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2451.

Which of the following reagents can be used to distinguish the SO_2 and CO_2 ?

Answer»

LIME water
Zinc nitroprusside paste in water
POTASSIUM iodate and starch
Acidified potassium dichromate SOLUTION

Solution :(B)Red COLOUR compound of unknown composition is formed when moist `SO_2` is brought in contact with `Zn[Fe(CN)_5NO]` (salmon colour) paste in water.No colour change with `CO_2`.
(C )`5SO_2+2IO_3^(-)+4H_2O to I_2+5SO_4^(2-)+8H^(+) , I_2+` starch `to` blue colour.
No colour change observed with `CO_2`.
(D)`3SO_2+Cr_2O_7^(2-)+2H^(+)to2Cr^(3+)`(GREEN solution) +`3SO_4^(2-) + H_2O`
No colour change is observed with `CO_2`
Discussion
2452.

Write the IUPAC nomenclature of the given complex along with its hybridization and structure K_(2) [Cr(NO)(NH_(3))(CN)_(4)], mu = 1.73 BM

Answer»

Solution :Potassium aminetetracyanonitrosoniumchromate (I), OCTAHEDRAL shape Potassiumamminetetracyano(C)nitrosoniumchromium(I) CRIS in + 1 state and `d^(2)SP^(3)` HYBRIDISATION No. of unpaired electron `mu=sqrt( n(n+2)) = sqrt3= 1.73 B.M`.
Discussion
2453.

Which of the following shows maximum diversity?

Answer»

water at `25^(@)C`
ice at `- 4^(@)C`
water at `4^(@)C`
ice at `0^(@)C`

Answer :C
Discussion
2454.

Which of the following statement is not correct for [Ni(CN)_(4)]^(2-) and [NiCl_(4)]^(2-) complexes.

Answer»

Both have Niin + II oxidationstate.
`[NiCl_(4)]^(2-)` is a low spin while `[Ni(CN)_(4)]^(2-)` is a high spin complex.
`[NiCl_(4)]^(2-)` is tetrahedral while `[Ni(CN)_(4)]^(2-)` is SQUARE planar.
`[NiCl_(4)]^(2-)` involves `SP^(3)` hybridisation and `[NiCN_(4)]^(2-)` involves `dsp^(2)` hybridisation.

Answer :B
Discussion
2455.

Vinyl halides are inert towards both S_(N^(1)) and S_(N^(2)) reactions. Assign reason.

Answer»

SOLUTION :Vinyl halides exhibit resonance. As a result the `C-X` bond has a partial double bond character.

In `S_(N^(1))` reaction, `C-X` the bond is to cleave to FORM a carbocation INTERMEDIATE. IN `S_(N^(2))` reaction. the bond has to again cleave to accommodate the attacking nucleophile. this means that vinyl halides are RELUCTANT to respond to both types of reaction.
Discussion
2456.

Vapourphasenitration ofalkanetakesplaceat temperature

Answer»

`400 to 500 k`
`323 k to598 k`
423 k to 698 k
750 k

Solution :Reactioncarriedout in vapourphase
Discussion
2457.

Which of the following is a transition metal ?

Answer»

Ca
Cs
Co
Cl

Answer :C
Discussion
2458.

The two complexes given below are

Answer»

geometrical isomers
psition isomers
optical isomers
IDENTICAL

SOLUTION :Both the COMPLEXES are identical . These are trans isomers.
Discussion
2459.

The standard oxidation potentials of two metals M_(1) and M_(2) are 0.76 V and -0.34 Vrespectively. If a rod of metal M_(1) is dipped into an aqueoud solution of metal M_(2) , then the following happens,

Answer»

no REACTION TAKES place
reaction takes place
metal `M_(2)` will be deposited at `M_(1)`
metal `M_(1)` will be deposited at `M_(2)`

Solution :Compare SOP.
Discussion
2460.

Which among the following has both local anaesthetic and antiseptic properties?

Answer»

BENZYL BENZOATE
phenol
benzyl ALCOHOL
n-propyl alcohol

ANSWER :C
Discussion
2461.

Which of the following is the correct order of acidic strength ?

Answer»

`Cl_(2)O_(7)gtSO_(3)gtP_(4)O_(10)`
`CO_(2)gtN_(2)O_(5)gtSO_(3)`
`Na_(2)OgtMgOgtAl_(2)O_(3)`
`K_(2)OgtCaOgtMgO`

Answer :A
Discussion
2462.

What is the formula of Triammine triaquachrmium (III) chloride ?

Answer»

`[CrCl_(3)][CR(H_(2)O)_(3)]Cl_(3)`
`[Cr(NH_(3))_(3)(H_(2)O)_(3)]Cl_(3)`
`[Cr(H_(2)O)_(6)][CrCl_(3)]`
`[Cr(NH_(3))_(2)(H_(2)O)_(4)]Cl_(3)`

Answer :B::C
Discussion
2463.

Which one of the following metals will give blue ash when its salt is heated with Na_(2)CO_(3) solid and Co(NO_(3))_(2) on a charcoal piece

Answer»

`CU`
`Mg`
`Al`
`Zn`

SOLUTION :`CoAlO_(2)` is formed which is BLUE. FOLLOW cobalt nitrate-charcoal test.
Discussion
2464.

Which one of the following is an example for heterogeneous catalysis?

Answer»

Decomposition of ACETALDEHYDE by `I_(2)`, catalyst
Decomposition of `H_2O_2` in the PRESENCE of PT catalyst
Acid HYDROLYSIS of ester
Hydrolysis of cane sugar with MINERAL acid

Solution :Decomposition of `H_2O_2` in the presence of Pt catalyst
Discussion
2465.

Which one of the following is not the correct reaction of aryldiazonium salts ?

Answer»

`C_(6)H_(5)N_(S)^(+)Cl^(-)+Cu_(2)Cl_(2) rarr C_(6)H_(5)Cl^(-)`
`C_(6)H_(5)N_(S)^(+)Cl^(-)+ HBF_(4) overset("Heat")(rarr) C_(6)H_(5)F`
`C_(6)H_(5)N_(S)^(+)Cl^(-)+H_(3)PO_(3) rarr C_(6)H_(5)PO_(4)`
`C_(6)H_(5)N_(S)^(+)Cl^(-)+SnCl_(2)//HCL rarr C_(6)H_(5)NHNH_(2)`

Answer :C
Discussion
2466.

What happens when NH_4OH solution is added drop by drop to CuSO_4 solution till excess?

Answer»

Solution :FIRST a bluish white precipitate is formed. When excess of ammonium HYDROXIDE is added a deep BLUE colouration is obtained due to the FORMATION to tetramine copper(II) sulphate complex.
Discussion
2467.

Which of the following forms cationic micelles above certain concentration

Answer»

cetyl TRIMETHYL ammonium BROMIDE
UREA
SUCROSE
potassium acetate

Solution :cetyl trimethyl ammonium bromide
Discussion
2468.

This section contains Three questions. The section contains Two tables (each having 3 columns and 4 rows). Based on each table, there are THREE questions. Each question has FOUR options (A), [B]. [C], and [D]. ONLY ONE of these four options is correct. Answer Q. 1, 2 and 3 by appropriately matching the information given in the three columns of the following table. Q Find CORRECT combination:

Answer»

(III) (iii)(P)
(I) (iv)(Q)
(IV) (iv)(R)
(IV) (ii)(R)

SOLUTION :`Be_(3)Al_(2)Si_(6)O_(18)` (Beryl)
(according to charge balance in a molecule) 2n + 6 + 24 - 36 = 0 n = 3
Discussion
2469.

Which of the folllowing can be used to distinguised between 1-butene and 2-butene?

Answer»

Baeyer's reagent
Hot ALK. `KMnO_(4)`
Reductive ozonolysis
Tollen's reagent

Solution :(A) Baeyer's reagent will be decolourised both by 1-butene and 2-butene.
(B) `UNDERSET("But-1-ene")(CH_(2)=CH-CH_(2)-CH_(3)+4[O])`
`overset("Hot alk." KMnO_(4))rarr CO_(2)+H_(2)O+ underset("Propanoic acid")(CH_(3)CH_(2)COOH)`
Discussion
2470.

The triangleG in the process of melting of ice at - 156@C is:

Answer»

`triangleGlt0`
`triangleGgt0`
`triangleG=0`
All

Answer :B
Discussion
2471.

What will be the value of x, y and z in the following equation. H_(2)C_(2)O_(4)+xH_(2)O_(2)rarryCO_(2)+zH_(2)O

Answer»

2,1,2
1,2,2
2,2,1
None

Solution :(i) The half reaction for oxidation is,
`H_(2)C_(2)O_(4)+xH_(2)Orarr yCO_(2)+zH_(2)O`
Balancing carbon atoms on both sides,
`H_(2)C_(2)O_(4)rarr2CO_(2)`
Balancing hydrogen atoms on both sides,
`H_(2)C_(2)O_(4)rarr2CO_(2)+2H^(+)`
Balancing the charge on both sides,
`H_(2)C_(2)O_(4)rarr2CO_(2)+2H^(+)+2e^(-)` (balanced)
(ii) The half reaction for REDUCTION is,
`H_(2)O_(2)rarrH_(2)O`
Balancing oxygen atoms on both sides,
`H_(2)O_(2)rarr2H_(2)O`
Balancing hydrogen atoms,
`H_(2)O_(2)+2H^(+)rarr2H_(2)O`
Balancing the charge,
`H_(2)O_(2)+2H^(+)+2e^(-)rarr2H_(2)O` (balanced)
Now, ADDING both equation,
`H_(2)C_(2)O_(4)+H_(2)O_(2)rarr2CO_(2)+2H_(2)O`
Discussion
2472.

Which of the following has highest nucleophilicity?

Answer»

`F^(-)`
`OH^(-)`
`CH_(3)^(-)`
`NH_(2)^(-)`

ANSWER :C
Discussion
2473.

The relationship between the dissociation energy of N_(2) and N_(2)^(+) is

Answer»

DISSOCIATION enerty of `N_(2)=` dissociation energy of `N_(2)^(+)`
dissociation energy of `N_(2)` can either be lower or HIGHER than the dissociation energy of `N_(2)^(+)`
dissociation energy of `N_(2)gt` dissociation energy of `N_(2)^(+)`
dissociation energy of `N_(2)^(+) gt` dissociation energy

Solution :Bond order of `N_(2)=3` Bond order of `N_(2)^(+)=2 1/2`
Hence dissociation energy of `N_(2)gt` dissociation energy of `N_(2)^(+)`.
Discussion
2474.

Which of the following alkyl halide will undergo S_N 1 reaction is

Answer»

`(CH_3)_3C-F`
`(CH_3)_3C-Cl`
`(CH_3)_3C-Br`
`(CH_3)_3C-I`

ANSWER :D
Discussion
2475.

Which of the following catalyse the chemical reaction in living organism?

Answer»

ENZYMES
protein
lipids
serum

Solution : enzymes
Discussion
2476.

The unit of K_(c) from the reaction N_(2)+H_(2)hArr2NH_(3)+Q is

Answer»

`lit^(2)MOL^(-2)`
`mollit^(-1)`
`mol^(2)lit^(2)`
`lit mol^(-2)`

Solution :`K_(c)=([NH_(3)]^(2))/([N_(2)][H_(2)])=([mol//lit]^(2))/([mol//lit][mol//lit]^(3))=lit^(2)mol^(-2).`
Discussion
2477.

This section contains Three questions. The section contains Two tables (each having 3 columns and 4 rows). Based on each table, there are THREE questions. Each question has FOUR options (A), [B]. [C], and [D]. ONLY ONE of these four options is correct. Answer Q. 1, 2 and 3 by appropriately matching the information given in the three columns of the following table. Q Find CORRECT combination:

Answer»

<P> (II) (III) (S)
 (III) (II) (P)
 (III) (II) (S)
(IV) (II) (R)

Answer :B
Discussion
2478.

Which statement is FALSE regarding NH_(3) and PH_(3) ?

Answer»

`PH_(3)` is weaker base than `NH_(3)`
`PH_(3)` is weaker reducing agent than `NH_(3)`
`PH_(3)` is less soluble in water than `NH_(3)`
`PH_(3)` BURNS in oxygen to give `P_(2)O_(5)` WHEREAS `NH_(3)` burnsin oxygen to give `N_(2)`.

ANSWER :B
Discussion
2479.

Which of the following would not change the pH of 10 cm of dilute HCl when added to the acid ?

Answer»

` 5 cm^3` of PURE WATER
`20 cm^3` or purewater
`10 ,cm^3`of concHCI
`20cm^3` of samedil HCI

Solution :there is nochangein PHon mixingtwodilHCIsoiutionsofequalconcentrationin anyproportion
Discussion
2480.

Which of the following compound will give a yellow precipitate with iodine and alkali?

Answer»

a.2-Hydroxy
b.Acetophenone
c.Methyl acetone
d.Acetone

Solution :
Discussion
2481.

Which of the following will exhibit chirality?

Answer»

Neopentane
Isopentane
3-Methylhexane
2-Methylhexane.

Answer :C
Discussion
2482.

Thionyl chloride is preferred to as the reagent to prepare acid chlorides. Why?

Answer»


Answer :`R-COOH+SOCl_2rarrR-COCl+HCL+SO_2`
SINCE the by-products of the REACTION (HCl and `SO_2`) are gases, they escape leaving behind pure acid CHLORIDE.
Discussion
2483.

Which of the following complexes exhibits the highest paramagnetic behaviour ? (gly = glycine, en = ethylenediamine and bipy = bipyridyl)

Answer»

`[FE(en)(bipy)(NH_3)_2]^(2+)`
`[CO(O X)_2 (OH)_2]^(-)`
`[Ti(NH_3)_6]^(3+)`
`[V(GLY)_2(OH)_2(NH_3)_2]^(+)`

Answer :A
Discussion
2484.

Which is the correct structural formula for terylene ?

Answer»




SOLUTION :TERYLENE is KNOWN as POLY (ETHYLENE terphthalate)
Discussion
2485.

Which of the following is more effective in coagulating positively charged hydrated ferric oxide sol: (i) KCl, (ii) CaSO_(4), (iii) K_(3)[Fe(CN)_(6)]?

Answer»

SOLUTION :`K_(3)[Fe(CN)_(6)]`
Discussion
2486.

Which of the following statement is incorrect for metals involving in formation of alloys

Answer»

must have ALMOST same atomic radii
must have SIMILAR chemical properties, especially number of VALENCY electrons
must have similar CRYSTAL structures
must BELONG to same 'd' series

Answer :D
Discussion
2487.

Which of the following dissolves in water but does not give any oxyacid solution?

Answer»

`SO_(2)`
`OF_(2)`
`SCl_(4)`
`SO_(3)`

Solution :`H_(2)O + OF_(2) overset("very slowly")rarr 2HF + O_(2)` (`OF_(2)` is NEUTRAL towards litmus)
Discussion
2488.

Which of the following statement is correct for [NiCl_(2)(NH_(3))_(2)]^(0) (spin magnetic moment =0) ?

Answer»

It is OPTICALLY active complex
It is high spin complex
It is tetrahedral complex
It has two stereo ISOMERS

SOLUTION :`[NiCl_(2)(NH_(3))_(2)]`
`overset(+2)(DSP^(2))`
(cis-trans)
Discussion
2489.

When tautomeric form is less stablecalled the-

Answer»


ANSWER :LABILE FORM
Discussion
2490.

Two oxides of nitrogen, NO and NO_(2) are allowed to react together at 243 K and form coloured compound of nitrogen (X), When compound (X) reacts with water to yeild another compound of nitrogen (Y). The shape of the anion (Y) molecule is

Answer»

angular
triangular pyramidal
tetrahedron
square planar

Answer :A
Discussion
2491.

Which one is a nucleophile substitution reaction among the following ?

Answer»


SOLUTION :`SN^1`mechanism involves carbocation as the intermediate .
The recemised PRODUCTS are FORMED , but the INVERTED product is more than the retended one.
Discussion
2492.

Which one is not a secondary battery?

Answer»

laclanche cell
Ni-Cd cell
Mercury cell
Daniel cell

Answer :A::C::D
Discussion
2493.

The vitamins absorbed from the intestine along with fats are:

Answer»

A,D
A,B
A,C
D,B

Answer :A
Discussion
2494.

Which will give carbylamine test,

Answer»

Uera
`CH_3CONH_2`
`C_2H_5NH_2`
All

Answer :C
Discussion
2495.

Which instrument is used to measure electrical resistance ?

Answer»

Voltmeter
WHEATSTONE BRIDGE
Galvanometer
Ammeter

Solution :Wheatstone bridge.
Discussion
2496.

When BaCl_(2)is added to an aqueous salt solution, a white precipitate is obtained. The anion among CO_(3)^(2-) , SO_(3)^(2-) and SO_(4)^(2-)that was present in the solution can be

Answer»

`CO_(3)^(2-)`but not any of the other two
`SO_(3)^(2-)` but not any of the other two
`SO_(4)^(2-)` but not any of the other two
any of them.

Solution :`BaCO_(3) , BaSO_(3)` and `BaSO_(4)` are all white precipitates in aqueous solution .
Discussion
2497.

What type of stoichiometric defect is shown by AgBr and AgI ?

Answer»

SOLUTION :FRENKEL DEFECT.
Discussion
2498.

Turnbull’s blue is:

Answer»

FERRICYANIDE
FERROUS ferricyanide
Ferrous cyanide
Ferri-ferrocyanide

Answer :B
Discussion
2499.

The various oxidation states of sulfur are ........... While those of oxygen ..............

Answer»

SOLUTION :`-2,+2,+4,+6,: - 2, + 1 + 2`
Discussion
2500.

Which expression is wrong for first order reaction

Answer»

`K = (2.303)/(t) "log" ((A_(0))/(At))`
`k = (t)/(2.303) "log" ((A_(0))/(At))`
`-k = (t)/(2.303) "log" ((At)/(A_(0)))`
Rate = k[A]

Solution :The rate for FIRST ORDER reaction is expressed as :
`A to ` Products
Rate = `- (d[A])/(DT)`
Rate = k [A]
and the rate constant (k) is given as :
`k = (2.303)/(t)` log `([A_(0)])/([A_(t)])` or `-k = (2.303)/(t)` log `([A_(t)])/([A_(0)])`
Discussion