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.

Consider the following statements and arrange in the order of true/false as given in the codes. S_1:Na_2O_2ltMgOltZnOltP_4O_(10):Acidic property. S_2:NaltSigtMgltAl:First ionisation energy. S_3:FgtClgtBr:Electron affinity.

Answer»

TTT
TTF
TFF
TFT

Solution :`S_1:Na_2O_2ltMgOltZnOlt P_4O_10`: as non-metallic character increases the acidic character increases `MgO,Na_2O` are basic: ZnO AMPHOTERIC and `P_4O_10` acidic.
`S_2:NaltSigtAlltMg:Mg` has higher than Na DUE to small size and higher nuclear charge .Mg has highest than Al because of `ns^2` configuration (has extra stability and high electron penetration power of s-subshell electrons) and Si has highest than Al because of higher nuclear charge and small size.`IE_1 :Na=496,Al=577,Mg=737 and Si=786` kJ/mole
`S_3:`There is more interelectronic REPULSION in 2p-subshell of fluorine than CHLORINE (3p), So extra electron will be ADDED easily in 3p-subshell of chlorine as compared to 2p-subshell of fluorine.Down the group electron affinity values generally decreases with increasing atomic number due to increase in atomic size.
So`ClgtFgtBr`
Discussion
2.

Consider the following statements and arrange in the order of true/false as given in the codes. S_1:Interstitial compounds have high melting points, higher than those of pure metals. S_2:Permagnate titrations in presence of hydrochloric acid are unsatisfactory. S_3:KMnO_4 does not act an oxidising agent in strong alkaline medium. S_4:For 1^(st) transition serise, the E^() value for M^(2+)//M indicate a decreasing tendency to form cation across theseries.

Answer»


SOLUTION :`S_1`:DUE to strong interatomic forces.
`S_2`:Hydrochloric acid is oxidised to CHLORINE.
`S_3`:`MnO_4^(-)overset(OH^-)toMnO_4^(2-)`
`S_4:M^(2+)//M (E^(theta)//V)`-negative VALUE decreases ACROSS the series.
Discussion
3.

Consider the following statements and arrange in the order of true/false as given in the codes. S_1:Like CO_3^(2-),SO_3^(2-) ions also give test with baryle water , Ba(OH)_2. S_2:Ag_2SO_3 is insoluble in dilute HNO_3 S_3:Triodide ions (l_3^(-)) produced by the reaction of Cu^(2+) and Kl solution are not reduced by excess of sodium thiosulphate solution. S_4:Black precipitate of Cu(SCN)_2 turns into white precipitate when it reacts with saturated solution of SO_2 in water.

Answer»

F T T F
TF F T
F T F T
T T F T

Solution :`S_1:SO_3^(2-)+Ba^(2+)toBaSO_3darr`(WHITE) , `CO_3^(2-)+Ba^(2+)toBaCO_3darr`(white)
`S_2:Ag_2SO_3+H^(+)TO2AG^(+)+SO_2+H_2O`
`S_3:2 Cu^(2+)+5 I^(-)toCu L darr+l_3^(-)(l_2+l^-)`
`I_3^(-)+2S_2O_3^(2-)to3I^(-)+S_4O_6^(2-)`
`S_4:2 Cu(SCN)_2darr + SO_2 + 2 H_2O to 2Cu(SCN)darr`(white)+`2SCN^(-)+SO_4^(2-)`
Discussion
4.

Consider the following statements and arrange in the order of true/false as given in the codes. S_1:In the aluminothermite process, aluminium acts as a reducing agent. S_2:The process of extraction of gold involves the formation of [Au(CN)_4] and [Zn(CN)_4]^(2-) S_3:In the extractive metallurgy of zinc, partial fusion of ZnO with coke is called sintering and reduction of ore to the molten metal is called smelling.

Answer»

T F F
TTT
TTF
TFT

Solution :`S_1:Cr_2O_3+2Altooverset(+3)(Al_2)O_3+2Cr`
`S_2:2Au+4CN^(-)+2H_2O+1/2O_2to2[Au(CN)_2]^(-)to2OH^(-),2[Au(CN)_2]^(-)+ZN=[Zn(CN)_4]^(2-)+2Au`
`S_3`:TRUE STATEMENT
Discussion
5.

Consider the following statements and arrange in the order of true /false as given in the codes. S_1:In I Cl_2^(-), CIF_3 and TeCl_4 the number of lone pairs of electrons on central atoms are 3,2 and 1 respectively. S_2:Amongest NO, C_2, O_2^(-) , He_2^+, the increasing order of bond dissociation energies of He_2^+ lt O_2^(-) lt C_2 lt NO. S_3:Amongst CO, CO_2, CO_3^(2-),CH_3OH, the correct order from the weakest to the strongest carbon - oxygen bond is CH_3OH lt CO_3^(2-) lt CO_2 lt CO S_4:The hybridisation of boron in Cl_2BBCl_2 is the same which nitrogen has in CINO molecules.

Answer»

T T TT
T T TF
T F T F
F T T F

Solution :(A)`S_1`:
`S_2`:`He_2^+` bond order =`(2-1)/2=1/2 ,O_2^(-)` bond order =`(10-7)/2=1.5`
`C_2` bond order =`(8-4)/2=2`, NO bond order =`(10-5)/2=2.5`
Bond order `PROP` bond dissociation ENERGY
`S_3:C-O =1.43Å , C=O 1.23 Å , C-=O 1.09 Å`
`CO:Coverset to = O`, partial triple bond character , bond length is inter mediate of C=O and C= O bonds `CO_2`, O=C=O , double bond length

`CH_3OH, H-undersetunderset(H)(|)oversetoverset(H)(|)C-O-H` , single bond length .
`S_4`:
Discussion
6.

Consider the following statements and arrange in the order of true/false as given in the codes. S_1:In modern periodic table each block contains a number of columns equal to the number of electrons that can occupy that sub-shell S_2:The greatest increase in ionization enthalpy is experienced on removal of electron from core noble gas configuration S_3 :The size of the isoelectronic species is effected by eletron-electron interaction in the outer orbitals S_4:Any thing that influences the valence electrons will affect the chemistry of the element and the valence shell is not affected by nuclear mass.

Answer»

FFTT
TTFT
FTFT
TTTT

Solution :`S_3`:The SIZE of the isoelectronic SPECIES is not EFFECTED by electron-electron inter action in the outer orbitals but is effected by the NUCLEAR CHARGE.
`S_1,S_2 and S_4` are correct statements.
Discussion
7.

Consider the following statements and arrange in the order of true/false as given in the codes. S_1:In AB_2L_2 type, the BAB bond angle will be always greater than normal tetrahedral. S_2:Maleic acid has higher Ka_1 value than fumaric acid due to intramolecular hydrogen bonding. S_3:In CIO_3^(-), NH_3 and XeO_3, the hybridsation and the number of lone pairs on central atoms are same.

Answer»

T T T
FTF
F T T
FFT

Solution :`S_1:OF_2lt109.5^@ and Obr_2 gt 109.5^@`
`OF_2` (appx.`102^@`):Fluorine being more electronegative attracts the bond pairs of electrons towards itself and THUS there is more lp-lp repulsion decreasing the bond angle.
`Obr_2`(appx.`113^@`):The bond pairs are close to more electronegative oxygen ATOM and thus there is repulsion because bp-bp increasing the bond angle.The bulkier Br atoms also create STERIC repulsion which also increase bond angle.
`S_2`:Anion of maleic acid (cis-form) gets stablised through intermolecular HYDROGEN bonding after giving one protons as given in following structure.In furmaric acid (trans-form) no such intramolecular H-bonding is possible.
Discussion
8.

Consider the following statements and arrange in the order of true/false as given in the codes. S_1:From solution containing coppe (+2) and zinc )(+2) ions, copper can be selectively precipitated using sodium sulphide. S_2:Amongst Ca^(2+),Al^(3+),Bi^(3+), and Mg^(2+) the NH_4Cl and aqueous ammonia will precipitate only Al^(3+) as its hydroxide. S_3:Sodium chloride on reaction with conc. H_2SO_4 in presence of MnO_2 liberates a greenish yellow gas. S_4:The formation of brown precipitate on reaction with alkaline K_2[HgI_4] indicates the presence of NH_4^(+)

Answer»

T T T T
T F T T
F F T T
F T F T

Solution :`S_1`:In aqueous medium of SODIUM sulphide, both `Cu^(2+) and Zn^(2+)` will precipitate as their sulphides.Concentration of `S^(2-)` ions provided by the IONIZATION of `Na_2S` in aqueous solution is sufficient to precipitate both the ions.
`S_2`:`Ca^(2+)` and `Mg^(2+)` will not precipitate as `K_(sp)` of their hydroxides are very high.
`BI^(3+)+3(OH^-)toBi(OH)_3 darr` (White)
`Al^(3+)+3(OH^-)toAl(OH)_3darr` (white)
`S_3:2Cl^(-)+MnO_2+H_2SO_4 +2H^(+)toMn^(2+)+SO_4^(2-)+2H_2O+Cl_2 UARR` (greenish yellow)
` (##RES_INO_RK_JA_C08_E01_1061_S01.png" width="80%">
Discussion
9.

Consider the following statements and arrange in the order of true/false as given in the codes. S_(1):Cuprite, Limonite and Zincite are oxide ares S_(2) Magnesite and carnallite are magnesium ores S_(3): Chalcocyte and azurite are ores of copper S_(4) Feldspar an mica minerals contain aluminium.

Answer»

TTTT
FTFF
FFTT
TTFT

Answer :a
Discussion
10.

Consider the following statements and arrange in the order of true/false as given in the codes. S_1:Ammonia chloride on heating with an aqueous solution of K_2Cr_2O_7 and concentrated H_2SO_4 produces deep red vapours. S_2:Deep red solution of ferric acetate on boiling with water turns to a brownish red solution. S_3:NaNO_2 solution acidified with acetic acid produces blue colour with a starch paste contaminated , with iodide ion.

Answer»

T T F
F F T
T F F
F T T

Solution :`S_1:CrO_2Cl_2` reacts with WATER forming `H_2CrO_4` and thus prevents the evolution of deep red vapours.
`CrO_2Cl_2 + 2H_2O to H_2CrO_4 + 2HCl`
`S_2:(CH_3COO)_3Fe+H_2OtoFe(OH)_2(CH_3COO)darr`(brownish red ) +`2CH_3COOH`
`S_3:NO_2^(-)+3I^(-)+4CH_3COOH to I_3^(-)+2NOuarr +4CH_3COO^(-)+2H_2O`
`I_2`+starch `to` WHITE starch paste turns blue .
Discussion
11.

Consider the following statements and arrange in the order of true/false as given in the codes . S_1:Concentrated solution of an alkali metal in liquid ammonia is diamagnetic. S_2:Increasing stability of the peroxide and super oxide of alkaline earth metal down the group is due to the stabilisation of large anions by large cations through lattice energy effects. S_3:In the vapour phase BeCl_2 tends to form a chloro-bridged dimer. S_4:Beryllium hydroxide reacts with acid and alkali both to form [Be(OH_2)_4]Cl_2 and [Be(OH)_4]^(2-) respectively.

Answer»

T T T T
F F FF
T F T F
F TF T

Solution :`S_1`:In concentrated solution UNPAIRED electrons pair up TOGETHER and become dimagnetic
`S_2 and S_3` are correct STATEMENTS.
`S_4:Be(OH)_2+2OH^(-)to[Be(OH)_4]^(2-)` beryliate ION
`Be(OH)_2 + 2HCl+2H_2Oto[Be(OH_2)_4]Cl_2`
Discussion
12.

Consider the following statements and arrange in the order of true/false as given in the codes . S_1:Colour of a colloidal solution depends upon the size and shape of sol particles. S_2:Bromnian motion is due to continuous bombardment of sol particles by molecules of disperson medium. S_3:When negatively charged smoke comes in contact with positively charged clouds.rain fall takes place. S_4:For a positive sol, flocculation values are in the order. NaClgtK_2SO_4gtNa_3PO_4gtK_4[Fe(CN)_6]

Answer»

TTTT
TTFF
TFTF
FFFF

Solution :`S_1`:DIFFERENT sized colloidal particles have different colour.
`S_2`:Brownian movement is due to collision between D.P. particles and D.M. particles
`S_3`:It is because of coagulation of mist particle in air
`S_4`:FLOCCULATION VALUE `prop 1/("Charge on effective ion")`
Discussion
13.

Consider the following statements and arrange in the order of true/false as given in the codes. S_1:Ammonia on heating with concentrated solution of sodium hypochlorite gives nitrogen gas. S_2:The phosphine gas dissolves in water in presence of sunlight and produces phosphonium hydroxide like ammonium hydroxide. S_3:Barium azide on heating gives pure nitrogen gas. S_4:The oxo-acids of phosphorus in which phosphorus has lower oxidation state less than +5 contain either P-P or P-H bonds but not both in addition to P=O and P-OH bonds.

Answer»

TFTT
FFTT
TTTF
TFTF

Solution :`S_1-N_2H_4` is formed in aqueous DILUTE solution in presence of GLUE and gelatin and in concentrated solution yields `N_2`
`S_2-PH_3` solution in WATER EXPLODES forming red phosphrous and `H_2`
`S_3-Ba(N_3)_2overset(DELTA)toBa+3N_2 uarr`
Discussion
14.

Consider the following statements and arrange in the order of true/false as given in the codes. S_1: One type of units cells are possible for the crystallaographic dimensions as a=b ne c and alpha=beta=gamma=90^@. S_2: In the configuration shonw the size of the smallest circle is (2/sqrt3-1) times the size of the biggest circles. S_3:Number of next neighbours of Cs^+ ion in CsCl structure is 6 Cs^+ ions S_4: A crystal has A ions at the cube corners and B ions at the edge centres.The coordination number of A and B are respectively 6 and 2

Answer»

TTTT
FFTT
FTFT
FFFF

Solution :`S_1`:For the crystallaographic dimensions as `a=bnec` and `alpha=beta=gamma=90^@` simple & Body centered unit cells are possible.
`S_2`:Acc. To the diagram two DIFFERENT triangles can be observed
`Rto` radius of BIGGEST circle
`r_(1)to` radius of smaller circle
`r to` radius of smallest circle


Using pythagoras
`R^2 +r^2 +2Rr=R^2+R^2(4+2-4sqrt2)+r^2-2(2sqrt2)Rr`
`R+2r=R+R(6-4sqrt2)-(4-2sqrt2)r`
`(6-2sqrt2)r=R(6-4sqrt2)r/R=(6-4sqrt2)/(6-2sqrt2)`
Size RATIO `=r^2/R^2=((6-4sqrt2)/(6-2sqrt2))^2`
For point a (`Cs^(+)` ion) we have number of next neighbours of `Cs^(+)` ion in CsCl structure is `6Cs^(+)` ions, i.e. 1a,A2,a3,a4,a5,a6
`S_4:("C.N. of cation")/("C.N. of anion")=("charge of cation")/("charge of anion")=3/1=3`
Now Xo-ordination no of A is shown so of B is 2.

Discussion
15.

Consider the following statements and arrange in the order of true/false as given in the codes. ltBRgt S_(1): In the aluminothermite process, aluminium acts as reducing agent. S_(2): Amongst the following metals Mg and Al can not be obtained by the electrolysis of the aqueous solution of their salt. (I) Ag (II) Mg (III) Cu (IV) Al S_(3): In teh extractive metallurgy of zinc, partial fusion of ZnO with coke is called sintering and reduction of ore to the molten metal is called smelting. S_(4): Extractive metallurgyu of silver from its ore argentite involves complex formation and displacement by more electropsitive metal.

Answer»

TFFT
TTTT
TTFT
TFTF

Answer :B
Discussion
16.

Consider the following statements and arrange in the order of the true/false as given in the codes. S_1:The IUPAC name of the compound [Cr(NH_3)_5(NCS)][ZnCl_4] is pentaamminethiocyanato-N-chromate(III) tetrachlorozincate (II). S_2:CoSO_4 is paramagnetic and coloured. S_3:[Co(NH_3)_4 (NO_2)_2 NO_3 shows ionisation, linkage and geometrical isomerism. S_4:The C-O bond length in the complex [Fe(CO)_5] is same as that found in carbon monoxide itself.

Answer»

F T T F
T T T T
F T T F
T T T F

Solution :`S_1`:Pentaamminethiocyanato-N-chromium(III) TETRACHLOROZINCATE (II).
or
Pentaammineisothiocyanatochromium(III) tetrachlorozincate (II).
`S_2`: In `CoSO_4`, the oxidation state of Co is +2 i.e. `[Ar]^18 3d^7 4s^0` electrons configurations. It has two unpaired electrons so it is paramangetic and coloured.
`S_3:[Co(NH_3)_4(NO_2)_2]NO_3 & [Co(NH_3)_4(NO_2)(NO_3)]NO_2` show ionisation ISOMERISM
`[Co(NH_3)_4(NO_2)_2]NO_3 & [Co(NH_3)_4(NO_2)(ONO)]NO_3` show linkage isomerism
This complex has cis- and trans isomers and the total isomers are 10.
`S_4`:The bond length C-O in CO itself is 1.128, while the bond length in `[Fe(CO)_6]` molecules are 1.15Å on account of synergic INTERACTION between Fe and CO.
Discussion
17.

Consider the following statements and arrange in order of true/false as given in the codes. S_1:The reaction 2H_2O_2to2H_2O+O_2 is not an example of a redox reaction. S_2:The equivalent mass of K_2Cr_2O_7 in acidic medium is molar mass divided by two. S_3: The equivalent mass of a substances can be calcualted without considering the reaction it undergoes.

Answer»

TFT
FTF
FFF
TTT

Solution :`S_1`:It is disproportionation REACTION
`S_2`:It is `("mol. WT.")/6`
`S_3`:For calculation of VALENCY factor reactant product should be KNOWN .
Discussion
18.

Consider the following statements and arrange in order of true/false as given in the codes. S_1: Vapour pressure is a colligative property. S_2:Freezing point of a solution is always lower than of the pure solvent S_3: Acetic acid undergoes association in benzene The molar mass of acetic acid, determined by elevation of boiling point is always higher than its normal molar mass. S_4: Osomotic pressure measurements can be used for determination of molar mass of polymers.

Answer»

FFFF
FTTT
TTTT
TFTF

Solution :`S_1:(DeltaP)/P` is a colligative property.
`S_2:`Entropy of solution is more than entropy of pure SOLVENT
`S_3`:DUE to association molar mass increases
`S_4`:LARGER value of osmotic pressure is EASILY measurable
Discussion
19.

Consider the following statements about monosaccharides They are optical active compound except dihydroxy acetone fructose is ketose sugar but it is reducing sugar glucose and fructose are functional isomers fructose and glucose have some molecules formula Among the above correct statements is/are

Answer»

1 and 2
2 and 3
3 and 4
1,2,3 and 4

Answer :D
Discussion
20.

Consider the following statements about transition metals.

Answer»

Only I
Only II
Both I and II
None of these

SOLUTION :The transition METALS are very much hard and have LOW volatility. Their MELTING and boiling are high which are attributed to the involvement of greater number of electrons from(n-1) d in ADDITION to the ns electrons in the interatomic metallic bonding.
Discussion
21.

Consider the following statements about proteins 1) All natural amino acids which constituents of proteins are L -amino acids 2) glycine is optically active . 3) a -amino acids are connected by ester lmkage 4) Myosin is structural protein Among these statements

Answer»

only 1 and 4 are CORRECT
only 2 and 3 are correct
only 3 and 4 are correct
only 4 is correct

Answer :A
Discussion
22.

Consider the following statements: (a) The pH of a mixture containing 400 mL of 0.1 MH_(2)SO_(4) and 400 mL of 0.1 M NaOH will be approximately 1.3. (b) Ionic product of water is termperature dependent. ( c) A monobasic acid with K_(a) = 10^(-5) has a pH =5. The degree of dissociation of this acid is 50% (d) The Le Chatelier's principle is not applicable to common-ion effect.

Answer»

a and b
a,b and c
b and c
a,b and d

Solution :`underset("40 m mol excess")(H_(2)SO_(4)) + underset("40 m mol limiting reagent")(2NaOH) to Na_(2)SO_(4) + 2H_(2)O`
After reaction
`"20 m mol020 m mol40 m mol"`
Total VOLUME = 400+400 = 800 mmol
Number of moles of `H_(2)SO_(4)=20` m mol
Number of moles of `H^(+)` ion = `2 xx 20` m mol = 40 m mol
`[H^(+)] = 40/800 = 0.05` M
`pH=-logH^(+)] =-log(0.05) =2-log 5=2-0.7 = 1.3`
pH=1.3
(B) `K_(omega) = [H^(+)][OH^(-)]`
As T increases, `K_(omega)` also increases
(c ) pH=5 and `K_(4)=10^(-5)`
`rArr -log[H^(+)]=5`
`[H^(+)]=10^(-5)`
Weak monobasic acid 'HA' having concentration 'C'
`{:(,HA(aq), H^(+)(aq)+,A^(-1)(aq)),("At t=0",C,0,0),("At equilibrium",C-Calpha,Calpha,Calpha):}`
`K_(a) =([H^(+)][A^(-1)])/([HA]) =(Calpha)/(C(1-alpha))`
`alpha to` DEGREE of dissociation
`THEREFORE K_(a) = (Calpha^(2))/(1-alpha) = 10^(-5)`...........(1) (given)
`[H^(+)]= Calpha = 10^(-5)`.............(2)
From EQUATION (1) & (2)
`alpha/(1-alpha)=1 rArr alpha=1-alpha`
`alpha = 1/2`
`% alpha = 1/2 xx 100 = 50%`
Discussion
23.

Consider the following statementsA) On reaction with Grignard reagent followed by hydrolysis acetone gives tertiary alcohol B) Mesitylene is a polymer of acetone C) Chloroform gives chloretone on reaction with acetone D) Acetone ammonia is an addition product of acetone with NH_3

Answer»

All are CORRECT
A is correct
A,B and C are correct
A and D are correct

Answer :C
Discussion
24.

Consider the following statements:- (a) At high pressure all real gases have Z > 1 whileat moderate pressure most gases have Z < 1 (b) Vanderwaal constant 'a' is measure of attractiveforce within the gas and is independent oftemperature and pressure. (c )Greater the critical temperature of a gas moreeasily it will be liquified.(d) There is no force of attraction betweenmolecules of ideal gas. The correct statements are :

Answer»

Only B, C, d
Only a, c, d
Only c, d
All a, b, c, d

ANSWER :D
Discussion
25.

Consider the following statements 1.Soap cannot be used in acidic water. 2. ionic part of a soap is -COO^(-).Na^(+) 3. soap dissolves in water faster then detergent. Which of the statements given above is/are correct ?

Answer»

1 and 2 only
2 and 3 only
3 only
1 only

Solution :Detergent DISSOLVES in water FASTER than soap.
Discussion
26.

Consider the following statements : 1. Maximum covalency of carbon is 4, whereas maximum covalency of silicon is 6. 2. The maximum covalency of an element is limited to 6. Which of the statements given above is/are correct ?

Answer»

1 only
2 only
Both 1 and 2
Neither 1 nor 2

Solution :Carbon and Silicon both is belongs to Ivth group and carbon have maximumvalency of 4.
C : 2, 4
Si : 2,8, 4
But Si have vacant d-orbitals and can be used to ACCOMMODATE more ELECTRONS. Thus, the MAXIMUM covalency of Si can be 6.
Discussion
27.

Consider the following statements (1) The basic strength of hydroxides of lanthanides decreases from La(OH)_3 " to " Lu(OH))_3 (2) The lanthanoid ion Lu^(3+) Yb^(2+) and Ce^(4+) are diamagnetic (3) The corret order of ionic radii of Ce^(3+) , La^(3+) Pm^(3+) and Yb^(3+) is Yb^(3+) lt Pm^(3+) lt La^(3+) lt Ce^(3+) Which of the statemnets given above is / are correct ?

Answer»

1 only
1,2 only
1,2 and 3
None to these

Solution :`Lu = [XE] 4f^(14) 5d^(1)6s^(2)`
`YB = [Xe] 4f^(14) 5d^(0) 6s^(2)`
`Ce = [Xe] 4f^(1)5d^(1) 6s^(2)`
Discussion
28.

Consider the following statements 1. Cs^+ ion is more highly hydrated than other alkali metal ions 2. Among the alkali metals Li, Na , Kand Rb, Lithium (Li) has the highest melting point 3. Among the alkali metals , only lithium form a stable nitride by direct combination . O these statements

Answer»

1,2 and 3 are CORRECT
1 and 2 are correct
1 and 3 are correct
2 and 3 correct

ANSWER :D
Discussion
29.

Consider the following statement: Statement-1:In electrolytic refining, the impurities from th blister copper deposits anodemud which contains antinomy, selenium, telluriun, silver, gold and plantinum. (From copper pyrites) Stament-2: In Serpeck's process, silica is removedby heating the bauxite to 1800^(@)C with coke in a current of N_(2). Statement-3:Chalcocite and azurite are ores of copper. Statement-4:The tin is obatined by the carbon redcution of black tin. and arrange in hte order of true/false.

Answer»

TFTT
FTFF
FFTT
TTTT

Answer :D
Discussion
30.

Consider the following statements 1. Among the fertilizers used, urea contains maximum percentage of N. 2. The mixture of calcium sulphate and calcium dihydrogen phosphate is known as superphosphate of lime 3. Potassium magnesium sulphate is called the muriate of potash which of the statement given above are correct ?

Answer»

1 and 2 only
2 and 3 only
1 and 3 only
1,2 and 3

Solution :Statement (1) and (2) are correct.
Urea CONTAINS MAXIMUM percentage of N among various fertilizers used. The mixture of `Ca(H_(2)PO_(4))_(2)` and `CaSO_4` is sold as ''super PHOSPHATE''. Statement (3) is WRONG. Muriate is obsolate name for chloride e.g KCl.
Discussion
31.

Consider the following statement: Statement-1: Poiling process is used to refinning of copper and lead. Statement-2: The scavenger which is used in the manufacture of steel is maganese. Statement-3: The chemical comosition of mattert in Cu_(2)O+Cu_(2)S. Statement-4: In the extraction of aluminium from aluminia Al_(2)O_(3) undergoes dissociation. And arrange in the order of ture/false

Answer»

FTFF
TTFF
FFTT
TTFT

Answer :A
Discussion
32.

Consider the following statement: Statement-1: Extraction of zinc from sphalerite involves roasting followed by carbon redcution. Statement-2:In bessemer convertor, along with copper FeSiO_(3) is also obtained. Statement-3: In extraction of lead, CaO prevents formation of PbSiO_(3). Statement-4:Copper is extracted by hydrogen metallurgy from low grade ores and scraps. and arrange in the order of true/false.

Answer»

TTTF
FTTF
TTTT
FFFT

Answer :C
Discussion
33.

Consider thefollowingstatement . (i) Vitamin D functions in the adsorption and maintenance of calcium. (ii)Vitamin E act as an antioxidant. (iii)Vitamin C functions in blood clotting. Whichof the abovestatement is / arecorrect ?

Answer»

III only
ii & iii
i&ii
ionly

Answer :C
Discussion
34.

Consider the following statement. (i) The relative arrangement of amino acids in the polypeptide chain called the secondary structure of protein. (ii) alpha -Helixand beta strands are two most common sub structures formed by proteins.(iii) alpha - Helix and beta - -strands further folds to form the three dimensional arrangement in tertiarystructure of proteins. Whichof the abovestatement is / arecorrect ?

Answer»

ionly
i &iii
ii&iii
ii only

ANSWER :B
Discussion
35.

Consider the following statement: Statement-1: In extraction of iron from haematite ore, the reduction reactions take place only in the lower temperature range in the blast furnace. Statement-2:Calamine is an carbonate ore of zinc. ltbr Statement-3: The principle opre of aluminium, bauxite, usually contains silica, iron oxides and titanium, oxide as impurities. Statement-4:Solidified copper obtained from silica lined convertor (Bessemer converter) has blistered appearance due to the evolution of SO_(2) and arrange in the order of true/false.

Answer»

FTTT
FTFF
FFTT
TFFT

Answer :A
Discussion
36.

Consider the following statement: (I) The radius of an anion is larger than that of the parent atom. (II) the ionization energy generally increases with increasing atomic number in a period. (III) The electronegativity of an element is the tendency of an isolated atom to attract an electron. Which of the above statement is/are correct?

Answer»

I alone
II alone
I and II
II and III

Answer :C
Discussion
37.

Consider the following statement . (i) The amino acids are linked electro valently by peptide bonds in proteins. (ii)Fibrous proteins are linear molecules similar to fibres. (iii) Globular proteins have a linear shape. Which of the abovestatement is / are notcorrect ?

Answer»

III only
i&iii
ii &iii
ii only

ANSWER :B
Discussion
38.

Consider the following statement : (i) Solvent of higher dielectric constant show very low conductance in solution. (ii) Conductance is directly proportional to viscosity of the medium . (iii) Molar conductance of a solution increases with increase in dilution. Which of the above statement is l are correct ?

Answer»

i & ii
ii and iii
iii only
i only

ANSWER :C
Discussion
39.

Consider the followingstatement . (i)Ribsomers are thesitesat whichportein synthesis takes place . (ii) MessengerRNA carriedgenetic informationfrom DNAto theribosomes for protein synthesis . (iii) t RNA consistof 20-40 nucleotides in a singlechain . Whichof the abovestatement is /arenot correct ?

Answer»

ionly
i & II
III only
ii & iii

ANSWER :C
Discussion
40.

Consider the following statement. (i) Most of the actinoids are coloured. (ii) Actinoids show greater tendency to form complexes. (iii) Most of the actinoids are non-radioactive. Which of the above statements is/ are correct.

Answer»

i only
i and iii
i and II
ii and iii

Solution :i and ii
Discussion
41.

Consider the following statement . (i) Nucleicacidare biopolymers of nucleotides . (ii) Controlledhydrolysis of DNAand RNA yield 3 componentsnamelya nitrogeneous base ,a pentose sugarand sulphate group . (iii ) DNA and RNA are themolecularrepositories that carry geneticinformationin everyorganism . Whichof the abovestatement is / are correct ?

Answer»

ionly
II only
I & iii
ii &iii

Answer :C
Discussion
42.

Consider the following statement (i) La(OH)_(3) is the least basic among hydroxides of lanthanides. (ii) Zr^(4+) and Hf^(4+) posses almost the same ionic radii. (iii) Ce^(4+) can act as an oxidizing agent. Which of the above is/are true?

Answer»

(i) and (iii)
(ii) and (iii)
(ii) only
(i) and (ii)

Solution :As a result of lanthanide CONTRACTION `Zr^(4+)` and `Hf^(4+)` possess almost the same ionic radii. `Ce^(4+)` is an oxidising agent. `Ce^(4+)` gains electron to acquire more STABLE `Ce^(3+)` STATE. `LA(OH)_(3)` is the most basic among lanthanide hydroxides.
Discussion
43.

Consider the followingstatement . (i) Lipids are theprincipalcomponentsof cellmembranes includingcell walls. (ii) Enzymes are biocatalyststhat catalysesthe hydrolysisof surcoseto fructose and glucose . Whichof the abovestatement is / are correct ?

Answer»

I only
III only
I & II
ii & iii

ANSWER :C
Discussion
44.

Consider the following statement. (i) Lanthanoids do not form oxo cations. (ii) Most of the lanthanoids are colourless. (iii) Binding energy of 4f orbitals are lower Which of the above statement is/ are not correct.

Answer»

i and II
III only
i and iii
i, ii and iii

Solution :iii only
Discussion
45.

Consider the following statement . (i) In ionisation of cyclopropane, if the concentration of cyclopropane is reduced is reduced half , the rate increases twice. (ii) The rate of the reaction depends upon the concentration of the reactant. (iii) Order values must be determined experimentally . Which of the above statement (s) is / are not correct ?

Answer»

(i) only
(II) and (III)
(iii) only
(ii) only

ANSWER :A
Discussion
46.

Consider the following statement: (i) High adsorption is the result of high surface area of the adsorbent. (ii) The process of removing an adsorbed substance is called absorption. (iii) Adsorbed substance is called an adsorbate. Which of the above statement is / are not correct?

Answer»

i & II
ii & III
ii only
iii only

SOLUTION : ii only
Discussion
47.

Consider the followingstatement . (i) Endocrine glandsmake hormones . (ii) Hormonesmay becalssifiedas either protein (or) steroids . (iii) Hormonesare intracellular signallingmolecule . Whichof the abovestatementis / are not correct ?

Answer»

ionly
II & III
iii only
i & iii

ANSWER :D
Discussion
48.

Considerthe following statement . (i) DNA mainlypresentin cytoplasm ,nucleolusand ribosomes . (ii) RNA is stableand not hydrolysed easily by alkalis. (iii) DNAcan replicate itself . Whichof the abovestatements is / are correct ?

Answer»

III only
I only
i & II
ii & iii

ANSWER :C
Discussion
49.

Consider the following statement and arrange in the order of true/false as given in the codes :- (a) [Cr(NH_(3))_(6)][Cr(CN)_(6)] and [Cr(NH_(3))_(4)(CN)_(2)] [Cr(NH_(3))_(2) (CN)_(4)] are coordination isomers:- (b)[Cr(Py)_(2)(H_(2)O)_(2)Cl_(2)]Cl and [Cr(Py)_(2)(H_(2)O)Cl_(3)]H_(2)Oare ionisation isomer (c ) [Pt (NH_(3))_(4)Br_(2)]Cl_(2) and [Pt(NH_(3))_(4)Cl_(2)]Br_(2)are linkage isomers (d) [PtCl_(2)(NH_(3))_(2)] exihibits optical isomerism

Answer»

TTFT
FTFT
TTFF
TFFF

Solution :`[NiCl_(2)(P Ph_(3))_(2)]-sp^(3)-`tetrahedral structure G.I. ABSENT
Discussion
50.

Consider the following statement. (i) All the actinoids are non radioactive. (ii) Neptunium and other heavier elements are produced. by artificial transformation of nature rally occurringelements by nuclearreactions (iii) Most of the actinoids have long half lives. Which of the above statements is/ are not correct.

Answer»

i only
i and ii
ii and III
i and iii

Solution :i and iii
Discussion