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17651.

The reduction of CH_3-CH_2-C equiv N with sodium and alcohol results in the formation of

Answer»


`CH_3-CH_2-CH_2-OH+N_2`
`CH_3-CH_2-CH_2-NH_2`
`CH_3-CH_2-NH_2`

ANSWER :C
Discussion
17652.

Whichvitamin deficiencyleads to the diseaseosteomalacia ?

Answer»

VITAMIN D
Vitamin A
Vitamin C
Vitamin K

ANSWER :A
Discussion
17653.

Which compound gives dye tests ?

Answer»

METHYLAMINE
ANILINE
Diphenylamine
Benzoic acid

Answer :B
Discussion
17654.

When the zinc electrode having reduction potential – 0.76 V is attached to NHE, will it act as anode or cathode?

Answer»

Solution :Since REDUCTION POTENTIAL is negative, OXIDATION will OCCUR at this electrode. It will ACT as anode.
Discussion
17655.

Total number of electrons present in 11.2L of NH_(3) at STP is:

Answer»

`6.02xx10^(23)`
`3.01xx10^(23)`
`3.01xx10^(24)`
`5.1xx10^(24)`

ANSWER :C
Discussion
17656.

There is no effect of ........ on the motion of gas molecules.

Answer»

SOLUTION :(a) 352
(B) 1.632
Discussion
17657.

Which solids behave like super cooled liquid ?

Answer»

SOLUTION :AMORPHOUS SOLIDS
Discussion
17658.

Write the names and structures of the monomers in the following polymers : (i) Buna-S (ii) Nylon 6, 6 (iii) Bakelite

Answer»

SOLUTION :(i) Buna-S

(ii) NYLON 6, 6
`underset("Adipic ACID")(HOOC(CH_(2))_(6)COOH)+underset("Hexamethylenediamine")(H_(2)N(CH_(2))_(6)NH_(2))`
(iii) Bakelite
Discussion
17659.

What is the difference between multimolecular and macromolecular colloids ? Give one example of each. How are associated colloids different from these two types of colloids ?

Answer»

Solution :Depending upon the type of the particles of the dispersed phase, colloids are classified as: multimolecular, macromolecular and associated colloids.
(i) Multimolecular colloids: On dissolution a large number of atoms or smaller molecules of a substance aggregate together to form species having size in the colloidal range `(1-1000 nm)`. The species thus formed are called multimolecular colloids. For example, a GOLD solution may contain particles of various sizes having many atoms. Sulphur sol consists of particles containing a thousand or more of Sg sulphur molecules. 
(ii) Macromolecular colloids : Macromolecules in suitable solvents form solutions in which the size of the macromolecules may be in the colloidal range. Such system are called macromolecular colloids. These colloids are quite stable and resemble true solutions in many RESPECTS. Examples of NATURALLY occurring macromolecules are starch, cellulose, proteins and enzymes and those of man-made macromolecules are polythene, nylon, polystyrene, synthetic rubber etc.
(iii) Associated colloids (Micelles) : There are some substances which at low concentrations behave as normal strong electrolytes, but at higher concentration exhibit colloidal behaviour due to the formation of aggregates.
The aggregrated particles thus formed are called micelles. These are also known as associated colloids. The formation of micelles takes place only above a particular temperature called Kraft temperature `(T_(k))` and above particular concentration called critical MICELLE concentration (CMC).
On dilution, these colloids revert back to individual ions. Surface active agents such as soaps and synthetic detergents belong to this class.
For soaps the CMC is `10^(-4)` to `10^(-3) mol L^(-1)`. These colloids have both lyophobic and lyophilic parts. Micelles may contain as many as 100 molecules or more.
Discussion
17660.

The size of I, I^(+) and I^(-) follows the order:

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`I^(+)GTI^(-)gtI^(-)`
`I^(-)gtI^(+)gtI`
`I^(-)gtIgtI^(+)`
`I^(+)gtIgtI^(-)`

ANSWER :C
Discussion
17661.

Total no of lone pairs in all atoms of Cl_(2)O.

Answer»


SOLUTION : TOTAL no of LONE PAIR = 8
Discussion
17662.

What is the product formed when propene is hydrolysed in the presence of mineral acid?

Answer»

PROPAN-1-OL
Propan - 2- ol
Iso BUTYL alcohol
2-methyl-propan-2-ol

SOLUTION :Propan - 2- ol
Discussion
17663.

What is Addition Polymerization ? Explain the mechanism of Addition Poly- merization.

Answer»

Solution :Addition Polymerization :
In this type of polymerization, the molecules of the same monomer or different monomers add together on a large scale to form a polymer.
The monomers used are unsaturated compounds, e.g., alkenes, alkadienes and their derivatives.
This mode of polymerization leads to an increase in chain length and chain growth can take place through the formation of either free radicals or ionic species.
Free RADICAL mechanism : A variety of alkenes or dienes and their derivatives are polymerized in the presence of a free radical generating initiator (catalyst) LIKE benzoyl peroxide, acetyl peroxide, tert-butyl peroxide, etc.
For EXAMPLE, the polymerization of ethene to polythene consists of heating or exposing to light a mixture of ethene with a small amount of benzoyl peroxide initiator.
The PROCESS starts with the addition of phenyl free radical FORMED by the peroxide to the ethene double bond thus generating a new and larger free radical. This step is called chain initiating step.

`overset(*)C_(6)H_(5)+CH_(2)=CH_(2)rarrCH_(6)H_(5)-CH_(2)-overset(*)CH_(2)`
As this radical reacts with another molecule of ethane , another bigger sized radical is formed. The repetition of this sequence with new and bigger sized radicals carries the reaction forwoord and the step is termed as chain propagating step.
Chain Propagating step :
`C_(6)H_(5)-CH_(2)-overset(*)CH_(2)+CH_(2)=CH_(2)rarr C_(6)H_(5)-CH_(2)-CH_(2)-overset(*)CH_(2)rarr C_(6)H_(5)+CH_(2)CH_(2)+""_(n)CH_(2)-overset(*)CH_(2)`
Ultimately, at some stage the product radical thus formed reacts with another radoical to form the polymerized product. This step is called the chain the Chain terminating step.
Chain terminating step
`C_(6)H_(5)(--CH_(2)-CH_(2)--)_(n)CH_(2)-overset(*)CH_(2)`
`C_(6)H_(5)(--CH_(2)-overset(+)CH_(2)--)_(n)CH_(2)-overset(*)CH_(2)rarrC_(6)H_(5)(--CH_(2)-CH_(2)--)_(n)CH_(2)-CH_(2)-CH_(2)-CH_(2)(--CH_(2)-CH_(2)--)_(n)C_(6)H_(5)`
Discussion
17664.

The unit of equilibrium constant for the reaction , H_2+I_2 hArr 2HI IS :

Answer»


ANSWER :D
Discussion
17665.

The shape of XeF_6 is,

Answer»

SQUARE planar
Distorted octahedral
Square pyrimidal
Pyramidal

SOLUTION :
Discussion
17666.

Write the chemical equation for the following: Ca_(3)(PO_4)_2 + SiO_(2) + C overset("heat") rarr

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SOLUTION :`Ca_(3)(PO_4)_2 + 6SiO_2 + 10 C rarr 6CaSiO_3 + P_4 + 10CO`
Discussion
17667.

Which of the following statements(s) is (are) correct ?

Answer»

A PLOT of log `K_(P)` VERSUS `1//T` is linear
A plot of log `[X]` versus time is linear for a first order reaction , `X`, `P`
A plot of log `P` versus `1//T` is linear at constant temperature
A plot of `P` versus `1//V` is linear at constant temperature

Answer :A::B::D
Discussion
17668.

The reagent for the above conversion is:

Answer»

ALCOHOLIC KOH
alcoholic KOH followed by `NaNH_(2)`
aqueous KOH followed by `NaNH_(2)`
`Zn//CH_(3)C OOH`.

Solution :.
Discussion
17669.

What information can be obtained on the structure of alkene on ozonolysis ?

Answer»

Solution :The reaction between an ALKENE and OZONE results in the formation of ozonide which upon reduction gives the formation of carbonyl compound. Such a reaction is called ozonolysis. Analysing the final carbonyl products the POSITION of double bond in an alkene can be established. For example : Ethylene on ozonolysis, FOLLOWED by the reduction gives formaldehyde.
Discussion
17670.

Which of the following statement is correct:- As the %s- character of a hybrid orbital decreases

Answer»

The BOND angle decreases
The bond STRENGTH increases
The bond length decreases
Size of ORBITAL decreases

Solution :Bond angle `prop %` .s. CHARACTER
Discussion
17671.

Which of the following statement is not correct? (1) La(OH)_(3) is less basic than Lu(OH)_(3) (2) In lanthanide series ionic radius of Ln^(3+) ions decrease (3) Zn, Cd, Hg are colourless and are diamagnetic (4) Mn shows maximum oxidation state is +7

Answer»

Solution :Key:1
`La(OH)_(3)` is more basic than `LU(OH)_(3)`. This is because ionic SIZE of `La^(3+)` ION is more than `Lu^(3+)ion`.
Discussion
17672.

What is distillation ?

Answer»

SOLUTION :Electro-refining : Principle - It is APPLIED for metals like Cu, AL, Zn, Pb, Sn, etc.
Discussion
17673.

What are enzymes ?

Answer»

Solution :ENZYMES are biological catalysts. Each biological catalysts. Each biological system requires a different enzyme. Thus, as compared to conventional catalysts , enzymes are very specific are very specific and efficient in their action . They are required in onyl small quantity and work at optimum temperature (310K) and p H (7-4) under one atmosphere pressure. Chemically , they are globular proteins. However, some enzyme are ALSO associated with some non- protein component called the COFACTOR for their acitivity. Cofactors are two types :
(a) Inorganic ions such as `Zn^(2+),Mg^(2+),Mn^(2+),Fe^(2+),CU^(2+),Co^(2+)`, etc.
(b) Organic molecules : These are also of two types.
(i) Coenzymes : These are usually derived form vitamins such as thaimine , riboflavin , niacin , etc. They are loosley held to the protein and can be easily spearted by dialysis.
(ii) Prosthetic GROUP : These are also derived from vitamin such as biotin but are tightly held to the protein molecule by covalent bonds. Thet can be spearated only by careful hydrolysis.
Discussion
17674.

Which of the following can work as dehydrating agent for alcohols :

Answer»

`H_2SO_4`
`AI_2O_3`
`H_3PO_4`
All

Answer :D
Discussion
17675.

The smallest ketone and it's functional isomere are reated with NH_(2) - OH to form oxime

Answer»

TWO DIFFERENT OXIME are formed
three different oxime are formed
two OXIMES are OPTICALLY active
all oximes are optically active

Answer :A
Discussion
17676.

Which of the following ion is not present aq. Sloution of potash alum?

Answer»

`K^(+)`
`AI^(3+)`
`NH_(4)^(+)`
`SO_(4)^(2-)`

SOLUTION :`K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`
Discussion
17677.

Two liquids A and B form an ideal solution. At 300 K, the vapour pressure of a solution containing 1 mole of A and 3 moles of B is 550 mm of Hg. At the same temperature, if one mole of B is added to this solution, the vapour pressure of the solution increases by 10 mm of Hg. Determine the vapour pressure of A and B in their pure states

Answer»


ANSWER :400, 600
Discussion
17678.

Which solution will show highest resistance during the passage of current:

Answer»

`1NNaCI`
`0.1NNaCI`
`2NNaCI`
`0.05NNaCI`

ANSWER :C
Discussion
17679.

Which metal in the first series of transition metals exhibits (+1) oxidation state most frequently and why?

Answer»

Solution :Cu exhibits (+1) oxidation state in first transition ELEMENTS because after loss of one ELECTRON, STABLE configuration is attained i.e., `d^(10)` configuration.
Discussion
17680.

Which of the following pairs of structures represents facial and meridional isomers (geometrical iosmers) respectively ?

Answer»




ANSWER :A
Discussion
17681.

Which of the following has lowest pK_b value ?

Answer»

pyrrole
aniline
cyclohexylamine
diphenylamine

Answer :C
Discussion
17682.

Which metal is extracted by electrolytic reduction methoed

Answer»

Cu
Al
Fe
Ag

Answer :B
Discussion
17683.

Whichone of the followingreactionswill not yielda carboxylicacid?

Answer»

`RMGX + CO_(2) to`
`PhOH +CHCl_(3) + NAOH to `
`PhCN + H_(3)O to `
`PhOH + NaOH + CO_(2) to `

Answer :B
Discussion
17684.

What happens when Phenol is heated with NH_3 ?

Answer»

SOLUTION :
Discussion
17685.

Which statements are correct about MIC (methyl isocyanate, Me-N=C=O).

Answer»

`MIC` is preparedbyt the reaction of `MeNH_(2)` and `COCl_(2)` (phosgene).
HYDROLYSIS of `MIC`gives `(Me-NH-overset(O)overset(||)(C)-OH)` as the intermediate, which gives `MeNH_(2)` and `CO_(2)` on further hydrolysis.
`MIC` is used to prepare insecticide, carbaryl under the commercial name Sevin.
, bond TAKES part when `1`-naphthol is reacted with `MIC` beacause `N` is more basic and nucleophilic.

Solution : Note : In `CH_2 + C= O, R-C-= N, R- N C= =O `, and `R- N = C=S, NA` reaction OCCURS .
(B) .
Discussion
17686.

When mercuric iodide is added to the aqueous solution of potassium iodide, then:

Answer»

FREEZING POINT is raised
freezing point is lowered
freezing point does not change
boiling point does not change

Solution :KI REACTS with `HgI_(2)` to form a complex as
`2KI+HgI_(2)rarrK_(2)[HgI_(4)]overset("ionizes")rarr`
`underset("4 ions")ubrace(2K^(+)+2I^(-))""underset("3 ions")ubrace(2K^(+)+HgI_(4)^(2-))`
Thus, NUMBER of ions decreases in the solution. Hence depression in freezing point is LESS, i.e., actual freezing point is raised.
Discussion
17687.

Which of the following is a chain growth polymer ?

Answer»

STARCH
Nucletic acid
POLYSTYRENE
Proteins

Answer :C
Discussion
17688.

What is the pH value of (N)/(100) KOH solution

Answer»

`10^(-11)`
3
2
11

Solution :`10^(-3) N KOH` will GIVE `[OH^(-)] = 10^(-3) M`
POH = 3
`because pH + pOH = 14, pH = 14 - 3 = 11`.
Discussion
17689.

What should be the considerations during the extraction of metals by electrochemical method?

Answer»

Solution :The FOLLOWING factors should be KEPT in MIND to ENSURE proper precautions :
(i) Reactivity of the metal.
(ii) Suitability of the ELECTRODE.
Discussion
17690.

Which of the following is most stabls ?

Answer»

`HF`
HI
HCl
HBr

Answer :A
Discussion
17691.

Which of the following does not contain number of neutrons equal to that of ._(18)^(40Ar

Answer»

`._(19)^(41)K`
`._(21)^(43)Sc`
`._(21)^(40)Sc`
`._(20)^(42)Ca`

Solution :`._(18)^(40)Ar` has `40 - 18 = 22` neutrons
While `._(21)^(40)Sc " has " 40 - 21 = 19` neutrons
Discussion
17692.

Which one of the following on oxidation will not give a carboxylic acid with the same number of carbon atoms

Answer»

`CH_(3)COCH_(3)`
`C CI_(3)CH_(2)CHO`
`CH_(3)CH_(2)CH_(2)OH`
`CH_(3)CH_(2)CHO`

Solution :`CH_(3)-overset(O)overset(||)(C )-CH_(3) underset(H_(2)SO_(4))overset(K_(2)Cr_(2)O_(7))rarr CH_(3)COOH + HCOOH`
One carbon atom is LESS in the ketone group
Discussion
17693.

What type of hybridisation of 'C' and 'O' in ether ?

Answer»

SP
`sp^(2)`
`sp^(3)`
`DSP^(2)`

SOLUTION :`sp^(3)`
Discussion
17694.

Which of the following is the smallest cation?

Answer»

`NA^(+)`
`Mg^(2+)`
`CA^(2+)`
`Al^(3+)`

ANSWER :D
Discussion
17695.

Vincyl chloride reacs with HCl to form

Answer»

1,1-dichloro ETHANE
1,2-dichloro ethane
Tetrachloro ethylene
Mixture of 1,2 and 1,1-dichloro ethane

Solution :`CH_(2)=CH-Cl+HCl to UNDERSET("1,1-dichloro ethane")(CH_(3)-CHCl_(2))`
Discussion
17696.

Write important functions of lipids.

Answer»


Answer :(a) Fats and OILS ACT as HEAT insulators and shock absorbers for the organisms.
(b) Fats and oils are the GREATEST energy reservoirs.
Discussion
17697.

Which of the following species is the least stable ?

Answer»

`O_(2)`
`O_(2) ^(-2)`
`O _(2) ^(+1)`
`O_(2) ^(-1)`

ANSWER :B
Discussion
17698.

Under hydrolytic conditions, the compounds used for preparation of linear polymer and for chain termination, respectively, are

Answer»

`CH_(3)SiCl_(3)` and `Si(CH_(3))_(4)`
`(CH_(3))_(2)SiCl_(2)` and `(CH_(3))_(3)SICL`
`(CH_(3))_(2)SiCl_(2)` and `CH_(3)SiCl_(3)`
`SiCl_(4)` and `(CH_(3))_(3)SiCl`

ANSWER :B
Discussion
17699.

Which one of the following is always not negative

Answer»

ENTHALPY of combustion
Enthalpy of formation
Enthalpy of NEUTRALISATION
LATTICE enthalpy

Answer :B
Discussion
17700.

The value of rate constant of a pseudo first order reaction……

Answer»

depends on the CONCENTRATION of REACTANTS PRESENT in SAMLL amount
depends on the concentratin of reactants present in excess
is INDEPENDENT of the concentration of reactants
depends only on temperature.

Solution :The reaction of hydrolysis of ethyl acetate is as follows.
`CH_(3)COOC_(2)H_(5)+underset("Excess")(H_(2)O)overset(H^(+))to`
`CH_(3)COOH+C_(2)H_(5)OH`
This reaction is pseudo first order and its rate does not depends on`H_(2)O` as the concentration of `H_(2)O` remain almost constant.
Rate=K`[CH_(3)COOC_(2)H_(5)]`
Where ,k=`k_(1)[H_(2)O]`=constant
In this way the reactant of first order depends on the reactant which is in less proportion.
So (A) is correct.
Discussion