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3351.

t_(x//y) = time in which x//y fraction of reactant converts into product. {:(,"Column-I",,"Column-II"),("(a)",t_(5//9),,(p)Equal t o 54 sec if t_(1//3) "is 18 sec in case of first order reaction"),("(b)",t_(19//27),,(q)Equal t o 32 sec if t_(1//14) "is 16 sec in case of first order reaction"),("(c)",t_(7//8),,(r)Equal t o 56 sec if t_(1//3) "is 4 sec in case of second order reaction"),("(d)",t_(7//16),,(t)Equal t o 30 sec if t_(1//3) "is 18 sec incase of zero order reaction"),(,,,(t)Equal t o 28 sec if t_(1//2) "is 16 sec in case of zero order reaction"):}

Answer»


ANSWER :(a-s);(b-p);(c-r,t);(d-p)
Discussion
3352.

Which of the following liquid pairs shows a negative deviation from Raoult's law ?

Answer»

Water-nitric acid
Benzene-methanol
Water-hydrochloric acid
Acetone-chloroform.

Answer :B
Discussion
3353.

Which of the following can show geometrical isomerism.

Answer»


ANSWER :(III), (iv), (VI), (vii) and (viii)
Discussion
3354.

Which of the following will react with boiling NaOH solution to give a gas with rotten fish smell?

Answer»

<P> `P_(4)`
 `(P_(4))_(N)`
 Zn
AI

Answer :A
Discussion
3355.

What will be the mass of one .^(12)C atoms in g?

Answer»

SOLUTION :`"1 mol of ".^(12)C" ATOMS "=6.022xx10^(23)" atoms = 12 g"`
THUS, `6.022xx10^(23)` atoms of `.^(12)C` have mass = 12 g
`therefore"1 atoms of ".^(12)C" will have mass"=(12)/(6.022xx10^(23))g=1.9927xx10^(-23)g`
Discussion
3356.

Which of the following disaccharide has different type of linkage ?

Answer»

MALTOSE
GALACTOSE
Starch
Sucrose

Answer :D
Discussion
3357.

The simplest formula of a compound containing 50% of element X (at. mass 10) and 50% of element Y (at. mass 20) is :

Answer»

`X_2Y`
`XY_2`
`X_2Y_3`
`XY`

SOLUTION :
FORMULA `X_2Y`
Discussion
3358.

What are ideal and non-ideal solutions ? Explain non-ideal solution showing positive deviations ?

Answer»

Solution :CHARACTERISTICS of an ideal solution
(1) It must obey Raoult.s law (2) `Delta `H (mix) = 0
(3)`Delta `V (mix) = 0
Cause of positive deviations from Raoult.s law. Consider a binary solution having components A and B. If the A B interactions in the solution are weaker than the A-A and B-B interactions in the two liquids forming the solution, then the escaping tendency of A and B types of MOLECULES from the solution becomes

more than pure liquids. As a result each component of the solution has a partial vapour pressure greater than expected on the basis of Raoult.s law. The total vapour pressure will be greater than the corresponding vapour pressure expected in case of ideal solution of the same composition. This type of behaviour of solution is described as positive deviations from Raoult.s law. This may be expressed as
`P_A gt P_(A)^(@)x_A`
or ` P_Bgt P_(B)^(@) x_(B)`
The positive deviations have been shown in Fig. In the figure, DOTTED lines show the ideal behaviour. Explanation for positive deviations. Let us consider a solution of ethanol and cyclohexane. In ethanol, the molecules are held together due to hydrogen bonding as shown below.

On adding cyclohexane, the cyclohexane molecules come in between the molecules of ethanol, and break the hydrogen bonds. As the resulting solution has weaker INTERMOLECULAR attractions decreases, therefore the escaping tendency of alcohol and cyclohexane molecules from the solution increases. Hence the vapour pressure of the solution is greater than the vapour pressure as expected from Raoult.s law
Discussion
3359.

Which one of the following represents Ohm's law?

Answer»

`V = IR`
`R = I/V`
`I = V/R`
`R = VI`

ANSWER :A
Discussion
3360.

Tollen's reagent is _________

Answer»

AMMONIACAL CUPROUS chloride
ammoniacal cuprous oxide
ammoniacal SILVER NITRATE
ammoniacal silver chloride

Answer :C
Discussion
3361.

What is hetergeneous catalysis ? Give an example.

Answer»
Discussion
3362.

Which of the following are benzylic alcohols ?

Answer»

`C_(6)H_(5)-CH_(2)-CH_(2)OH`
`C_(6)H_(5)-CH_(2)OH`
`C_(6)H_(5)-underset(CH_(3))underset("|")"CH"-OH`
`C_(6)H_(5)-CH_(2)-underset(CH_(3))underset("|")"CH"-OH`

Answer :B::C
Discussion
3363.

What happens when anisole is nitrated ?

Answer»

SOLUTION :When anisole is TREATED with a MIXTURE of conc. `HNO_(3)`and conc. `H_(2)SO_(4)`, it gives a mixture of ortho and para nitro anisole.
Discussion
3364.

The unit of ionic product of water K_(w) are

Answer»

`MOL^(-1) L^(-1)`
`Mol^(-2) L^(-2)`
`Mol^(-2) L^(-1)`
`Mol^(2) L^(-2)`

ANSWER :D
Discussion
3365.

What happens when the following compounds are treated with dilute NaOH solution in cold? propanal

Answer»

Solution :PROPANAL :
`underset("Propanal")(2CH_(3)-CH_(2)-CHO)underset("Aldol CONDENSATION")OVERSET("Dil "NAOH)tounderset("3-hydroxy-2-methyl pentanal")(CH_(3)-CH_(2)-underset(OH)underset(|)(CH)-underset(CH_(3))underset(|)(CH)-CHO)`
Discussion
3366.

Write the reaction of Williamson synthesis of 2-ethoxy-3-methylpentane starting from ethanol and 3-methylpentan-2-ol.

Answer»

Solution :For WILLIAMSON synthesis, the alkyl halide should be primary (unhindcred or least HINDERED). Thus, the alkyl halide should be DERIVED from ethanol and the alkoxide ion from 3-methylpentan-2-ol. The complete synthesis is as follows :
`underset("Ethanol")(CH_(3)CH_(2)OH)+HBr OVERSET(Delta)rarr underset("Bromoethane")(CH_(3)CH_(2)Br)+H_(2)O`
`underset("3-Methylpentan-2-ol")(2overset(5)CH_(3)overset(4)CH_(2)-overset("3")underset(CH_(3))underset("|")"CH"-underset(CH_(3))underset("1|")overset("2")"CH"-OH+Na)rarr2CH_(3)CH_(2)-underset(CH_(3))underset("|")"CH"-underset(CH_(3))underset("|")"CH"-O^(-)Na^(+)+H_(2)`
Discussion
3367.

Which one is synthetic sweetener ?

Answer»

Aspartame
Sucralose
Alitame
All of the GIVEN 

SOLUTION :All of the given
Discussion
3368.

What happens when chlorobenzene and benzene is treated together in the presence of AICI_(3)?

Answer»

SOLUTION :No REACTION
Discussion
3369.

Which of the following properties decrease from top to bottom down the group in case of hydrides of oxygen family members?

Answer»

Dipole moment
Bond angle
Covalent character
 Thermal stability

Solution :Dipole moment, bond angle and thermal stability decrease from top to bottom down the group in case of hydrides of group 16 elements. Dipole moment and bond angle decrease DUE to decrease in ELECTRONEGATIVITY of the central ATOM and thermal stability decreases due to weakening of the M-H bond as the size of the central atom INCREASES from top to bottom.
Discussion
3370.

When MnO_(2) is fused with KOH in air, it gives

Answer»

`KMnO_(4)`
`Mn_(3)O_4`
`K_(2)MnO_(4)`
`Mn(OH)_(2)`

Answer :C
Discussion
3371.

The total pressure of a mixture of H_2 and O_2is 1.0 bar. The mixture is allowed toreact to form water, which is completely removed to leave only pure H_2at a pressure of 0.35 bar. Assuming ideal gas behaviour, and that all pressure measurements were made under the same temperature and volume conditions, calculate the composition of the original mixture.

Answer»

SOLUTION :0.78, 0.22
Discussion
3372.

underset(("organic compound"))A+O_(2) rarrX+Y+Z Compound(A) in pure form does not give ppt. with AgNO_(3) solution. A mixture containing 70% of (A) and 30% of ether is used as an anaesthetic. Compound (X) and (Y) are oxides while (Z) is a pungent smelling gas. (X) is a neutral oxide which turns cobalt chloride parper pink. Compound (Y) turns lime water milky and produces an acidic solution with water. Compound (A),(X),(Y) and (Z) respectively will be:

Answer»

`CH_(4),H_(2)O,CO_(2),Cl_(2)`
`CHCl_(3),H_(2)O,CO_(2),Cl_(2)`
`CH_(3)OH,H_(2)O,CO_(2),N_(2)`
`NH_(2)CONH_(2),H_(2)O,N_(2)O,CO_(2)`

ANSWER :B
Discussion
3373.

Which of the following compounds is not cleaved by HI even at 525 K

Answer»

'
`(Ph)_(2)O`
`C_(6)H_(5)OCH_(3)`
`C_(6)H_(5)OC_(3)H_(7)`

Answer :B
Discussion
3374.

Which of the following represent pair of homologue.

Answer»




SOLUTION :Homologue usually vary by a single PARAMETER such as the LENGTH of a carbon CHAIN having same general formula.
Discussion
3375.

Which one among the following pairs of ions cannot be separated by H_2S in dilute hydrochloric acid?

Answer»

 `Bi^3+``Sn^2+`
` AI^(3+) Hg^(2+)`
`Zn^(2+)CU^(2+)`
`Ni^(2+),Cu^(2+)`

Answer :A
Discussion
3376.

What weight of solute (M. wt. 60) is required to dissolve in 180 g of water to reduce the vapour pressure to 4//5th of pure water?

Answer»


ANSWER :`150 G`;
Discussion
3377.

Which is the suitable condition for "Industrially ammonia gas is manufactured by Haber's process"?

Answer»

210 BAR pressure, 773 K, [FEO]
230 bar pressure, 770 K, [`Fe_3O_4]`
200 bar pressure, 773 K, [FeO]
220 bar pressure, 770 K, [`Fe_2O_3]`

ANSWER :C
Discussion
3378.

When propylene reacts with HBr in the presence of a peroxide the product formed is :

Answer»

N- PROPYL alcohol
propylene peroxide
n-propyl bromide
Isopropyl bromide

Answer :C
Discussion
3379.

Which of the following will not form yellow precipitates with alkaline iodine solution ?

Answer»

Ethanol
Isopropyl ALCOHOL
ISOBUTYL alcohol
Acetone

Solution :Isobutyl alcohol
Discussion
3380.

Which one of the following is not an element

Answer»

Diamond
Graphite
Silica
Ozone

Answer :C
Discussion
3381.

The simplest amino acid is

Answer»

alanine
valine
tyrosine
glycine

Answer :D
Discussion
3382.

Which of the following pairs is an intensive property ?

Answer»

DENSITY, VISCOSITY
Surface tension, mass
Viscosity, internal ENERGY
HEAT capacity, volume

Answer :A
Discussion
3383.

The tocicity order of CH_3OH,C_2H_5OH and C_3H_7OH is:

Answer»

`C_2H_5OH LT CH_3OH lt C_3H_7OH`
`C_3H_7OH lt C_2H_5OH lt CH_3OH`
`C_2H_5OH lt C_3H_7OH lt CH_3OH`
`CH_3OH lt C_2H_5 lt C_3H_7OH`

ANSWER :C
Discussion
3384.

Which of the following haloakane undergoes nucleophilic substitution reaction by SN^(2) mechanismonly

Answer»

`CH_(3)Br`
`CH_(3)CHBrCH_(3)`
`C_(2)H_(5)CHBrCH_(3)`
`(CH_(3))_(3)CBr`

Solution :In `SN^(2)` reaction,the reactivity of HALOAKANE occurs in the order`CH_(3) gt 1^(@) gt 2^(@) gt 3^(@)`. The determiningfactor issteric hindrance in the caron atom of alkyl group attached to halogen atom. There isminimum steric hindrace offerex by TEH hydrogenes to the APPROACH of nucleophilie ATTACKING at the carobon of C-Br bond.
Discussion
3385.

What is the purest allotropic form of amorphous carbon?

Answer»

SOLUTION :LAMP BLACK,
Discussion
3386.

Write the name and structure formula of the dibromobenzene which forms three mononitro compounds.

Answer»

SOLUTION :
Discussion
3387.

Which one is not an organometallic compound?

Answer»

RMgX
`(C_(2)H_(5))_(4)PB`
`(CH_(3))Sn`
`C_(2)H_(5)O Na`

Solution :`C_(2)H_(5)ONA` doesn't have carbon-metal bond.
Discussion
3388.

Which of the following combination is correct?

Answer»

`(IV),(III),(S)`
`(IV),(ii),(S)`
`(III),(ii),(Q)`
NONE of these

ANSWER :D
Discussion
3389.

Which of the following is a neutral complex?

Answer»

`[PT(NH_(3))_(2)Cl_(2)]`
`[CO(NH_(3))_(6)]Cl_(3)`
`[Ni(NH_(3))_(6)]Cl_(2)`
`K_(4)[Fe(CN)_(6))]`

Solution :`[Pt(NH_(3))_(2)Cl_(2)]` carry no net charge hence it is neutral complex.
`[Co(NH_(3))_(6)] ltimplies [Co(NH_(3))_(6)]^(3+) + 3CL^(-)`
`[Ni(NH_(3))_(6)]Cl_(2) ltimplies [Ni(NH_(3))_(6)]^(2+) + 2Cl^(-)`
Cationic complexes.
`underset("Anionic complex")(K_(4)Fe(CN_(6)) ltimplies 4K^(+) + [Fe(CN)_(6)]^(4-)`
Discussion
3390.

Write the reactions involved in the following reactions: (i) Clemmensen reduction (ii) Cannizzaro reaction

Answer»

SOLUTION :(i)
(II)
Discussion
3391.

Two reactions, (i) A toproducts and (ii) B toproducts , follow first order kinetics. The rate of the reaction (i) is doubled when the temperature is raised from 300K to 310K. The half life for this reaction at 310K is 30 minutes. At the same temperature B decomposes twice as fast as A. If the energy of activation for the reaction (i) is half that of reaction (ii) calculate the rate constant of the reaction (ii) at 300K.

Answer»


ANSWER :`0.327min^(-1)`
Discussion
3392.

When 96500 coulombs of electricity are passed through barium chloride solution, the amount of barium deposited will be

Answer»

0.5 mol.
1.0 mol.
2.0 mol.
4.0 mol.

Solution :96,500 C will DEPOSIT 0.5 mol of `Ba^(+2)` as Barium is divalent METAL.
Discussion
3393.

Write thebalancexd chemicalequationfor the following i. Silver chloride is reacted with equation sodium cyanide and theproductthusformedis allowedto react withzinein an alklinemedium . ii Cobalt (II) solutionreacts with KNO_(2) in acetic acidmedium

Answer»

SOLUTION :Silver goes into the coplex and then it is DISPLACED with zine
`AgCI + 2NaCN rarr NaCI + Na[AG(CN)_(3)]`
`2Na[Ag(CN)]_(2) + Zn rarr Na_(2)(CN)_(4)] + 2Ag darr `
II. A yellowprecipitateis formed
`KNO_(2) + CH_(2)COOH rarr CH_(2)XCOOK + HNO_(2)`
`CoCI_(2) + 2KNO_(2) rarr Co(NO_(2))_(2) + 2KCI`
`Co(NO_(2))_(2)+ 2HNO_(2) rarr Co(NO_(2))_(3) + NO + H_(2)O`
`Co(NO_(2))_(3) + 3KNO_(2) + K_(2)[Co(NO_(2))_(6)]`
Discussion
3394.

Which element has smallest atomic radius?

Answer»

SOLUTION :HYDROGEN
Discussion
3395.

Which crystal has the largest lattice energy?

Answer»

KCI
MgO
LiBr
NaF

Answer :B
Discussion
3396.

White phosphorus is kept under

Answer»

cold water
ammonia
alcohol
Kerosene.

Solution :WHITE phosphorus burns spontaneously in air and is, THEREFORE, STORED under water.
Discussion
3397.

Name two photochemical oxidants.

Answer»


ANSWER :A::C::D
Discussion
3398.

Which pair of electrolytes could not be distinguished by the products of electrolysis using inert electrodes ?

Answer»

1 M `CuSO_(4)` solution, 1 M `CuCl_(2)` solution
1 M KCl solution, 1 M KCl solution
1 M `AgNO_(3)` solution, 1 M NACL solution
1 M KCl solution, 1 M NaCl solution

Solution :(d) Electrolysis of both KCl and NaCl solutions liberates `H_(2)` at the cathode and `Cl_(2)` at the anode. Thus, the distinction cannot be made by the gases evolved at the two ELECTRODES. However, resulting solutions will be different. KOH in case of KCl and NaOH in case of NaCl.
Discussion
3399.

Which of the following solution gives precipitate with Pb(NO_(3))_(2) but not with Ba(NO_(3))_(2)

Answer»

Sodium chloride
Sodium sulphite
Sodium nitrate
Sodium hydrogen phosphate

Solution :`PbCI_(2)` is insoluble in cold water but SOLUBLE in HOT water.
Discussion
3400.

When acetophenone is reacted with hydrazine in presence of slightly acidic medium, what will be the product? How many isomers can be generated? When these isomers will react with PC l_(5), what will be the possible product in the reactions?

Answer»

Solution :
It will GIVE two ISOMERS (A) and (B)
Now, reaction of A with `PCl_(5)` will give the following PRODUCT
Discussion