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.	Potassium bromide, KBr containss, 32.9% by mass of potassium. If 6.40 g of bromine reacts with 3.60 g of potassium, calculate the number of moles of potassium which combine with bromine to form KBr.
Answer» SOLUTION :In KBr, 32.9 g of K are combined with 67.1 g of Br `THEREFORE"3.6 g of K will combine with "Br_(2)=(67.1)/(32.9)xx3.6g=7.34" g which is not PRESENT"` `"or6.4 g or "Br_(2)" will combine with K"=(32.9)/(67.1)xx6.4=3.14g` Thus, `Br_(2)` is the limiting reactant. `"K reacted= 3.14 g"=(3.14)/(36)" MOLE = 0.08 mole"` (K left unreacted `=(3.60-3.14)g=0.46g`)

2.	Potash solution is not recommended in a hydrocarbon - oxygen fuel cell. Why ?
Answer» SOLUTION :The combustion products of a hydrocarbon are `CO_2` and `H_2O.CO_2` is a non-metallic OXIDE and acidic. It is absorbed in the electrolyte if KOH is used. To avoid this, phosphoric ACID is used as electrolyte in hydrocarbon-oxygen fuel cell.

3.	Potash solution is not recommended in a hydrocarbon-oxygen fuel cell. Why?
Answer» Solution :The combustion products of a HYDROCARBON are `CO_(2)` and `H_(2)O.CO_(2)` is a non-metallic oxide and acidic. It is ABSORBED in the electrolyte if KOH is used. To avoid this, phosphoric acid is used as electrolyte in hydrocarbon-oxygen fuel cell.

4.	Potash alum is water soluble and ionises in aqueous solution to give :
Answer» ONE TYPE of ions Two TYPES of ions Three types of ions Four types of ions Answer :C

5.	Potash alum is K Al(SO_4)_2. 12H_2O. As a strong eletrolyte, it is considered to be 100% dissociated into K^+, Al^(3+) and SO_4^(2-). The solution is acidic because of the hydrolysis of Al^(3+), but not so acidic as might be expected, because the SO_4^(2-) can sponge up some the H_3O^+ by forming HSO_4^-. Given a solution made by dissolving 11.85 gm of KAl(SO_4)_2.12H_2O in enough water to make 100cm^3 of solution. Match the Column
Answer» ANSWER :A::B::C::D

6.	Potash alum is K Al(SO_4)_2. 12H_2O. As a strong eletrolyte, it is considered to be 100% dissociated into K^+, Al^(3+) and SO_4^(2-). The solution is acidic because of the hydrolysis of Al^(3+), but not so acidic as might be expected, because the SO_4^(2-) can sponge up some the H_3O^+ by forming HSO_4^-. Given a solution made by dissolving 11.85 gm of KAl(SO_4)_2.12H_2O in enough water to make 100cm^3 of solution. Only Al3^+ is hydrolysing and its first hydrolsis constant is 1.4 xx 10^(-5)M
Answer» `1.87 xx 10^(-3)M` `6.24 xx 10^(-4)M` `0.09M` None of these Answer :A

7.	Potash alum is K Al(SO_4)_2. 12H_2O. As a strong eletrolyte, it is considered to be 100% dissociated into K^+, Al^(3+) and SO_4^(2-). The solution is acidic because of the hydrolysis of Al^(3+), but not so acidic as might be expected, because the SO_4^(2-) can sponge up some the H_3O^+ by forming HSO_4^-. Given a solution made by dissolving 11.85 gm of KAl(SO_4)_2.12H_2O in enough water to make 100cm^3 of solution. Both Al^(3+) and SO_4^(2) are hydrolysing
Answer» `2.93 xx 10^(-4)M` `0.0114M` `5.43 xx 10^(-6)M` NONE of these Answer :A

8.	Potash alum is K Al(SO_4)_2. 12H_2O. As a strong eletrolyte, it is considered to be 100% dissociated into K^+, Al^(3+) and SO_4^(2-). The solution is acidic because of the hydrolysis of Al^(3+), but not so acidic as might be expected, because the SO_4^(2-) can sponge up some the H_3O^+ by forming HSO_4^-. Given a solution made by dissolving 11.85 gm of KAl(SO_4)_2.12H_2O in enough water to make 100cm^3 of solution. What is [H3O^+] of the solution if 27. None of the ion is hydrolysing
Answer» `10^(-7)M` LESS than `10^(-7)M` More than `10^(-7)M` 0 Answer :A

9.	possible product can be :
Answer» SOLUTION :(a) MINOR PRODUCT KCP by 1,2-addtion. (B) Minor product by 1,4--adentical.

10.	Potash alum is
Answer» `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` `K_(2)SO_(4).Al_2(SO_(4))_(3).18H_(2)O` `(NH_(4))_(2)SO_(4).K_(2)SO_(4).24H_(2)O` None of these Solution :POTASH ALUM is `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`

11.	Possible number of orientations of a subshell is:
Answer» l n 2l+1 `n^2` ANSWER :C

12.	Possible monochloro derrivative product (excluding stereo isomer) :-
Answer» 4 5 3 6 Solution :.

13.	Possible isomers of monohydric phenol having molecular formula C_(7)H_(8) are …………
Answer» 3 4 1 2 Answer :A

14.	Possible isomers of monohydric phenol having molecular formula C_(7) H_(8)Oare ..
Answer» 3 4 1 2 Solution :3

15.	Positron has nearly the same mass as that of:
Answer» `ALPHA`-particle Protons Neutron Electron Solution :Mass (WEIGHT) of POSITRON and electron is `9.11 xx 10^(-31) kg`

16.	Positively charged colloidal solution is
Answer» `SnO_(2)` `As_(2)S_(3)` GUM NONE of these Answer :A

17.	" Positronium " is the name given to an aotm like combination formed between :
Answer» A POSITRON and a proton A positron and a neutron A positron and `ALPHA`-particle A positron and an electron Answer :D

18.	Positron emission results from the transformation of one nuclear proton into neutron. The isotope thus produced possesses
Answer» Same mass number Higher NUCLEAR charge Intense radioactivity No radioactivity Solution :Mass no. will REMAIN same as proton is REPLACED by NEUTRON

19.	Positive Tollen'stest is observed for
Answer» SOLUTION : tollen.s TESTIS GIVENBY compoundshavingaldehydicgroupand ` ALPHA ` 0- hydroxycarbonylcompounds

20.	Positive Tollens' test is observed from
Answer» Solution :`alpha,BETA`-UNSATURATED aldehydes, aromatic aldehydes and `alpha`-hydroxyketones all give tollens' test but ketones (including `alpha,beta`-unsaturated) do not give this test. THUS, option (a,B and c) are CORRECT.

21.	Positive value of electron gain enthalpy (Delta H_("eg")) among the following will be of:
Answer» MG NE AR all of these ANSWER :D

22.	PositiveTollen's test is observed for
Answer» SOLUTION :Both aldehydes & `ALPHA`-hydroxyketones show positive TOLLEN's test. The compound (d) is not `alpha`-hydroxy-ketone and it does EXHIBIT positive iodoform test. Compounds(a), (b) and (C ) exhibit

23.	Positive Tollen's test is observed for
Answer» Solution :Beside ALDEHYDE `alpha`-hydroxy ketones can also SHOW Tollen's test due to rearrangement in aldehyde via enediol INTERMEDIATE. (however this needs a TERMINAL `alpha`-carbon)

24.	Positive pollution of soil is due to:
Answer» EXCESSIVE USE of fertilizers Addition of WASTES on SOIL Reduction in soil productivity All of these Answer :D

25.	Positive deviations from ideal behaviour take place because of :
Answer» MOLECULAR interactions between atoms and PV/nRT `lt` 1 molecular interactions between atoms and PV/nRT `GT` 1. FINITE SIZE of atoms and PV/nRT `gt1` finite size of atoms and PV/nRT `lt` 1 Answer :B

26.	Positive carbylamine test is shown by
Answer» N,N-dimethylaniline triethylamine N-methylaniline p-methylbenzylamine Solution :Only `1^(@)` AMINES, i.e., p-methylbenzylamine, (p) `CH_(3)-C_(6)H_(4)-CH_(2)NH_(2)`, GIVE carbylamine test.

27.	Positive Beilstein test shows that :
Answer» HALOGENS are SURELY present Halogens are absent Halogens MAY be present None of the above Answer :C

28.	Position of double bond in an organic compound is determined by
Answer» Ozonolysis Oxidation Reduction Hydrogenation Solution :Ozonolysis is useful in locating the position of a double bond in an alkene. The double bond is obtained by joining the carbon atoms of the two carbonyl compounds. For example let the PRODUCT of ozonolysis be two molecules of ETHANAL . `CH_3-OVERSET(H)overset(\|)C=O+O=oversetoverset(H)(\|)C-CH_3 to CH_3 -UNDERSET"2-Butene"(CH=CH)-CH_3`

29.	What are non-polar and polar covalent bonds? Give examples.
Answer» Polar on OUTER SURFACE and non polar on inner surface Polar on inner surface and non polar on outer surface Distributed over all the surface Are persent on the surface only Answer :A

30.	Portland cement is:
Answer» CALCIUM alumino silicate Calcium ALUMINATE + Calcium silicate A MIXTURE of calcium OXIDE, aluminium oxide and silica Calcium silicate + gypsum Answer :B

31.	P–O–P bond is absent in :-
Answer» <P>Dimetaphosphoric ACID Pyro phosphorous acid Cyclic trimetaphosphoric acid Hypo phosphorous acid Solution :(i) Dimetaphosphoric acid (ii) 2 mole `H_(3)PO_(3) to H_(4)P_(2)O_(5)` pyrophosphorous acid (iii) (iv)Hypophosphorous acid -

32.	Poor conductor of electricity is
Answer» `aq.H_(2)F_(2)` `aq.HCl` `aq.HBr` `aq.Hi` ANSWER :A

33.	Polyvenyl alcohol is prepared using which starting monomer ?
Answer» Venyl ALCOHOL Venyl accetate Venyl CYANIDE ACRYLIC ACID SOLUTION :N//A

34.	Polyvinyl choride is ….. Polymer
Answer» elastomer FIBRES THERMOPLASTIC THERMOSETTING Answer :C

35.	Polyvinylalcohol can be prepared by
Answer» polymerization of vinyl alcohol alkaline hydrolysis of polyvinyl acetate polymerization of ACETYLENE reaction of acetylene with `H_2SO_4` in presence of `HgSO_4` Solution :Vinyl alcohol, `CH_2=CHOH`, monomer of polyvinyl alcohol exists mainly as `CH_3CHO`, HENCE polyvinyl alcohol is BEST PREPARED by the alkaline hydrolysis of polyvinyl acetate which in turn is prepared by the polymerisation of vinyl acetate

36.	Polyurethanes:
Answer» <P>Have structure features of both an ester andan amide. Have aformula`H_(2)N-underset(O)underset(\|\|)(C )-O-CH_(2)-CH_(3)`. Are obtianed from`p`-PHENYLENE disocyanate and ethylene glycol. Are used as foam rubber in upholstery. Answer :C

37.	Polythene, PVC, Bakelite, polystrene.
Answer» Solution :BAKELITE. It is thermosetting PLASTIC WHEREAS OTHERS are THERMOPLASTIC.

38.	Polythene is prepared by the polymerisation of ethane at 350-570 K at high pressure in the presence of traces of__________.
Answer» SOLUTION :PEROXIDES

39.	Polysubstitution occurs forwhich of the following reactions-
Answer» `C_6H_6+CH_3CH_2CH_2Cl overset("ANHYDROUS" AlCl_3)to` `C_6H_6+CH_3CH=CH_2 overset("CONC." H_2SO_4)to` `C_6H_6+CH_3CH_2COCl overset(1."anhydrous" AlCl_3)underset(2."Zn-Hg//conc.HCl)to` all of the above Answer :B

40.	Polythene is a resin obtained by polymerisation of
Answer» Butadiene Ethylene Isoprene Styrene Answer :C

41.	Polythene, PVC are _____.
Answer» SOLUTION :HOMOPOLYMER

42.	polythene is a\an____.
Answer» ADDITION copolymer addition HOMOPOLYMER CONDENSATION POLYME thermosetting polymer Answer :B

43.	Polythene is a ................homopolymer while bakeline is a ..........copolymer.
Answer» ANSWER :THERMOPLASTIC , THERMOSETTING

44.	Polythene.
Answer» SOLUTION :It is used in the manufacture of bags, BOTTLES, TOYS, PIPES, etc.

45.	Polystyrene is an example of _______ polymer.
Answer» CONDENSATION ADDITION natural homopolymer Solution :NYLON is not an EXAMPLE of addition POLYMER.

46.	Polystyrene is of which type polymer ?
Answer» NATURAL SEMI SYNTHETIC Synthetic NONE of these SOLUTION :Synthetic

47.	Polystyrene is not an example of addition polymer.
Answer» SOLUTION :NYLON is not an EXAMPLE of ADDITION POLYMER.

48.	Polystyrene is a :
Answer» Addition POLYMER Thermoplastic polymer Both (A) and (B) NONE of these Answer :C

49.	Polystyrene , dacron and orlon are classified respectively as
Answer» CHAIN GROWTH, STEP growth , step growth Chain growth , step - growth , step growth Chain growth, step - growth , chain growth Step growth, step growth , chain growth Answer :C

50.	Polysaccharides have … linkages.
Answer» GLYCOSIDIC anomeric epimeric POLYMORPHIC ANSWER :A