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11301.

Thermal stability of hydrides of group-16 elements decreases down the group. Why? Why ICl is more reactive than I_(2) ?

Answer»

Solution :Because down the GROUP `E-H` BOND dissociation enthalpy DECREASES.
Because `I-Cl` bond is WEAKER than `I-I` bond.
Discussion
11302.

Which one of the following is an example of coordination isomerism ?

Answer»

`[Co(NH_(3))_(5)Br]SO_(4)" and "[Co(NH_(3))_(5)SO_(4)]Br`
`[Co(NH_(3))_(5)NO_(2)]Cl_(2)" and "[Co(NH_(3))_(5)ONO]Cl_(2)`
`[Co(H_(2)O)_(6)]Cl_(3)" and "[CR(H_(2)O)_(6)CL]Cl_(2).H_(2)O`
`[Co(NH_(3))_(6)][Co(CN)_(6)]" and "[Co(NH_(3))_(6)][Cr(CN)_(6)]`

Answer :D
Discussion
11303.

The solubility of a substance in ether is 2.0 xx10^(-3)M .The distribution coefficient of the substance in ether - water mixture is 4. The solubility of the substance in ether is

Answer»

`3.0xx10^(-4)M`
`5.0xx10^(-4)M`
`6.0xx10^(-4)M`
`8.0xx10^(-4)M`

SOLUTION :`("Solubility in ether")/("Solubility in WATER")="K(distribution COEFF.)"therefore""(2xx10^(-3)M)/(S)=4 "or"S=5xx10^(-4)M`
Discussion
11304.

The relation between mole fraction ((N_(E))/(N_(T))) and temperature is explain by Boltzmann and Maxwell graph.

Answer»

Solution :When the temperature is raised,the maximum of the curve move to the higher energy value and the curve broadens out i.e. spreads to the right such that there is a greater proportion of molecules with mcuh higher energies .

Mole fraction and Temperature:
The area under the curve must be constant since total probability must be ONE all times.
ACCORDING to figure,increasing the temperature of the substance increase the fraction of molecules ,Which collide with energies greater than `E_(a)`
It is clear from the diagram that in the curve at (t+10),the area showing the freaction of molecules having energy EQUAL to or greater than activation energy GETS doubled leading to doubling the RATE of reaction.
Discussion
11305.

Which is most viscous ?

Answer»

`CH_3OH`
`C_2H_5OH`
`HO-CH_2-CH_2-OH`
NONE of these

Answer :C
Discussion
11306.

Write theh chemical reaction associated withthe ''brown ring test''

Answer»

Solution :Brown ringtestis donefor the DETECTIONOF nityrate .To a solutioncomtainingthe SALT and fresbilyprepared ferric solutionsalphideconcetratedsulphiruicacidisaddedgraduallyalongth ea sides of thetube .Abrown appears to the junctionof the twoliquid .
`NO_(3)^(Theta) + 3Fe^(2+) RARR NO + 3Fe^(2+) + 2H_(2)O`
`[Fe(H_(2)O)_(6)]^(2+) +NO rarr underset("Brown")([Fe(H_(2)O)_(5)NO]^(2+))+H_(2)O`
Discussion
11307.

What is the electronic configuration of Mn^(2+)

Answer»

`[Ne]3d^(5)4S^(0)`
`[Ar]3d^(5)4s^(2)`
`[Ar]3d^(5)4s^(0)`
`[Ne]3d^(5)4s^(2)`

Solution :ELECTRONIC configuration of Mn(25) is
`1s^(2)2s^(2)2p^(6)3S^(2)3p^(6)4s^(2)3d^(5)`
`therefore"Electronic configuration of Mn"^(2+)` is
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(0)3d^(5)`

`therefore [Ar]3d^(5)4s^(0).`
Discussion
11308.

Which one of the following is correct ? Due to continous use of calcium superhosphates as feritlizer in soil thepH of soil becomes

Answer»

more than 7
LESS than 7
EQUAL to 7
cannot be PREDICTED

Solution :The PH of soil become adidic i.e less than 7
Discussion
11309.

Which of the following statements is/are correct regarding the given reaction? xCu_3P + CrO_(7)^(2-)toCu^(2+)+H_3PO_4 +Cr^(3+)

Answer»

<P>Cuin ` Cu_3` PIS oxidisedto `Cu^(2+)` and Pin`Cu_3`P isalsooxidised to ` PO_(4)^(3-)`
Cuin `Cu_3`P isoxidisedto `Cu^(2+)`wheres PIn`Cu_3 `Pis reducesto `H_3PO_4`
11electrons areinvolvedin theconversionof`Cu_3 P " to"Cu^(2+)andH_3PO_4 `
the valueof Xis6.

Solution :`4H_2 O +overset(+1) CU_3overset(-3) Pto3Cu^(2+) +H_3 overset(+5) PO_4 + 11 e ^(-)+ 5 H^+xx 6`
Discussion
11310.

The temperature coefficient for most of the reactions lies between :

Answer»

2 and 3
1 and 2
3 and 4
10 .

ANSWER :A
Discussion
11311.

What are plastics and plasticisers ?

Answer»

Solution :Substances like polythene and polyvinyls are COMMONLY called PLASTICS. They are usually addition VINYL POLYMERS. They are familiar for their flexibility and softness. Substances added to plastics to impart VISCOSITY, flexibility and other properties to the finished products are called plasticisers.
Discussion
11312.

Which of the following has the highest value of radioactivity?

Answer»

1 G of Ra
1 g of `RaSO_(4)`
1 g of `RaBr_(2)`
1 g of `Ra(HPO_(4))`

ANSWER :a
Discussion
11313.

Which compound on reductive ozonolysis forms only glyoxal:

Answer»

Ethyne
Ethene
Ethane
1,3-butadiene

Answer :C
Discussion
11314.

When acetaldehyde is reacted with LiAlH_(4), what is the product formed?

Answer»

`CH_(3)COOH`
`CH_(3)-CH_(2)-OH`
`CH_(3)-OH`
HCOOH

Answer :B
Discussion
11315.

When ethanol mixes in cyclohexane, cyclohexane reduces the intermolecular forces between ethanol molecule. In this, liquid pair shows

Answer»

Positive deviation by Raoult's LAW
Negative deviation by Raoult's law
No deviation by Raoult's law
DECREASE in VOLUME

Answer :A
Discussion
11316.

Which of the following electrolytes is most effective in the coagulation of gold sol?

Answer»

`NaNO_3`
`K_4[FE(CN)_6]`
`Na_3PO_4`
`MgCl_2`

SOLUTION :`K_4[Fe(CN)_6]`
Discussion
11317.

Which of the following is the strongest Lewis base ?

Answer»

`H_2O`
`CH_3OH`
`CH_3OCH_3
`C_6H_5OH`

ANSWER :C
Discussion
11318.

what must be the concentration of aqueous of NH_(3) which must be added to a solution containing 4xx10^(-3)M Ag^(+) and 0.001M NaCl to prevent the precipitaion of AgCl.

Answer»

Solution :Silver ion concentration which can be ALLOWED to remain in the solutions
`1.8xx10^(-10)=[AG^(+)][CI^(-)]`
`[Ag^(+)]=(1.8xx10^(-10))/(0.01)=1.8xx10^(-7)M`
This quantity is so small that almost all the `Ag^(+)` ion will be consumed by `NH(3)` in COMPLEX formation.
`{:(,Ag^(+)+,2NH_(3)hArr,[Ag(NH_(3))_(2),]^(+),K=(10^(8))/(6)),(t=0,4xx10^(-3),b,0,),(at eq,1.8xx10^(-7),(b-8xx10^(-3)),4xx10^(-3),):}`
Discussion
11319.

Which of following radius order is not correct?

Answer»

`Ti lt Zr ~~HF`
`Sc lt Y ~~LA`
`B lt Al ~~ Ga lt In ~~ Tl`
`O lt N lt S lt P`

ANSWER :B
Discussion
11320.

Which of the following groups is an auxochrome?

Answer»

`-OCH_(3)`
`-OH`
`-N(CH_(3))_(2)`

Solution :`GT C = N` is not an auxochrome.
Discussion
11321.

Which of the following can be measured by the Ostwald - Walker dynamic method ?

Answer»

VAPOUR pressure of the solvent
Relative lowering of vapour pressure
Lowering of vapour pressure
All of these

Solution :Oatwald - WALKER DYNAMIC method is used for measurement for relative lowering of vapour pressure.
Discussion
11322.

What is the covalency of nitrogen in N_(2)O_(5)?

Answer»

Solution :
Covalency DEPENDS upon the number of shared pair of electrons. Now in `N_(2)O_(5)`, each NITROGEN atom has four shared pairs of electrons as shown below :

THEREFORE, the covalency of N in `N_(2)O_(5)` is 4.
Discussion
11323.

Which of the following structure is more stable?

Answer»




Solution :Structure (b) is more stable because here negative CHARGE is DISPERSED to the maximum EXTENT as it is present on the CARBON atom bearing an ELECRON withdrawing `(-NO_2)` group.
Discussion
11324.

What is meant by activity of a catalyst?

Answer»

Solution :Ability of a CATALYST to ACCELERATE CHEMICAL REACTION is called its activity.
Discussion
11325.

What are the units of the molal depression constant for water?

Answer»

Solution :The UNITS of `K_f` are K KG MOL`""^(-1)` or Km`"^(-1).`
Discussion
11326.

What happens when alpha-particle is emitted

Answer»

Mass NUMBER DECREASES by 12 unit, ATOMIC number decreases by 4 unit
Mass number decreases by 4 unit, atomic number decreases by 2 unit
Only mass number decreases
Only atomic number decreases

Solution :`ALPHA-`particles is `._(2)He^(4)`
Discussion
11327.

Which of the following complexes show geometrical as well as optical isomerism ? (i) [Cr(o x)_(3)]^(3-) (ii) [Rh (e n)_(2)Cl_(2)]^(+) (iii) [Co(NH_(3))_(2)Cl_(2)(e n)]^(+) Select the correct code

Answer»

(i) only
(i) & (II) only
(ii) & (III) only
(i), (ii), & (iii)

ANSWER :C
Discussion
11328.

Which of the following processes is used in the extractive metallurgy of magnesium ?

Answer»

FUSED SALT electrolysis
Self reduction
Aqueous solution electrolysis
Thermite reduction.

Solution :A fused salt electrolysis is used for the extraction of MAGNESIUM from magnesium chloride.
Discussion
11329.

What are biodegradable and non-biodegradable detergents ? Give one example of each.

Answer»

Solution :Detergents having straight HYDROCARBON chains are easily degraded (or decomposed) by microorganism and HENCE are called biodegradable detergents while detergents containing BRANCHED hydrocarbon chains are not easily degraded by the MICROORGANISMS and hence are called non-biodegradable detergents. Non-biodegradable detergents accumulate in rivers and waterways thereby causing water pollution. Examples of biodegradable detergents are Sodium lauryl sulphate and sodium dodecyl benzenesulphonate. An example of non-biodegradable detergent is sodium 4-(1, 3, 5, 7-tetramethyloctyl) benzenesulphonate.
Discussion
11330.

Which of the following is hetero polysaccharide?

Answer»

Starch
Heparin
CELLULOSE
GLYCOGEN

ANSWER :B
Discussion
11331.

Write the IUPAC name of [Ni(H_(2)O)_(6)](CIO_(4))_(2).

Answer»

SOLUTION :Hexaaquanickel(II) CHLORATE.
Discussion
11332.

Write the name of different types of ligands.

Answer»

SOLUTION :(i) Monodentate ligands
(II) BIDENTATE ligands(IV) HEXADENTATE ligands.
Discussion
11333.

Which one of the following statements is correct

Answer»

The oxidation nubember of OXYGEN in `KO_(2)` is zero
The specific conductance of an electrolyte solution decreases with INCREASE in DILUTION
`Sn^(2+)` OXIDISES `Fe^(3+)`
`Zn//ZnSO_(4)` is a reference electrode

Answer :B
Discussion
11334.

What are the major products of the following :

Answer»


SOLUTION :N//A
Discussion
11335.

Which of the following pair of ions have same outer electronic configuration

Answer»

`Ce^(+4),LU^(+3)`
`Ce^(+4),EU^(+2)`
`Eu^(+2),GD^(+2)`
`Eu^(+2),Gd^(+3)`

ANSWER :D
Discussion
11336.

The relation between molecularweight (M) and vapour density (VD) is :

Answer»

`M = 2.5 XX VD`
`M = 2 xx VD`
`M = 0.5 xx VD`
M = VD

Answer :B
Discussion
11337.

Which process is not represented correctly-

Answer»




ANSWER :A::C
Discussion
11338.

Write structure and IUPAC names of (i) The amide which gives propanamide by Hofmann bromamide reaction. (ii) the amine produce by the Hofmann degradation of benzamide.

Answer»

Solution :(i). PROPANAMINE CONTAINS three carbon atoms, therefore, the amide molecule must contain four carbon atoms. THUS, the structure and IUPAC name of the amide containing four carbon atoms is
`UNDERSET("Butanamide")(CH_(3)-CH_(2)-CH_(2)-overset(O)overset(||)(C)-NH_(2))`.
The complete reaction is
`underset("Butanamide")(CH_(3)CH_(2)CH_(2)CONH_(2))+ Br_(2)+4KOH overset(Delta)to underset("Propan-1-amine")(CH_(3)CH_(2)CH_(2)-NH_(2))+ 2KB r+K_(2)CO_(3)+2H_(2)O`
(ii) Benzamide is an aromatic amide containing seven carbon atoms. therefore, the amine FORMED from benzamide is aromatic primary amine containing six carbon atom, i.e.,

The complete reaction is ltBrgt .
Discussion
11339.

Which of the following optically active

Answer»

ETHYLENE glycol
Oxalic acid
Glycerol
Tartaric acid

Solution :Tartaric acid have the chiral carbon (*) atom. So it is OPTICALLY ACTIVE.
.
Discussion
11340.

x = Number of compounds for which formaldehyde is necessary as reactant to obtained them by aldol reaction or condensation HO-CH_(2)-CH_(2)-CHO

Answer»


SOLUTION :`III, VI, VII and VIII`
Discussion
11341.

The sequence in which amino-acids are arranged in protein is called

Answer»

PRIMARY structure
Secondary structure
Tertiary structure
Quaternary structure

Answer :A
Discussion
11342.

The sodium hydroxide is used in the manufacture of

Answer»

Soaps
Dyes
Rayon
All of these

Answer :D
Discussion
11343.

Which of the following statements are correct for SO_(2) gas ?

Answer»

It acts as bleaching AGENT in moist conditions
It's molecule has linear geometry
It's dilute solution isused as disinfectant
It can be prepareed by the reaction of dilute `H_(2)SO_(4)` with metal SULPHIDE

Solution :`SO_(2)` has angular geomety. When dil. `H_(2)SO_(4)` reacts with metal sulphide, `H_(2)S` is PRODUCED and not `SO_(2)`. Thus, option (a) and (c) are correct.
Discussion
11344.

Which of the following has very high IP_2 value

Answer»

Zn
Mn
Cu
Ti

Answer :C
Discussion
11345.

What would you observe if excess of dilute NaOH solution is added and shaken with an aqueous solution of aluminium chloride?

Answer»

A PERMANENT white precipitate is formed immediately
No change at FIRST but a while precipitate is formed on standing
A white precipitate is formed which later dissolves
A green precipitate which TURNS RED on standing in air

Answer :C
Discussion
11346.

Total number of geometrical isomers in the given compound are

Answer»


ANSWER :4
Discussion
11347.

WhenC_6 H_5N_2Cl is reduced withNa _2 SnOO_2, the product is :

Answer»

` (##KSV_CHM_ORG_P2_C15_E01_128_O01.png" WIDTH="30%">


SOLUTION :DIAZO group can be replaced by (H) on reeduction with`Na_2 SnO_2` or `H_3 PO _2` warm with `C_2 H_5 OH`.
Discussion
11348.

What is a hypotonic solution ?

Answer»

Solution :Hypotonic solutions : When two solutions have DIFFERENT osmotic PRESSURES, then the solution having lower osmotic pressure is SAID to be a hypotonic solution with respect to the other solution.
EXPLANATION : Consider two solutions of the substances A and B having osmotic pressures `pi_(A) and pi_(B)`. If `pi_(B)` is less than `pi_(A),` then the solution B is a hypotonic solution with respect to the solution A.
Hence, if `C_(A) and C_(B)` are their concentrations, then, `C_(B)ltC_(A)`. Hence, for EQUAL volumes of the solutions, `n_(B) lt n_(A).`
Discussion
11349.

Which of the following contains largest number of carbon atoms ?

Answer»

15 gm ethane ,`C_(2)H_(6)`
40.2 gm sodium oxalate ,`Na_(2)C_(2)O_(4)`
72 gm glucose, `C_(6)H_(12)O_(6)`
35 gm PENTENE,`C_(5)H_(10)`

ANSWER :D
Discussion
11350.

Which reagent will you use for the following reaction? CH_(3)CH_(2)CH_(2)CH_(3)rarrCH_(3)CH_(2)CH_(2)CH_(2)Cl+CH_(3)CH_(2)CHClCH_(3)

Answer»

`Cl_(2)//UV` LIGHT
`NaCl+H_(2)SO_(4)`
`Cl_(2)` gas in DARK
`Cl_(2)` gas in the PRESENCE of iron in dark

Answer :A
Discussion