFeS_2+O_2toCu_2S+2FeS+SO_2`,
`2FeS+3O_2 to 2FeO +2SO_2`
`FeO+SiO_2 to FeSiO_3`, thus remove the basic impurity of IRON oxide.
`S_2`:Silica acts as an ACIDIC FLUX.
Discussion
50.

Statement-1:Reduction of But-2-yne of Na/liq. NH_5 gives trans-But-2-ene. Statement-2: It is an example of 'anti' addition.

Answer»

Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is FALSE.
Statement-1 is False, Statement-2 is True.

Answer :A
Discussion