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13601.

What is the relationship between (I) & (II)

Answer»

Enantiomer
Diastereomers
Constitutional isomer
Identical molecules

Answer :B
Discussion
13602.

Which of the following oxide is least stable?

Answer»

`CO_2`
CO
MgO
HgO

Answer :D
Discussion
13603.

Write the products formed in the reaction of nitric acid with dilute and concentrated with magnesium.

Answer»

Solution :(i) Magnesium with conc. `HNO_(3)`:
`4Mg+10 HNO_(3)rarr 4Mg(NO_(3))_(2)+NH_(4)NO_(3)+3H_(2)O`
Magnesium reacts with concentrated nitric acid to GIVES both magnesium NITRATE and ammonium nitrate.
(ii) Magnesium with dil. `HNO_(3):`
Magnesium reacts with dilute nitric acid to gives both magnesium nitrate and nitrous OXIDE.
`4Mg+10HNO_(3)rarr 4Mg(NO_(3))_(2)+N_(2)O+5H_(2)O`
Discussion
13604.

Two elements A (at. mass 16) and B (at. mass 14) combine to form compounds X, Y and Z. The ratio of different masses of B which combine with a fixed mass of A in X, Y and Z is 1:3:5. If 32 parts by mass of A combine with 84 parts by mass of B in X, then in Z, 16 parts by mass of A will combine with

Answer»

14 PARTS by mass of B
42 parts by mass of B
70 parts by mass of B
84 parts by mass of B

SOLUTION :70 parts by mass of B
Discussion
13605.

Which of the folowing is not a state function ?

Answer»

Heat
Internal energy
Enthalpy
Entropy.

Answer :A
Discussion
13606.

What is a double salt ? Give an example.

Answer»

Solution :Double salts are those compounds which LOSE their identities in solutions and BREAK down into SIMPLE ions and exist in crystalline state. Example: Double salts like Potash ALUM `(K_2SO_4. AI_2 (SO_4)_3.2H_2O)` in aq. solution break down into `K^+, AI^3+, SO_4`. ions where they lose their identity.
`K_2SO_4.AI_2(SO_4)_3. 24H_2OrarrK^(+)+2AI^(3+)+4SO_4^(=)+24H_2O`
Discussion
13607.

Which relation is true, if molecular weight of solute is x and its weight is y ?

Answer»

`X=((y)/(V))(RT)/(pi)`
`y=((x)/(y))(RT)/(pi)`
`x=((v)/(y))(RT)/(pi)`
`x=((y)/(v))(R pi)/(T)`

ANSWER :A
Discussion
13608.

Which of the following is not a state function

Answer»

Internal energy
Enthalpy
Work
ENTROPY

Solution :Work is not a STATE function as during a process its value depends on the PATH FOLLOWED. The value of enthalpy, internal energy entropy depends on the state and not on the path followed to get that state, HENCE these are state functions.
Discussion
13609.

The sequence of ionic mobilty in the aqueous solution is

Answer»

`K^(+) gt NA^(+) gt Rb^(+) gt Cs^(+)`
`Cs^(+) gt Rb^(+) gt K^(+) gt Na^(+)`
`Rb^(+) gt K^(+)gt Cs^(+) gt Na^(+)`
`Na^(+) gt K^(+) gt Rb^(+ gt Cs^(+ )`

Solution :SMALLER the size of an ion, more strongly it is HYDRATED and less is the ionic mobility. The sizes of the unhydrated ions increase in the ORDER:
`Na^(+) lt K^(+) lt Rb^(+) lt Cs^(+)`
The sizes of the hydrated ions will be in the order:
`Cs^(+) lt Rb^(+) lt K^(+) lt Na^(+) `
Hence, their ionic mobilities will be in the order:
`Cs^(2+) gt Rb^(+) gt K^(+) gt Na^(+)`
Discussion
13610.

Which of the following does not represent functional isomers of each other ?

Answer»

`CH_(3)CH_(2)NO_(2) " and " CH_(3)CH_(2) O - N`
`C_(6)H_(5)CHO " and " CH_(3)COCH_(3)`
`CH_(3)CH_(2) CH_(2)NH_(2) " and " (CH_(3))_(3)N`

Solution :`CH_(3)CH_(2)CH_(2)NH_(2)` and `(CH_(3))_(2)CHNH_(2)` are chain ISOMERS and not functional isomers.
Discussion
13611.

The solubility product of a sparingly soluble salt AB at room temperature is 1.21 xx 10^(-6). Its molar solubility is

Answer»

`1.21 xx 10^(-6)`
`1.21 xx 10^(-3)`
`1.1 xx 10^(-4)`
`1.1 xx 10^(-3)`

SOLUTION :AB is binary electrolyte.
`S = SQRT(K_(sp)) = sqrt(1.2 xx 10^(-6)) = 1.1 xx 10^(-3) M`.
Discussion
13612.

The sulphur molecule (S_8)possesses:

Answer»

CUBICAL structure
Spherical structure
Tetrahedral structure
W SHAPED RING structure

Answer :D
Discussion
13613.

Which of the following is largest

Answer»

`Cl^(-)`
`S^(2-)`
`Na^(+)`
`F^(-)`

Solution :`S^(2-)` and `Cl^(-)` both are ISOELECTRONIC but nuclear charge of `Cl^(-)` is more than `S^(2-)`. So `S^(2-)` has LARGEST SIZE.
Discussion
13614.

The statements regarding oxyacids of phosphorous are i) HPO_(3) molecule is monobasic acid ii) H_(4)P_(2)O_(6) molecule has P - P bond iii) H_(4)P_(2)O_(7) molecule has P - O - P linkage The correct combination is

Answer»

All are correct
Only II is correct
ii & III are correct
i & ii are correct

Answer :A
Discussion
13615.

What are the hybridisation of the carbon atoms labeled C_(1)and C_(2), respectively in glycine ?

Answer»

`{:(C_(1),C_(2)),(SP^(2),sp^(2)):}`
`{:(C_(1),C_(2)),(sp^(2),sp^(3)):}`
`{:(C_(1),C_(2)),(sp^(3),sp^(2)):}`
`{:(C_(1),C_(2)),(sp^(3),sp^(3)):}`

Solution :
Discussion
13616.

Which of the following do not exhibit resonance.

Answer»

`CO_(3)^(-2)`
`ClO_(3)^(-)`
`SiO_(2)`
`SO_(3)^(-2)`

SOLUTION :
No resonance (all SINGLE bond)
Discussion
13617.

Which drug is used for prevention of impregnation ?

Answer»

Mestranol
Terfenadine
Veronal
Aspirin 

ANSWER :A
Discussion
13618.

Which one of the following statement is true for transition elements

Answer»

They exhibit diamagnetism
They exhibit INERT pair effect
They do not FORM ALLOYS
They show variable oxidation states

Solution :They show variable oxidation states DUE to participation of `(n-1)` d-orbitals electrons with NS orbital electrons.
Discussion
13619.

What ratio of Pb^(2+) to Sn^(2+) concentration is needed to reverse the following cell reaction ? Sn(s)+Pb^(2+) (aq.) rarr Sn^(2+) (aq.)+Pb(s) E_(Sn^(2+)//Sn)^(@)=-0.136 volt and E_(Pb^(2+)//Pb)^(@)=-0.126 volt

Answer»


ANSWER :`([PB^(2+)])/([SN^(2+)])=0.458`
Discussion
13620.

Which one of following is more reactive than the rest towards a Lucas reagent ?

Answer»

1-butanol
2-butanol
methanol
2-methyl 2-propanol

Solution :2-methyl 2-propanol is tertiary alcohol, which FORMS tertiary CARBOCATION (most stable carbocation)
`(CH_3)_3C-OH+H^(+) to (CH_3)_3C-O^(+)H_2 to (CH_3)_3C^(+) + H_2O`
`(CH_3)_3C^(+) overset(Cl^-)to (CH_3)_3C-Cl`
Discussion
13621.

The value of Planck's constant is 6.62618 xx 10^(-34) Js . The number of significant figures in it is :

Answer»

six
five
three
thirty-four

ANSWER :A
Discussion
13622.

Wurtz reaction of methyl iodidie yields an organic compound X. which one of the following reactions also yields X

Answer»

`C_(2)H_(5)Cl+Mgoverset("dry ether")to`
`C_(2)H_(5)Cl+LiAlH_(4)to`
`C_(2)H_(5)Cl+C_(5)H_(5)ON ato`
`CHCl_(3)underset(Delta)overset("AG powder")to`

Solution :Wurtz reaction gives ETHANE.
`2CH_(3)I+2Na underset(ether)overset(dry)toC_(2)H_(6)+2NaI`
Similarly `C_(2)H_(5)Cl` reduced by `LiAlH_(4)` to GIVE ethane
`C_(2)H_(5)Cl+2H overset(LiAlH_(4))toC_(2)H_(6)+HCl`
Discussion
13623.

The specific conductivity of an aqueous solution of a weak monoprotic acid is 0.00033 ohm^(-1) cm^(-1) at a concentration 0.02 M. If at this concentration the degree of dissociation is 0.043, then calculate the value of lambda_(0) ("in"ohm^(-1)cm^(2)//eqt):

Answer»

483
438
348
384

Solution :`alpha=0.043=lambda_m/lambda_oo` and`lambda_m=0.00033xx50xx10^3=33xx50xx10^(-2)`
so `lambda_oo=(33xx50xx10^(-2))/0.043 =383.72 ~~384`
Discussion
13624.

Which halide has the highest melting point

Answer»

NaCl
NaBr
NaF
NaI

Answer :C
Discussion
13625.

What are called to drugs which are used to prevent parasite ?

Answer»

Antibacterial
Antifungal
Antiviral
ANTI PARASITIC 

SOLUTION :Anti parasitic
Discussion
13626.

Which one of the following can be classified as Bronsted base?

Answer»

`CH_(3)COOH`
`NH_(4)^(+)`
`NO_(3)^(-)`
`H_(3)O^(+)`

Solution :Bronsted define acids are proton DONOR and bases are proton acceptors
Discussion
13627.

Which of the following amines form N-nitroso derivative when treated with NaNO_(2) and HCl

Answer»

`CH_(3)NH_(2)`


SOLUTION :Secondary AMINES FORM N-nitroso derivatives with nitrous acid.
Discussion
13628.

Which statement of the following is incorrect .

Answer»

Molecularity of a reaction is always a whole number
Order and molecularity of a reaction need not be same
order of reaction MAY be ZERO
Order of a reaction depends upon the MECHANISM of the reaction

Answer :D
Discussion
13629.

There is no test (Direct) for the detection of following in an organic compound:

Answer»

CI
N
S
O

Answer :D
Discussion
13630.

Unpaired electron in CH_3 occupies:

Answer»

sp-HYBRID ORBITAL
`sp^3`-hybrid orbital
p-orbital
`sp^2`-hybrid orbital

Answer :B
Discussion
13631.

Under what reaction conditions (acidic/basic), the coupling reaction of aryldiazonium chloride with aniline is carried out ?

Answer»


ANSWER :The reaction is CARRIED out in mild BASIC conditions.
Discussion
13632.

Which of the following satements is correct ?

Answer»

All AMINO acids are OPTICALLY active
All amino acids except GLYCINE are optically active.
All amino acids except GLUTAMIC acid are optically active
All amino acids except LYSINE are optically active

Answer :B
Discussion
13633.

Which is not true about borax?

Answer»

It is a useful primary standard for titrating against acids
One mole of borax contains 4 `B-O-B` bonds
Aqueous solution of borax can be used as buffer
It is made up of two TRIANGULAR `BO_(3)` UNITS and two TETRAHEDRAL `BO_(4)` units

Answer :B
Discussion
13634.

Write the reactions showing the presence of following in the open structure of glucose : (i) A carbonyl group(ii) Straight chain with six carbon atoms

Answer»

Solution :(a) A carbonyl group
`{:(CHO,,CH=N-OH),(|,,"|"),((CHOH)_(4),overset(NH_(2) OH)to,(CHOH)_(4) ),(|,,"|"),(CH_(2) OH,,underset("GLUCOSE oxime")(CH_2 OH)):}`
(b) Straight chain with six CARBON atoms
`{:(CHO),("|"),((CHOH)_(4)),("|"),(CH_2 OH),():}overset(HI,Delta) (to) CH_3 -CH_2 -underset("n-Hexane") ( CH_2 - CH_2) - CH_3`
Discussion
13635.

Which of the following taking place in the Blast fuenace is endothermic ?

Answer»

`CaCO_(3)to CaO + CO_(2)`
`2C+O_(2)to 2CO`
`C+O_(2)to CO_(2)`
`Fe_(2)O_(3)+3COto 2Fe+3CO_(2)`

Solution :Decomposition is an endothermic PROCESS.
Discussion
13636.

Which of the following would undergo aldol condensation :

Answer»

`C Cl_3CHO`
`C_6H_5CHO`
`CH_3CH_2CHO`
`HCHO`

ANSWER :C
Discussion
13637.

Which will give a white precipitate with AgN03 in aqueous solution

Answer»

`[Co(NH_(3))_(5)Cl](NO_(2))_(2)`
`[PT(NH_(3))_(6)]Cl_(4)`
`[Pt(en)Cl_(2)]`
`[CU(NH_(3))_(4)]SO_(4)`

Solution :`[Pt(NH_(3))_(6)]Cl_(4) hArr [Pt(NH_(3))_(6)]^(4+)+4Cl^(-),Ag^(+)+Cl^(-) to AgCl`(PPT)
Discussion
13638.

Which of the following solution has higheset resistance ?

Answer»

1 N NaCl
0.1 NaCl
2 N NaCl
0.05 NaCl

Solution :0.05N NaCl LOWEST CONCENTRATION AMONGST all.
Discussion
13639.

(x)underset(H_(2)O) overset(OH^(-))(rarr)beta -hydroxy ketone (x) can't be

Answer»




H -`OVERSET(O)overset(||)(C ) -H`

ANSWER :D
Discussion
13640.

Which of the following may have hexagonal or trigonal crystals :

Answer»

`K_(4)[Fe(CN)_(6)]`
ice
`K_(2)Cr_(2)O_(7)`
Diamond

Answer :B
Discussion
13641.

Which of the following has electronic configuration in violation to Aufbau principle?

Answer»

SILVER (Z=47)
TIN (Z=50)
Magnanese (Z=25)
ARSENIC (Z=33)

ANSWER :A
Discussion
13642.

What are lyophilic and lyophobic sols ? Compare th two in terms of stability and reversibility.

Answer»
Discussion
13643.

Which structure of polymer is correct ?

Answer»


Nylon - 66 rarr `[-HN-(CH_(2))_(6)-NH-(CH_(2))_(4)-CO--]_(n)`
Teflon `rarr [CF_(2)-CF_(2)--]_(n)`
NEOPRENE `[--CH_(2)-UNDERSET(Cl)underset(|)C=CH-CH_(2)-CH_(2)--]_(n)`

ANSWER :C
Discussion
13644.

Write the IUPAC names of the following coordination compounds(a) [Pt(NH_(3))_(2)CH(NO_(2))((b) K_(3)Cr(C_(2)O_(3))] C) [CoCl_(2)(en)_( 2)]CI(d). [CO(NH_(3))_(5)(CO_(3)]CI (e) Hg[Co(SCN)_(4)]

Answer»

Solution : diamminechloridonitroplatinum(II)
(b) potassium trioxalatochromate(III)
(c) dichlororido bis(ETHANE - 1,2-diamine) cobalt(III) CHLORIDE
(d) pentaamminecarbonatocobalt(III) chloride
(e) mercury TETRATHIOCYANATOCOBALTATE(II)
Discussion
13645.

What is meant by 'shape-selective catalysis' of reactions ?

Answer»

Solution :The CATALYTIC reaction which depends upon the PORE STRUCTURE of the catalyst and the size of the reactant and product molecules is CALLED shape selective CATALYSIS.
Discussion
13646.

Which of the following is/are correct concentration term (s) for 11.2 volume H_(2)O_(2) solution ? (density of solution = 1.034 gm//ml )

Answer»

Molarity = 1
`% w//v = 3.4 %`
Molality = 1
`% w//w = 34%`

Solution :(A)`11.2 = 11.2 M` (M = molarity)
M = 1
1 MOLE in 1 litre solution
1 mole in 1034 GM solution(DENSITY of solution `= 1.034` gm/ml )
Mass of solvent `= 1034 - 34 = 1000 gm`
Molality (m) `= ("1 mole")/(1 kg) = 1m`
(C ) `% w//v = ("weight of solute")/("Volume of solution") xx 100 = (34)/(1000) xx 100 = 3.4%`
(D) `11.2 = 11.2 m`
`m = 1 rArr 1 "mole" H_(2)O_(2)` in 1000 mL solution
`rArr 34 gm H_(2)O` in 103 gm solution
`% w//w = (34)/(1034) xx 100 = 32.8 %`
Discussion
13647.

Which of the following compounds show optical isomerism ? (a) Cis - [Co(NH_(3))_(4)Cl_(2)]^(+) (b) trans - [Co(e n)_(2) Cl_(2)]^(+) (c ) cis - [Co (e n)_(2)Cl_(2)]^(+) (d) [Co (e n)_(3)]^(3+)

Answer»

a & b
b & c
c & d
a, b & d

Solution :trans - `[Co(e n)_(2)Cl_(2)]^(+)`
optically INACTIVE, due to PRESENCE of P.O.S.
Discussion
13648.

The vapour pressure of two miscible liquids A and B are 300 and 500 mmHg respectively. In a flask 10 moles of A are mixed with 12 moles of B. However, as soon as B is added, A starts polymerising into a completely insoluble solid. The polymerisation follows first order kinetics. After 100 minutes, 0.525 mole of a solute is dissolved which arrests the polymerisation completely. The final vapour pressure of the solution is 400mmHg. Estimate the rate constant of the polymerisation reaction. Assume negligible volume change on mixing and polymerisation, and ideal behaviour for the final solution.

Answer»

Solution :10 "mole"
`nA(l)overset(B(l)(12"mole"))underset("POLYMERISATION")(to)An(s)`
After 100 MIN : x moles (say)
Rate LAW : Rate `=-(1)/(n) (d[A])/(dt)=k.[A]`
or `-(1)/(n)(dx)/(dt)=k.(x)`
On integration : `nk.=k=(2.303)/(t)log.(a)/(x)`............(1)
[In this PROBLEM n is not given. As n i.e., no. of molecules of a polumerising to give one molecule is a constant for this reaction and so the multiplication of n with the rate constant k. gives another constant k, which may also be CALLED rate constant, though not according to its definition]
Let us now calculate x to get the value of k from Equation (1) .
When `0.525` mole of a solute is added , polymerisation stops and x moles of A remain. Just before the addition of the solute
moles of solvent `A=x`
moles of solvent `B=12`
`:.` vapour pressure of the mixture of solvents `=x_(A)p_(A)^(0)+x_(B)p_(B)^(0)`
`p^(0)=(x)/(x+12)xx300+(12)/(x+12)xx500`.............(2)
Vapour pressure of the solution `p=400`............(3)
(after the addition of `0.525` mole of solute)
Applying Raoult.s law
`(p^(0)-p)/(p^(0))=` mole fraction of the solute
`=(0.525)/(0.525+(x+12))` ...........(4)
Solving equations (2), (3) and (4) we get
`x=2.84`
Substituting `x=2.84`, `t=100m` and `a=10` in Equation (1)
`k=(2.303)/(100)log.(10)/(2.84)=1.2xx10^(-2)min^(-1)`
Discussion
13649.

The standard reduction potential for Cu^(2+)//Cu is +0.34V. Calculate the reduction potential at pH=14 for the above couple. K_(SP) of Cu(OH)_(2) is 1.0xx10^(-19)

Answer»

2.2 V
3.4 V
`-0.22` V
`-2.2` V

Solution :`pH=-log[H^+]=14 rArr [H^+]=10^(-14)`
Hence, `[OH^-]=1M [H^+][OH^-]=10^(-4)`
`CU(OH)_2 to Cu^(2+) + 2OH^-`
`K_"SP"=[Cu^(2+)][OH^-]^2`
For the REACTION, `Cu^(2+) + 2e^(-) to Cu , n=2`
`E_"cell"=E_"cell"^@-0.0591/n"log"1/([Cu^(2+)])`
`E_"cell"=0.34-0.0591/2"log"1/(1xx10^(-19))`=-0.22 V
Discussion
13650.

Which of the following oxidation state is common for all lanthanoids ?

Answer»

`+2`
`+3`
`+4`
`+5`

Answer :B
Discussion