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25151.

The proper value of significant figures in 38.0+0.0035 +0.00003 is:

Answer»

38
38.0035
38.00353
38

Answer :D
Discussion
25152.

The proper rays for radiocarbon dating are

Answer»

UV-rays
IR-rays
Cosmic rays
X-rays

Solution :The radioactive isotope `._(6)C^(14)` is PRODUCED in the atmosphere by the action of cosmic RAY NEUTRONS on `._(7)N^(14)`
Discussion
25153.

The propellant in the proposed PSL V rocket of the Indian space programme shall consist of

Answer»

A composite solid propellant
Biliquid PROPELLANTS such as `N_(2)O_(4)` + unsymmetrical dimethyl HYDRAZINE (UDMH) and `N_(2)O_(4)` monomethyl hydrazine(MNH)
Both (a) and (b) in DIFFERENT stages of rocket propellant
kerosene and liquid oxygen

Answer :C
Discussion
25154.

The projectile, that experiences minimum repulsion on approaching a particular nucleus is

Answer»

NEUTRON
`ALPHA` -particle
Electron
`BETA` -particle

Answer :A
Discussion
25155.

The progressive warming up of the earth surface is mainly due to :

Answer»

AUTOMOBILE exhaust
Blanketing effect of CARBON DIOXIDE in atmosphere
Reforestation
Thickening of OZONE layer

Answer :B
Discussion
25156.

The progressive increase in the boilingpoints from CH_(3)Cl(249 K), CH_(3)Br (277 K) and CH_(3)I (316 K) is due to

Answer»

higher polarity of C - I bond and higher molar MASS
higher polarity of C - I bond and lower molar mass
lower polarity but higher molar mass in `CH_(3)I`
lower polarity and lower molar mass in `CH_(3)I`

SOLUTION :The boiling point of `CH_(3)I` is higher than `CH_(3)Cl` and `CH_(3)Br` because of higher molar mass yet it has low polarity of C - I bond.
Discussion
25157.

The progress of the reaction given below, CH_(3)COOC_(2)H_(5)+H_(2)Ooverset(H^(+))(to)CH_(3)COOH+C_(2)H_(5)OH can be followed by measuring the concentration of acid (HCl acid used as catalyst plus acetic acid formed during the reaction) by means of alkali titration. Find the volume of alkali (NaOH) needed for the end point that will increase with time.

Answer»

Solution :`{:(,CH_(3)COOC_(2)H_(5),+,H_(2)O,overset(H^(+))(to),CH_(3)COOH,+,C_(2)H_(5)OH),("At t=0",a,,"excess",,0,,0),("At t=t",a-x,,"constant",,x,,x),("At t=oo",0,,,,a,,a):}`
If `V_(0)`, `V_(t)` and `V_(oo)` are the volumes of `NaOH` solution needed for the end point of titration of the reaction mixture at zero time, time `t` and at infinity, i.e. after completion of the reaction-the CONDITION being achieved by HEATING the reaction mixture for some time, then
`V_(0) prop ["acid catalyst"]`
`V_(t) prop ["acid catalyst"]+x`
`V_(oo) prop ["acid catalyst"]+a`
`:.V_(00)-V_(t) prop a-x`
`V_(prop)-V_(0) prop a`
(since concentration of `HCl` acid acting as catalyst will remain constant).
The above reaction which is of first order (actually pseudo unimolecular) will, therefore obey following equation.
`k=(2.303)/(t)log.(V_(oo)-V_(0))/(V_(oo)-V_(t))`
Discussion
25158.

The progress of the reaction AiffnB , with time is presented in the figure. Determine (i) the value of n (ii) the equilibrium constant K (iii) the initial rate of conversion of A

Answer»

SOLUTION :
At equilibrium Rate (forward) = Rate (backward)
` = (0.6 - 0.3)/(5)= (0.6)/(5) XX 1/n`
For the eqb: `A IFF 2B, K =(0.6^2)/(0.3)`
Initial rate = change in concentration of A in the 1ST hour
2,1.2,0.1
Discussion
25159.

The products X and Y in the following reaction are R-CH_(2)NO_(2) underset((ii) R'Br)overset((i) OH)(rarr) X overset(TiCl_(3))(rarr) Y respectively,

Answer»

`R R'CHNO_(2), R R'CO`
`R R'CO, R R'CHNO_(2)`
`R R' CHNO_(2), RCH=NOR`
RCHNOR', R R'C=NOH_(2)`.

SOLUTION :
Discussion
25160.

The products X and Z in the following sequence are

Answer»

iso - porpyl benzene and ACETONE
CUMENE peroxide and acetone
iso - propyl benzene and iso - proyl ALCOHOL
PHENOL and acetone.

Solution :
Discussion
25161.

The products/s of the following reation is

Answer»




Solution :This is Baeyer Villager OXIDATION and the methyl GROUP has lower migrating TENDENCY.
Discussion
25162.

The products P and Q are

Answer»




ANSWER :D
Discussion
25163.

The products ofreaelion of alcoholic silver nitrite witht ethyl bromide are

Answer»

ethane
ethene
nitroethane
ethyl nitrite.

Solution :`C_(2)H_(5)Br+AgNO_(2)(ALC.)overset(Delta)(rarr)UNDERSET((70%-80))(C_(2)H_(5)NO_(2))+C_(2)H_(5)-underset((10-15%))(O-N)=O`
Discussion
25164.

The products of the reaction of two molecules of HCHO with struong potash is

Answer»

`CH_(3)OH " and "HCOOH`
`CH_(3) OH " and " HCOONa`
`CH_(3)OH " and "HCOOK`
`C_(2)H_(5)OH`

Solution :`2 HCHO + KOH to CH_(3)OH + HCOOK`
Discussion
25165.

The products of the reaction Al_4 C_3 + D_2O to …….+…… are :

Answer»

`C_2D_2 + AL(OD)_3`
`Al_2O_3 + C_2D_2`
`CD_4 + Al(OD)_3`
`C_2D_2 + Al(OD)_3`

ANSWER :C
Discussion
25166.

The products of the following reactions can be :

Answer»




SOLUTION :
Discussion
25167.

The products of the following reaction are SiO_(2)+C overset(Delta)to

Answer»

SIC and `CO_(2)`
SiO and CO
SiC and CO
Si and `CO_(2)`

SOLUTION :`SiO_(2) +3C OVERSET(Delta)toSiC +2CO`
Discussion
25168.

The products of the electrolysis of aq. Sodium chloride are

Answer»

SODIUM , CHLORIDE
chlorine , hydrogen
hydrogen, oxygen
hydrogen, chloride , hydroxyl ion

Solution : `H^(+)` ions migrate towards CATHODE FORMING `H_(2)`gas. `Cl^(-)`ions migrate towards anode forming `Cl_(2)` gas.
Discussion
25169.

The products of the electrolysis of concentrated aqueous solution of common salt are:

Answer»

`NA + Cl_2`
`H_2 + O_2`
`NAOH + H_2 + Cl_2`
`NaOH+ Cl_2 + O_2`

ANSWER :C
Discussion
25170.

The products of reaction of alcoholic silver nitrite with ethyl bromide are:

Answer»

Ethane
Ethene
Ethyl alcohol
Nitroethane

Answer :D
Discussion
25171.

The products of reaction of alcoholi silver nitrite with ethyl bromide are

Answer»

Ethane
Ethene
Nitroethane
Ethyl nitrite

Solution :Silver nitrite, being a salt of nitrous acid, occurs in twotautomeric forms.

In other words, `NO_(2)^(-)` ions from `AgNO_(2)^(-)` may exist in two tautomeric FROMS `-O-N = O`(Nitrite ion) forming alkyl nitrities and (nitro GROUP) forming nitroalkanes.
`2C_(2)H_(5)Br+2AgNO_(2) rarrC_(2)H_(5)NO_(2) + C_(2)H_(5)ONO + 2AgBr`
Discussion
25172.

The products of reactio of alcoholic silver nitrite with ethyl bromide are

Answer»

Ethane
Ethene
Nitroethane
Ethyl nitrite.

Solution :
Discussion
25173.

The products of oxidation of phosphorus acid by hot concentrated sulphuric acid are ...........and ............. .

Answer»

SOLUTION :`H_(3)PO_(4), SO_(2) and H_(2)O`, i.e., `H_(3)PO_(3) + H_(2)SO_(4) overset(Delta)rarr H_(3)PO_(4) +SO_(2)+H_(2)O`
Discussion
25174.

The products of combustion of an aliphatic thiol (RSH) at 298 K are :

Answer»

`CO_(2)(g),H_(2)O(g)" and"So_(4)(g)`
`CO_(2)(g),H_(2)O(L)" and"So_(4)(g)`
`CO_(2)(l),H_(2)O(l)" and"So_(4)(g)`
`CO_(2)(g),H_(2)O(l)" and"So_(4)(l)`

Solution :N//A
Discussion
25175.

The products of acid hydrolysis of P and Q can be distinguished by

Answer»

a. LUCAS reagent
b. `2, 4-DNP`
c.Fehling's solution
d.`NaHSO_(3)`

Solution :
Discussion
25176.

The products of acid hydrolysis of P and Q can be distinguished by

Answer»

LUCAS reagent
2,4-DNP
FEHLING's SOLUTION
`NaHSO_3`

ANSWER :C
Discussion
25177.

The products of combustion of an aliphatic thil (RSH)at 298K are:

Answer»

`CO_2(L),H_2O(G) and SO_2(g)`
`CO_2(g),H_2O(g) and SO_2(g)`
`CO_2(l),H_2O(l) and SO_2(g)`
`CO_2(g),H_2O(l) and SO_2(l)`

ANSWER :B
Discussion
25178.

The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are

Answer»

`Cl^(-) and CLO^(-)`
`Cl^(-) and ClO_(2)^(-)`
`ClO^(-) and ClO_(3)^(-)`
`ClO_(2)^(-) and ClO_(3)^(-)`

SOLUTION :With cold dilute aqueous NaOH, `Cl_(2)` FORMS CHLORIDE ion `(Cl^(-))` and HYPOCHLORITE `(OCl^(-))` ion.
`Cl_(2) + 2 OH^(-) rarr Cl^(-) + OCl^(-) + H_(2)O`
Discussion
25179.

The products obtained when benzyl phenylether is heated with HI in the mole rate 1:1 are. (1) Phenol. (2) benzyl alcohol, (3) benzyl,iodide, (4)Iodobenzene

Answer»

1AND 3only
3 and 4 only
1 and 4 only 2AND 4 only

Solution :NA
Discussion
25180.

The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are .........

Answer»

`CLO^(-)` and `ClO_(3)^(-)`
`ClO_(2)^(-)` and `ClO_(3)^(-)`
`Cl^(-)` and `ClO^(-)`
`Cl^(-)` and `ClO_(2)^(-)`

Solution :`Cl_(2) + underset("COLD and dilute")(2NAOH) to Cl^(-) + ClO^(-) + NA^(+) + H_(2)O`
Discussion
25181.

The products obtained when chlorine gas react with old and dilute aqueous NaOH are

Answer»

`ClO_(2)^(-)` and `ClO_(3)^(-)`
`CL^(-)` and `ClO^(-)`
`Cl^(-)` and `ClO_(2)^(-)`
`ClO^(-)` and `ClO_(3)^(-)`

Solution :`UNDERSET("Cold & DIL.")(Cl_2 + 2NaOH) to Cl^(-) + ClO^(-) +Na^(+) +H_(2)O`
Disproportional REACATION
Discussion
25182.

The products obtained when anisole is heated in a sealed tube with HI are

Answer»




None of these

Solution :When an alkyl aryl ether is heated with HI, halogen goes with alkyl GROUP. Therefore, heating anisole (methy phenyl ether ) with HI, PHENOL and METHYL IODIDE are OBTAINED.
Discussion
25183.

The product(s) obtained via oxymercuration (HgSO_(4) + H_(2)SO_(4)) of 1-butyne would be:

Answer»

`CH_3-CH_2-oversetoverset(O)(||)C-CH_3`
`CH_3-CH_2-CH_2-CHO`
`CH_3-CH_2-CHO+HCHO`
`CH_3CH_2COOH+HCOOH`

SOLUTION :`CH_3-CH_2-C-=CHunderset(H_2SO_4)OVERSET(HgSO_4, 60^@)to CH_3-CH_2-oversetoversetO(||)C-CH_3`
Discussion
25184.

The products obtained via oxymer curation (HgSO_(4)+H_(2)SO_(4)) of butyne would be

Answer»

`CH_(3)-CH_(2)-CO-CH_(3)`
`CH_(3)-CH_(2)-CH_(2)-CHO`
`CH_(3)-CH_(2)-CHO+HCHO`
`CH_(3)CH_(2)CO OH+HCO OH`

SOLUTION :Oxymercuration leads to hydration according to Markownikoff's RULE.
`CH_(3)CH_(2)C-=CH overset(HgSO_(4)+H_(2)SO_(4))to [CH_(3)CH_(2)overset(OH)overset(|)C=CH_(2)]toCH_(3)CH_(2)COCH_(3)`
Discussion
25185.

The products obtained on the ozonolysis of pent-2-ene are :

Answer»

PROPANAL and ETHANAL
Methanal and ethanal
PROPANOL and propanone
Ethanal and propanone

Solution :
Discussion
25186.

The product obtained on reaction of C_2H_5Cl with hydrogen over palladium carbon is

Answer»

`C_3H_8`
`C_4H_(10)`
`C_2H_6`
`C_2H_4`

SOLUTION :`C_2H_5Cl+H_2overset(PD)rarrC_2H_6+HCl`
Discussion
25187.

The productsobtainedin thereacton , C_(6)H_(5)CH_(2) -CH_(3) underset(273K)overset(Cl_(2)liv)to is / are :

Answer»

`C_(6)H_(5)CHCl-CH_(3)`
`C_(6)H_(5)CH_(2)-CH_(2)CL`
`C_(6)H_(5)C Cl_(2)-CH_(3)`
`C_(6)H_(5)CHClCH_(2)cl`

Answer :A,C
Discussion
25188.

The products obtained in the following reaction are underset(COOH)overset(CHO)(2|) underset(Delta)overset(NaOH)to

Answer»

`overset(CH_(2)OH)underset(COONa)(|)`
`overset(CH_(2)OH)underset(CH_(2)OH)(|)`
`overset(COONa)underset(COONa)(|)`
`CH_(3)-CH_(3)`

SOLUTION :This is an example of CANNIZZARO reaction.
`2underset(COOH)overset(CHO)(|) underset(Delta)overset(NaOH)to underset(COONa)overset(COONa)(|)+underset(COONa)overset(CH_(2)OH)(|)`
Discussion
25189.

The productsformedwhen themixtureof methane and steamis passedoverfinelydividednickelat 1273K, are :

Answer»

`CO_(2) andH_(2) `
CO and `H_(2) `
`CH_(3) OH andH_(2) `
noneof these

Answer :B
Discussion
25190.

The products obtained by means of HgSO_4 + H_2So_4 from 1-butyne would be :

Answer»

`CH_2CH_2CH_2CHO`
`CH_3CH_2COOCH_3`
`CH_3CH_2CHO + HCHO`
`CH_3CH_2COOH + HCOOH`

ANSWER :B
Discussion
25191.

The products formed when propene is ozonolysed are ......

Answer»

`HCHO + CH_3CHO`
`CH_3CHO`
`HCOOH + CH_3COOH`
`CH_3COCH_3`

SOLUTION :`HCHO + CH_3CHO`
Discussion
25192.

The products formed when CH_3I,CH_3CHO and CH_3CH_2COOH are respectively reduced by HI in presence of red phosphorus are-

Answer»

`CH_3CH_3,CH_3CH_3,CH_3CH_2CH_3`
`CH_4,CH_3CH_3,CH_3CH_2CH_3`
`CH_3CH_2CH_3,CH_4,CH_3CH_3`
`CH_4,CH_3CH_2CH_3,CH_3CH_2CH_2CH_3`

ANSWER :B
Discussion
25193.

The products formed when Cl_2 reacts with excess of NH_3 are

Answer»

`NCl_(3)+HCL`
`N_(2)+HCl`
`NCl_(3)+N_(2)`
`N_(2)+NH_(4)Cl`

ANSWER :D
Discussion
25194.

The products formed when bromocyclohexane and sodium propynide are heated together are

Answer»

1-cyclohexylpropyne
cyclohexene
propyne
2-cyclohexylpropyne

Answer :B::C
Discussion
25195.

The products formed on the cathode and the anode respectively on the electrolysis of an aqueous solution of MgSO_(4) between inert electrodes will be:

Answer»

`H_(2) (G) and O_(2) (g)`
`O_(2) (g) and H_(2) (g)`
`O_(2) (g) and MG(s)`
`O_(2) (g) and SO-(2) (g)`

ANSWER :C
Discussion
25196.

The products formed is/are

Answer»




ANSWER :A::B::C::D
Discussion
25197.

The products formed in the reaction of cumene with O_2followed by reactant with dil. HCl are :

Answer»




SOLUTION :
Discussion
25198.

The products formed in the reaction are (AAK_MCP_36_NEET_CHE_E36_006_Q01)

Answer»


(`AAK_MCP_36_NEET_CHE_E36_006_A01`)

ANSWER :B
Discussion
25199.

Complete the following equations: CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-O-CH_(3)+HI to

Answer»

`CH_(3)OH+ CH_(3)- UNDERSET(CH_(3))underset(|)overset(CH_(3))overset(|)C-I`
`CH_(4)+ H_(3)C- underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-OI`
`CH_(3)I+ CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-OH`
`CH_(3)OI+ H_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-H`

Solution :When one of the alkyl group is tertiary, the alkyl halide is formed from the tertiary alkyl group.
`underset(underset("ether")("tert-Butymethyl"))(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-OCH_(3))+HI overset(373 K)RARR underset(underset("alcohol")("Methyl"))(CH_(3)OH)+underset("tert-Butyl iodine")(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-I)`
Discussion
25200.

The products expected to be formed in the Wurtz reaction of a mixture of neopentyyl bromide and isobutyl bromide are (i) 2,2,4-trimethylpentane (ii) 2,2,5,5-tetramethylhexane (iii) 2,2,4,4-tetramethylhexane (iv) 2,5-dimethylhexane (v) 2,2,5-trimethylhexane

Answer»

(ii), (iii) and (v)
(ii), (iv) and (v)
(i), (iv) and (v)
(i), (iii) and (v)

Solution :`underset("NEOPENTYL bromide (A)")(CH_(3)-underset(CH_(3))underset(|)OVERSET(CH_(3))overset(|)(C)-CH_(2)Br)+underset("ISOBUTYL bromide (B)")(BrCH_(2)-overset(CH_(3))overset(|)(C)H-CH_(3)) underset(("WURTZ reaction"))overset("Na/dry ether, "Delta)to underset("2,2,5,5-Tetramethylhexane (ii) (DIMERIZATION product of A)")(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(.^(@)C)-CH_(2)-CH_(2)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(.^(5)C)-CH_(3))+underset("2,5-Dimethylhexane (v) (Dimerization product of B)")(CH_(3)-overset(CH_(3))overset(.^(2)C)H-CH_(2)-CH_(2)-overset(CH_(3))overset(.^(5)C)H-CH_(3))`
`underset("2,2,5-Trimethylhexane (iv) (Cross product of A and B)")(+CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(.^(2)C)-CH_(2)-CH_(2)-overset(CH_(3))overset(|)(.^(5)C)H-CH_(3))`
thus, option (b) is correct.
Discussion