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9051.

Which of the following is NOT used as a fuel in fuel cell

Answer»

Nitrogen
Hydrogen
CARBON Dioxide
Methane

SOLUTION :In fuel cell EXCEPT `N_(2)` all the other gases are used. .
Discussion
9052.

When diethyl ether is heated with dil. H_(2)SO_(4) under pressure, it gives

Answer»

Propanic acid
Acetic acid
Methyl CARBINOL
Ethyl hydrogen SULPHATE

SOLUTION :NA
Discussion
9053.

Which of the following reaction are possible ? (1) ArN_(2)^(+) + CuBr rarr Ar -Br (2) (3) ArN_(2)^(+) + H_(3)PO_(2) overset(H_(2)O)rarr ArH (4) ArN_(2)^(+) + I^(-) rarr ArI Select the answer using codes given below:

Answer»

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

Answer :B
Discussion
9054.

Which of the following element about transition elements is incorrect ?

Answer»

They show variable OXIDATION states
All the ions are coloured
They EXHIBIT DIAMAGNETIC and paramagnetic properties
They exhiibit CATALYTIC property

Answer :b
Discussion
9055.

What is ‘A’ in the following reaction? 2Fe^(3+) (aq) + Sn^(2+) (aq) rarr 2 Fe^(2+) (aq) + A

Answer»

`Sn^(3+)(AQ)`
`Sn^(4+) (aq)`
`Sn^(2+) (aq)`
`Sn(s)`

ANSWER :B
Discussion
9056.

The silver is extracted by Parke's process. The basis of this method is

Answer»

Ag is IMMISCIBLE in molten Zn
Ag is MISCIBLE in NaCN
Ag is more miscible in molten Zn than in molten Pb
Ag is more miscible in moten Pb in COMPARISION to molten Zn

Answer :3
Discussion
9057.

The synthesis of compound 3-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and the alkyne. The bromoalkane and the alkyne are respectively.

Answer»

`BrCH_(2)CH_(2)CH_(2)CH_(2)CH_(3) and CH_(3)CH_(2)C-=CH`
`BrCH_(2)CH_(2)CH_(3) and CH_(3)CH_(2)CH_(2)C-=CH`
`BrCH_(2)CH_(2)CH_(2)CH_(2)CH_(3) and CH_(3)C-=CH`
`BrCH_(2)CH_(2)CH_(2)CH_(3) and CH_(3)CH_(2)C-=CH`

SOLUTION :
Discussion
9058.

Which one of the following has not triangular pyramidal shape ?

Answer»

`NH_3`
`NCI_3`
`PF_3`
`BCL_3`

ANSWER :D
Discussion
9059.

Which of the following has different hybridization than other :-

Answer»

`I_(3)^(-)`
`XeO_(3)`
`SeCl_(4)`
`AsF_(4)^(-)`

Answer :B
Discussion
9060.

What is the geometrical shape of XeO_3

Answer»

Planar triangular
trigonal pyramidal
SQUARE planar
Tetrahedral

Solution :`XeO_(3)` contains THREE sigma bond and ONE LONE pair of electron. Hybrid state of 'Xe' in `XeO_(3)` is `sp^(3)` , hence it's geometry is tetrahedral and shape is trigonal pyramidal
Discussion
9061.

The smell of nitrogen dioxide is:

Answer»

Pleasant
Pungent
Not known
All are wrong

Answer :B
Discussion
9062.

Whatis the current efficiency of anelectrodepositionof Cumetal from CuSO_(4) solutionin which 9.80g copper is deposited by the passage of 5Acurrentfor 2h?

Answer»

0.5
8.528
0.414
1

Solution :`("weight")/("EQUIVALENT weight") =("it")/(96500)`
`(9.8) /(63.5//2) =(ixx2xx60xx60)/(96500) rarr I = 4.14 A`
`therefore`currentefficiency `=("THEORETICAL VALUE of I")/("pratical value of I") XX100`
`=(4.41 )/(5)xx100=82.8 %`
Discussion
9063.

Which of the following exhibits minium number of oxidation states?

Answer»

Th
Np
Mn
Cr

Solution :THORIUM SHOWS (+4) OXIDATION STATE
Discussion
9064.

What are disinfectants ? Give examples.

Answer»

SOLUTION :Disinfectants are chemical substances and are applied to non-living object to kill micro-organisms.
EXAMPLES : CONCENTRATED solution of phenol, sulphur dioxide, CHLORINE.
Discussion
9065.

Which substance are added to food for making food colourful ?

Answer»

FOOD COLOUR
Synthetic colour
Natural colour
Semisynthetic colour 

SOLUTION :Food colour
Discussion
9066.

wedge_(m)^(0)H_(2)O is equal to____

Answer»

`wedge_(m(HCl))^(0)+wedge_(m(NAOH))^(0)-wedge_(m(NaCl))^(0)`
`wedge_(m(HNO_(3)))^(0)+wedge_(m(NaNO_(3)))^(0)-wedge_(m(NaOH))^(0)`
`wedge_((HNO_(3)))^(0)+wedge_(m(NaOH))^(0)-wedge_(m(NaOH_(3)))^(0)`
`wedge_(m(NH_(4)OH))^(0)+wedge_(m(HCl))^(0)-wedge_(m(NH_(4)Cl))^(0)`

Solution :`wedge_(m(H_(2)O))^(@)=lamda_(H^(+))^(@)+lamda_(OH^(-))^(@)`. We GET this expressions from (a) and (d).
Discussion
9067.

Which of the following diazonium salts readily undergo diazo coupling reaction with phenol

Answer»




SOLUTION :W.D.G `UARR` COUPLING REACTION
Discussion
9068.

van't Hoff factor of a 0.5% (w/w) aqueous solution of KCl which freezes at -0.24^@C is (K_f of water = 1.86K "kgmol"^(-1) , mol.wt.of KCl =74.5)

Answer»

1.52
2.32
1.92
1.32

Answer :C
Discussion
9069.

Which of the following molecules cannot show geometric isomerism ?

Answer»

`CH_(3)CH=NOH`
`(CH_(3))_(2)C=NOH`
HO-N=N-OH

Answer :B
Discussion
9070.

Which ofthe followingis a protein hormone ?

Answer»

INSULIN
ANDROGEN
CORTISOL
ESTROGEN

ANSWER :A
Discussion
9071.

Write the chemical reaction to explain kolbe's reaction.

Answer»

SOLUTION :
Discussion
9072.

What is not correct for white phosphorous ?

Answer»

It is heated at 803K to obtain a - black phosphorous.
It is heated under pressure at 473K to obtain p - black phosphorous.
It is INSOLUBLE in water.
It GLOWS in dark.

Answer :A
Discussion
9073.

When a solution of acetic acid in water is shaken with charcoal

Answer»

the concentration of ACID INCREASES in SOLUTION due to adsorption of WATER by charcoal 
the concentration of acid decreases in solution due to the reaction of charcoal with acid 
the concentration of acid remains constant as both water and acid are adsorbed by charcoal 
the concentration of acid decreases in solution due to adsorption of some part of acid by charcoal

Solution :ACETIC acid molecules adsorbed on charcoal so conc `darr`
Discussion
9074.

White ppt of PbCl_(2) is solublein aq NH_(3).

Answer»


Solution :white ppt of `PbCI_(2)` is SOLUBLE in HOT WATER hence false
Discussion
9075.

Which is not characteristic of soap :

Answer»

They are colorless when pure
They are LIGHTER than WATER
They are immiscible with ORGANIC SOLVENTS
They from EMULSIONS with water

Answer :C
Discussion
9076.

The standard oxidation potential of Zn referred to SHE is 0.76V and that of Cu is -0.34V at 25^(@)C. When excess of Zn is added to CuSO_(4),Zn diplaces Cu^(2+) till equilibrium is reached. What is the ratio of Zn^(2+) to Cu^(2+) ions at equilibrium?

Answer»


Solution :`E_(CELL)^(@) = (0.0591)/(2)log.([ZN^(2+)])/([Cu^(2+)])`
`1.1 =(0.0591)/(2)log.([Zn^(2+)])/([Cu^(2+)])`
`([Zn^(2+)])/([Cu^(2+)]) =1.941 xx 10^(37)`
Discussion
9077.

The stable bivalency of Pb and trivalency of Bi is

Answer»

due to d CONTRACTION in Pb and Bi
due to relativistic contraction of the 6s orbitala of Pb and Bi, LEADING to inter pair effect
due to screening effect
due to attainment of noble configuration.

Solution :In the last element of the group, after the REMOVAL of electrons from p-orbitals, the remaining `ns^(2)` electrons behave like stable noble gas and do not take part in COMPOUND formation. This reluctance of the s-electron pair to take part in chemical combination is called inert pair effect. Thus, for the chemical combination is called inert pair effect. Thus, for the element at the bottom of a group, lower oxidation state is more stable.
Discussion
9078.

Which one of the following is wronglymatched?

Answer»

`[Cu(NH_(3))_(4)]^(2+)` - square planar
`[NI(CO)_(4)]` - neutral ligand
`[Fe(CN)_(6)]^(3-)-sp^(3)d^(2)`
`[Co(en)_(3)]^(3+)` - follows EAN RULE.

Solution :`Fe^(3+): [Ar]3d^(5)4s^(0)`

HYBRIDISATION of `[Fe(CN)_(6)]^(3-)` is `d^(2)sp^(3)`.
Discussion
9079.

Which of the following has an ester linkage ?

Answer»

NYLON
BAKELITE
TERYLENE
PVC

Solution :Terylene has ESTER LINKAGE.
Discussion
9080.

Write the structure of maleic acid.

Answer»

SOLUTION :
Discussion
9081.

Which of the following sets of configurations of actinoids is most stable ?

Answer»

`f^(0),f^(5),f^(10)`
`f^(0),f^(7),f^(14)`
`f^(0),f^(1),f^(3)`
NONE of the above

ANSWER :B
Discussion
9082.

Write the names and structures of the monomers used for getting the following polymer : PVC.

Answer»

Solution :`CH_(2) = CH - CL`,chloroethene ( VINYL CHLORIDE ) ismonomer ofpolyinlychloride .
Discussion
9083.

What is single electrode potential?

Answer»

Solution :(i) An electrochemical CELL consists of two half cells. With an open circuit, the metal electrode in each half cell transfers its ions into solution.
(ii) Thus, an INDIVIDUAL electrode DEVELOPS a potential with respect to the solution.
(III) The potential of a SINGLE electrode in a half cell is called single electrodepotential.
Discussion
9084.

Which of the following aldehydes on chlorination will give a product , which can be used for the synthesis of DDT :

Answer»

HCHO
`CH_3CHO`
`CH_3CH_2CHO`
`C_6H_5CHO`

ANSWER :B
Discussion
9085.

What is meant by limiting molar conductivity?

Answer»

Solution :Limiting MOLAR CONDUCTIVITY: the molar conductivity of a solution at infinite dilution is CALLED limiting molar conductivity and is represented by the SYMBOL `^^_(m)^(@)`.
Discussion
9086.

The total spin for atoms with atomic number 7, 24, 34 and 36 will be -

Answer»

`0,+-1,+-3,+-3//2`
`+-1,0,PM3//2,pm3`
`pm3//2,pm3,pm1,0`
`pm3,pm1,0,pm3//2`

Answer :C
Discussion
9087.

Which of the following statements is not true about enzyme inhibitors?

Answer»

Inhibit the catalytic ACTIVITY of the enzyme
Prevent the binding of substrate
Generally a strong COVALENT BOND is formed between an inhibitors and an enzyme
Inhibitors can be COMPETITIVE or non-competitive.

Answer :C
Discussion
9088.

Which of the following is not correct for N_2O?

Answer»

It is called laughing gas
It is nitrous oxide
It is not a LINEAR MOLECULE
It is least REACTIVE in all oxides of nitrogen

Solution :`N_2O` is a linear molecule.
Discussion
9089.

Which of the following carboxylic acids will have the largest K_(a) value ?

Answer»

`CH_(3)CO_(2)H`
`ClCH_(2)CO_(2)H`
`C_(6)H_(5)CO_(2)H`
`CF_(3)CO_(2)H`

Answer :D
Discussion
9090.

Weakest among the following is

Answer»

`H - COOH`
`C_(6)H_(5) - COOH`
`o-NO_(2) - C_(6)H_(4) - COOH`
`CH_(3) - COOH`

ANSWER :D
Discussion
9091.

What is the mole fraction of NaCl, when solution is prepared by dissolving 5.85 gram NaCl in 90 gram of water ?

Answer»

`0.2`
`0.1`
`0.01`
`0.0196`

SOLUTION :`X_(NACL)=(5.85//58.5)/((90)/(18)+(5.85)/(58.5))`
`= (0.1)/(5.1)`
= 0.0196.
Discussion
9092.

What are interstitial compounds? Give their properties.

Answer»

Solution :(i) An INTERSTITIAL compound or alloy is a compound that is formed when small atoms LIKE hydrogen, boron, CARBON or nitrogen are trapped in the interstitial holes in a metal lattice. They are usually non-stoichiometric compounds. e.g., `Tic, ZrH_(1.92), Mn_(4)N`.
(ii) They are hard and show electrical and thermal conductivity.
(iii) they have high melting point
(iv)TRANSITION metal hydrides are used as powerful reducing agent
(V)Metallic carbibes are chemically inert
Discussion
9093.

Which of the following will not occur

Answer»

`FE+ H_(2)SO_(4) to FeSO_(4) + H_(2)` <BR>`Cu+ 2AgNO_(3) to Cu(NO_(3))_(2) + 2Ag`
`2KBr+ I_(2) to 2KI + Br_(2)`
`CuO + H_(2) to Cu+ H_(2)O`

Solution :Electronegativity of `I_(2)` is less than `Br_(2)`. Therefore unable to DISPLACE bromine.
Discussion
9094.

Which does not react with Fehling.s solution:

Answer»

Acetaldehyde
Benzaldehyde
Glucose
Formic acid

Answer :B
Discussion
9095.

Which of the following compounds would be hydrolysed most easily ?

Answer»




ANSWER :C
Discussion
9096.

When excess of sodium thiosulphate is added to dil AgNO_3 solution a soluble compound X is formed . However when dil .Na_2S_2O_3 solution is added to cone AgNO_3 solution a white ppt turning yellow and finally black ppt of Y is obtained . Which is correct pair :

Answer»

X is `Ag_2S` and Y is `Na_3[AG(S_2O_3)_2]`
X is `Na_3[Ag(S_2O_3)_2]` and Y is `Ag_2S`
X is `Ag_2S_2O_3` and Y is `Ag_2S`
X is `Ag_2S_2O_3` and Y is `Na_3[(S_2O_3)_2]`

ANSWER :B
Discussion
9097.

Which of the following compounds does not dissolve in conc. H_2SO_4 even on warming

Answer»

Ethylene
Benzene
HEXANE
Aniline

Solution :Hexane does not DISSOLVE in CONC. `H_2SO_4`
Discussion
9098.

Which amino acid has phenolic OH group as its backbone?

Answer»

Glycine
Leucine
Serine
Tyrosine

ANSWER :D
Discussion
9099.

Which of the following solutions are isotonic with respect of 0.5 M NaCl solution having degree of dissociation= 0.8 ?

Answer»

`153.9 G` of Sucrose dissolved in `500mL` of solution.
`0.3 M` aq. `Na_(2)SO_(4)` solution undergoing `100%` IONIZATION.
`1.8% w//w` aq. `NAOH` solution undergoing `100%` ionization
`1.2 M` benzoic acid in a solution of benzene where the acid dimerizes to an extent of `50%`

Answer :A::B::C::D
Discussion
9100.

The standard e.m.f. of the cell Zn(s)+Cu^(2+)(aq)toZn^(2+)(aq)+Cu(s) is 1.10 V Calculate (i) the standard free energy change, (ii) the equilibrium constant K_(e).

Answer»

Solution :Standarde.m.f. of cell is :
`E_("cell")^(@)=1.10V`
(i) `DeltaG^(@)=~nFE_("cell")^(@)`
`=-(2mol)XX(96500 C mol^(-1))xx(1.10V)`
`=-212300CV""("":.1CV=1J)`
`=-212300J`
or `=-212.3kJ`
(II) `DeltaG^(@)=-RTlnK_(c)`
or `DeltaG^(@)=-RTxx2.303logK_(c)`
or `logK_(c)=(DeltaG^(@))/(2.303RT)`
`R=8.314J,T=298K`,
`DeltaG^(@)=-212.3xx10^(3)J`
`:.logK_(c)=(-212300)/(-2.303xx298xx8.314)`
=37.207
`:.K_(c)=1.64xx10^(37)`
Discussion