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51.

To observe an elevation of boiling point of 0.0^(@)C, the amount of th solte (Molar mass 100 g mol^(-1)) to be added to 100 g of water (K_(b)=0.5 K mol^(-1))is:

Answer»

2.0 G
0.5 g
1.0 g
0.75 g

Solution :`W_(B)=(M_(B)xxW_(A)xxDeltaT_(b))/K_(b)`
`=((100G MOL^(-1))xx(0.1 KG)xx0.5 K)/((0.5"K kg" mol^(-1)))=1.0g`
Discussion
52.

Which acid can be oxidised by H_2O_2 ?

Answer»

Malonic ACID
ACETIC acid
OXALIC acid
PROPANOIC acid

ANSWER :D
Discussion
53.

Which of the following compounds are chiral and resolvable?

Answer»

`[C_(6)H_(5)N(CH_(2)CH_(2)CH_(3))(C_(2)H_(5))(CH_(3))BR^(-)`
`C_(6)H_(5)N(CH_(3))(C_(2)H_(5))`
`CH_(3)CH_(2)CH(CH_(3))N(CH_(3))(C_(2)H_(5))`

Answer :A::B
Discussion
54.

Which is the effective reducing agent in the extraction of iron from haematite?

Answer»

SOLUTION :The effective REDUCING agent in the extraction of HAEMATITE is CARBON MONOXIDE, `CO`.
Discussion
55.

What istheroleofcoke intheextractionofironfromitsoxides ?

Answer»

Solution : Cokeactsasareducingagentandreducesiron oxideto iron metal.
` "" underset ("Ironoxide")(FeO (s)) +underset ("COKE ") (C(s)) overset (DELTA ) toFe (s//l) + CO(G) `
Discussion
56.

What are thermoplastics ?

Answer»

SOLUTION :These are the LINEAR long CHAIN polymers which BECOME soft on heating and can be used again and again For example , PVC polythene etc.
Discussion
57.

Which of the following will have a trans isomer?

Answer»




ANSWER :B::C::D
Discussion
58.

Which one of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere?

Answer»

Polyhalogens
Ferrocene
Fullerenes
FREONS

SOLUTION :Freons
Discussion
59.

Which one of the following metal ion is present in Haemoglobin ?

Answer»

`Fe^(2+)`
`CO^(3+)`
`Mn^(2+)`
`CU^(2+)`

ANSWER :A::B
Discussion
60.

The relationship between free energy change and emf of a cell is

Answer»

`DeltaG=-nFE`
`DeltaH=-nFE`
`DeltaE=-nFG`
`DeltaF=-nFG`

ANSWER :A
Discussion
61.

What is the equation from of Langmuir isotherm under high pressure ?

Answer»

`x/m=a/b`
`x/m=AP`
`x/m =(1)/(a.P)`
`x/m=b/a`

SOLUTION :According to Langmuir ISOTHERM, `x/m=(aP)/(1+bP).`
Discussion
62.

Which of the following correctly represents the rate of acid-catalysed hydration of following alkenes. (III)PhCH=CH-C_2H_6 , (IV)CH_3-undersetunderset(CH_3)(|)C=CH_2

Answer»

IIIgtIgtIIgtIV
IVgtIIIgtIgtII
IgtIIgtIIIgtIV
IVgtIIIgtIIgtI

Solution :RATE of ACCORDING to STABILITY of CARBOCATION FORMED
Discussion
63.

Which of the following contains p pi - d pi bonds

Answer»

<P>`NO_2`
`SO_3`
`SO_3`
Both 2 and 3

Solution :`SO_2` has ONE `d PI - p pi & SO_3` has two `d pi - p pi` bonds.
Discussion
64.

Which set of reagents Is used for the purpose of adding water to an alkene in a Markovnikov addition without rearrangement ?

Answer»

`BH_(3),THF`followed by `H_(2)O_(2), NAOH` <BR>`H_(2)O H_(2)SO_(4)`
`Br_(2),H_(2)O`
`Hg(O_(2)C CH_(3)),H_(2)O` followed by `NaBH_(4),NaOH`

Answer :D
Discussion
65.

Which of the following is/are act as reducing agent ?

Answer»

`Na_(2)S_(2)O_(3)`
`[Co(NH_(3))_(6)]^(2+)`
`SO_(2)`
`PbO_(2)`

Solution :`overset(+4)PbO_(2)` acts as O.A. as `Pb^(2+)` is STABLE (Inter pair effect).
Discussion
66.

What is the decreasing order of reactivity amongst the followingcompounds towards aromatic electrophilicsubstitution I. ChlorobenzeneII. Benzene III. Anilinium chlorideIV. Toluene

Answer»

`I gt II gt III gt IV`
`IV gt II gt I gt III`
`II gt I gt III gt IV`
`III gt I gt II gt IV`

Answer :B
Discussion
67.

Why benzoic acid is a stronger acid than acetic acid?

Answer»

SOLUTION :The -COOH group in benzoic acid is CONNECTED to `sp^2` hybridised carbon of the benzene ring which is more electronegative than `sp^3` carbon of `-CH_3` to which -COOH is connected in acetic acid. HENCE benzoic acid is stronger acid.
Discussion
68.

Whatcurrentstrengthwill berequiredto deposit2.692 xx10^(-3)kg ofAg in7minutesfromAgNO_(3)solution Molarmass ofAgis 108 xx 10^(-3)kg "mol"^(-1)

Answer»

SOLUTION :CURRENT= I = 5.72 A
Discussion
69.

Union of two or more moleculesof the sam or different compound with elimination of water to form a new substance is known as

Answer»

synthesis
POLYMERISATION
CONDENSATION
NONE of these

Answer :C
Discussion
70.

The symbol Rn represents

Answer»

Radium
Radon
Rhenium
Rhodium

Answer :B
Discussion
71.

Write the IUPAC names of the following compounds : (i) CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")"C "-CH_(2)-CH_(2)OH (ii) CH_(3)-CH_(2)-overset(CH_(3))overset("|")underset("Br ")underset("|")"C "-underset(Br)underset(|)CH-CH_(2)-CH_(2)OH

Answer»

Solution :(i) 3, 3 - Dimethylbutan-1- OL.
(II) 3, 4- DIBROMO -4- methylhexan-1-ol.
Discussion
72.

The type of isomerism shown by C_6H_5CN and C_6H_5NC is :

Answer»

Position
Functional
Enantiomerism
Tautomerism

Answer :B
Discussion
73.

The sweetest sugar among the following is

Answer»

FRUCTOSE
GLUCOSE
SUCROSE
GALACTOSE

ANSWER :A
Discussion
74.

Which one is a natural polymer ?

Answer»

PROTEIN
POLYTHENE
Buna-S
Bakelite

Solution :Protein
Discussion
75.

The reagents which don't react with glucose are I) Schiff's reagent II) Tollen's reagent III) Fehling reagent IV) NaHSO_(3) V) NH_3

Answer»

All
I,IV,V only
I,II,III only
I,IV,III only

Answer :B
Discussion
76.

Write the structural formulae for: (a) Benzotrifuluoride, (b) 3,5-Dinitrobenzyl chloride © Trityl bromide (Triphenymethyl bromide). (d) Biphenyl, (e) 2,4-Dimethyl diphenylmethane, (f) 1,3-Diphenylbutane, (g) Tosyl chloride (p-toluene sulphonyl chloride), (h) Phenylnitromethane.

Answer»

SOLUTION :
Discussion
77.

When a primary amine is heated with CS_2 in presence of HgCl_2, the product formed is :

Answer»

ALKYL CYANATE
Alkyl ISOTHIOCYANATE
CARBYLAMINE
Alkyl cyanide

Answer :B
Discussion
78.

Which of the following is employed in flash tubes in photography?

Answer»

Ar
Ne
KR
Xe

Solution :A mixture of Kr and Xe has been used in flash TUBES for HIGH SPEED photography.
Discussion
79.

Which of the following is not considered as an organometallic compound ?

Answer»


SOLUTION :
Discussion
80.

When calcium carbide is heated in atmosphere of nitrogen in an electric furnance, the compound formed is

Answer»

`CA(CN)_2`
`Ca_3N_2`
`CaNC_2`
CaNCN

Solution :NA
Discussion
81.

When a metal is to be extracted from its ore,if the gangue associated with the ore is silica, then

Answer»

An acidic flux is needed
A basic flux is needed
Both acidic and basic flux are needed
Neither of them is needed

Solution :`underset("Acidic IMPURITY")(SiO_(2))+underset("Basic flux")(CaO) to underset("SLAG")(CaSiO_(3))`
Discussion
82.

Which of the following fractions of petroleum has the lowestb.p.?

Answer»

Kerosene OIL
Gasoline
Diesel oil
Heavy oil

ANSWER :B
Discussion
83.

wedge_(m(NH_(4)OH)^(0) is equal to____

Answer»

`wedge_(m(NH_(4)OH))^(0)+wedge_(m(NH_(4)Cl))^(0)-wedge_((HCl))^(0)`
`wedge_(m(NH_(4)Cl))^(0)+wedge_(m(NaOH))^(0)-wedge_((NaCl))^(0)`
`wedge_(m(NH_(4)Cl))^(0)+wedge_(m(NaCl))^(0)-wedge_((NaOH))^(0)`
`wedge_(m(NaOH))^(0)+wedge_(m(NaCl))^(0)-wedge_((NH_(4)Cl))^(0)`

ANSWER :B
Discussion
84.

Which of the following does not used to convert ketone to secondary alcohol ?

Answer»

`LiAlH_(4)`
`NaBH_(4)`
`H_(2)//Pd-BaSO_(4)`
`Na+C_(2)H_(5)OH`

Answer :C
Discussion
85.

Which of the following is used in the treatment of cholera, acne vulgaris?

Answer»

FLUORO quinolone
aminoglycosides
TETRACYCLINE
macrolides

Solution :tetracycline
Discussion
86.

What is the volumeofCO_2 at NTP produced from 10 gm of pure limestone, when dissolved on excess of dilute HCl ?

Answer»


ANSWER :2.24 LIT.
Discussion
87.

When aqueous ammonia is added to CuSO_4 solution, the solution turns deep blue due to the formation of tetramminecopper (II)complex, [Cu(H_2O)_4]_(aq)^(2+)+4NH_3(aq) hArr [Cu(NH_3)_4]_(aq)^(2+), among H_2O and NH_3 Which is stronger Lewis base.

Answer»

Solution :In a complex ion, the metal ion has greater tendency to accept ELECTRONS and ACTS as Lewis acids and the ligand CAPABLE of donating electrons acts as a Lewis base.
`[Cu(H_2O)_4]_(aq)^(2+)+4NH_(3aq) hArr [Cu(NH_3)_4]_(aq)^(2+)`
In the above REACTION, ammonia replaces water molecules to form the tetraamine complex, so `NH_3` is a STRONGER base than `H_2O`.
Discussion
88.

Which of the following species is polar? CO_(2),BF_(3),XeF_(2),ClF_(3),NH_(3),N(SiH_(3))_(3),XeF_(4),H_(2)O

Answer»


Solution :`ClF_(3),NH_(3) & H_(2)O` are polar
Discussion
89.

Which of the following proceeds with decrea se in entropy?

Answer»

Boiling of an egg
Combustion of BENZENE at `27^@C`
DISSOLUTION of sugar in water
Calcination of solid `CaCO_3`

Answer :B
Discussion
90.

When CO_2 dissolves in water the following equilibrium is established, CO_2 + 2H_2OhArr H_3O^+HCO_3^-for which the equilibrium constant is 3.8 xx 10^(-7)and PH =6.0 The ratio of[HCO_3]/[CO_2^-] IS :

Answer»

`3.8 XX 10^(-18)`
3.8
0.38
13.8

Answer :C
Discussion
91.

Which of the following is the product of the sequence of the reactions

Answer»




ANSWER :A::B
Discussion
92.

Which of the following alkene a most reactive towards cationic polymersation

Answer»

`CH_2=CHCH_3`
` H_2C= CHCL`
` H_2C=CHC_6H_5`
` H_2C =CHCO_2CH_3`

ANSWER :C
Discussion
93.

Which of the following reagents may be used to distinguish between phenol and benzoic acid?

Answer»

NEUTRAL `FeCl_(3)`
Aqueous NaOH
Tollen's reagent
Molisch reagent

Solution :Neutral `FeCl_(3)` gives a BLUE colour with phenol but not with benzoic ACID.
Discussion
94.

Which of the following ligands can show linkage isomerism ?

Answer»

`CNS^(-)`
`NO_(2)^(-)`
`CN^(-)`
`NO_(3)^(-)`

SOLUTION :`CNS^(-),NO_(2)^(-)` and `CN^(-)`are ambidentate ligands.
Discussion
95.

What change would be observed in sulphide ion concentration of 0.05 M H_2S solution if 0.1 mole of HCl is added to one litre of it? K_a(H_2S) = 1 xx 10^(-22)

Answer»

SOLUTION :`1.075 XX 10^(-8)M `to `5.0 xx 10^(-22) M`
Discussion
96.

Which of the following is a globular protein ?

Answer»

Collagen
Myoglobin and Haemoglobin
Myosin
Enzymes

Answer :B
Discussion
97.

Which one of the following is used to treat urinary tract infection and respiratory infections?

Answer»

doxycycline
karamycin
CIPROFLOXACIN
ibuprofen

Solution :ciprofloxacin
Discussion
98.

Which of the following sulphide has the maximum sulubility product ?

Answer»

`HgS`
PbS
CuS
MnS

Solution :The more is `K_(SP) `the higheris soluble .Also in the presence opof `HCI,H_(2)S` gives has `[S^(2-)]` which is sofficient only to cross over the `K_(sp)` of group II SULPHIDE
Discussion
99.

When an aqueous solution containing sodium acetate and sodium propionate is electrolysed we get:

Answer»

ETHANE
Propane
Butane
All of these

Answer :B
Discussion
100.

Two compounds with the formula [Co(NH_(3))_(4)Cl_(2)]^(+)Cl^(-) exist. One of the has violet colour whereas the other has green colour. One of them is ….. Isomer whereas the other is …… isomer.

Answer»

SOLUTION :CIS, TRANS
Discussion