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16951.

Which pair shows a contraction in volume on mixing along with evolution of heat-

Answer»

`CHCl_3 + C_6H_6`
`H_2O + HCL`
`H_2O + HNO_3`
All

Answer :D
Discussion
16952.

Which salt forms plaster of paris on being appropriately hydrated ?

Answer»

`CaCO_3`
`MgSO_4`
`CaSO_4`
`ZnCO_3`

ANSWER :C
Discussion
16953.

Which of the following has maximum sweetness?

Answer»

GLUCOSE
Fructose
MALTOSE
SUCROSE.

Answer :B
Discussion
16954.

Which of the following is picramide ?

Answer»




SOLUTION :
Discussion
16955.

Which is used in the manufacture of plastic

Answer»

`CH_(2)=CHCl`
`CH-=CH`
`CH_(2)=CH-CH_(2)I`
`C Cl_(4)`

Solution :`nunderset("Vinyl CHLORIDE")(C(CH_(2)=CH-Cl))overset("Polymerization")to-underset("Polyvinyl chloride (PVC)")((-CH_(2)-underset(Cl)underset(|)(CH)-)_(n))`
Discussion
16956.

The specific conductance (k)of a 0.1M NaOH solution is 0.0221 S cm^(-1). On addition of an equal volume (V) of0.10 M HCI solution, the value of specific conductance (k) falls to 0.0056 S cm^(-1). On further addition of same volume (V) of 0.10 M HCI, the value of k rises to 0.017 S cm^(-1). calculate equivalent conductivity (^^) for HCI in S cm^(2) mol^(-1).

Answer»


Solution :On further ADDING `V` VOLUME `0.10 M HCI`, concentration of `NaCI` and `HCI` in the final solution are:
`[NaCI] = (0.05 xx2)/(3) = (1)/(30)M`
`[HCI] = (0.1xx1)/(3) = (1)/(30)M`
Also, since specific conductivity is ADDITIVE:
`k = K_(NaCI) +K_(HCI)`
`rArr K_(HCI) = 0.017 - 0.0056`
`= 0.0114 S cm^(-1)`
`rArr ^^_(HCI) = (0.0114 xx 1000)/((1)/(30)) = 342 S cm^(2) MOL^(-1)`
Soans is `3 +4 +2 = 9`
Discussion
16957.

To get phenylethanal , which compounds should be treated with chromyl chloride ? Give equation.

Answer»

SOLUTION :ETHYL BENZENE on treatment with CHROMYL chloride. Phenylethanal is obtained.
Discussion
16958.

Bromobenzene to 1-phenylethanol

Answer»

SOLUTION :
Discussion
16959.

What is the melting point of ice at one atmospheric pressure in Kelvin scale ?

Answer»

SOLUTION :The melting POINT of ICE in KELVIN SCALE is 273 K .
Discussion
16960.

Which of the following molecules in pure from is (are) unstable at room temperature

Answer»




SOLUTION :N/A
Discussion
16961.

Which of the following is a fibre?

Answer»

NYLON
neoprene
PVC
bakelite

SOLUTION : nylon
Discussion
16962.

Write equation for: i) The reaction between Carboxylic acid and PCl_(5) ii) The reaction between formaldehyde and conc KOH. iii) The formation of oxime from carbonyl compound.

Answer»

Solution :i) `UNDERSET("Carboxylic acid")(R-COOH)+PCl_(5)rarr underset("Acid chloride")(R-COCl)+underset("Phosphorous")(POCl_(3))+underset("oxy chloride")(HCl)`
ii) `underset("Aldehyde")(2H-overset(H)overset(|)C=O)+KOH rarr underset("POTASSIUM formate")(H-COONa)+underset("Methanol")(CH_(3)-OH)`
III) `-overset(|)C=O+underset("Hydroxyl amine")(H_(2)N-OH) overset(H^(+))rarr underset("oxime")(-overset(|)C=N-OH)+H_(2)O`
Discussion
16963.

Which restores the colour of the lead paintings ?

Answer»

Hydrogen
Oxygen
Ozone
Hydrogen peroxide

Answer :D
Discussion
16964.

When10of anon-volatilesoluteisdissolvedin 100g ofbenzene. Itraisesboilingpointby 1^(@)Cthen moles massof thesoluteis ______.

Answer»

223 G
233 g
243 g
253 g

Solution :`DELTA T_(B)=(K_(b)xx W xx1000)/(m xx W)`
`m=(K_(b)xx wxx 1000)/(Delta T_(b)xx W)=(2.53xx10xx1000)/(1xx100)=253 g`
Discussion
16965.

What is the lowest value of n that allows the g-subshell to exists?

Answer»

n=1
n=4
n=3
n=5

Answer :D
Discussion
16966.

Which pair is correctly matched ?

Answer»

`[Fe(OH)_(3)] : Fe^(3+)`
`[As_(2)S_(3)] : As^(3+)`
`[SnO_(2)] : SnO_(3)^(2-)` in acidic MEDIUM
`[Agl] : I^(-)` in excess of `AgNO_(3)`

ANSWER :A
Discussion
16967.

Which one of the following reagents is used for detection of unsaturation in alkenes

Answer»

`NaOH + CaO`
Cold DILUTE alkaline `KMnO_(4)`
`Cl_(2)//HV`
`KOH//C_(2)H_(5)OH`

Solution :N//A
Discussion
16968.

Which of the following is false statement?

Answer»

`(dE // dT) = 0` for ideal gas
`K = e^(-DELTA G^@//RT)`
`Delta G = -nFE_(CELL)^@`
For an isothermal CHANGE `Delta E = 0`

SOLUTION : For an ideal gas, at constant VOLUME,
Discussion
16969.

The solubility product of Ag_(2)CrO_(4) is 32 xx 10^(-12). What is the concentration of CrO_(4)^(-) ions in that solution

Answer»

`2 xx 10^(-4) M`
`16 xx 10^(-4) M`
`8 xx 10^(-4) M`
`8 xx 10^(-8) M`

Solution :`UNDERSET(S)(Ag_(2)CrO_(4)) rarr underset(2S)(2Ag^(+)) + underset(S)(CrO_(4)^(--))`
`K_(sp) = (2S)^(2)S = 4S^(3)`
`S = ((K_(sp))/(4))^((1)/(3)) = ((32 xx 10^(-12))/(4))^((1)/(3)) = 2 xx 10^(-4) M`.
Discussion
16970.

Which gas is used to improve the atmosphere of crowded places:

Answer»

`H_2`
`O_2`
`O_3`
`N_2O`

ANSWER :C
Discussion
16971.

A cell is set up between ‘Zn’ and ‘Cu’ electrode. If the two half cells work under standard condition, calculate the cell potential. Given E^@(Zn^(2+)//Zn)=-0.76V and E^@(Cu^(2+)//Cu)=+0.34V.

Answer»

Copper
Zinc
Hydrogen
`CU^(2+)`

ANSWER :D
Discussion
16972.

When t-butanol and n-butanol are separately treated with a few drops of dilute KMnO_(4) in one case only, the purple colour disappears and brown precipitate is formed. Which of the two alcohols gives the above reaction and which is the brown precipitate?

Answer»

SOLUTION :`t`-Butanol is not oxidised by dilute `KMnO_(4)`, so it does not GIVE brown-black precipitate of `MnO_(2)`. `n`-Butanol is oxidised with dil `KMnO_(4)`, so the purple colour of `KMnO_(4)` is DISCHARGED and `MnO_(4)^(ɵ)` is converted to brown-black precipitate of `MnO_(2)`.
Discussion
16973.

The two enantiomers of a compound have :

Answer»

DIFFERENT DIREACTION of rotationbut the same AMOUNT of ROTATION
same direaction of rotation but different amount of rotation
same direaction of rotation as WELL same amount of rotation
different direaction of rotation as well as different amount of rotation.

Answer :A
Discussion
16974.

Whichof the followingis morebasic ?

Answer»

Methenamine
Ethanamine
PROPAN - 2 AMINE
Phely METHANAMINE

Answer :B
Discussion
16975.

Which of the following is not known

Answer»

`NCl_(5)`
`NI_(3)`
`SbCl_(3)`
`NCl_3`

SOLUTION :`NCI_5` is not known because of ABSENCE of d-
Discussion
16976.

Which one of the following metals has no action with dil.H_(2)SO_(4)?

Answer»

Mg
Fe
Zn
Cu

Answer :4
Discussion
16977.

Which reactions are most common in alkenes

Answer»

Electrophilic SUBSTITUTION reactions
Nucleophilic substitution reactions
Electrophilic addition reactions
Nucleophilic addition reactions

Solution :Electrophilic addition reactions are shown by alkenes or ALKYNES, in these reactions attacking SPECIES is electrophiles
`CH_3-CH=CH_2+H^(+)overset"Slow"to underset(2^@"carbonium ion")(CH_3-overset+CH-CH_3)`
`CH_3-overset+CH-CH_3+Br^(-)overset"Fast"to underset"2-Bromopropane"(CH_3-undersetunderset(Br)(|)CH-CH_3)`
Discussion
16978.

When excess of silver nitrate solution is added to the aqueous solution containing 0.1 mole of CoCl_3 . xNH_3, if 28.7g of silver chloride precipitated, what is the value of x ?

Answer»

Solution :Number of MOLES of AgCl precipitated `=(28.7)/(143.5)=0.2` mole.
0.1 mole of `CoCl_(3).xNH_(3)` gives 0.2 mole `AgCl`. One mole of `CoCl_(3).xNH_(3)` gives 2 moles of AgCI.
Thus in the complex `CoCl_(3).xNH_(3)` two CHLORIDE ions SATISFY only primary valence. One chloride ion SATISFIES both secondary valence and primary valence.
Since the secondary valence of `Co^(3+)` is six and one `Cl^(-)` is in coordination SPHERE, complex possesses five `NH_(3)` . Thus .x. value is five.
Discussion
16979.

What is the geometty of water molecule?

Answer»

distored, tetrahedral
tetrahedral
trigonal planer
diagonal

SOLUTION :
`sp^(3)` -Distorted tetrahedral due to two lone pair of ELECTRONS.
Discussion
16980.

Zinc blende is ore of :

Answer»

Aluminium
Calcium
Copper
ZINC

ANSWER :D
Discussion
16981.

Which one of the following electrolytes has the same value of van't Hoff factor (i) as that of Al_(2)(SO_(4))_(3) (if all are 100% ionized) ?

Answer»

`K_(2)SO_(4)`
`K_(3)[Fe(CN)_(6)]`
`Al(NO_(3))_(3)`
`K_(4)[Fe(CN)_(6)]`

SOLUTION :`Al_(2)(SO_(4))_(3)` and `K_(4)[Fe(CN)_(6)]` produce the same number of ions in the solution (VIZ. 5). HENCE, they have the same value of van't Hoff factor.
Discussion
16982.

Which of the following polymer is condensation as well as cross-linked polymer ?

Answer»

NYLON 6,6
Dacron
Nylon-2, Nylon-6
BAKELITE

SOLUTION :Bakelite
Discussion
16983.

Which of the following statemets is correct for the spontaneous adsorption of a gas ?

Answer»

`DeltaS` is negative and, therefore, `DELTAH` should be highly POSITIVE
`DeltaS` is negative and, therefore, `DeltaH` should be highlt negative
`DeltaS` is positive and, therefore, `DeltaH` should be negative
`DeltaS` is positive and, therefore, `DeltaH` should also be highly positive

Solution :From Gibbs-Helmholtz equation, `DELTAG=DeltaH-T DeltaS` During ADSORPTION of a gas, entorpy DECREASES, i.e., `DeltaS` is -ve.
For spontaneous adsorption, `DeltaG` should be -ve. This is possible only if `DeltaH` is highly negative.
Discussion
16984.

Which allotropic form of phosphorus is used in the preparation of phosphine ?

Answer»

RED PHOSPHORUS
Black phosphorus
WHITE phosphorus
YELLOW phosphorus

Solution :White phosphorus
Discussion
16985.

Which contains two banana bonds ?

Answer»

`B_2H_6`
`B(OH)_3`
`BCl_3`
All of these

Answer :A
Discussion
16986.

Which of the following does not exhibit resonance

Answer»




ANSWER :A
Discussion
16987.

Vitamin which play role in coagulation property of blood is

Answer»

vit-A
vit-K
vit-E
vit-D

Answer :B
Discussion
16988.

Which of the carbon atoms present in the molecule given below are asymmetric ?

Answer»

1,2,3,4
2,3
1,4
1,2,3

Solution :The CARBON (2) and (3) are `p^(3)` with FOUR DIFFERENT valancies. Thus these are chiral (ASYMMETRIC) carbons.
Discussion
16989.

Zero group elements are monoatomic due to_______.

Answer»

SOLUTION :STABLE full-filled or CLOSED SHELL electronic-configuration
Discussion
16990.

What is the lowest molecular mass alkane that is chiral? Is there another alkane of the same molecular formula which is also chiral? If so, then give its structure also.

Answer»

Solution :The lowest molecular mass alkane which is chiral must have a chiral CARBON which is attached to four DIFFERENT atoms/groups of lowest molecular mass, i.e., H, `CH_(3),CH_(3)CH_(2) and CH_(3)CH_(2)CH_(2)`. THEREFORE, the alkane is 3-methylhexane.
Since the isomeric form of n-propyl group is isopropyl group, therefore, another alkane which is chiral is 2,3-dimethylpentane.
`UNDERSET("3-Methylhexane")(CH_(3)CH_(2)-overset(CH_(3))overset(|)(.^(**)C)H-CH_(2)CH_(2)CH_(3))""underset("2,3-Dimethylpentane")(CH_(3)CH_(2)-overset(CH_(3))overset(|)(.^(**)C)H-overset(CH_(3))overset(|)(C)H-CH_(3))`
Discussion
16991.

What is the action of dil NaOH on ethanal (acetaldehyde) ? Name the reaction

Answer»

Solution :When ethanal is treated with dil `NaOH` CONDENSATION TAKES PLACE to give `beta-` HYDROXY butanal. (3 - hydroxy butan -1- al)
This reaction is CALLED aldol condensation.
Discussion
16992.

Zero order reaction means……

Answer»

Reaction occuring at zero Kelvin temperature
The value of REACTIO rate is zero
The reaction in which the REACTANTS do not TAKE part in chemical reaction
Reaction rate and rate CONSTANT are equal

Answer :D
Discussion
16993.

Which of them liberate a gas which turns lime water milky .

Answer»


`{:(CH_(3)-CH-COOH),("|"),(""COOH):} OVERSET(DELTA)to`
`HOOC -(CH_(2))_(5)-COOH overset(Ca(OH)_(2)//Delta)to`

Answer :A::B::C
Discussion
16994.

This 'X' is …………………. .

Answer»




NONE of these

Solution :HYDRO boration - Anti MARKOWNIKOFF product i.e., `CH_3-CH_2-CH - CH_2 - CH_2-OH`
Discussion
16995.

Which of the following base is weakest

Answer»

`NH_(4)OH : K_(b) = 1.6 xx 10^(-6)`
`C_(6)H_(5)NH_(2) : K_(b) = 3.8 xx 10^(-10)`
`C_(2)H_(5)NH_(2) : K_(b) = 5.6 xx 10^(-4)`
`C_(6)H_(7)N : K_(b) = 6.3 xx 10^(-10)`

Solution :Smallest value of `K_(b)` indicates that aniline `(C_(2)H_(5)NH_(2))` is the WEAKEST BASE.
Discussion
16996.

VA group hydrides are Lewis bases due to the presence of

Answer»

unpaired electrons
high electron AFFINITY VALUES
low electronegativity
lone PAIR of electrons

Answer :4
Discussion
16997.

Which of the following is diamagnetic

Answer»

`[Fe(CO)_5]`
`[Fe(CN)_6]^(3-)`
`[CR(NH_3)_6]^(3+)`
`[Cr(H_2O)_6]^(3+)`

Answer :A
Discussion
16998.

Which of he following hydrogens will be most acidic?

Answer»

a
B
C
d

Answer :C
Discussion
16999.

Which of the following is a cyclic ether-

Answer»

ETHYL ETHER
PHENYL ether
Tetrahydrofurane
Vinyl ether

Solution :
Discussion
17000.

What is the wave length of electron wave in the first orbit of hydrogen atom?

Answer»

SOLUTION :`3.33xx10^(-8)CM`
Discussion