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1551.

The solubility of Agcl (K_sp=1.2xx10^(-10)) in a 0.10 M NaCl solution is :

Answer»

0.1 M
`1.2 xx10^(-6)` M
`1.2 xx10^(-9)` M
`1.2 xx10^(-10)` M

Answer :C
Discussion
1552.

Which of the following is the least reactive towards nucleophile?

Answer»

`{:(CH_3CH_2CH(CH_3)CH_2NH_2),(""darrNH_3),(CH_3CH_2CH(CH_3)CH_2Br):}`
`CH_3CHOoverset(HCN)rarrCH_3CH(OH)CN`
`CH_3CH=CH_2overset(H_2"O"//H^+)rarrCH_3CH(OH)CH_3`
`RCHO+R'MgX rarrRCH(OH)R'`

Solution :`CH_3-CH_2-overset(CH_3)overset(|)(CH)-CH_2Br+NH_3rarrCH_3-CH_2-overset(CH_3)overset(|)(CH)-CH_2+NH_2` reaction is an example of NUCLEOPHILIC substitution reaction.
Discussion
1553.

Water and hydrogen peroxide illustrate the law of:

Answer»

RECIPROCAL proportion
MULTIPLE proportion
constant PROPOTION
definite composition

Solution :reciprocal proportion
Discussion
1554.

Which of the following metals will give H_2 on reaction with NaOH.

Answer»

MG
BA
CA
Sr

Answer :A
Discussion
1555.

Which one among the following non-metals liquid at 25^@C

Answer»

Bromine
Carbon
Phosphorus
Sulphur

Solution :Bromine is a LIQUID at ROOM TEMPERATURE.
Discussion
1556.

Which of the following potassium compounds is known as "Pearl ash"

Answer»

`KOH`
`KMnO_(4)`
`K_(2)CO_(3)`
`K_(2)SO_(4)`

Answer :C
Discussion
1557.

Which of the following is not Lanthanides?

Answer»

CURIUM
Thulium
Promethium
Terbium

Answer :A
Discussion
1558.

What amount of dioxygen (in gram) contains 1.8xx10^(22) molecules?

Answer»

9.6
0.096
`96.0`
`0.960`

ANSWER :D
Discussion
1559.

The reduction of nitrobenzene with Zn and KOH (aq.)

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Benzene
Aniline
Hydroazobenzene
None

Answer :C
Discussion
1560.

Which two of the following salts are used for preparing iodized salt? (i) KIO_(3), (ii) KI (iii) I_(2) (iv) HI

Answer»

(i) and (ii)
(i) and (iii)
(ii) and (iv)
(iii) and (iv)

SOLUTION :When traces of IODIDE in the form of `K10_(3)`KI is added to the SALT, iodised salt is obtained.
Discussion
1561.

What is determined by Ultra-centrifuge technique in polymers ?

Answer»

SOLUTION
MOLECULAR MASS
Precipitate
CONCENTRATION

Solution :Molecular mass
Discussion
1562.

Which one of the following methods is neither meant for the synthesis nor for separation of amfoes?

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Hinsberg method
Hofmann method
Wurtz REACTION
Curtius reaction

Solution :In Wurtz reaction, alkyl halide REACTS with sodium METAL in the presence of DRY ETHER to give alkane.
Discussion
1563.

Which of the following statements regarding DNA fingerprinting is incorrect?

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It is used in forensic LABORATORIES for identification of criminals.
It cannot be altered by surgery
It is different for every CELL and cannot be altered by any known TREATMENT
It is used to determine paternity of an individual.

Solution :DNA fingerprinting is same for every cell and cannot be altered by any known treatment
Discussion
1564.

What is the change in internal energy when a gas contracts from 377 ml to 177 ml under a constant pressure of 1520 torr, while at the same time being cooled by removing 124 J heat ? [Take : (1 L atm) = 100 J]

Answer»

`-24 J`
`-84J`
`-164J`
`-248J`

ANSWER :B
Discussion
1565.

Which of the following methods will give allyl chloride?

Answer»

Reaction of propane with HCl
Ethylene DICHLORIDE is heated in a high TEMPERATURE FURNACE in the presence of charcoal
Propene is heated to `400-600^(@)C` in the presence of chlorine
ACETONE is treated with `PCl_(5)`

Answer :C
Discussion
1566.

What is the value of i when solute is associated and dissociated ?

Answer»

SOLUTION :`ilt 1` when SOLUTE is associated and `igt 1` when solute is dissociated .
Discussion
1567.

What is the number of possible isomers for the octahedral complex [Co(NH_(3))_(2)(C_(2)O_(4))_(2)] ?

Answer»

1
2
3
4

Solution :It exists as cis and TRANS GEOMETRICAL ISOMERS. The cis ISOMER will have an OPTICAL isomer. Thus , there will be there isomers. For details , consult section 9.7
Discussion
1568.

When KOH solution is added to potassium dichromate solution,the colour of solution changes to yellow because :

Answer»

chromate ION changes to dichromate ion
dichromate ion changes to chromate ion
oxidation NUMBER of chromium changes from +6 to +4
oxidation number of chromium changes from +4 to +6

Answer :A::B::C::D
Discussion
1569.

Two isomeric mononitro derivaters (B) and (C) are obtained by the nirtration of an organic compound (A), C_(7) H_(8)O. Treatment of (A0 with acetyl chloride products (D) which on reaction with CrO_(2)Cl_(2) gives (E) whose oxidation with neutralKMnO_(4) followed by acidification gives (F). Compound (F) on heating gives pheonl. (A) on treatmentwith alkaline C_(6) H_(5)SO_(2)Cl produces. (A) on treatmentwith alkaline C_(6) H_(5) SO_(2)Cl produces (G) which on oxidiation with KMnO_(4)gives (H). Hydrolysis of (H) also gives (F). Give teh structures of (A) to (H).

Answer»

SOLUTION :The REACTION SUGGEST that `(A)` is
Discussion
1570.

Zeta potential (or electrokinetic potential) is the a. Potential required to bring about coagulation of a colloidal sol. b. Potential required to give the particles a speed of 1cms^(-1) in the sol.

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Solution :The potential DIFFERENCE that EXISTS between the stationary layer of compensating charges and the diffuse layer (present is the body of the solution) is CALLED zeta potential or electrokinetic potential.
Discussion
1571.

Which of the following statement is incorrect about the equation? C_(2)H_(5)OH(l)+3O_(2)(g) to 2CO_(2)(g)+3H_(2)O(l),Delta_(r)H^(-)=-1367" kJ "mol^(-1)

Answer»

the reaction is endothermic in nature.
The numerical value of `Delta_(r)H^(ө)` refers to the number of moles of SUBSTANCES specified by an equation. Standard enthalpy change `Delta_(r)H^(ө)` will have units as kJ `mol^(-1)`
The coefficients in a balanced thermochemical equations refer to the number of moles (never molecules) of reactants and products involved in the reaction
The equation describes the combustion of liquid ETHANOL at constant temperature and pressure.

Solution :`C_(2)H_(5)OH(l)+3O_(2)(g)to2CO_(2)(g)+3H_(2)O(l)`
`Delta_(r)H=-1367" kJ "mol^(-1)`
The above equation describes the combustion of liquid ethanol at constant temperature and pressure. The negative sign of enthalpy change INDICATES that this is an exothermic reaction.
Discussion
1572.

Which of the following is amphoteric oxide ? Mn_(2)O_(7),CrO_(3), Cr_(2)O_(3), CrO, V_(2)O_(3), V_(2)O_(4)

Answer»

`V_(2)O_(5), Cr_(2)O_(3)`
`Mn_(2)O_(7), CrO_(3)`
`CRO, V_(2)O_(5)`
`V_(2)O_(5), V_(2)O_(4)`

Solution :Oxides in the lower oxidation state are basic and those in higher oxidation state are acidic while in INTERMEDIATE state, they are amphoteric.
Discussion
1573.

The unit of cell constant of a conductivity cell is _____________.

Answer»

SOLUTION :`CM^(-1)`
Discussion
1574.

When a system is at equilibrium.

Answer»

1. The concentration of reactants and products BECOMES equal
2. The opposite reactions (FORWARD and BACKWARD) stop
3. The RATE of backward reaction becomes very low
4. The rate of forward and backward reactions become equal.

Answer :D
Discussion
1575.

Which of the following is not applicable to Nylon-6, 6 ?

Answer»

SYNTHETIC polymer
fibre
ADDITION polymer
Condensation polymer

Answer :D
Discussion
1576.

Which of the following statements are applicable to a balanced chemical equation of an wlwmwntry reaction ?

Answer»

ORDER is same as molecularicty.
Order is LESS than the MOLECULARITY.
Order is GRATER than the molecularity.
Molecularity can NEVER be zero.

Answer :A::D
Discussion
1577.

What istheroleofastabilizerin frothfloatationprocess?

Answer»

SOLUTION :CHEMICAL compoundslikecresols and anilinewhichtendtostabilizethefrotharecalledfrothstabilizers.
Discussion
1578.

which of the following acid will be formed only when P_2O_3?

Answer»

`HPO_3`
`H_4P_2O_7`
`H_3PO_4`
`H_3PO_3`

Solution :`P_2O_3+3H_(2)O RARR 2H_(3)PO_(3)`
Discussion
1579.

The sweeteners value of aspartame in comparison to canesugar is

Answer»

550
100
600
2000

Answer :B
Discussion
1580.

Which of the following belong to the class of natural polymers:

Answer»

Proteins
Cellulose
Rubber
All of the above

Answer :D
Discussion
1581.

Which of the following statements is not correct :-

Answer»

Oxidising power `=SiCl_(4) lt SnCl_(4) lt PbCl_(4)`
The ionic character of lead (II) halide decreases with increase in atomic number of halogen.
Melting POINT and boiling point of halogen increases down the group due to increase in London-dispersion force.
The liquification of Noble GASES decreases down the group.

Solution :(i) `Si^(+4) lt SN^(+4) lt Pb^(+4)`[due to inert pair effect]
(ii) size of halogen `(uarr)`
= polarisiation `(uarr)`
= ionic character `(darr)`
(iv) Liquification of nobel gases increases down the group, due to increasing in London force.
Discussion
1582.

Which among the following metals crystallise as a simple cube ?

Answer»

Polonium
IRON
Copper
Gold

Solution :Polonium is a radiactive element having two metallic allotropic forms , `ALPHA-" form "andbeta-` form. Out of these two forms, `alpha` - Po form CRYSTALLISES as simple cubic crystal. Copper and gold crystallises in FACE centred cubic crystal and iron crystallises in BODY centred cubic crystal and iron crystallises in body centred cubic crystal .
Discussion
1583.

The specific gravity of H_(2)SO_(4) after complete discharging becomes

Answer»

1.17
1.1215
0.115
0.1215

Solution :SPECIFIC GRAVITY DECREASES from 1.2 to 1.17 g/ML.
Discussion
1584.

Which compound shows S_(N)1 mechanism as well as optical isomerism ?

Answer»

BENZYL CHLORIDE
Allyl chloride
1-Bromo-1-phenylethane
2-Chlorobutane

Answer :C
Discussion
1585.

Which of the following reacts with nitrous acid

Answer»

Acetamide
2-Nitrobutane
2-methyl-2-nitropropane
Diethylamine

Solution :tert-Nitro compounds `(Me_(3)CNO_(2))` do not react with `HONO` because they do not have any `alpha-H`. The THREE OTHERS react with HONO as usual.
`underset(2^(@)"Nitroalkane")overset(C_(2)H_(5))overset(||)(CH_(3)CHNO_(2))overset(HONO)rarrunderset("Pseudonitrol(blue)")overset(N=O)overset(|)((CH_(3))_(2)CNO_(2))`
Discussion
1586.

What volume of 0.8 M solution contains 0.1 mole of solute

Answer»

500 ml
125 ml
0.125 ml
100 ml

Answer :C
Discussion
1587.

Which of the following is not correct in case of boron nitride ?

Answer»

It is also called borazon
It is CHEMICALLY UNREACTIVE
It is hard because it has DIAMOND LIKE structure
It has magnetic properties

Answer :D
Discussion
1588.

Which diagram is correct for (9)/(4) oxygen shared per tetrahedra?

Answer»




ANSWER :A
Discussion
1589.

When primary bromides are treated with a solution of Nal in pure acetone preciptate generates within 3 minutes at 25^(@)C whereas primarychlorides when treated with same reagent precipitate generates within 6 minutes at 50^(@)C. Explain.

Answer»

Solution :The reaction is probably of the `S_(N)2` type involving a bimolecular attack of the iodide ion upon the carbon atom CARRYING the chloride or BROMINE. Now `BR^(-)` is better leaving group when `Cl^(-)` (as it is a weaker base). So the rate of the reaction for bromides is faster.
`{:(RBr+Nal to Rl+NaBr downarrow),(RCl+Nal to Rl +NACL downarrow):}`.
Discussion
1590.

Use of chloropicrin is as……………..

Answer»

explosive
dye
anaesthetic
sterilizing agent

Answer :D
Discussion
1591.

Write rate law and order of the following reaction :AB+C_2 to AB_2C+C (slow) AB_2+C to AB_2C (fast)

Answer»

SOLUTION :RATE =`K[AB][C_2]`, ORDER =1+1=2
Discussion
1592.

Total number of optical active stereoisomers of the following compound is : CH_(3)-CH=CH-CHCI-CH=C=CH-CH=CH-CH_(3)

Answer»

8
6
16
10

Answer :C
Discussion
1593.

What type of isomers are the following [Co("en")_(3)]Cr(CN)_(6)]and[Cr("en")_(3)][Co(CN)_(6)]

Answer»

Co-ordination
Ionisation
Linkage
All above

Answer :B
Discussion
1594.

Which of the following compounds is used as refrigerant ?

Answer»

CARBON tetrachloride
Acetone
Carbon TETRAFLUORIDE
Dichlorodifluoromethane

Answer :D
Discussion
1595.

What is the role of adding an electrolyte in peptisation ?

Answer»

Solution : IONS of ONE type are adsorbed on the precipitates. On shaking the precipitates are converted into COLLOIDS DUE to repulsion between the particles carrying the same charge.
Discussion
1596.

Write the IUPAC name of CH_(3)-C-=C-CH_(2)-overset(O)overset(||)(C)-OH

Answer»

SOLUTION :Pentan-3-yne-oic ACID.
Discussion
1597.

Which of the following hydrocarbons has the lowest dipole moment

Answer»


`CH_(3)-HC = HC - CH_(3)`
`CH_(3)-CH_(2)CH=CH_(2)`
`CH_(2)=CH-CH=CH_(2)`

SOLUTION :For `CH_(3)-CH=CH_(3), mu = 0`, because this MOLECULE is asymmetrical planar.
Discussion
1598.

Using the calculated emf value of zinc and copper electrode, calculate the emf of the following cell at 25^(@)C. Zn(s)abs(Zn^(2+)(aq, 1M))abs(Cu^(2+)(aq, 1M))Cu(s)

Answer»

Solution :`Zn_((s))abs(Zn_(AQ, 1M)^(2+))abs(Cu_(aq, 1M)^(2+))Cu_((s))`
`E_(Zn//Zn^(2+))^(@)=0.76 V`
`E_(CU^(2+)|Cu)^(@)=0.34V`
`E_("Cell")^(@)=E_("ox")^(@)+E_("red")^(@)`
`""=0.76+0.34`
`E_("Cell")^(@)=1.10V`
Discussion
1599.

Time required to decompose SO_(2)Cl_(2) to half of its initial amount is 60 minutes. IF the decomposition is a first order reaction. Calculate the rate constant of the reaction.

Answer»

SOLUTION :`0.01155 MIN^(-3)`
Discussion
1600.

Which of the following is the correct order of flocculating for the coagulation of positive ion ?

Answer»

`[FE(CN)_(6)]^(4-) GT SO_(4)^(2-) gt Cl^(-) gt PO_(4)^(3-)`
`PO_(4)^(3-) gt [=E(CN)_(6)]^(4-) gt SO_(4)^(2-) gt Cl^(-)`
`[Fe(CN)_(6)]^(4-) gt PO_(4)^(3-) gt SO_(4)^(2-) gt Cl^(-)`
None of these

Answer :C
Discussion