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.

{:(,"Column-I",,"Column-II"),("A)", (SiO_(3))_(n)^(2n-),"P)","Cyclic silicate"),("B)","Silicone","Q)","Chain silicate"),("D)",(Si_(4)O_(11))_(n)^(6n-),"S)","Pyrosilicate"):}

Answer»


Solution :`rarr` All silicates having Si-O-Si bonds.
`rarr` Chain silicate have
`(SiO_(3))_(N)^(-2n) ` & ` ( Si_(4)O_(11))_(n)^(-6N)` as general formula
Discussion
2.

{:("Column-I","Column-II"),((A) NO_(3)^(-),(P)"Numerical value of oxidation number of central ato.m is equal to its covalency in the given species "),((B) CO_(3)^(2-), (Q) "Negative charge on central atom "),((C) ICI_(4)^(-),(R)"Maximum possible oxidation number of central atom "),((D) SO_(3)^(2),(S)"Minimum possible oxidation number of surrounding atom "),("",(T) "One co-ordinate covalent bond is present"):}

Answer»


ANSWER :A-RST; B-PRS; C-QST; D-PS
Discussion
3.

Identify the reactions in which dichromate acts as an oxidising reagent . I . Cr_(2)O_(7)^(2)+6Fe^(2+)+14H^(+)rarr 2Cr^(3+) +6Fe^(3+)+7H_(2)O II. Cr_(2)O_(7)^(2-)+2OH^(-1) rarr2CrO_(4)^(2-)+H_(2)O III. Cr_(2)O_(7)^(2-)+6I+14H^(+)rarr 2Cr^(3+)+3I_(2)+7H_(2)O IV. Na_(2)Cr_(2)O_(7)+2KCI rarr K_(2)Cr_(2)O_(7)+2NaCI

Answer»


ANSWER :A-T; B-PQRS; C-RST; D-PQRST
Discussion
4.

{:("Column-I","Column-II"),("A) "NH_(3),"P) EF = MF"),("B) "N_(2)H_(4),"Q) MF = "(EF)_(2)),("C) "N_(3)H,"R) Maximum percentage of nitrogen by mass "),("D) "C_(2)N_(2),"S) Least percentage of nitrogen by mass"):}

Answer»


Solution :`N_(2)H_(4)`, EMPIRICAL formula = `NH_(2)`
`N_(3)H` (hydrazoic acid) % of nitrogen = `(42)/(43)XX100`
`C_(2)N_(2)` (cyanogen) % of nitrogen = `(28)/(52)xx100`
Discussion
5.

{:("Column -I","Column-II"),((A) (H_(2)O)_(n),(P)"Ionic bond "),((B) C_(2)H_(2),(Q)"Covalent bond"),((C) KCN ,(R) "Co-ordinate bond "),((D) K_(4)[Fe(CN)_(6)],(S)"Hydrogen bond"):}

Answer»


ANSWER :A-QS; B-Q; C-PQ; D-PQR
Discussion
6.

{:("Column I","Column II"),("(A) Emulsion","p Colloidal solution"),("(B) sol","q Dye test"),("(C) Tyndall effect ","r Milk"),("(D) Colligative properties ","s Haemoglobin"):}

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ANSWER :A::B::C::D
Discussion
7.

{:("Column I","Column II"),("(A) Electrophores","p Movement of molecules of dispersion medium"),("(B) Electro-osmosis","q Determination at Avogador's number"),("(C) Tyndall effect","r Ultra-microscope"),("(D) Brownian motion","s Determination of charge on colloidal particle."):}

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ANSWER :A::B::C::D
Discussion
8.

{:("Column-I","Column-II"),("A) "Cu^(2+)+I^(-)rarrCu_(2)I_(2),"P) Eq.wt.=M.wt/6"),("B) "Cu+Cl^(-)rarrCuCl_(2)+...,"Q) Eq.wt.o=M.wt/5"),("C) "MnO_(4)^(-)+H^(+)+e^(-)rarrMn^(2+)+...,"R) Eq.wt.=M.wt/1"),("D) "Cr_(2)O_(7)^(2-)rarrCr_(2)O_(3)....,"S)Eq.wt.=M.wt/2"):}

Answer»


Solution :A) `Cu^(+2)rarrCu^(+1)impliesn-f=1`
B) `Cu^(0)rarrCu^(+2)impliesn-f=2`
C) `MN^(+7)rarrMn^(+2)impliesn-f=5`
D) `Cr_(2)^(+6)rarrCr^(+3)impliesn-f=3xx2=6`
Discussion
9.

{:("Column I","Column II"),("(A) Chemisorption ","p Exothermic"),("(B) Physical adsorption","q Endothermic"),("(C) Desorption","r Removal of adsorbed material "),("(D) Activation of adsorbent","s Specifi in nature"):}

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ANSWER :A::B::C::D
Discussion
10.

{:("Column-I","Column-II"),("A) 22.4 volume "H_(2)O_(2),"P) 11.2 litres"),("B) 32 g oxygen","Q) "9.034xx10^(23)" atoms"),("C) 11.2 L "CO_(2)" at STP","R) 2 mole"L^(-1)),("D) 1 gram equivalent hydrogen at STP","S) "9.64xx10^(24)" electron"):}

Answer»


Solution :A) 1 vol `H_(2)O_(2)=3.03g//L`
22.4bol `H_(2)O_(2)=22.4xx3.03=67.87g//L`
`=~~2" moles/L"`
B) 32 G oxygen = 1 mole oxygen
= `6.023xx10^(23)` MOLECULES
`=6.023xx10^(23)xx16=9.64xx10^(24)` ELECTRONS
C) 11.2L `CO_(2)` at STP
`=(1)/(2)` mole `CO_(2)=(1)/(2)xx6.023xx10^(23)` molecules
`=(1)/(2)xx6.023xx10^(23)xx3` ATOM
`=9.034xx10^(23)` atom
D) 1 gram equivalent HYDROGEN
= 1 g hydrogen
Discussion
11.

{:("Column-I","Column-II"),("A) 16g of "O_(2),"P) 1gm atom of O"),("B) Gram molar volume of "H_(2)O,"Q) 22.4 lit at STP"),("C) 18 g of "H_(2)O,"R) 18 ml"),("D) 1/2 mole "O_(2)+1" gm atom of "H_(2),"S) 11.2 lit at STP"):}

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Solution :A) 16 gm = `(1)/(2)` mole = 11.2 lit at STP
`=(1)/(2)xxg` atoms of O
B) molar VOL = 22.4 lit at STP
C) 18g `H_(2)O` implies 1 mole implies 1 mole of O
= 18ml = 1GM atom of O
D) total moles = `(1)/(2)+(1)/(2)=1 implies 22.4` lit at STP
`(1)/(2)` mole `O_(2)=(1)/(2)xx2g` atoms of O
Discussion
12.

{:("Column-I","Column-II"),("A) 1.2g of carbon","P) "4.8xx10^(23)" atoms"),("B) 3g of "CO_(2),"Q) "9.034xx10^(23)" atoms"),("C) 11.2 L "CO_(2)" at S.T.P.","Q) 0.1 moles"),("D) 0.2 moles "NH_(3),"S) "9.64xx10^(24)" electrons"):}

Answer»


SOLUTION :A) 1.2g C = 0.1 MOLES
B) 32g `O_(2)` implies 1 mole = `6XX10^(23)xx` atoms
`=12xx8xx10^(23)e^(-)`
C) 11.2L `CO_(2)`
`implies (1)/(2)` mole = `(1)/(2)xx6xx10^(23)xx` 3atoms
D) 0.2 moles `NH_(3)=0.2xx6xx10^(23)xx4` atoms
Discussion
13.

{:("Column-I","Column-II"),("A) 1 mole NaOH","P) 0.5 mole "H_(2)SO_(4)),("B)0.5 mole "Ca(OH)_(2),"Q) 1 mole HCl"),("C) 2 moles "KMnO_(2),"R) 16 moles Mohr.s salt solution"),("D) 1 mole "K_(2)Cr_(2)O_(7),"S) 5 moles oxalic acid solution"):}

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SOLUTION :`n_(1)xxn-f_(1)=n_(2)xxn=f_(2)`
Discussion
14.

{:(,"Column I",,"Column II (pH)"),((A),"MilK",(p),2.2),((B),"Human saliva",(q),6.4),((C),"Human blood",(r),6.8),((D),"Lemon juice",(s),7.4):}

Answer»

A-p, B-q, C-s, D-r
A-r, B-q, C-s, D-p
A-r, B-s, C-q, D-p
A-q, B-r, C-s, D-p

Answer :B
Discussion
15.

{:(,"Column I",,"Column II "), ((A),B_(2),(p),"Paramagnetic"),((B),N_(2),(q),"Undergoes oxidation "),((C),O_(2)^(-),(r),"Undergoes reduction"),((D),O_(2) ,(s),"Bond order"ge 2 ),(,,(t),"Mixing of s and p-orbitals"):}

Answer»


Solution :`(A) B_(2)= KK sigma (2s)^(2) sigma^(**) (2s)^(2) pi (2p_(x))^(1) pi(2p_(y))^(1)`
It containsunpaired electrons . Hence, it is
paramagnetic . Highest occupied molecular orbitals
are bonding . Addition of electron increases
stability . Hence , it undergoes reduction . BOND order
= 1. As 2s and 2p orbitlas are close , mixing of
these orbitals taken place.
`(B) N_(2)= KK sigma (2s)^(2) sigma^(**) (2s)^(2) pi (2p_(x))^(2) pi(2p_(y))^(2) sigma(2p_(z))^(2)`
All electrons are paired . Hence , it is diamagnetic .
All orbitalsare completely filled . It is stable.
Hence , it can neither gain nor lose electons/s, i.e.,
it does not undergo oxidition or reduction . Its bond
order = 3.2 and 2p orbitals are close . Hence , there
is 2s - 2p mixing .
`(C) O_(2)^(-)= KK sigma (2s)^(2) sigma^(**) (2s)^(2)sigma (2p_(z))^(2) pi (2p_(x))^(2)`
`pi(2p_(y))^(2) pi^(**)(2p_(x))^(2) pi^(**) (2p_(y))^(1)`
Itis paramagnetic . Loss of electrons from
antibonding molecular orbitals orbitals will increase
stability. Hence, it undergoes OXIDATION . Bond
order = 1.5 . 2s and 2p orbitals have LARGE
DIFFERNECE in energy . There is no 2s - 2pmixing .
`(D) O_(2)= KK sigma (2s)^(2) sigma^(**) (2s)^(2)sigma (2p_(z))^(2) pi (2p_(x))^(2)`
`pi(2p_(y))^(2) pi^(**)(2p_(x))^(1) pi^(**) (2p_(y)^(1))`
It is paramagnetic .Lose of electrons frm anti-
bonding molecular orbitals will increase
stability . Hence , it undergoes oxidation . Bond
order 2. As 2s and 2p have large difference in
energy , there is no 2s- 2p mixing
Discussion
16.

{:("Column - I (Vol. of NaOH added)" ,, "Column- II (pH of resultant solution)") , ("A) 150 mL of NaOH" ,, "P)" pH = p^(ka2)), ("B)" 75 mL of NaOH ,, "Q)" = pH = p^(KaI)), ("C)" 25 mL of NaOH ,, "R)" pH = 7 + [(pKa_(3) + logc)/(2)]) , ("D)" 100 mL of NaOH ,, "S)" pH= (P_(k_(a2)) + p_(K_(a3)))/(2)):}

Answer»


Solution :`{:( H_3PO_4 + ,NAOH to ,NaH_2PO_4 +H_2O ),(0.1 xx 50, 0.1 xx 25 , -),(5 m "mole " , 2.5 m " mole " , 0 ), ( 2.5 ,- , 2.5 m " mole " ):}`
` underset( _) ( 2.5 m " mole ") `
`pH =P^(Ka_1) `
Further addition of 25 ml NaOH , only`NaH_2PO_4` ( 5 m moles )will be formed
Further additionof 25 mlNaOH ( Total 75 ml)`{:(NaH_2PO_4+,NaOH to , Na_2 HPO_4 + H_2O),( 5 m " moles" , 2.5 m " moles ", 0), ( 2.5 , -, -), ( 2.5 m " moles " , - ,2.5 m " moles "):}`
` therefore pH =p^(ka_2) `
Further additionof 25 ml NaOH , only ` Na_2 HPO_4`
( 5 m moles )wll be formed
` pH= (P^(Ka_2)+ P^(Ka_3))/( 2) `
Further addition of 25 ml ( Total 125 ml)
` {:( Na_2HPO_4 +, NaOH to, Na_3PO_4+H_2O) ,( 5 m " moles " , 2.5 m " moles " ,0), (underset(-) (2.5 m " moles ") , - , 2.5 m " moles " ):} `
` therefore pH = pK^(a_3),` Furtheraddition of 25 ml (Total 150 ml)only`Na_3PO_4 ` salt will be formed
` pH =7+ ( p ^(Ka_3))/(2) + ( 1)/(2)log C `
Discussion
17.

{:("Column I (Type of crystal)", "Column II (Example/Property)"),("(A) Ionic solids" , "(p) Dry ice"),("(B) Molecular solids", "(q) Brass"),("(C) Covalent solids" , "(r) Generally insulators"),("(D) Metallic solids" , "(s) Generally have low melting points"):}

Answer»


ANSWER :A-s, B-p-s, C-r, D-q
Discussion
18.

{:("Column I (Type of crystal)", " Column II (Location of cations/anions"),("(A) NaCl", " (p) Cations -fcc, Anions- all tetrahedral voids"),("(B) ZnS" , "(q) Anions -fcc, Cations-all tetrahedral voids"),("(C) CaF"_(2), "(r) Anions-fcc, Cations-all octahedral voids"),("(D) Na"_(2)O, "(s) Anions-fcc,Cations - aternate tetrahedral voids"):}

Answer»

A-r, B-s , C-p , D-q
A-q , B-p, C-s, D-r
A-s, B-p, C-r, D-q
A-r, B-s,C-q, D-p

Answer :c
Discussion
19.

{:(,"Column I (Solvent)",,"Column II (Nature)",),((A),"Methyl alcohol"(CH_(3)OH),(p),"Protophilic",),((B),"Benzene" (C_(6)H_(6)),(q),"Protogenic",),((C),"Ammonia" (NH_(3)),(r),"Amphiprotic",),((D),"Acetic acid" (CH_(3)CO OH),(s),"Aprotic",):}

Answer»


ANSWER :(A-p,R ; B-s; C-p,r ; D-q)
Discussion
20.

{:("Column - I (Reaction)","Column-II(Eq wt)"),("A) " NH_3 rarrNO_3^(-),"P)" M//3),("B) " FeC_(2)O_(4)rarrFe^(3+)+2CO_(3)^(2-),"Q)" M//6),("C) "H_(2)SO_(5)rarrS_(8),"R)"M//8),("D) "KMnO_(4)rarrMn^(2+),"S)" M//5),(,"T) reducing agent"):}

Answer»


SOLUTION :A) `NH_3 RARR NO_(3)^(-) - M//8` reducing agent
B) `FeC_(2)O_(4) rarr Fe^(3+)+2CO_(3)^(2-)0M//3` , reducing agent
C) `H_(2)SO_(5)rarrS_(8) -M//6`
D) `KMnO_(4) rarr Mn^(2+)-M//5`
Discussion
21.

{:("Column - I (Reaction)","Column-II(Eq wt)"),("A) "KMnO_(4)overset(H^(+))rarrMn^(+2),"P)" M//2),("B) " MgC_(2)O_(4)rarrMg^(2+)+CO_(2),"Q)" M//5),("C) "K_(2)Cr_(2)O_(7)rarrCr^(3+),"R)"M//6),("D) "CrO_(5)rarrCr_(2)O^(3),"S)" M//3),(,"T) Oxidising agent"):}

Answer»


Solution :A) `KMnO_(4)OVERSET(H^(+))rarrMn^(2+)-M//5`, Oxidising agent
B) `MgC_(2)O_(4)rarr Mg^(2+)+CO_(2)-M//2`
C) `K_2Cr_(2)O_(7) rarr Cr(+3) -M//3` , Oxidising agent
D) `CrO_(5) rarrCr_(2)O_3-M//3` , Oxidising agent
Discussion
22.

{:("Column I (Reaction)","Column II (Product)"),((A)Cu+dil.HNO_(3),(q)NO_(2)),((B)Cu+conc.HNO_(3),(q)NO_(2)),((C)Zn+dil.HNO_(3),(r)N_(2)O),((D)Zn+conc.HNO_(3),(s)Cu(NO_(3))_(2)),(,(t)Zn(NO_(3))_(2)):}

Answer»


ANSWER :`A-p,s;B-q,s;C-r,t;D-q,t`
Discussion
23.

{:(,"Column I( Solutions mixed)",,"Column II ( Heat evolved)"),((A),500 mL of 0.1 "M HCl acid"+200 mL of 0.2 M NaOH "solution",(p),4568J),((B),200 mLof 0.2MH_(2)SO_(4) + 400 mL of 0.5 M KOH "solution",(q),2284J),((C ),500 mL of 0.1M HCl+ 500 mL of 0.1 M NH_(4)OH,(r),2760 J),((D),500 mL of 0.1 M "acetic acid " + 500 mL of 0.1 M NaOH ,(s),2575J):} (a)A-r,B-p,C-s,D-q(b) A-p, B-r, C-q,D-s(c )A-q,B-p, C-s, D-r(d) A-,B-s,C-p,D-r

Answer»


Solution :A. REFER to Solved Problem
B. Refer to Solved Problem
C. Enthalpy of neutralization`NH_(4)OH` with HCl`= 51.5 kJ mol^(-1)=51500 J mol^(-1)`
500mLof 0.1 M `NH_94)OH =500 XX 0.1` millimoles`=50` millimole`= 0.05` mole
`:. `Enthalpy of neutralisation.
`=51500 xx 0.05 J = 2575J`.
D. Enthalpy of neutralisation of ACETICACID with NAOH `=55.2 kJ mol^(-1) = 55200 J mol^(-1)`
500mL of 0.1 M NaOh` =500 xx 0.1 ` millimole
`= 50` millimole `= 0.05 ` mole
`:. `Enthalpy ofneutralisation
`=55 200 xx 0.05 J = 2760 J`.
Discussion
24.

{:("Column-I (mixed in equal volumes)" ,, "Column -II (Nature of solution)") , ( "A)" 0.2 M HCN + 0.1 M KOH ,, "P) Strong base"), ("B)" 0.2M HCl + 0.1 M KCN ,, "Q) basic buffer") , ("C)" 0.2 M NH_(3) + 0.1 M HCl ,, "R) acidic buffer"), ("D)" 0.2 M KOH + 0.1 M NH_(4) Cl ,, "S) Strong acid"):}

Answer»


Solution :Incomplete neutralization of WEAK acid
` rArr ` acid buffer
(b)Incomplete neutralization of strong acid
` rArr ` LEFT
( C )Incomplete neutralization of weak base
`rArr ` BASIC buffer
(d)Incomplete neutralization of strong base
`rArr` base left
Discussion
25.

{:("List - I","List - II "),("(mixed in equal volumes)","(Nature of solution)"),((A)0.2 "M HCN" + 0.1 M "KOH", (P)"Strong base"),((B) 0.2 "M HCl" + 0.1 "M KCN", (Q)"basic buffer"),((C)0.2 M NH_(3) + 0.1 M HCl, (R)"acidic buffer"),((D) 0.2 M KOH + 0.1 M NH_(4) Cl,(S)" Strong acid"):}

Answer»


Solution :Incomplete neutralization of weak acid
` rArr ` acid buffer
(b)Incomplete neutralization of STRONG acid
` rArr ` LEFT
( C )Incomplete neutralization of weak BASE
`rArr ` basic buffer
(d)Incomplete neutralization of strong base
`rArr` base left
Discussion
26.

Match the following :{:("(P) Equivalent mass of an organic acid","(i) Depression in freezing point"),("(Q) Equivalent mass of an organic base","(ii) Victor Meyer's method"),("(R ) Molecular mass of a volatile organic solid","(iii) Platinichloride method"),("(S) Molecular mass of a non-volatile organic solid","(iv) Silver salt method"):}

Answer»


SOLUTION :PURIFICATION METHODS.
Discussion
27.

Column-I lists some of Group reagents which give characteristiccolout/precipitate mentioned cations in column-II. Match each entry of column-I with those given in column-II.

Answer»


ANSWER :(a-t);(b-p);(c-q);(d-r)
Discussion
28.

Column-I lists some of elements whose salts impart characteristics colour in oxidising flame in the borax bead test. These are mentioned in column-II. Match each entries from column-I and column-II.

Answer»


ANSWER :(a-t);(b-p);(c-q);(d-r)
Discussion
29.

Column-I lists some of elements whose salts give characteristics colour mentioned in column-II. Match eacy entry of column-I with those given in column-II.

Answer»


ANSWER :(a-s);(b-r);(c-q);(d-p)
Discussion
30.

{:(,"Column I (Gas) ",,"Column II"( "Ratio " gamma=C_(p) //C_(v))),((A),"Ammonia", (p),1.20),((B),"Carbon dioxide",(q),1.30),((C ),"Carbon monoxide ",(r),1.40),((D),"Helium ",(s),1.66):} (a) A-s,B-r,C-q,D-p(b)A-p,B-q,C-r,D-s(c ) A-s,B-q,C-r,D-p(d) A-r,B-s,C-q,D-p

Answer»


SOLUTION :`NH_(3)` (TETRATOMIC ) , `CO_(2)`( teiatomic), CO(diatomic), He( monoatomic).
Discussion
31.

{:("Column I (Defect)", " Column II (Effect)"),("(A) Schottky defect", "(p) Crystal becomes coloured"),("(B) Doping silicon with aluminium" , "(q) n-type semiconductor is formed"),("(C) Doping silicon with arsenic" , "(r) p-type semiconductor is formed "),( "(D) Heating NaCl crystal in presence of sodium vapour" , (s) "Density of the crystal decreases"):}

Answer»

A-s, B-q, C-r, D-p
A-q,B-p, C-r, D-s
A-q,B-s,C-q,D-p
A-s, B-r, C-q, D-p

Answer :b
Discussion
32.

Column I (Ionizationenthalpy inKj mol^(-1))Column II(Electron gainenthalpy in kJ mol^(-1)) {:((A),,2080,,(p)-328 ),((B),,1314,,(q) + 116),(( c),,1402,,(r )-141),((D) ,,1681,,(s ) +31):}

Answer»

<P>`A-q , B-s , C- r , D- p`
` A- q , B- r , C-s , D-p `
`A-p , B-q , C-s , D-r`
`A-r , B- s , C- q , D-p`

SOLUTION :NA
Discussion
33.

{:("Column I (Defect)", " Column II (Efect)"), ("(A) Ferrites" , "(p) Ferromagnetic"),("(B)" CrO_(2) , "(q) Paramagnetic"),("(C) Nitric oxide (NO)" , "(r) Ferrimagnetic"),("(D) Manganese dioxide" (MnO_(2)) , "(s) Antiferromagnetic"):}

Answer»

A-r, B-q, C-p, D-s
A-r, B-s,C-q, D-p
A-r, B-s, C-q, D-p
A-s,B-p, C-r, D-q

ANSWER :d
Discussion
34.

{:("Column I (Crystal)" , "Column II (Crystal system)"),("(A)" "CuSO"_(4).5 H_(2)O, "(p) Hexagonal"),("(B)" Na_(2)SO_(4).10 H_(2)O, "(q) Cubic"),("(C) Dimaond" , "(r) Monoclinic"),(" (D) Graphite" , "(s) Triclinic"):}

Answer»

A-r,B-s, C-p, D-q
A-s, B-r, C-q, D-p
A-r,B-p , C-q , D-s
A-p , B-q , C-r , D-s

ANSWER :d
Discussion
35.

{:("Column" (I) , "Column"(II)), ((a) "Presence of halogen" , P. HNO_(3)//AgNO_(3)), ((b) "Presence of sulphur", Q. Na_(2)[Fe(CN)_(5)NO]) , ((c) "Presence of nitrogen" , R. Co(NO_(3))_(2)), ((d) "Presence of"P "and" S , S. FeCl_(3)):}

Answer»

<P>

Answer :(a) `to P""(B) TOQ ; "" (c) to S ; "" (d) to R `
Discussion
36.

{:("Column-I", "Column-II"),((A)"Boron ",(P)"Vacant orbital in valency shell "),((B)"Phosphorus ",(Q)"Unpaired electron in valency shell "),((C)"Iron ",(R)"Non-metallic properties "),((D)"Calcium",(S)"No unpaired electron "),("",(T)X_(2)O_(3)"type (empirical ratio) oxide formation"):}

Answer»


ANSWER :A-PQRT; B-PQRT; C-PQT; D-PS
Discussion
37.

Match the molecular species in Column-I and their magnetic and molecular orbital properties in Column-II : {:("Column-I","Column-II"),((A)O_(2),(P)"Bond order = 2 "),((B) N_(2),(Q)"Oiamagnetic "),((C)H_(2),(R)"Bond order= 3"),((D)O_(2)^(2-),(S) "Paramagnetic"):}

Answer»


ANSWER :A-PQRS; B-QRS; C-PR; D-PQS
Discussion
38.

{:("List-I"," ""List-II"),((A)SiF_(4),P."Lewis acid"),((B)CO_(2),Q."Lewis base"),((C) SO_(2),R."Bronstead acid"),((D)NH_(3),S."Bronstead base"):}

Answer»


Solution :` SiF_4` has vacant d- ORBITALS but cannot add or give `H^(+) `
` CO_2 ` cannot add or give ` H^(+) `
` SO_2`has lone PAIR
` NH_3 ` can give and TAKE `H^(+) `and has lone pair
Discussion
39.

Column-I Column-II (i) Critical temperature (a) Boiling point (ii) Vapour pressure (b) Spherical shape of water droplet (iii) Viscosity (c ) Liquefaction of gases (iv) Surface tension (d) Flow of liquids.

Answer»


ANSWER :`I-C,II-A,III-D,IV-B`
Discussion
40.

Column-I Column-II (i) Boyle's Law (a) V alpha n at constnt T & P (ii) Charle's Law (b) P_(" total ")=p_1+p_2+p_3+"………." at constant T & V (iii) Dalton's Law (c ) V alpha T at constant n & p (iv) Avogadro Law (d) p alpha 1"/"V at constant n & P

Answer»


ANSWER :`I-D,II-C,III-B,IV-A`
Discussion
41.

Match the Column-I with Column-II : {:("List-I", " " "List-II"),((A)CuSO_(4),P."Cationic interaction"),((B)Na_(2)CO_(3),Q."Anionic interaction"),((C)FeCI_(3),R.pH gt 7),((D) K_(2)SO_(4),S. "pH" lt7),(,T."No hydrolysis of ions"):}

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Solution :`Cu^(2+)` gets HYDROLYSIS `rArr ` acid solution`rArr pH LT 7`
` CO_3^(2-) ` get hydrolysis `rArr ` BASIC solution `rArr pH gt 7`
` Fe^(+3) ` gets hydrolysis `rArr` acid solution `rArr pH lt 7`
` K^(+)and SO_4^(2-) `dont get HYDROLYSED
Discussion
42.

{:("Column-I", ""Column-II), ("(Reaction intermediate)", "(Electronic configuration and valence state)"),("A) Carbocation", "P) Sextet and bivalent"), ("B) Carbanion", "Q) Sextet and trivalent"), ("C) Free radicals", "R) Octet and trivalent"), ("D) Carbene", "S) Heptet and trivalent"):}

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SOLUTION :
Discussion
43.

{:("Column" (I) , "Column" (II)) , ((a) Ph-overset(O)overset(||)(C)-CH_(3) , P. "Aldol condensation"), ((b) CH_(3)-overset(O)overset(||)(C)-H , Q. "Positive iodoform test"), ((c) Ph-overset(O)overset(||)(C)-H , R. "Negative test of Fehling's solution"), ((d) CH_(3)CH_(2)OH , S. "Oxidation with" Cu//Delta):}

Answer»

<P>

Answer :(a) `to P , Q , R ""(b) to P , Q ; "" (c) to R ; "" (d) to Q , S `
Discussion
44.

{:(,,"Column I ",,"Column II "),((A) ,,"Noble gas ",,(p) [Xe] 5d^(1) 6s^(2) ),((B) ,,"Representiative elemetn ",,(q) [Rn] 6d^(2) 7s^(2)),((C ),,"Transition element ",,(r ) 1s^(2)),(( D) ,,"Inner transitionelement ",,( s) [Kr] 5s^(2) ):}

Answer»

`A-R , B - s, C- p , D- Q`
`A-r , B-s , C- p : D- p `
`A-s , B-r , C- p , D- q`
`A- s , B- p, C- r , D- q`

Solution :NA
Discussion
45.

{:("Column-I ","Column-II "),("A) Low pressure ","P)" Z=1 ),("B) High pressure ","Q) "Z != 1 ),("C) Very high temperature ","R) "Pb < a/V ),("D) Very low pressure ","S) "Pb > a/V):}

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Solution :Low `P, Z < 1 implies ` attractive force DOMINATE
high `P , Z > 1 implies` REPULSIVE force dominate
high `T implies V to OO implies ` idal gas `implies Z = 1`.
very low `P implies V to 00 implies Z = 1.`
Discussion
46.

{:("Column-I"," Column-II "),("A) If temperature of given gas is increased ","P) Average speed of gas molecules will increase "),("B) If the pressure of the given gas increased ","Q) Root mean square speed of gas molecule "),("at constant temperature ","will increase "),("C) If the density of a given gas is lowered ","R) Most probable speed of gas molecule will "),("at constant temperature ","increase "),("D) If the volume of a given gas is increased ","S) Speed of gas molecules will not change "),("at constant temperature ",):}

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SOLUTION :a) `T UARR` all velocities `uarr`
b,C,d) at constant T velocities don.t CHANGE.
Discussion
47.

{:("Column-I ","Column-II "),("A) Hydrogen gas (P = 200 atm, T = 273K) ","P) Compressibility factor "!= 1 ),("B) Hydrogen gas "(P ~~ 0,T = 273K) ,"Q) Attractive forces are dominant "),("C)" CO_2 (P= 1 atm, T = 273K) ,"R)" PV = nRT ),("D) Real gas with very large molar volume ","S)" P(V - nb) = nRT ):}

Answer»

Solution :a) `H_2` high `P implies Z > 1 implies ` rep. dominate and
`Z = 1 + (Pb)/(RT)`
b) `H_2` at `P = 0 implies Z = 1`
c) `CO_2` at low `P implies Z < 1 implies` at FORCE dominate
`d) V PROP oo implies Z to 1`.
Discussion
48.

{:(,"ColumnI ","Column II "),("(A)" ,"He, Ne , Ar","(p) Representativeelements"),("( B)" ,"Fr, Ra, Ar","(q) Lanthanoids "),("(c )" ,"Ce, Gd, Yb","( r)Noble gases "),("(D)" ,"Rb, Ga, C1","(s )Radioactive elements "):}

Answer»

<P>`A-s , B- p , C-q , D- r`
`A-q , B-s , C- r , D- p`
`A- r , B- s , C-p , D- q`
`A- r , B- p , C- r , D- q`

SOLUTION :NA
Discussion
49.

{:("Column-I", "Column-II"), ("A) "CH_(3)^(+), "P) Electrically neutral"), ("B) "CH_(3)^(-), "Q) having "6e^(-)"in the outer shell"), ("C) "CH_(3)^(*), "R) "sp_(2)), ("D) ":CH_(2), "S) "sp^(3)):}

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SOLUTION :`CH_3^(+) ` - `6e^(-)` in the OUTER shell , `SP^(2)`
` CH_3^(-) ` - `sp^(3)`
`CH_3^(*)` - Electrically NEUTRAL , `sp^(3)`
`:CH_2 ` - Electrically neutral, `6e^(-)` in the outer shell , `sp^(2)`
Discussion
50.

{:("Column-I", "Column-II"), ( "A) "CH_(2)=CH-Cl, "P) +I effect"), ("B) "CH_(3)-CH=CH-O-CH_(3), "Q) -I effect"), ("C) "CH_(3)CH_(2)CH_(2)-Cl, "R) Hyperconjugation"), ("D) "CH_(3)-CH_(2)-CH_(2)-CH_(3), "S) Resonance"):}

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Solution : VINYL chloride --I EFFECT, resonance
Methoxy propene - +1, -I, hyperconjugation, Resonance
PROPYL chloride - -I effect
BUTANE - +I effect
Discussion