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10551.

Which of the following alkanes is not obtained by Wurtz reaction ?

Answer»

Methane
Ethane
BUTANE
hexane

Answer :A
Discussion
10552.

Which is used as hydrogen generators

Answer»

NaH
HI
`S_(6)H_(3)`
NONE of these

Solution :`2NaH +2H_(2)O to 2NaOH +H_(2) UARR`
Discussion
10553.

What is the ratio of volumes of H_(2) and O_(2) liberated during electrolysisof acidified water ?

Answer»

`1:2`
`2:1`
`1:3`
`3:1`

ANSWER :A::B
Discussion
10554.

The reagent used for dehalogenation of 1, 2-dibromoethane is:

Answer»

ZN DUST
Zn-Hg
Na
Zn-Cu couple

Answer :A
Discussion
10555.

Titanium can be obtained in a state of high purity by :

Answer»

VAN Arkel METHOD
POLING
CUPELLATION
electrorefining

ANSWER :A
Discussion
10556.

Which of the graphs shown below would best represent the changes when 0.10 M barium hydroxide was titrated with 0.10 M sulphuric acid?

Answer»




ANSWER :B
Discussion
10557.

Which of the following is illustration of homogeneous catalysis ?

Answer»

PRODUCTION of ammonia by Haber process.
Catalytic conversion of `SO_(2)` to `SO_(3)` in CONTACT process.
Hydrolysis of methyl acetate in presence of acid.
Hydrogenation of oil in presence of nickel catalyst. 

Solution :Hydrolysis of methyl acetate in presence of acid.
Discussion
10558.

What is the colour of [Ti(H_(2)O)_(6)]^(3+) complex ion?

Answer»

Blue
Violet
Pink
Green

Answer :B
Discussion
10559.

Write the IUPAC name of following coordination compounds. [Mn(H_2O)_6]^(2+)

Answer»

SOLUTION :Hexa-aqua MANGANESE (II) ION
Discussion
10560.

Yellow ammonium sulphide (YAS) can be used toseprateSnS and As_(2)S_(3).

Answer»


SOLUTION :SnS and `As_(2)S_(3)` both are SOLUBLE in YAS hence false
Discussion
10561.

Write IUPAC name of the following : CH_(3)-O-CH_(2)-underset(CH_(3))underset("|")"CH"-CH_(2)-CH_(3)

Answer»

Solution :`underset("1-Methoxy-2-methylbutane")(CH_(3)-O-OVERSET(1)CH_(2)-overset("2")underset(CH_(3))underset("|")"CH"-overset(3)CH_(2)-overset(4)CH_(3))`
Discussion
10562.

Which of the following group has highest priority order in R-S configuration ?

Answer»

`-CH_(2)OH)`
`-CHO`
`-COOH`
`CH_(2)=CH_(2)`

ANSWER :C
Discussion
10563.

Which of the following statements/relationship is not correct in thermodynamics changes :-

Answer»

W = –nRT ln `v_2/v_1` (ISOTHERMAL reversibleexpansion of an ideal gas)
Q = –nRT ln `v_2/v_1` (isothermal reversible expansion of an ideal gas)
`DeltaU=0` (isothermal reversible expansion of an ideal gas)
`Deltas_"TOTAL" gt 0`(for SPONTANEOUS process)

Answer :B
Discussion
10564.

Which of the following isomers of the formula C_8H_(14) would you expect to give the higest heat of combustion?

Answer»




ANSWER :C
Discussion
10565.

What is the action of aq. NaOH on 1-chloro-2, 4, 6- trinitrobenzene ?

Answer»

Solution :When 1-chloro-2, 4, 6-trinitrobenzene is HEATED with AQ. sodium hydroxide, 2, 4, 6-trinitrophenol (picric acid) is OBTAINED.
Discussion
10566.

Which of the following organic compounds polymerizes to form the polyester Dacron ?

Answer»

PROPYLENE and para `HO-(C_6H_4)-OH`
Benzoic ACID and ethanol
Terephthalic acid and ethylene GLYCOL
Benzoic acid and para `HO-(C_6H_4)-OH`

ANSWER :C
Discussion
10567.

Write the names and structure of the monomers of the following polymer : Neoprene

Answer»

SOLUTION :Neoprene :
`UNDERSET("Chloroprene")(H_2C =OVERSET(CL)overset(|)( C)-CH=CH_2)`
Discussion
10568.

The reason why conc. H_2SO_4 is used to prepare other acids like HCl, HNO_3 etc., is that

Answer»

`H_2SO_4` is a stronger acid than these acids
`H_2SO_4` is a strong dehydrating AGENT
`H_2SO_4` is a strong OXIDISING agent
`H_2SO_4` has a HIGHER boiling point.

Solution :`H_2SO_4` with higher boiling point can easily displace, equally strong but volatile acids like HCL, `HNO_3` easily.
Discussion
10569.

Which of the following is aromatic?

Answer»





Solution :`(4n+2)e^(-)` and COMPLETE delocalisation of `pi` BOND and IONE PIAR.
Discussion
10570.

What amine salts are used for determining their molecular masses?

Answer»

SOLUTION :Chloroplatinates. For example, `(R OVERSET(+)(N)H_(3))_(2)PtCl_(6)^(2-)`
Discussion
10571.

Which of the following is not obtained when ethanol is reacts with H_(2)SO_(4) ?

Answer»

ETHENE
DIETHYL ether
ACETYLENE
None of these

Solution :Acetylene
Discussion
10572.

Which type of bond is present in DNA base ?

Answer»

IONIC BOND
OXO bond
HYDROGEN bond
Metalic bond

Solution :Hydrogen bond
Discussion
10573.

What is Hinsberg's reagent? What is its use?

Answer»

Solution :Benzenesulfonyl chloride, `C_6 H_5 SO_2 Cl` is KNOWN as Hinsberg.s reagent and is USED to DISTINGUISH primary, SECONDARY and tertiary amines.
Discussion
10574.

Write the structure of the major organic product in each of the following reactions :CH_(3)CH_(2)CH=CH_(2)+HBr overset(" peroxide ")rarr

Answer»

SOLUTION :`CH_(3)CH_(2)CH_(2)CH_(2)BR`
Discussion
10575.

Which of the following are purine bases ?

Answer»

GUANINE
ADENINE
Thymine
Uracil

ANSWER :A::B::D
Discussion
10576.

Write the partial structure of Neoprene

Answer»

SOLUTION :
Discussion
10577.

The vapour pressure of a solution containing 108.24 g of a non-volatile solute dessolved in 1000 g of water at 293 K is 17.354 mm Hg. The vapour pressure of water at 293 K is 17.54 mm Hg. Assuming the solution to be ideal, Calculate the molar mass of the solute.

Answer»


Solution :`"Mass of solution "(W_(B))=108.24 g`
`"Mass of solvent "(W_(A))=1000 g`
`"Molar mass of solvent "(M_(A))=18" g MOL"^(-1)`
`"Vapour pressure of solvent "(P_(A)^(@))=17.54 mm.`
`"Vapour pressure of solution "(P_(S))=17.354 `
ACCORDING to Raoult's LAW (Solution is non-ideal):
`(P_(A)^(@)-P_(S))/(P_(S))=n_(B)/n_(A)=W_(B)/M_(B)xxM_(A)/W_(A)`
`((17.54-17.354)mm)/((17.354 mm))=((108.24g))/(M_(B))XX((17.354mm))/((0.186mm))=181.78" g mol"^(-1)
`M_(B)=((108.24g)xx(18" g mol"^(-1)))/((1000g))xx((17.354mm))/((0.186mm))=181.79" g mol"^(-1).`
Discussion
10578.

Which one is not an acid salt

Answer»

`NaH_(2)PO_(2)`
`NaH_(2)PO_(3)`
`NaH_(2)PO_(4)`
None

Solution :In `NaH_(2)PO_(2)` both HYDROGEN are BONDED with 'P', so it is BOT REPLACEABLE.
Discussion
10579.

Which among the following does not give red precipitate with Fehling's solution?

Answer»

Ethanal
Propanal
Butanal
Benzaldehyde

Answer :D
Discussion
10580.

Which of the following do not depend on temperature?

Answer»

% W/V (weight/volume)
MOLALITY
MOLARITY
NORMALITY

ANSWER :B
Discussion
10581.

Write the structures and names of the compounds formed when compound 'A' with molecular formula, C_(7)H_(8) is treated with Cl_(2) in the presence of FeCl_(3).

Answer»

SOLUTION :
Discussion
10582.

What is the efficiency of working of fuel cells ?

Answer»


ANSWER :`70%`
Discussion
10583.

Which of the following reagents can be used to distinguish ethylene from acetylene ?

Answer»

ammoniacal `Cu_(2)Cl_(2)`
ALKALINE `KMnO_(4)`
bromine water
chlorine water

ANSWER :A
Discussion
10584.

Which of the following statement is not correct regarding calcination ?

Answer»

IMPURITIES are removed in the form of elemental vapours
Carbonate ORES convert into their OXIDES
Temperature of the proces is MAINTAINED below the melting point of the mixture
Lower oxidation state oxides are oxidied further

Answer :D
Discussion
10585.

What type of semiconductor is obtained when : (i) Ge is doped with in. (ii) SI is doped with P.

Answer»

Solution :(i) GE belongs to group 14 and In belongs to group 13. THEREFORE, an electron deficient hole is CREATED and it is a p-type semiconductor.
(ii) P belongs to group 15 and Si belongs to group 14. Therefore, an extra electrons gets INTRODUCED and it is a n-type semiconductor.
Discussion
10586.

Which of the following mixtures will have the lowest pH at 298 K?

Answer»

`10 mL 0.05 N CH_3 COOH + 5 mL 0.1 N_4 NH OH`
`5 mL 0.2 N NH _4 CI+ 5 mL 0.2 N NH_4 OH `
`5 mL 0.1 N CH_3 COOH + 10 mL 0.05 N CH_3 COONa `
`5 mL 0.1 N CH_3 COOH + 5mL 0.1 N NAOH`

Solution :
It isacidicbufferpH `=pK_a+ log([CH_3COO^-])/( [CH_3 COOH])`
`PH =pK_a`
` therefore ` thissolutionwill havelowestpH
Discussion
10587.

Value of Henry's constant K_(H) …….

Answer»

Increases wiuth increase in temperature.
DECREASES with increase in temperature.
REMAINS constant.
FIRST increases then decreases.

Answer :A
Discussion
10588.

Which of the following has maximum value of flocculating

Answer»

`Pb^(2+)`
`Pb^(4+)`
`SR^(2+)`
`NA^+`

ANSWER :B
Discussion
10589.

Which of the following is not added during the extraction of silver by cyanide process?

Answer»

NaCN
Air
Zn
`Na_(2)S_(2)O_(3)`

ANSWER :4
Discussion
10590.

Which forces of attraction are responsible for liquefattión of H_(2)

Answer»

COULOMBIC forces
dipole forces
hydrogen bonding
van DER WAALS forces

Answer :B::D
Discussion
10591.

What is copolymers ? Explain with example.

Answer»

Solution :The polymers made by addition polymerization from two different monomers are TERMED as COPOLYMERS. CHAIN terminating stepBuna-S, which is FORMED by polymerization of 1, 3 butadiene and styrene is an example of copolymer formed by addition polymerization.
Discussion
10592.

Which of the following is a lyophobic solution?

Answer»

AQUEOUS STARCH solution
Aqueous solution
Gold sol
Polymer SOLUTIONS in some ORGANIC solvents

Answer :C
Discussion
10593.

x L of nitrogen at N.T.P. contains 3.0xx10^22molecules. The number of molecules in x/2ozone at N.T.P. will be

Answer»

`3.0 xx 10^22 `
`1.5 xx 10^22`
`1.5 xx 10^21`
`1.5 xx 10^20`

Solution :Equal volume of gases at N.T.P. CONTAIN equal NUMBER of MOLECULES
`x/2` L of ozone at NTP will contain
` = (3.0 xx 10^22)/(2) = 1.5 xx 10^22`
Discussion
10594.

Two basic units of which all substances are made up are………………………..and……………………….. .

Answer»

SOLUTION :ATOMS, MOLECULES
Discussion
10595.

The wt. percent of NO_(3)^(-) in the solute in a solution is 20. The volume of solvent containing 60 g of solute (d = 1.2 g/cc)

Answer»

`0.24 dm^(3)`
`0.12 dm^(3)`
`1.2 dm^(3)`
`0.2 dm^(3)`

Solution :WT. of solvent = Wt. of solution- Wt. of solute
`=100 - 20 =80g`
20 g of solute is present in 80 g of solvent.
60 g of solute will be present in `(80 XX 60)/20=240 g
`:."Volume of solvent" = (Wt)/"density"=240/1.2=200 CM ^(3)`
= `0.2 dm^(3)`
Discussion
10596.

Which of the following statements about terylene are correct ? A) It is a poly ester B) It is obtained by the reaction between ethylene glycol and terephthalic acid C) It is a condensation polymer D) It is a natural polymer

Answer»

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

ANSWER :C
Discussion
10597.

Which pairof polymers having similar properties ?

Answer»

Nylon , PVC
PAN, PTFE
PCTFE,PTFE
Bakelite , PVC

Solution :PCTFE (polymonochloro tetrafluoroethylene ) andPTFE (polytetrafluoroethylene)both have same carbon BACKBONE SHOWN RESPECTIVELY as , `[--ClFC-CF_(2)--]_(n), [--F_(2)C-CF_(2)--]_(n)`
Discussion
10598.

Which of the following orders regarding the basic strength of substituted aniline is correct ?

Answer»

p-methylaniline `GT` p-chloroaniline `gt` p- aminoacetophenone
p-methylaniline p- aminoacetophenone `gt` p- chloroaniline
p-aminoacetophenone `gt` p-methylaniline `gt` p - chloroaniline
p-aminoacetophenone `gt` p-chloroaniline `gt` p- methylaniline

Solution :`E.D G uarr` BASIC NATURE `uarr`
Discussion
10599.

Which of the following relation is correct for critical constants

Answer»

`P_(c ) = ( a )/( 27B^(2))`
`V_(c ) = ( 1)/( 3) b `
`T_(c ) = ( 8a)/( 27Rb^(2))`
`p_( c ) = ( 27a)/( Rb^(2))`

Answer :A
Discussion
10600.

Which of the following do you expect to be coloured out of Cr^(+) or Cu^(+) and why?

Answer»

Solution :The electronic CONFIGURATIONS of `Cr^(+)` and `Cu^(+)` are
`Cr^(+) :4S^(0)3d^(5)`
`Cu^(+) :4s^(0)3d^(10)`
`Cr^(+)` has unpaired ELECTRONS in the d-subshell and is, therefore, coloured. On the other HAND, `Cu^(+)` is colourless because it does not have unpaired electrons.
Discussion