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12551.

What is the minimum pH required to prevent the precepitation of ZnS in a solution that is 0.01 M ZnCl_(2) and saturated with 0.10 M H_(2)S? [Given k_(sp) " of " ZnS = 10^(-21), "For " H_(2)S K_(a1) xx K_(a2) = 10^(-20)]

Answer»


Solution :`K_(SP) =[ZN^(2+)][S^(2-)]`
`[S^(2)] =10^(-21)/0.01 = 10^(-19)`
`THEREFORE` for `K_(a1).K_(a2) = ([H^(+)]^(2)[S^(2-)])/([H_(2)S])`
`10^(-20) = ([H^(-)]^(2) xx 10^(-19))/(0.1) rArr [H^(+)] = 0.1` or pH =1
Discussion
12552.

What is (are) number (s) of unpaired electron(s) in the square planar [Pt(CN)_4]^(2-) ion ?

Answer»

Zero
1
4
6

Solution :Outer electronic configuration of PT is `5d^(9) 6s^(1)`. Outer electronic configuration of `Pt^(2+)" is "5d^(8)`
As `CN^(-)` is strong FIELD ligand, so paring will take place.
`Pt^(2+)`
Discussion
12553.

The time for half life change in a first order decomposition of a substance A is 60 seconds. Calculate the rate constant. How much of A will be left after 180 seconds ?

Answer»

Solution :`t^((1)/(2))= 60` min
Order of reaction = first order, So, for first order reaction,
We have
`t^((1)/(2))=(0.693)/(K)`
`K=(0.693)/(t_((1)/(2)))=(0.693)/(60)=0.0115 S^(-1)`
`K=0.0115 S^(-1)`.
For TIME 3 mins (180 Sec)
`K=(2.303)/(t)"log"([a_(0)])/([a])`
`therefore 0.0115 = (2.303)/(t)"log"([a_(0)])/([a])`
`log = ([a_(0)])/([a])0.014`
`([a_(0)])/([a])` = ANTILOG (0.014)
`([a_(0)])/([a])=1.0327`
% of the reactant left after 3 min
`([a])/([a_(0)])xx100=(1)/(4)=25%`.
Discussion
12554.

Which one of the following is fat soluble vitamin?

Answer»

VitaminB1
Vitamin B6
Vitamin C
Vitamin A

Answer :D
Discussion
12555.

Vapours of an alcohol 'C' on passing over heated copper produce compound 'D'. 'D' on reaction with CH_(3)MgCl followed by hydrolysis produces 2-methylbutan-2-ol. Write the names and structures of compound 'C' and 'D'.

Answer»

SOLUTION :(i) Since 2-methylbutan-2-ol is PRODUCED when compound (D) reacts with `CH_(3)MgBr` followed by hydrolysis. Therefore, compound (D) MUST be butanone.

(ii) Since butanone (D) is produced when vapours of ALCOHOL (C) are passed over heated copper, therefore, alcohol (C) must be butan-2-ol.
.
Discussion
12556.

Which initiator is used for free radical addition polymerization reaction ?

Answer»

Base
ACETYL peroxide
Acid
Sulphate SALT

SOLUTION :Acetyl peroxide
Discussion
12557.

Which of the following is least basic

Answer»




ANSWER :D
Discussion
12558.

What is DeltaE when 2.0 mole of liquid water vaporises at 100^(@) ? The heat of vaporisation, DeltaH vap. Of water at 100^(@)C" is "40.66KJmol^(-1).

Answer»

SOLUTION :`DeltaE=75.11kJ`
Discussion
12559.

Which of the following complexes are capable of showing geometrical isomerism ?

Answer»

`Pt(NH_(3))_(2)Cl_(2)`
`[CO(NH_(3))_(4)Cl_(2)]^(+)`
`CoCl_(2)(en)_(2)`
`Pt(NH_(3))_(4)^(2+)`

Answer :A::B::D
Discussion
12560.

The strongest base among the following agent.

Answer»

2, 4, 6-Trinitro-N, N-dimethylaniline
ANILINE
2, 4, 6-Trinitroaniline
N, N-Dimethylaniline.

Solution :
Presence of TWO bulky `NO_(2)` GROUPS at `o-`positions to N-atom does not allow the lone pair on N to take part in resonance. This INCREASES the availability of lone pair on nitrogen. Further, the presence of two methyl groups increase, the basic character due to `+I` effect of `CH_(3)`. This makes 2, 4, 6-Trinitro`-N`, N-dimethyl aniline most basic, out of the given four CHOICES
Discussion
12561.

Valence forces cause

Answer»

chemisorption
Tonic bond
sorption
adsorption INVOLVING MULTI LAYERS 

ANSWER :A
Discussion
12562.

Which of the following compound ist not used as fertilizer

Answer»

Ammonium SULPHATE
Urea
Calcium super phosphate
`Ca_(3)(PO_4)_2`

ANSWER :D
Discussion
12563.

Which property of the transition elements makes them good catalysts?

Answer»

Solution :They exhibit MULTIPLE OXIDATION states and have vacant d-orbitals which can be used to MAKE bonds with REACTANT molecules.
Discussion
12564.

The silver salt of a fatty acid on refluxing with an alkyl halide gives :

Answer»

acid
ester
ether
amine

Solution :On heating with silver sults of fatty acids in alcoholic solution, alkyl halides yield ESTERS.
`R.COOAg + XRto R.COOR + AG X`
`CH_(3)COOAg+BrC_(2)H_(5)toCH_(3)COOC_(2)H_(5)+AgBr`
Discussion
12565.

The solubility product constant K_(sp) of Mg(OH)_(2) is 9.0 xx 10^(-12). If a solution is 0.010 M with respect to Mg^(2+) ion, what is the maximum hydroxide ion concentration which could be present without causing the precipitation of Mg(OH)_(2)

Answer»

`1.5 xx 10^(-7) M`
`3.0 xx 10^(-7) M`
`1.5 xx 10^(-5) M`
`3.0 xx 10^(-5) M`

Solution :`{:("MG"(OH)_(2),hArr,Mg^(++)+,2OH^(-)),(K_(sp),=,S,(2S)^(2)):}`
`K_(sp) = S xx 4S^(2)`
`(K_(sp))/(S xx 4) = S^(2) = (9 xx 10^(-12))/(0.010 xx 4) = 2.25 xx 10^(-10)`
`S = sqrt(2.25 xx 10^(-10)) = 1.5 xx 10^(-5) m/l`
`= 1.5 xx 2 xx 10^(-5) m//l = 3 xx 10^(-5)m//l`.
Discussion
12566.

Which one of the following carbon alotrope is very hard?

Answer»

GRAPHITE
Diamond
Fullerene
Graphene

Answer :A::D
Discussion
12567.

Which of the following cannot be obtained by electrolytic reduction of their compounds in aqueoussolution?

Answer»

BARIUM
CADMIUM
POTASSIUM
nickel

Answer :A::C
Discussion
12568.

Which of the following configurations is associated with biggest jump between second and third I.E.?

Answer»

`1S^(2)2s^(2)2P^(2)`
`1s^(2)2s^(2)2p^(6)3s^(1)`
`1s^(2)2s^(2)2p^(6)3s^(2)`
`1s^(2)2s^(2)2p^(1)`

SOLUTION :After the loss of TWOELECTRONS, the ION acquires the stable electronic configuration of noble gas `[2s^(2)2p^(6)]`
Discussion
12569.

We have three aqueous solutions of NaCl labelled 'A', 'B' and 'C' with concentrations 0.1 M, 0.01 M and 0.01 M respectively. The value or Van't Hoff factor for these solutions will be in the order ………….. .

Answer»

`i_(C)=i_(B)=i_(A)`
`i_(C) GT i_(B) gt i_(A)`
`i_(A) gt i_(C) gt i_(B)`
`i_(B) gt i_(A) gt i_(C)`

ANSWER :B
Discussion
12570.

Two isomeric compounds Cl-CH_2-CH_2-CH_2Cl and CH_3-CH_2-CHCl_2 can be distinguished by the use of

Answer»

`HOH//OH^-`
Tollens REAGENT
Both `HOH//OH^(-) ` and Tollens reagent
`HOH//OH^-` , Tollens reagent and ceric ammonium NITRATE

ANSWER :D
Discussion
12571.

When sodium formate is heated it gives:

Answer»

Hydrogen
Water
SODIUM hydroxide
Carbon dioxide

Answer :A
Discussion
12572.

Which of the following halogen turn(s) starch Iodide paper blue

Answer»

`Cl_(2)`
`Br_(2)`
`I_(2)`
`F_(2)`

SOLUTION :`I_(2)` released by `Cl_(2), Br_(2)` gives blue colour to starch.
Discussion
12573.

Which analgesic drug is more useful for patients of heart disease ?

Answer»

Ranitidine
Asprin
Seconal
Paracetamol 

ANSWER :B
Discussion
12574.

Which type of isomerism is shown by pentanone ?

Answer»

CHAIN ISOMERISM
positionisomerism
FUNCTIONALISOMERISM
All of these

Answer :D
Discussion
12575.

Which one is most reactive towards Nucleophilic addition reaction

Answer»




Solution :Electron WITHDRAWING GROUP i.e., `-NO_(2)` FAVOURS NUCLEOPHILIC ATTACK.
Discussion
12576.

Which elements are generally used in the formation of compounds of xenon ?

Answer»

SOLUTION :OXYGEN and FLUORINE
Discussion
12577.

What are narcotic analgesics? Give examples.

Answer»

Solution :(i) NARCOTIC analgesics are OPIOIDS that relieve pain and produce sleep. These drugs are addictive. In poisonous dose, these produces COMA and ULTIMATELY death. EG., morphine, codeine.
(ii) These drugs are used for short term or long term relief of severe pain. Mainly used for post operative pain. Pain of terminal cancer.
Discussion
12578.

Whichof the following on hydrolysis will give dibasic acid ?

Answer»

`PCl_(5)`
`PCl_(3)`
`BCl_(3)`
`SiCl_(4)`

Answer :B
Discussion
12579.

Which of the following pairs of gases will have identical rate of effusion under similar conditions?

Answer»

Dideuterium and Helium
Diprotium and Dideuterium
Propene and Propane
Nitrogen DIOXIDE and CARBON dioxide

Answer :A
Discussion
12580.

Which of the following is an electron deficient compound ?

Answer»

`B_(2)H_(6)`
`Al_(2)Cl_(6)`
`NaBH_(4)`
`H_(3)BO_(3)`

ANSWER :A
Discussion
12581.

Which of the following statement is correct for the compound (Y)?

Answer»

It exists as POLYMER and the coordination NUMBER of AL is 6
It exists as dimer and the coordination number of Al is 4
It exists as monomer
None of the above

Answer :B
Discussion
12582.

Write the structural formula of (i) p - methyl benzaldehyde (ii) 2 - methyl cyclohexanone

Answer»

SOLUTION :
Discussion
12583.

Which of the following does not show any reducing test of aldehyde

Answer»

Sucrose
Fructose
MALTOSE
Lactose

SOLUTION :In sucrose the two monosaccharide units joined by `alpha-1,2` GLYCOSIDE bond. Since sucrose does not have hemiacetal CARBON. Therefore it is non-reducing sugar.
Discussion
12584.

What happens when white phosphorus is heated with concentrated NaOH solution in an inert atomosphere of CO_(2) ?

Answer»

<P>

Solution :White PHOSPHORUS when heated with concentrated `NAOH` forms phosphine, `PH_(3)` and sodium hypophosphite, `NaH_(2)PI_(2)`.
`P_(4)+underset("conc.")(3NaOH)+3H_(2)Ooverset("hot")rarr PH_(3)+3NaH_(2)PO_(2)`
Discussion
12585.

Which compounds on Clemmenson reduction give ethyl benzene

Answer»

Solution :`UNDERSET("Acetophenone")(C_(6)H_(5)-underset(O)underset(||)(C)-CH_(3))underset(HCL[H])overset(Zn//Hg)tounderset("Ethyl benzene")(C_(6)H_(5)CH_(2)CH_(3))`
Discussion
12586.

What is Zwitterion?

Answer»


ANSWER :ZWITTERION is the dipolar ion of AMINO acid
Discussion
12587.

Which of the following are correct statements?

Answer»

When mixture is more volatile, there is positive deviation from Raoult's law.
When mixture is LESS volatile, there is negative deviation froin Raoult's law
Ethanol and WATER form IDEAL SOLUTION.
`CHCl_3` and water form ideal solution

Solution :`(a,b)`
Discussion
12588.

Write IUPAC name of the following. H_2N - CH_2-CH_2-CH_2-CH_2 - CHO

Answer»

SOLUTION :5-Aminopent-2en-1-al
Discussion
12589.

Which of the following solutions has higher freezing point ?0.05 M Al_2(SO_4)_3, 0.1 M K_3[Fe(CN)_6] . Justify.

Answer»

Solution : Depression in freezing POINT depends upon the concentration of the solution.` 0.05 M Al_2(SO_4)_3 `has a lower concentration than `0.1 M K_3 [Fe(CN)_6]`solution.
Thus, `0.05 M Al_2(SO_4)_3`gives a lower depression in freezing point. In other words, it will freezeat HIGHER temperature.
Discussion
12590.

Which of the followingaresoluble in excess of NaOH(X) :As_(2)S_(3) ,(Y) : CuS ,(Z) : AICI_(3)

Answer»

X,Y,Z
Y,Z
X,Z
X,Y

Answer :C
Discussion
12591.

Which one combination is correct?

Answer»

`(II),(i),(S)`
`(II),(ii),( R)`
`(II),(ii),(Q)`
`(IV),(i),(Q)`

Answer :C
Discussion
12592.

Write the products obtained after hydrolysis of lactose.

Answer»

SOLUTION :GLUCOSE and GALACTOSE.
Discussion
12593.

Which of the following is not an endothermic reaction?

Answer»

Dehydrogenation
Ethane to ethene
COMBUSTION of propane
Change of chlorine MOLECULE into chlorine atoms

Solution :Combustion of propane is an exothermic REACTION because the ENTHALPY of combustion (i.e., `DeltaH`) is ALWAYS negative.
Discussion
12594.

Which of the following can show geometrical isomerism?

Answer»

`[Pt(NH_(2)-UNDERSET(CH_(3))underset(|)(C)H-underset(CH_(3))underset(|)(C)H-NH_(2))_(2)]^(2+)`
`[Co(en)_(2)NH_(3)CL]^(2+)`
Both (a) and (b)
NONE of these

Solution :
Discussion
12595.

What is the coordination number of metal ion in the red complex ion formed in a qualitative analysis test of iron (III)

Answer»


SOLUTION :Complex ion is `[Fe(H_(2)O)_(5)SCN]^(2+)`, it has coordination number six.
Discussion
12596.

Which of the following order is correct among the following ? C-XBond length order is H_3C -F lt CH_3 C-Cllt H_3 C- Br lt H_3 C-l ( ii)C- X Bond enthalapies order is H_3C -Clgt H_3C -F gt CH_3 -Br gt CH_3-I (III) C-X Bond dipole moment order is H_3C-Cl gt H_3 C-F gt CH_3 -Br gt CH_3 -I

Answer»

Only I & II 
Only II & III
Only I & III 
All are CORRECT 

ANSWER :D
Discussion
12597.

Total order of reaction X+YtoXY is 3 .The order of reaction with respect to X is 2.State the differential rate equation for the reaction

Answer»

`(-d[X])/(DT)=K[x]^(3)[Y]^(0)`
`-(d[X])/(dt)=K[X]^(0)[Y]^(3)`
`-(d[X])/(dt)=K[X]^(2)[Y]`
`-(d[X])/(dt)=K[X][Y]^(2)`

Answer :C
Discussion
12598.

What is the mass of a water molecule in gram ? How many molecules are present in one drop of pure water which weight 0.05 g ? If the same drop of water evaporates in one hour, calculate the number of molecules leaving the liquid surface per second.

Answer»


Solution :`"1 mol of "H_(2)O=18g=6.022xx10^(23)" molecules"`
`therefore"MASS of one molecule of "H_(2)O=(18)/(6.022xx10^(23))G=2.989xx10^(-23)g`
`0.05g" og "H_(2)O=(0.05)/(18) mol=(0.05)/(18)xx6.022xx10^(23)" molecules"=1.673xx10^(21)" molecules"`
`"No. of molecules leaving PER SEC"=(1.673xx10^(21))/(60xx60)=4.647xx10^(17)`
Discussion
12599.

Name the reagent usedin the dehydrohalogenation of haloalkanes .

Answer»

alc. KOH
AQ. KOH
SODAMIDE
NAOH + CaO

Answer :A
Discussion
12600.

The reduction can be best carried out by

Answer»

CLEMMENSEN's REDUCTION
Woff-Kishner reduction
`NaBH_(4)`
`LiAlH_(4)`

ANSWER :B
Discussion