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17601.

Write the correct formulae for the following coordination compounds : (a) CrCl_(3) . 6 H_(2)O (violet, with 3 chloride ions/unit formula) (b) CrCl_(3) . 6H_(2)O (light green colour with 2 chloride ions/unit formula) (c ) CrCl_(3) . 6H_(2)O (dark green colour with 1 chloride ion/unit formula)

Answer»

Solution :`(a)[Cr(H_(2)O)_(6)]Cl_(3) (B) [Cr(H_(2)O)_(5)Cl]. H_(2)O (c ) [Cr(H_(2)O)_(4)Cl_(2)]Cl.2H_(2)O`
Note that coordination number of Cr is 6 in each case.
Discussion
17602.

The total number of sigma bonds formed by sp^2-sp^2 overlapping in 1, 3-butadiene is

Answer»

5
2
3
4

Answer :C
Discussion
17603.

Which one of the electron deficient compounds

Answer»

ICl
`NH_(3)`
`BCl_(3)`
`PCl_(3)`

SOLUTION :`BCl_(3)` is electron deficient compound because it has only '6' electrons after forming bond.
Discussion
17604.

Which of the following two monomers are used in preparation of nylon-66 ?

Answer»

Hexamethylene diamine and ethylene GLYCOL
ADIPIC acid and hexamethylene diamine
DIMETHYL terphthalate and ethylene glycol
Adipic acid and ethylene glycol

SOLUTION :Adipic acid and hexamethylene diamine .
Discussion
17605.

The types of isomerism exhibited by [Co(NH_3)_5(NO_2)](NO_3)_2 is

Answer»

GEOMETRICAL and linkage
Geometrical and ionization
Optical and ionization
Co-ordination and hydrate

Answer :B
Discussion
17606.

Type of isomerism which may be possible for the six coordinated complex of metal M having formula of Cr(NO_(2))_(2).6H_(2)O :

Answer»

HYDRATE isomerism
Linkage isomerism
Geometrical isomerism
All are possible

Answer :D
Discussion
17607.

Which of the following can be used to differentiate between acetaldehyde and propanal ?

Answer»

Ammonical `AgNO_(3)`
`CuSO_(4) + NA -K` tartarate in NaOH
`I_(2)` in the PRESENCE of base
Decolourised Fuchin

Answer :C
Discussion
17608.

Which of the following is the sex attractant pheromone

Answer»

CITRAL
Geraniol
BOMBYKOL
Muscalure

Solution :Muscalure is a SEX ATTRACTANT.
Discussion
17609.

Which of the following is a fat soluble vitamin ?

Answer»

VITAMIN A
Vitamin C
Pyridoxine
Vitamin -B- COMPLEX

ANSWER :A
Discussion
17610.

What are vitamins ? Name any two vitamins.

Answer»

SOLUTION : Vitamins : These are the compounds which are required in very small amounts for the GROWTH and good health of HUMAN beings and animal organisms. These can.t be synthesized in the body and have to be SUPPLIED from outside in the diet. e.g. Vitamin B, is Thiamine. Vitamin C is ascorbic acid.
Discussion
17611.

Which of the following sets of elements have the strongest tendency to form anions?

Answer»

N,O,F
P,S,cl
As,Se,Br
Sb,TE,i

Answer :A
Discussion
17612.

Which of the following Amino acid is monomer of nylon-2-nylon-6?

Answer»

ARGININE
Alanine
GLYCINE
Lysine

Solution :Glycine
Discussion
17613.

Which of the following isomerism is/are shown by the complex [CoCl_(2)(OH_(2))_(2)(NH_(3))_(2)]Br?

Answer»

IONIZATION
Linkage
Geometrical
Optical

Answer :A::C::D
Discussion
17614.

Two compounds having the same crystal structures and analogous formulae are called :

Answer»

Isomorphous
Isotopes
Isomers
Isobars

Answer :A
Discussion
17615.

The total number of atoms present in0.1 mole of sucrose (C_12H_22O_11)is :

Answer»

`6.02 XX 10^22`
`2.7 xx 10^24`
`6.02 xx 10^24 `
`2.7 xx 10^25`

Solution :1 mole of `C_12H_22O_11` contains ATOMS
` = 6.02 xx 10^23 xx 45`
0.1 mole of `C_12H_22O_11` contains atoms
` = 6.02 xx 10^23 xx 45 xx 0.1 = 2.7 xx 10^24`
Discussion
17616.

Which alkane would have only the primary and tertiary carbon ?

Answer»

PENTANE
2,2- DIMETHYLBUTANE
2,2- DIMETHYLPROPANE
2-Methylbutane

ANSWER :B
Discussion
17617.

Which of the following electrolytes will have maximum congulating value for AgI//Ag^(+) sol ?

Answer»

`Na_(3)PO_(4)`
`Na_(2)S`
`Na_(2)SO_(4)`
NaCl

Answer :D
Discussion
17618.

Which of the following ligand causes maximum crystals field splitting ?

Answer»

`NH_(3)`
CO
`F^(-)`
`Ox^(2-)`

ANSWER :B
Discussion
17619.

Which of the following will act as buffer

Answer»

`NaCl+NAOH`
Borax+ Boric acid
`NaH_(2)PO_(4)+Na_(2)HPO_(4)`
`NH_(4)Cl+NH_(4)OH`

Solution :(b) and (d) are correct because they have COMMON ION and one of them is WEAK electrolyte.
(a) is not correct because NaCl and NaOH both are strong electrolytes and will not have common ion effect.
© isnot correct because both are salt and strong electrolytes., cannot from buffer solution.
Discussion
17620.

What is the source of activation energy in a photochemical reaction?

Answer»

SOLUTION :the energy made available by visible or ultra violte light as photon (E=hv) is the SOURCE of ACTIVATION energy for photochemical reactions.
Discussion
17621.

Which of the following conformation of n - butane is chiral ?

Answer»




All of these

Answer :C
Discussion
17622.

Which of the following is an ambidentate ligand?

Answer»

`NO_2^-`
`C_2O_4^(2-)`
`SO_4^(2-)`
`NH_3`

ANSWER :A
Discussion
17623.

The salt that does not hydrolyse

Answer»

`CaCl_2`
`SnCl_2`
`SnCl_4`
`MgCl_2`

ANSWER :A
Discussion
17624.

Which reagent is most effective to convert But-2-enal to but-2-en-1-ol?

Answer»

`K_2Cr_2O_7//H_2SO_4`
`KMnO_4`
`H_2//Pt`
`NaBH_4`

SOLUTION :`NaBH_4` REDUCES `C=O` but not `C=C`.
Discussion
17625.

The yeild of production

Answer»

4.24
2.12
42.4
8.48

Answer :A
Discussion
17626.

Which of the following is not a neurotransmitter ?

Answer»

acetylcholine
ADRENALINE
noradrenaline
serotonin

Solution :Adrenaline is a HORMONE but not a NEUROTRANSMITTER
Discussion
17627.

What is the role of desorption in the catalysis?

Answer»
Discussion
17628.

underset(COOH) overset(CHO) (|" ") + NaOH overset(50%) toProduct (s) . Identify the products

Answer»

`underset(COONA) OVERSET(COONa) (|"")`
`underset(COONa) overset(" "CH_(2) - OH) (|"")`
both a andb
`underset(COONa) overset(CHO) (|" ")`

Answer :B
Discussion
17629.

Which of the following is commonly called a ..polyamide..:

Answer»

RAYON
Nylon
Terylene
Orlon

Answer :B
Discussion
17630.

Which of the following is not ore of iron is

Answer»

Galena
Anglesite
Calamine
Cerrusite

Solution :Galena (Pbs), Anglesite `(PbSO_(4))`
Calamine `(ZnCO_(3))`, Cerrussite `(PbCO_(3))`
Discussion
17631.

Which of the following gives a red precipitate with an ammoniacal solution of cuprous chloride ?

Answer»

ACETYLENE
ETHYLENE
ETHANE
All the three

Answer :A
Discussion
17632.

The temperature above which Na_(2)SO_(4).10H_(2)O shows a change in behaviour in the solubility is called……. .

Answer»

SOLUTION :TRANSITION TEMPERATURE
Discussion
17633.

When ethylbenzene is brominated, then which of the following products can be obtained in major amounts

Answer»




SOLUTION :
Discussion
17634.

Which of the following are sulpha drugs?

Answer»

Sulphapyridine
Prontosil
SALVARSAN
NARDIL

Solution :Salvarsan is an ANTIMICROBIAL while Nardil is an ANTIDEPRESSANT DRUG.
Discussion
17635.

What is the number of possible isomer of an octahedral complex : [Co(C_(2)O_(4))_(2) (NH_(3))_(2)]

Answer»

SOLUTION :
Discussion
17636.

Which of the following expression is true :-

Answer»

`H_(F)^(@)(CO,G)=(1)/(2)Delta H_(f)^(@)(CO_(2),g)`
`Delta H_(f)^(@)(CO,g)=Delta H_(f)^(@)("C, graphite") +(1)/(2) Delta H_(f)^(@)(O_(2),g)`
`Delta H_(f)^(@)(CO,g)=Delta H_(f)^(@)(CO_(2),g)-(1)/(2) Delta H_(f)^(@)(O_(),g)`
`Delta H_(f)^(@)(CO,g)=Delta H_("comb")^(@)("C, graphite")-Delta H_("comb")^(@)(CO, g)`

Answer :D
Discussion
17637.

Which of the following is employed as Tranquilizer?

Answer»

Equanil
Naproxen
Tetracyclin
Dettol

Solution :Equanil is a TRANQUILIZER USED in depression and HYPERTENSION.
Discussion
17638.

Which of the following has most density

Answer»

FE
Cu
B
PB

Solution :`Pb rArr 11.34 g//ml ` HEAVIEST.
Discussion
17639.

Which oneamong group - 17 elementsis radioactive ?

Answer»

SOLUTION :ASTATINE (AT)
Discussion
17640.

What is the charge of one electron ?

Answer»

`1.602 xx 10^(19)C`
`1.6 xx 10^(-19)C`
`9645 C`
`96488 C`

Answer :B
Discussion
17641.

What is the shape of Fe(CO)_(5) ?

Answer»

SQUARE pyramidal
Octahedral
Linear
Trigonal bipyramidal

Answer :D
Discussion
17642.

Which series of reactions correctly represents chemical reactions related to iron and its compound ?

Answer»

`Fe overset("dil". H_(2)SO_(4))to FeSO_(4) overset(H_(2)SO_(4)*O_(2))to Fe_(2)(SO_(4))overset("heat")toFe`
`Fe overset(O_(2)"heat")to FeO overset("dil".H_(2)SO_(4))to FeSO_(4) overset("heat")to Fe`
`Fe overset(Cl_(2)"heat")FeCl_(3) overset("heat.air")to FeCl_(2) overset(ZN)to Fe`
`Feoverset(O_(2)"heat")to Fe_(3)O_(4) overset("Co".500^(@)C)to FeO overset(Co.700^(@)C)toFe`

Solution :Sequence D is correct.
`Fe overset(O_(2)"heat")to Fe_(3)O_(4)`. This reaction is combustion of iron.
`Fe_(3)O_(4) UNDERSET(600^(@)C)overset(CO)to FeOunderset(700^(@)C)overset(CO)to Fe. `
These reactions CORRESPOND to production of iron by the reduction of `Fe_(3)O_(4)` in blast furnace.
Discussion
17643.

Why are pentahalides more covalent than trihalides?

Answer»

Solution :According to FAJAN's RULES, covalent character increases with decrease in size of covalent `E^(5+)` (E=element of group 15) is smaller than `E^(3+)`. Therefore pentahalides in which element is in `+5`oxidation STATE are more covalent than trihalides m which the element is in `+3` oxidation state.
Discussion
17644.

The solution which do not obey the Raoult's law over the entire range of concentration is called which solution ?

Answer»

IDEAL
NON Ideal
TRUE Solution
(B) and (C ) both

ANSWER :D
Discussion
17645.

Using the data in the preceding problem, calcualte the equilibrium constant of the reaction at 25^(@)C. Zn + CU^(2+) rightarrow Zn^(2+) + Cu K= [Zn^(2+)]/[(Cu^(2+)]

Answer»

`9.85 XX 10^(24)`
`4.831 xx 10^(31)`
`9.85 xx 10^(36)`
`4.831 x 10^(44)`

Answer :C
Discussion
17646.

When magnesium burns in air, compounds of magnesium formed are magnesium oxide and:

Answer»

`Mg_(3)N_(2)`
`MgCO_(3)`
`MG(NO_(3))_(2)`
`MgSO_(4)`

Answer :A
Discussion
17647.

Which furnace can be used to get temperature above 3000@C ?

Answer»

BLAST FURNACE
ARC furnace
Reverberatory furnace
None

Answer :B
Discussion
17648.

When 2, 4–dinitroaniline react with NaNO_(2) + HCl at 5^(@)C followed by reaction with anisole, a coloured compound is formed which can be given as :

Answer»




SOLUTION :
Discussion
17649.

Which of the following will have a mesoisomer also

Answer»

2,3-dichloropentane
2-3,-dichlorobutane
2-chlorobutane
2-hydroxypropanoic ACID

SOLUTION :
Discussion
17650.

Which of the following does not adopt hcp structure ?

Answer»

Be
Mg
Fe
Mo

Solution :IRON has CCP STRUCTURE.
Discussion