94420 + Interview Questions in Chemistry in Class 12

1.	In the galvanizing process, iron is coated with zinc. The resulting chemical protection is most similar to that provided when:
Answer» a magnesium BAR is connected to an iron pipe an iron can is plated with tin COPPER PIPES are connected using lead solder a copper pipe is COVERED with EPOXY paint. Answer :A

Discussion

2.	In the gaseous equilibrium H_(2)X_(2) + heat hArr 2HX, the formation of HX will be favoured by
Answer» High pressure and low temperaturee High temperatuer and low pressure Low temperatue and low pressure High temperatue and high pressure Solution :`H_(2)X_(2)+heathArr2HX.` Reactin is eneothermic and VOLUME INCREASING in forward direction so according to LE chatelier's PRINCIPLE for formation of HX, temperature of the reaction should be high and pressure should be low.

Discussion

3.	In the equation : Rate =PZ_(AB)e^(-Ea//RT), what does P represent ?
Answer» SOLUTION :PROBABILITY FACTOR.

Discussion

4.	In the frouth floatation process, zinc sulphide and lead sulphide can be separated by
Answer» using collectors. adjusting the PROPORTION of oil to water. using depressant. using froth stabilisers. Solution :are both CORRECT OPTIONS.

Discussion

5.	In the equation PV RT, the value of R will not depend on:
Answer» the NATURE of the gas the TEMPERATURE of the gas the pressure of the gas units of measurement Answer :A::B::C

Discussion

6.	In the equation, NO_2^-+ H_2O rarr NO_3^- +2H^++ ne- stand for :
Answer» 1 2 3 4 Answer :B

Discussion

7.	In the equation of state of an ideal gas PV = nRT,the value of the universal gas constant would depend only on
Answer» the nature of the gas the PRESSURE of the gas the units of the measurement none of these Solution :The value of UNIVERSAL gas constant can be EXPRESSED in different units and its value would DEPEND only on the units of the measurement.

Discussion

8.	In the equation N_(2)+3H_(2) hArr 2NH_(3) the equality realationship between (d[NH_(3)])/(dt) and -(d[H_(2)])/(dt) is
Answer» `+(d[NH_(3)])/(DT)=-(3)/(2)(d[H_(2)])/(dt)` `(d[NH_(3)])/(dt)=-(d[H_(2)])/(dt)` `(d[NH_(3)])/(dt)=-(1)/(3)(d[H_(2)])/(dt)` `+(d[NH_(3)])/(dt)=-(2)/(3)(d[H_(2)])/(dt)` Answer :D

Discussion

9.	In the equation 4M+8CN^(-)+2H_(2)O+O_(2)rarr 4[M(CN_(2))]^(-)+4OH^(-) The metal M is
Answer» Copper Iron Gold Zinc Solution :`4Au+8KCN+2H_(2)O+O_(2)rarrKunderset("complex)")underset("(Soluble")([Au(CN)_(2)])+4KOH`

Discussion

10.	In the equation G^(@) = Rk, what is G^(@) ?
Answer» SOLUTION :CELL CONSTANT

Discussion

11.	In the froth floatation process of concentration of ores, the ore particles float because they:
Answer» are light are insoluble have the SURFACE which is not wetted EASILY by water have a CONSTANT ELECTRICAL charge Answer :C

Discussion

12.	In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by……….
Answer» Using collectors. Adjusting the proportion of oil to water. Using depressant. Using FROTH stabilisers. SOLUTION :ZnS and PBS can be SEPARATED by adjusting proportion of oil to water or by adding DEPRESSANTS such as NaCN.

Discussion

13.	In the equation 4M + 8CN^(-) + 2H_2O + O_(2) to 4[M(CN)_(2)]^(-) + 4OH^(-) the metal M is....
Answer» COPPER IRON Gold Zinc ANSWER :C

Discussion

14.	IntheFrothFloatationprocess,zinc sulphideandleadsulphidecan beseparatedby ....... .
Answer» usingcollectors adjustingtheproportion ofoil towater usingdepressant usingthefrothstabilisers Answer :B::C

Discussion

15.	In the equation , 4M + 8CN^(-) + 2H_(2)O + O_(2) to 4 [M(CN)_(2)]^(-) + 4OH^(-),the metal M is _________.
Answer» copper iron gold zinc Answer :C

Discussion

16.	In the equation 4M+8CN^(-)+2H_(2)O+O_(2) rarr 4[M(CN)_(2)]^(-)+4OH^(-) Identify the metal M
Answer» Copper Iron Gold Zinc Solution :`4 AU+8 CN^(-)+2 H_(2)O+O_(2) RARR 4[Au(CN)_(2)]^(-)+4OH^(-)`.

Discussion

17.	In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.
Answer» Non-wettability of the MINERAL PARTICLES in froth. non-wettability of the mineral particles in water. Non-wettability of the GANGUE particles in froth Non-wettability of the gangue particles in water Answer :B

Discussion

18.	In theequatio,4M +8 CN^(-) +2 H_2O+O_2to4[M(CN)_2]^(-) +4 OH ^(-),the metalM is
Answer» COPPER Iron Gold Zinc. ANSWER :C

Discussion

19.	In the equation , 4M +8CN^(-) +2H_2O+O_2 rarr 4[M(CN)_2]^(-)+4OH^(-), the metal M is
Answer» COPPER IRON GOLD Zinc Answer :C

Discussion

20.	In the Ellingham diagram for the formation of carbon monoxide
Answer» `((DELTAS^(@))/(DeltaT))` is negative `((DELTAG^(@))/(DeltaT))` is POSITIVE `((DeltaG^(@))/(DeltaT))` is negative intially `(DeltaT)/(DeltaG^(@))` is positive,after `700^(@)`C,`((DeltaG^(@))/(DeltaT))` is negative Answer :C

Discussion

21.	In the energy level sequence for amulti electron atom, 4f- orbial lies between
Answer» 6s and 5d 5P and 5d 4p and 5p 5d and 6d Solution :The sequence of energy LEVELS is 1s, 2s, 2p, 3S, 3p, 4s,3d,4p, 5s, 4d, 5p, 6s, 5d, 4F, 6p.

Discussion

22.	In the froth-floatation process for bencfaction of the ores, the particles float because
Answer» they are light their SURFACE is wetted by oil they BEAR ELECTROSTATIC charge they are insoluble. Solution :ORE particles float because their surface is wetted by oil.

Discussion

23.	In the Ellingham diagram, for the formation of carbon monoxide
Answer» `((DELTA S^(@))/(Delta T))` is negative `((Delta G^(@))/(Delta T))` is positive `((Delta G^(@))/(Delta T))` is negative initially `((Delta T)/(Delta G^(@)))` is positive, after `700^(@)C`, `((Delta G^(@))/(Delta T))` is negative ANSWER :C

Discussion

24.	Inthefrothfloatation process forbenefaction oftheores,the oreparticlesfloatbecause
Answer» THEYARE LIGHT their surfaceisnoteasilywettedbywater theybearelectrostatic charge theyare insoluble Solution :Oreparticlesfloatbecausetheirsurfaceis wettedby OIL, i.e.,noteasilywettedby water.

Discussion

25.	In the elimination reactions in the formation of alkenes the reactivity of halogens in alkyl halides follow the order:
Answer» `I GT BR gt CL` `Cl gt Br gt I` `Br gt Cl gt I` None Answer :A

Discussion

26.	In the electrothermal process, the compound displaced by silica from calcium phosphate is
Answer» CALCIUM phosphide phosphine phosphorus phosphorus pentoxide Solution :`[Ca_(3)(PO_(4))_(2)+3SiO_(2)to3CaSiO_(3)+P_(2)O_(5)]xx2` `(2P_(2)O_(5)+10CtoP_(4)+10CO)/(2Ca_(3)(PO_(4))_(2)16SiO_(2)+10Cto6CaSiO_(3)+P_(4)+10CO)`

Discussion

27.	In the froth flotation process for the purification of minerals the particles float because
Answer» they are LIGHT they are insoluble theirsurface is PREFERENTIALLY WETTED byoil theybear an electrostaticcharge Answer :C

Discussion

28.	In the elimination reaction of ethyl halide carbon atom change its hybridisation is,
Answer» `SP^(2)"to"sp^(3)` `sp^(3)"to"sp` `sp^(3)" to "sp^(2)` `sp" to "sp^(3)` ANSWER :C

Discussion

29.	In the Freundlich isotherm ((x)/(m)=k _(p) ^(1//n)) plot of log ""x/m vs log p, the intercept is (where, x,m,p and k are mass of the gas, mass of adsorbent, pressure and constant which depend on the nature of the adsorbent, respectively)
Answer» K logk `E^(k)` In`(1)/(k)` ANSWER :C

Discussion

30.	In the Frasch process, molten sulphur rises up from the
Answer» INNER pipe Outer pipe Middle pipe All of these Answer :C

Discussion

31.	In the electrorefining of metals, impure metal is:
Answer» CATHODE and it oxidizes anode and it oxidizes anode and it reduces cathode and it reduces Answer :B

Discussion

32.	In the fractional distillation of crude petroleum
Answer» PETROL condenses at the BOTTOM of the column The gases condense at the top of the column High boiling CONSTITUENTS condense at the bottom of the column High boiling constituents condense at the top of the column Answer :C

Discussion

33.	In electrorefining process the impure metal is made as ____ .
Answer» Cathode Anode Both None Answer :B

Discussion

34.	In the fourth period of the periodic table, how many elements have one or more 4d electrons:
Answer» 2 18 0 6 Answer :C

Discussion

35.	In the electrorefining of copper,some gold is deposited as:
Answer» ANODE mud cathode mud cathode electrolyte Answer :A

Discussion

36.	In the fourth group, Mn(OH)_2 on heating with Pb O_2 and conc. HNO_3 gives pink colour due to the formation of
Answer» `KMnO_(4)` `K_(2)MnO_(4)` `PB(MnO_(4))_(2)` `PbMnO_(4)` Solution :`Mn(OH)_(2) +2HNO_(3) to Mn(NO_(3))_(2) +2H_(2)O` `2MN(NO_(3))_(2)+5PbO_(2)+6HNO_(3)` `to underset("Purple colour")(2KMnO_(4)+5Pb(NO_(3))_(2)+2H_(2)O`

Discussion

37.	In the electroplating of steel sppon by silver, steel spoon acts as
Answer» Electrolyte ANODE Cathode Insert electrode Solution :On an article the negative charge i.e. PRESENCE of ELECTRON makes metal ions from solution to deposit, UNDERGOING reduction reaction.

Discussion

38.	In the froth floatation process for the purification of ores the particles float because……
Answer» They are light Their SURFACE is not easil wetted by water they BEAR ELECTROSTATIC charge they are insoluble Answer :B

Discussion

39.	In the formula Fe(eta^(5)-C_(5)H_(5)) what does the prefix eta_(5) denote ?
Answer» SOLUTION :`ETA^(5)` DENOTES that all the five C-atoms of `C_(5)H_(5)` are linked to the central METAL atom, Fe.

Discussion

40.	In the electroplating of silver over an article made of iron , the electrolyte generally used is
Answer» `AgNO_(3)` `AgCl` `Ag_(2)SO_(4)` `NA[AG(CN)_(2)]` Solution :COMPLEXES are preferred .

Discussion

41.	In the formation of sulphur trioxide by contact process,2SO_2 + O_2 to 2SO_3, the rate of reaction was measured as -(d[O_2])/(dt)= 2.5 xx 10^(-4)mol L^&(-1) s^(-1) Rate of reaction expressed in terms of SO_3 will be
Answer» `-5.0 xx 10^(-4)` mol ` L^(-1)s^(-1)` `-1.25 xx 10^(-4)`mol `L^(-1) s^(-1)` `2.5 xx 10^(4)` mol `L^(-1) s^(-1)` `5.00 xx 10^(-4)` mol `L^(-1) s^(-1)` Solution :The RATE of reaction is same as expressed in TERMS of anyreactant or PRODUCT.

Discussion

42.	In theelectroplating of gold the electrolyte used is :
Answer» ANSWER :D

Discussion

43.	In the formation of sulphur trioxide by the contact process, 2SO_(2(g))+O_(2(g))harr2SO_(3(g)) The rate of reaction is expressed as -(d[O_(2)])/(dt)=2.5xx10^(-4)" M sec"^(-1). The rate of disappearance ("in mol L s"^(-1)) of SO_(2) will be
Answer» `5.0xx10^(-4)` `2.25xx10^(-4)` `3.75xx10^(-4)` `50.0xx10^(-4)` ANSWER :A

Discussion

44.	In the electrolytic refining of zinc.....
Answer» graphite is at the anode. the IMPURE metal is at the cathode. the metal ion GETS reduced at the anode. acidified ZINC sulphate is the ELECTROLYTE. Answer :D

Discussion

45.	In the formation of some complexes, electrons in the metal orbital may undergo pairing against
Answer» PAULI's principle Uncertainity principle Hund's principle Auf-bau rule Answer :C

Discussion

46.	In the formation of SO_(3) by contact process, the conditions used are
Answer» CATALYST, optimum TEMPERATUREE and higher CONCENTRATION or REACTANTS Catalyst, optimum temperatue and lower concentration of reactants Catalyst, high temperaturee and higher concentration of reactants Catalyst, low temperatue and lower concentration of reactants Solution :ACCORDING to Le chatelier's principle.

Discussion

47.	In the electrolytic refining of zinc.........
Answer» graphite is at the ANODE the IMPURE METAL is at the cathode the metal ION gets reduced at the anode acidified ZINC sulphate is the electrolyte . Answer :D

Discussion

48.	In the electrolytic refining of copper, which one of the following is used as anode ?
Answer» PURE copper Impure copper Carbon rod Platinum electrode Answer :B

Discussion

49.	In the electrolytic reduction of pure Al_2O_3. Fluorspar (CaF_2) is added to
Answer» Reduce the MELTING temperature of the mixture Improve the electrical conductivity of the melt Reduce `Al_2O_3` Both (1) and (2) Answer :D

Discussion

50.	In the electrolytic reduction of alumina, the anodic product is
Answer» Al Na `O_(2)` `H_(2)` ANSWER :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In the galvanizing process, iron is coated with zinc. The resulting chemical protection is most similar to that provided when:

In the gaseous equilibrium H_(2)X_(2) + heat hArr 2HX, the formation of HX will be favoured by

In the equation : Rate =PZ_(AB)e^(-Ea//RT), what does P represent ?

In the frouth floatation process, zinc sulphide and lead sulphide can be separated by

In the equation PV RT, the value of R will not depend on:

In the equation, NO_2^-+ H_2O rarr NO_3^- +2H^++ ne- stand for :

In the equation of state of an ideal gas PV = nRT,the value of the universal gas constant would depend only on

In the equation N_(2)+3H_(2) hArr 2NH_(3) the equality realationship between (d[NH_(3)])/(dt) and -(d[H_(2)])/(dt) is

In the equation 4M+8CN^(-)+2H_(2)O+O_(2)rarr 4[M(CN_(2))]^(-)+4OH^(-) The metal M is

In the equation G^(@) = Rk, what is G^(@) ?

In the froth floatation process of concentration of ores, the ore particles float because they:

In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by……….

In the equation 4M + 8CN^(-) + 2H_2O + O_(2) to 4[M(CN)_(2)]^(-) + 4OH^(-) the metal M is....

IntheFrothFloatationprocess,zinc sulphideandleadsulphidecan beseparatedby ....... .

In the equation , 4M + 8CN^(-) + 2H_(2)O + O_(2) to 4 [M(CN)_(2)]^(-) + 4OH^(-),the metal M is _________.

In the equation 4M+8CN^(-)+2H_(2)O+O_(2) rarr 4[M(CN)_(2)]^(-)+4OH^(-) Identify the metal M

In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.

In theequatio,4M +8 CN^(-) +2 H_2O+O_2to4[M(CN)_2]^(-) +4 OH ^(-),the metalM is

In the equation , 4M +8CN^(-) +2H_2O+O_2 rarr 4[M(CN)_2]^(-)+4OH^(-), the metal M is

In the Ellingham diagram for the formation of carbon monoxide

In the energy level sequence for amulti electron atom, 4f- orbial lies between

In the froth-floatation process for bencfaction of the ores, the particles float because

In the Ellingham diagram, for the formation of carbon monoxide

Inthefrothfloatation process forbenefaction oftheores,the oreparticlesfloatbecause

In the elimination reactions in the formation of alkenes the reactivity of halogens in alkyl halides follow the order:

In the electrothermal process, the compound displaced by silica from calcium phosphate is

In the froth flotation process for the purification of minerals the particles float because

In the elimination reaction of ethyl halide carbon atom change its hybridisation is,

In the Freundlich isotherm ((x)/(m)=k _(p) ^(1//n)) plot of log ""x/m vs log p, the intercept is (where, x,m,p and k are mass of the gas, mass of adsorbent, pressure and constant which depend on the nature of the adsorbent, respectively)

In the Frasch process, molten sulphur rises up from the

In the electrorefining of metals, impure metal is:

In the fractional distillation of crude petroleum

In electrorefining process the impure metal is made as ____ .

In the fourth period of the periodic table, how many elements have one or more 4d electrons:

In the electrorefining of copper,some gold is deposited as:

In the fourth group, Mn(OH)_2 on heating with Pb O_2 and conc. HNO_3 gives pink colour due to the formation of

In the electroplating of steel sppon by silver, steel spoon acts as

In the froth floatation process for the purification of ores the particles float because……

In the formula Fe(eta^(5)-C_(5)H_(5)) what does the prefix eta_(5) denote ?

In the electroplating of silver over an article made of iron , the electrolyte generally used is

In the formation of sulphur trioxide by contact process,2SO_2 + O_2 to 2SO_3, the rate of reaction was measured as -(d[O_2])/(dt)= 2.5 xx 10^(-4)mol L^&(-1) s^(-1) Rate of reaction expressed in terms of SO_3 will be

In theelectroplating of gold the electrolyte used is :

In the formation of sulphur trioxide by the contact process, 2SO_(2(g))+O_(2(g))harr2SO_(3(g)) The rate of reaction is expressed as -(d[O_(2)])/(dt)=2.5xx10^(-4)" M sec"^(-1). The rate of disappearance ("in mol L s"^(-1)) of SO_(2) will be

In the electrolytic refining of zinc.....

In the formation of some complexes, electrons in the metal orbital may undergo pairing against

In the formation of SO_(3) by contact process, the conditions used are

In the electrolytic refining of zinc.........

In the electrolytic refining of copper, which one of the following is used as anode ?

In the electrolytic reduction of pure Al_2O_3. Fluorspar (CaF_2) is added to

In the electrolytic reduction of alumina, the anodic product is