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9401.

When halogen (except F_2) is passed through alkali in different conditions, the halogen undergoes

Answer»

OXIDATION only
REDUCTION only
both oxidation and reduction
NEITHER oxidation nor reduction

Answer :C
Discussion
9402.

What ismeant by lanthanoidcontraction ?

Answer»

SOLUTION :The steadydeceasein the ATOMIC / ionicradiusfrom `LA^(3+) ` to `LU^(3+)` is calledlanthanoidcontraction.
Discussion
9403.

When heated NH_(3) is passed over CuO gas evolved is

Answer»

`N_(2)`
`N_(2)O`
`HNO_(3)`
`NO_(2)`

ANSWER :A
Discussion
9404.

Unit of the rate of reaction is_____.

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SOLUTION :MOLES `liter^-1sec^-1` or moles `liter^-1mol^-1`
Discussion
9405.

Which of thefollowingis the major producedfrom the sulphonation of alpha- tetralone?

Answer»




ANSWER :C
Discussion
9406.

The S-ibuprofen is responsible for its pain relieving property. Which one of the structures shown in S-ibuprofen?

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ANSWER :D
Discussion
9407.

The slag obtained during the extraction of copper pyrites is composed mainly of :

Answer»

`Cu_2S`
`FeSiO_3`
`CuSiO_3`
`SiO_2`

ANSWER :B
Discussion
9408.

Which cation gives a clear coloured solution with excess of aqueous ammonia ?

Answer»

`CU^(2+)`
`FE^(3+)`
`Al^(3+)`
`Mg^(2+)`

Answer :A
Discussion
9409.

When 0.6 g of an organic compound decomposed, 112 mL of nitrogen and 226 mL of carbon dioxide were released at STP. The molecular weight of the compound is likely to be:

Answer»


Solution :0.6 g of the organic COMPOUND can GIVE `112/22400` moles of `N_2` gas. Thus, `10^(-2)` moles of N-atom are PRESENT in 0.6 gm. of the compound. So minimum MOLAR mass of the compound is 60 gram/mole.
Discussion
9410.

Which of the following statements about colloids is False ?

Answer»

When silvernitrate solution is added to potassium iodide solution a negatively charged colloidal solution is formed.
Freezing point of colloidal solution is LOWER than true solution at same CONCENTRATION of a solute.
Colloidal particles can pass through ORDINARY FILTER paper.
When excess of electrolyte is added to colloidal solution, colloidal particle will be precipitated.

Answer :B
Discussion
9411.

When 9.65 coulomb of electricity is passed through a solution of AgNO_3(at.wt. 108.0 ) the amount of silver deposited is :

Answer»

10.8 mg
5.4 mg
16.2 mg
21.2 mg

Answer :A
Discussion
9412.

Which among the following reactions is involved for the removal of permanent hardness by anion exchanger resin

Answer»

`Na_(2)AI_(2) SI_(2) O_(8). xH_(2) O + MG^(2+) to` PRODUCT
`Na_(2) [Na_(4)(PO_(3))_(6)] + Mg^(2+) to` product
`R = NH_(3)^(+) OH^(-) + SO_(4)^(2-) to` product
`Na_(2) CO_(3) + Ca^(2_) to` product

Solution :`2 underset("Resin")(RNH_(3)^(+) OH^(-) + SO_(4)^(2-) to (RNH_(3))_(2) SO_(4) + 2OH^(-)`
Discussion
9413.

Which of the following molecules is/are planar ?

Answer»

`[NI(CO)_(4)]`
`[Ni(CN)_(4)]^(2-)`
`I_(2)Cl_(6)`
`[PtCl_(4)]^(2-)`

SOLUTION :
Discussion
9414.

Which oxide is amphoteric in nature?

Answer»

BaO
CaO
BeO
MgO

Answer :C
Discussion
9415.

Which element can be present in anode mud ?

Answer»

ZN
Fe
Au
Ni

Solution :Au is NOBLE metal , transfer in ANODE MUD instead of solution
Discussion
9416.

Which of the following pairs is not correct?

Answer»

VISCOSE - SYNTHETIC FIBRE
Polysaccharide - ARTIFICIAL silk
Nylon-6,6 - Heteropolymer
Nylon-6 - PERLON - L

Solution :Viscose is a regenerated fibre.
Discussion
9417.

What is the signigicance of reciprocal of 'gold number' ?

Answer»

SOLUTION :Smaller the gold number, GREATER is its protective power. HENCE, RECIPROCAL of gold number is a direct measure of the protective power of the colloid.
Discussion
9418.

Write the named reactions involved in the following conversions: (ii) 2HCHOoverset(NaOH)rarrHCOONa+CH_3-OH

Answer»


ANSWER :CANNIZZARO REACTION
Discussion
9419.

Urea reacts with Br_2 in dil HCl to liberate N_2 How many moles of bromine is required to completely react with one mole of urea ?

Answer»


SOLUTION :`NH_(2)CONH_(2)+3Br_(2)+8KOH to K_(2)CO_(3)+6H_(2)O+6KBr+N_(2)`
Discussion
9420.

Two glass bulbs of equal volume and filled with an ideal gas at 500 K and pressure of 76 cm of Hg are connected by a norrow tube.One of the bulb is then placed in a water bath maintained at 700 K and the other bulb is maintained at 500 K.What is the new value of the pressure (in cm of Hg) inside the bulbs ? The volume of the connecting tube is negligible.Report your answer after multiplying by 6/7.

Answer»


SOLUTION :NA
Discussion
9421.

Which may be added to one litre of water to act as a buffer ?

Answer»

ONE MOLE of `HC_2H_3O_2` and one MOLEOF HCl
One mole of `NH_4OH` and on moleof NaoH
one mole of `NH_4Cl and one mole of HCl
One mole of `HC_2H_3O_2` and 0.5 moleof NaoH

Answer :D
Discussion
9422.

Using valence bond theory, predict the shape and magnetism (paramagnetic or diamagnetic) of [Co(CO)_(4)]^(-).

Answer»

Solution :ELECTRONIC configuration of Co : `4s^(2)3d^(7)`
Electronic configuration of `CO^(-1) = 4s^(2)3d^(8)`
CO is a strong ligand causing pairing of ELECTRONS. Thus, `Co^(-1) : 4s^(0)3d^(10)`

It has `SP^(3)` hybridisation and tetrahedral geometry. As there are no unpaired electrons, the complex ion is diamagnetic.
Discussion
9423.

Which of the following configuration can undergo distortion

Answer»

`t_(2g)^(6)e_(g)^(1)`
`t_(2g)^(6)e_(g)^(2)`
`t_(2g)^(6)e_(g)^(4)`
`t_(2g)^(6)e_(g)^(0)`

Solution :Repulsion by six ligands in an octahedral complex splits the d-orbitals on the central atom into `t_(2g)` and `e_(g)` levels. It follows that there is a corresponding repulsion between the d-electrons and the ligands . If the d-electrons are symmetrically ARRANGED, they will repel all six ligands EQUALLY. THUS the STRUCTURE will be REGULAR octahedron. If the d-electrons are asymmetrically arranged, they will repel some ligands in the complex more than others. Thus the structure is distorted. Out of the given options, symmetrical arrangements are `: (b) t_(2g) ^(6) e_(g)^(2)` (c )`t_(2g)^(6)e_(g)^(4)` (d)`t_(2g)^(6) e_(g)^(0)` unsymmetrical arrangement is `: (a) t_(2g)^(6) e_(g)^(1)`
Discussion
9424.

Which of the statements is true regarding below reaction

Answer»

The number of INTERMEDIATES formed are 3.
Configuration at epoxy CARBON does not change.
Twostereogenic centres are formed in the EQUAL in the final product.
Reaction is 5th order.

Answer :A::C
Discussion
9425.

Which of the following pairs of amino acids are essential amino acids ?

Answer»

Phenyl ALANINE and Glutamine
Tryptophan and Histidine
Tryosine and Asparagine
ISOLEUCINE and ASPARTIC acid

Solution :Tryptophan and Histidine
Discussion
9426.

Which of the following graphs corresponds to first order reaction:

Answer»




ANSWER :A
Discussion
9427.

Unlike other halogens Fluorine does not show higher oxidation states because

Answer»

It is most electronegative
It has no d- orbital
Atomic RADIUS is smallest
All of above

Solution :Anamalous BEHAVIOUR of FLUORINE
Discussion
9428.

Write the structure of the major organic product in each of the following reactions: (i) CH_(3)CH_(2)CH_(2)Cl + NaI underset("heat")overset("acetone")(rarr)

Answer»

Solution :`underset(1-"iodopropane")(CH_(3)CH_(2)CH_(2)I)`
Discussion
9429.

Which of the following aqueous solution should have the highest boiling point ?

Answer»

`1.0 M NaOH`
`1.0 M Na_(2)SO_(4)`
`1.0 M NH_(4)NO_(3)`
`1 M KNO_(3)`

SOLUTION :Elevation is boiling point temperature `(DeltaT_(B))` is maximym for 1.0 M `Na_(2)SO_(4)` solution since it makes available maximum ins in solution.
Discussion
9430.

Which of the following is used as most sweetening agent ?

Answer»

Sucrose
Alitame
Caremel
Saccharin 

ANSWER :B
Discussion
9431.

Which of the followingis not physical method for preservationd ?

Answer»

Irradiation
Salting
Freezing
Heating

Answer :B
Discussion
9432.

Which of the following molecules does not have a chiral carbon atom?

Answer»

2, 2-Dimethyl-1-3-bromohexane
NEOPENTYL CHLORIDE
2- CHLOROBUTANE
Pentan-2-ol

Answer :B
Discussion
9433.

Which of the following on reaction with conc. NaOH gives an alcohol

Answer»

Methanal
Ethanal
Propanal
Butanal

Solution :`HCHO + HCHO OVERSET(NaOH)underset("CONC")RARR CH_(3)OH+HCOONa`
Discussion
9434.

Write down the reactions taking place in Blast furnace related to the metallurgy of iron in the temperature range 500-800K.

Answer»

SOLUTION :The REACTIONS are given as under :
`3Fe_(2)O_(3)+CO to 2Fe_(3)O_(4)+CO_(2)`
`Fe_(3)O_(4)+4CO to 3Fe+4CO_(2)`
`Fe_(2)O_(3)+CO to 2FeO+CO_(2)`.
Discussion
9435.

When the product is

Answer»




SOLUTION :
Discussion
9436.

Two substances A and B are present such that [A]=： 4 [B] and half life of A is 5 minute and of B is 15 minute. If they start decaying at the same time following first order, how much time later will the concentration of both of them would be same

Answer»

15 minute
10 minute
5minute
12 minute

Answer :A
Discussion
9437.

Write the structure of benzenediazonium chloride?

Answer»

SOLUTION :`C_(6)H_(5)-OVERSET(+)(N)-=NCl^(-)`
Discussion
9438.

Which of the following has the highest ionization potential

Answer»

Magnesium
Barium
Strontium
Calcium

Answer :A
Discussion
9439.

The structure formula of the compound isomeric with acetone is :

Answer»

`CH_3CH_2CHO`
`CH_3CHO`
`CH_3CH_2OH`
None

Answer :A
Discussion
9440.

The ultimate products oxidation of most of hydrogen and carbon in food stuffs are

Answer»

`H_(2)O` ALONE
`CO_(2)` alone
`H_(2)O` and `CO_(2)`
NONE of these

Answer :C
Discussion
9441.

Which one of the following is first member of monosaccharides ?

Answer»

`HOH_2C-OVERSET(O)overset(||)C-CH_2OH`
`HOH_2 C- CHOH - CHO`
`HOH_2C-CHOH - CHOH -CHO`
`HOH_2-CHOH-overset(O)overset(||)C-CH_2 OH`

ANSWER :B
Discussion
9442.

Which catalyst is used in preparation of Teflon ?

Answer»

ZIEGLER Natta
PERSULPHATE
Peroxide
ALKYL Lithium

SOLUTION :Persulphate
Discussion
9443.

Which of the following sequence is correct with reference to the oxidation number of iodine.

Answer»

`I_(2) gt ICI LT HI lt HIO_(4)`
`HIO_(4) lt ICI lt I_(2) lt HI`
`I_(2) lt HI, ICI lt HIO_(4)`
`HI lt I_(2) lt ICI lt HIO_(4)`

Solution :`HI lt I_(2) lt ICI lt HIO_(4)`
Discussion
9444.

Which is least basic? SbH_(3), PH_(3), NH_(3), AsH_(3) ?

Answer»

Solution :A compound which is most acidic is obviously least BASIC. Since `SbH_(3)` is most acidic, therefore, it is leat basic. Or As the SIZE of the atom increases, ELECTRON DENSITY DECREASES and hence basicity decreases. Thus `SbH_(3)` is least basic.
Discussion
9445.

Which of these can be used as moth repellant

Answer»

BENZENE hexachloride
Benzal chloride
Hexachloroethane
Tetrachloroethane

Answer :C
Discussion
9446.

Which of the following compound is produced when CH_2=CH-(CH_2)_2COOH reacts with HBr in presence of peroxides

Answer»

`CH_3CH(CH_2)_5COOH`
`BrCH_2CH_2(CH_2)_2COOH`
`CH_3CH_2CH_2(CH_2)_5COOH`
`CH_3CH_2BrCH_2CH_2COOH`

ANSWER :B
Discussion
9447.

Which is not a reducing agent?

Answer»

`Na_(2)S_(2)O_(3)`
`Na_(2)SO_(3)`
`Na_(2)S`
`K_(2)S_(2)O_(8)`

Answer :D
Discussion
9448.

Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution-

Answer»




Solution :The `-OCOCH_(3)` group, ATTACHED to the anomeric carbon in compound C, on hydrolysis in BASIC MEDIUM (aq. KOH), gets converted into `-OH` group. The `-OH`groups, present in the compound shows its reducing property.
Discussion
9449.

Which of the following ores is subjected to roasting during metallurgical operations for getting the metal oxide ?

Answer»

Zincite
Zinc blende
Malachite
Limonite

Answer :B
Discussion
9450.

What happens when an alkyl halide reacts with AgNO_2 and the product is reduced.

Answer»

Solution :PRIMARY AMINE is FORMED.
`R-X+ AgNO_2 overset(-AGX)rarr R-NH_2 overset(6H)rarr RNH_2`
Discussion