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19151.

Which of the following will exhibit geometrical isomerism? (M stands for a metal, and a and b are achiral ligands (1) Ma_2b_2 , (2)Ma_4b_2 , (3)Ma_5b , (4) Ma_6

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

Answer :A
Discussion
19152.

What is the oxidation state of Co in complex [Co(NH_(3))_(2)(NO_(2))Cl] [Au(CN)_(2)] ?

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SOLUTION :`X + 0 - 1 - 1 = + 1` or x = 3
Discussion
19153.

Define plane polarised light.

Answer»

Solution :The LIGHT which has oscillations only in ONE perpendicular direction to the path of propagation is CALLED plane polarised light.
Discussion
19154.

What are cationic detergents? Give an example.

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Solution : QUARTERNARY AMMONIUM salts of amines with acetate, chlorides or bromides as ANIONS. <BR> Example: Cetyltrimethyl ammonium bromide.
OR
`|CH_3(CH_2)_(15)-UNDERSET(CH_3)overset(CH_3)(N)-CH_3|^(+)Br^(-)`.
Discussion
19155.

What is the main composition of matte?

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CuS
CuO
`Cu_(2)S`
`Cu_(2)O`

ANSWER :C
Discussion
19156.

Write the monomers used for getting the following polymers. (i) Polyvinyl chloride (ii) Teflon (iii) Bakelite

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SOLUTION :(i) The monomer of POLYVINYL chloride is : `CH_(2)` = CHCI (Vinyl chloride)
(ii) The monomer of teflon is : `CF_(2)=CF_(2)`(tetrafluoroethene)
(iii) The monomers involved in the fomation of bakelite are HCHO (Formaldehyde) and `C_(6)(H_(5)OH` (Phenol)
Discussion
19157.

Which of the following complexes shows ionization isomerism ?

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`[CR(NH_(3))_(6)]Cl_(3)`
`[Cr(EN)_(2)]Cl_(2)`
`[Cr(en)_(3)]Cl_)(3)`
`[Co(NH_(3))_(5)Br]SO_(4)`

Answer :D
Discussion
19158.

The salt bridge used in Daniel cell contains ………….. .

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`Na_2SO_4 + NaCl`
Agar-Agar GEL + `Na_2SO_4`
SILICA GET + `CuSO_4`
`ZnSO_4 + CuSO_4`

ANSWER :B
Discussion
19159.

Victor Grignard was awrded Nobel prize for making useful compounds by joining organic compounds to :

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Fe
Mg
Proteins
Na

Answer :B
Discussion
19160.

Which of the followingpolymer contains amide linkage

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NYLON -66
Terylene
Teflon
BAKELITE

Solution :
(d) In bakelite, the rings are JOINED to each other through `-CH_(2)-`
Discussion
19161.

Which of the following is a tribasic acid?

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Orthosphoric acid
Phosphorous acid
Meta PHOSPHORIC acid
Pyrophosphoric acid.

Answer :A
Discussion
19162.

Which of the following is used for the treatment of tuberculosis ?

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Penicillin
Streptomycin
Aspirin
Chloramphenicol.

Answer :B
Discussion
19163.

The surface tension of which of the following liquid is maximum ?

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`C_(2) H_(5) OH`
`CH_(3) OH`
`H_(2) O`
`C_(6) H_(6)`

ANSWER :C
Discussion
19164.

The tendency to form monovalent compounds among the group 13 elements is correctly exhibited in......

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B LT Al lt Ga lt In lt TL
Tl lt In lt Ga lt Al lt B
Tl = In lt Ga lt Al lt B
B = Al = Ga = In = Tl

ANSWER :A
Discussion
19165.

Thermal decomposition of alkanes in the absence of air is called as

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Cracking
Oxidation
Combustion
Hydrogenation

Answer :A
Discussion
19166.

Which one of the following is intermediate in the reaction of benzene with CH_(3)Cl in the presence of Anhydrous AlCl_(3) ?

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`Cl^(+)`
`CH_(3)^(-)`
`CH_(3)^(+)`

SOLUTION :Alkylation of the aromatic COMPOUNDS with alkyl halide in presence of aluminium chloride, is KNOWN as Friedel-Crafts reaction.
`CH_(3)Cl+AlCl_(3)toCH_(3)^(-)+AlCl_(4)^(-)`.
Discussion
19167.

What are correct steps to convert acetaldehyde to acetone?

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`CH_(3)MgBr,H_(2)O`,Oxidation
Oxidation, `CA(OH)_(2)`, Heat
Reduction, KCN, HYDROLYSIS
Oxidation `C_(2)H_(5)`ONa, heat

Solution :
Discussion
19168.

Write the IUPAC name of [PtCl(NH_2 CH_3)] (NH_3)_2] Cl.

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SOLUTION :Diammine chloroido (METHYL AMINE) platinum (II) CHLORIDE.
Discussion
19169.

Two radioactive elements X and Y have half-lives of 6 min and 15 min respectively. An experiment starts with 8 time sas many atoms of X as Y. How long it takes for the number of atoms of X left equals the number of atoms of Y left

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6 min
12 min
48 min
30 min

Answer :D
Discussion
19170.

The reagent with which the following reactions is best accomplished is

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`H_(3)PO_(2)`
`H_(3)PO_(3)`
`H_(3)PO_(4)`
`NaHSO_(3)`

Solution :
Discussion
19171.

Which of the following ions has the same number of unpaired electrons as present in V^(3+)?

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`Ti^(3+)`
`Fe^(3+)`
`Ni^(2+)`
`Cr^(3+)`

Solution :Both `V^(3+)` (`3d^(2)` CONFIGURATION) and `Ni^(2+)` (`3d^(8)` configuration) have two unpaired ELECTRONS.
Discussion
19172.

underset"CH"overset"CH"(|||)overset(O_3//NaOH)to X overset(Zn//CH_3COOH)to Y' 'Y' is

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`UNDERSET(CH_2OH)OVERSET(CH_2OH)|`
`CH_3CH_2OH`
`CH_3COOH`
`CH_3OH`

SOLUTION :
Discussion
19173.

Usingdil HCI, which of the following radical cannot be confirmed

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`S^(2-)`
`S_(2)O_(3)^(2-)`
`CO_(3)^(2-)`
`NO_(2)^(Θ)`

Solution :`S^(2-)+2HCIoverset(Delta)rarr underset(("Specific smell"))(underset("Rotten egg smell")(H_(2)Sdarr)+)2CI^(THETA)`
`S_(2)O_(3)^(2-) +2HCI overset(Delat)rarr underset("burning sulphur")underset("smell of")underset("Suffocating")(SO_(2)uarr+2CI^(Theta))+underset("white turbidity")underset("Yellow turbidity or")(Sdarr+H_(2)O)`
`CO_(3)^(2-)+2HCI overset(Delta)underset (or cold)rarr underset(HCO_(3)^(Theta)"also behacve SIMILARLY")underset("with BRISK effervescenes")underset("Odourless GAS evolves")(CO_(2)uarr+H_(2)O +2CI^(Theta))`
Discussion
19174.

What volume of0.8 M solution contains 0.1 m mole of solute :

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100 ML
125 ml
500 ml
0.125 ml

Answer :D
Discussion
19175.

Which one is the correct factor that explains the increase of rate of reaction by a catalyst?

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Shape selectivity
Particle SIZE
Increase of FREE ENERGY
LOWERING of ACTIVATION energy

Answer :D
Discussion
19176.

What is the equilibrium expression for the reaction :P_(4)(s)+5O_(2)(g)hArr P_(4)O_(10)(s)

Answer»

`K=[O_(2)]^(5)`
`K_(c )=([P_(4)O_(10)])/(5[P_(4)][O_(2)])`
`K_(c )=([P_(4)O_(10)])/([P_(4)][O_(2)]^(5))`
`K_(c )=(1)/([O_(2)]^(5))`

SOLUTION :`K_(c )=(1)/([O_(2)]^(5))`
Concentrations of solids are taken as unity.
Discussion
19177.

Which is universally correct for catalyst ?

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A catalyst REMAINS unchanged chemically at the END-of chemical reaction
A catalyst takes part in a chemical reaction
All kinds of catalysts UNDERGO CATALYTIC poisoning
A catalyst physically changes at the end of reaction

Answer :A
Discussion
19178.

What do you understand by the rate law and rate constant of a reaction ? Identify the order of a reaction if the units of its rate constant are : (i) L^(-1) mol s^(-1) (ii) L mol^(-1) s^(-1)

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Solution :The representation of rate of reaction in terms of concentration of the REACTANTS is KNOWN as rate LAW. The rate constant is defined as the rate of reaction when the concentration of reactants is unity.
(i) Zero ORDER
(ii) Second order
Discussion
19179.

Which of the following is incorrect in a galvanic cell ?

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OXIDATION OCCURS at anode .
REDUCTION occurs at cathode
The electrode at which electron are gainedis called cathode
The electrode at which electron are lost is called cathode

Solution : The electrode at which ELECTRONS are lost is called anode
Discussion
19180.

Which of thefollowing group stabilise the phenoxide ion ?

Answer»

`CH_3`
OH
OR
`NO_2`

ANSWER :D
Discussion
19181.

What is the name of the reaction in which benzene diazonium chloride react with benzene to give Biphenyl?

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SANDMEYER's REACTION
Gomberg reaction
Gattermann reaction
Baltz - schiemann reaction

Solution :Gomberg reaction
Discussion
19182.

What is a cause of abnormal colligative properties?

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Solution :When the dissolved solute undergoes a molecular CHANGE like DISSOCIATION or association in the solution, it CAUSES abnormal colligative PROPERTIES.
Discussion
19183.

Which of the following polymers is used to manufacture clothes for firefighters?

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Thiokol
Kevlar
NOMEX
Dynel

SOLUTION :Nomex: it is FACT.
Discussion
19184.

Which of the following is used as a heat transfer medium due to its high b.pt. (531K) ?

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Glycerol
GLYCOL
Diphenyl ether
Anisole.

Solution :Diphenyl ehter has a very high b.pt. (531K). A s such it is used as excellent HEAT TRANSFER agent.
Discussion
19185.

Which of the following match is/are correct regarding B, Al, C and Si elements?

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The highest first ionisation ethalpy : C
The largest ATOMIC SIZE: Al
The most NEGATIVE electron gain ENTHALPY : C
The most metallic character: Al

Answer :A::B::D
Discussion
19186.

The tyndall effect in colloidal solutions is due to

Answer»

SCATTERING of LIGHT
REFLECTION of light
ABSORPTION of light
Electrically CHARGE of particles

Answer :A
Discussion
19187.

Write the hybridisation and magnetic characters of the following complexes : [CoF_(6)]^(3-) [Atomic number : Fe=26,Co=27,Ni=28]

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SOLUTION :`[CoF_(6)]^(3-)`
HYBRIDISATION `=SP^(3)d^(2)`
Magnetic CHARACTER = Paramagnetic
Discussion
19188.

Which of the following is Grignard reagent:

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AMMONIACAL SOLUTION of `AgNO_3`
Ethereal solution of `C_2H_5MgCl`
Alcoholic solution of KOH
Aqueous solution of caustic soda

Answer :B
Discussion
19189.

What are ferromagnetic substances? Give one example.

Answer»

Solution :The substances which are strongly ATTRACTED by the external magnetic field are called as FERROMAGNETIC substances.
EX : `FE, Co, N`,
Discussion
19190.

What should be added to the plastics , to change from hard to soft and readily workable into new object .

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Catalysts
Telomers
Plasticisers
Vulcaniser

Answer :C
Discussion
19191.

Vant Hoff factor for Hg_(2)Cl_(2) assuming 100% ionsiation is ………………

Answer»


ANSWER :C
Discussion
19192.

Which of the following ion is colourless in aqueous solution ?

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`Fe^(2+)`
`Mn^(2+)`
`TI^(3+)`
`Sc^(3+)`

ANSWER :d
Discussion
19193.

Which element among the following does form Ppi - Ppi multiple bonds?

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Arsenic
NITROGEN
PHOSPHORUS
Antimony

Solution :E.C. of N is `to 1s^(2), 2s^(2), 2p_(x)^(1) 2p_(y)^(1) 2p_(z)^(1)`
The structure of `N_(2)` . Triple BOND is made be one `sigma` and two `pi` bonds.
Discussion
19194.

Which of the following will not give Hoffmann bromamide reaction

Answer»

`H_(3)C-overset(O)overset(||)C-NH_(2)`
`Ph-overset(O)overset(||)C-NH_(2)`
`H_(3)C-overset(O)overset(||)C-NH-Br`
`Ph-overset(O)overset(||)C-NH-Ph`

SOLUTION :`1^(@)` AMINES gives the `"REA"^(n)`
Discussion
19195.

Which can be explained as applications of Le Chatelier 's principle :

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Transport of OXYGEN by haemoglobin in blood
Removal of `CO_2` from TISSUES by blood
Tooth DECAY due to USE of sweet substances
All of these

Answer :D
Discussion
19196.

Which of the following structure is represented by 3-cyclohexyl pentan-3-ol?

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NONE of the above

Answer :A
Discussion
19197.

Which of the following acids does not attack Cu and Ag:

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DILUTE `HNO_3`
Dilute HCl
Conc.`H_2SO_4`
Aqua-regia

Answer :B
Discussion
19198.

What happens to the half life period for a first order reaction, if the initial concentration of the reactants is increased?

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Solution :Half life of a first ORDER REACTION is independent of the INITIAL CONCENTRATION of the reactant.
Discussion
19199.

Which alpha amino acids can cross link peptide chains

Answer»

Serine
CYSTEINE
Glutamine
TYROSINE

Answer :B
Discussion
19200.

Which has maximum dipole me

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SOLUTION : has DIPOLE MOMENT TWICE of
Discussion