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7051.

Which of thefollowing is not an example of ionic

Answer»

LIH
`CaH_(2)`
`CSH`
`GeH_(2)`

ANSWER :D
Discussion
7052.

The turbidity of a polymer solution measures :

Answer»

a LIGHT ABSORBED by solution
light transmitted by the solution
light scattered by the solution
none of the above

Answer :C
Discussion
7053.

Which of the following pairs is an example of position isomerism

Answer»

`CH_(3)-CH_(2)-CH_(2)-CH_(3)` and `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(3)`
`CH_(3)-CH_(2)-CH = CH_(2)` and `CH_(3)-CH=CH-CH_(3)`
`CH_(3)-CH_(2)OH` and `CH_(3)-O-CH_(3)`
`{:(""CH_(3)),("|"),(CH_(3)-C-CH_(3)),("|"),(""CH_(3)):}` and `CH_(3)-CH_(2)-CH_(2)-CH_(2)-CH_(3)`

SOLUTION :`underset("1-butene")(CH_(3)-CH_(2)-CH)=CH_(2)` & `underset("2-butene")(CH_(3)-CH_(2)=CH-CH_(3))`
Discussion
7054.

Which of the following are addition homopolymers ?

Answer»

Teflon
SBR
PVC
Natural RUBBER

SOLUTION :SBR (styrene-butadiene rubber) is an ADDITION copolymer.
Discussion
7055.

What is the chemical composition of malachite?

Answer»

`CUO. CuCO_(3)`
`CU(OH)_(2).CuCO_(3)`
`CuO. Cu(OH)_(2)`
`Cu_(2)O.Cu(OH)_(2)`

Answer :B
Discussion
7056.

When the temperature is lowered and pressure is raised, the adsorption of a gas on a solid

Answer»

Decreases
Increased
Remains unaffected
Decreases FIRST then increases

Answer :B
Discussion
7057.

X(C_8H_14) by ozonolysis forms Y[C_8H_14O_2].Y on reaction with NaOI followed by acidification gives CHI_3 and compound Z on strong heating froms W. {:("Column-I","Column-II"),((A)"Compound X","(p)Bayer's Test"),((B)"Compound Y",(q)NaHCO_3),(( C)"Compound Z","(r)2, 4-DNP"),((D)"Compound W","(s)Iodoform Test"),(,"(t)Na Metal"):}

Answer»


Solution :`C_5H_14,DU=2`
OZONOLYSIS product `Y[C_8H_14O_2]` has 8 C ATOMS indicates (X) is cyclic compound with one double BOND. Thus Ais symmetrical CYCLOHEXENE.
Discussion
7058.

What is the co-ordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate ? Why is that no precipitate of copper sulphide is obtained when H_2 S(g) is passed through this solution ?

Answer»

Solution :`K_2 [Cu(CN)_4]` is formed when excess of aqueous KCN is added to an aqueous solution of `CuSO_4` .
`underset("SULPHATE soluble")underset("Copper")(CuSO_4(aq)) + underset("CYANIDE")underset("Potassium")(4KCN(aq)) to underset("tetracyanocuprate (II)")underset("Potassium")(K_2 [Cu(CN)_4]) + K_2 SO_4 (aq)`
As `CN^-` ions are strong ligands the complex is very stable. It is not replaced by `S^(2-)` ions when `H_2 S` gas is passed through the solution and thus no precipitate of CUS is obtained.
Discussion
7059.

Which of the following compounds does not react with NaOH ?

Answer»

`CH_(3)COOH`
`CH_(3)CONH_(2)`
`C_(6)H_(5)OH`
`CH_(3)CH_(2)OH`

Solution :`CH_3COOH underset(-H_2O)overset(NaOH)rarr CH_3COONa`
`CH_3CONH_2overset(NaOH)rarrCH_3COONa+NH_3`
`C_6H_5OH overset(NaOH)rarrC_6H_5ONa+H_2O`
But alcohos are weaker than water and ract with ALKALI METALS to form alkoxids and not with ALKALIES.
Discussion
7060.

Which one of the following is used in the extraction of alumininum by electronlytic process

Answer»

`Al_(2)O_(3)`
`Al(OH)_(3)`
`AlCl_(3)`
`Al_(2)(SO_(4))_(3)`

Answer :A
Discussion
7061.

Which of the following compounds has meso isomer?

Answer»

`CH_(3)CHNH_(2)CONH_(3)`
`HOCH_(2)CHOHCH_(2)CH_(3)`

ANSWER :C
Discussion
7062.

Write one reaction using alkaline KMnO_(4).

Answer»

Solution :`underset("Ethylene")(overset(CH_(2))overset(||)(CH_(2))) +H_(2)O+(O) underset("(BAEYER's REAGENT)")overset("Alkaline"KMnO_(4))(RARR) underset("Ethylene glycol")(overset(CH_(2)OH)overset(|)(CH_(2)OH))`
Discussion
7063.

Which of the following pair of compounds give same gaseous product on decomposition

Answer»

`KMnO_(4), K_(2)Cr_(2)O_(7)`
`KMnO_(4),(NH_(4))_(2)Cr_(2)O_(7)`
`K_(2)Cr_(2)O_(7), (NH_(4))_(2)Cr_(2)O_(7)`
`KMnO_(4), K_(2)CO_(3)`

Answer :A
Discussion
7064.

When chlorine gas is passed through and aqueous solution of potassium iodide containing strach, colour or the solution becomes............... .

Answer»

SOLUTION :The `I_(2)` liberated from `KI (2 KI + Cl_(2) rarr 2 KCL + I_(2))` TURNS starch solution BLUE.
Discussion
7065.

Which element has no neutron ?

Answer»

SOLUTION :HYDROGEN
Discussion
7066.

Why 3^@-butyl benzene does not give benzoic acid on oxidation with hot alkaline KMnO_4?

Answer»

Solution :Alkyl BENZENE is oxidised to BENZOIC acid with HOT alkaline `KMnO_4` when it has at least one BENZYLIC HYDROGEN. Since `3^0`-butyl benzene has no benzylic hydrogen atoms it is not oxidised by hot alkaline `KMnO_4`.
Discussion
7067.

Which of the following complex ion has tetrahedral arrangement ?

Answer»

`[AuCl_(4)]^(-)`
`[PbCl_(4)]^(2-)`
`[FeCl_(4)]^(-)`
All are having tetrahedral structure

Answer :C
Discussion
7068.

Which of the following is/are wrong?

Answer»

PhCO-`NH_(2)` gives BAD SMELLING substance with `CHCl_(3)`KOH
During pinacol-pinacolone rearrangement migratory aptitude is `H GT Ph gt 1^(@) gt 2^(@) gt 3^(@) gt Me`
3-chloro propanamide give 2-chloro ethanamine with KOBr
Tartaric acid gives POSITIVE FEHLING test

Answer :A::B::C::D
Discussion
7069.

The value of Henry's constant K_(H) is ……..

Answer»

Greater for gases with higher SOLUBILITY.
Greater for gases with lower solubility.
CONSTANT for all gases.
Not related to the solubility of gases.

Solution :Explanation : The value of Henry.s constant `K_(H)` is greater for gases with lower solubility because of the mathematical relation `- p=K_(H)X, K_(H)=p//X` where, `K_(H)` represents Henry.s constant, p is partial presure of the gas in vapour phase, and X denotes MOLE FRACTION of the gas in solution. Thus `K_(H)` is inversely PROPORTIONAL to mole fraction of gas in solution (representing its solubility).
Discussion
7070.

Total number of unpaired electrons present in Co^(3+) (Atomic number = 27) is

Answer»

2
7
3
5

Answer :D
Discussion
7071.

Which of the following metal(s) in liquid NH_(3) with low conc. Is not paramagnetic?

Answer»

`CS`
`Be`
`K`
`Mg`

SOLUTION :Due to high ionisation energy and metallic LATTICE energy Be and Mg do not dissolve into liquid `NH_(3)`: HENCE their solution in liquid `NH_(3)` is not paramagnetic.
Discussion
7072.

Which of the following forms is an ideal solution?

Answer»

ETHYL BROMIDE + ethyhl iondide
Ethyl ALCOHOL + water
Chloroform + benzene
Benzen + toluene

Solution :(a,d) are both CORRECT statemtnts.
Discussion
7073.

Which enzyme hydrolyses triglyceride to fatty acids and glycerol

Answer»

Amylase
Maltose
Lipase
Pepsin

Answer :C
Discussion
7074.

The specific rate constant of a first order reaction depends on the

Answer»

CONCENTRATION of the reactant
Concentration of the product
TIME
TEMPERATURE

Solution :It is a characteristics constant of a particular reaction at a given temperature . It does not DEPEND upon initial concentration of the reactants, time of reaction and extent of reaction .
Discussion
7075.

Which of the followingcompounds in NOT prepared by the action of alcoholic NH_(3) on alkyl halide ?

Answer»

`CH_( 3)NH_(2)`
`CH_(3)-CH_(2)-NH_(2)`
`CH_(3)-CH_(2)-CH_(2)-NH_(2)`
`(CH_(3))_(3)CNH_(2)`

Answer :B::C::D
Discussion
7076.

Two elements A and B form compounds having formula AB_(2) and AB_(4). When dissolved in 20 g of benzene (C_(6)H_(6)), 1 g of AB_(2) lowers the freezing point by 2.3 K whereas 1.0 g of AB_(4) lowers it by 1.3 K. The molar depression constant for benzene is 5.1 K kg mol^(-1). Calculate atomic masses of A and B.

Answer»

Solution :We know that,
`M_(2)=(1000xx w_(2)xx K_(f))/(Delta T_(f)xx w_(1))`
Then, `M_(AB_(2))=(1000xx1xx5.1)/(2.3xx20)=110.87g mol^(-1)`
`M_(AB_(4))=(1000xx1xx5.1)/(1.3xx20)=196.15 g mol^(-1)`
Now, we have molar masses of `AB_(2)` as `110.87 g mol^(-1)`and `196.15 g mol^(-1)` RESPECTIVELY.
Let the atomic masses of A and B x and y respectively. Now, we can write :
`x + 2y=110.87 ""`.....(i)
`x + 4y=196.15 ""`....(ii)
SUBTRACTING EQUATION (i) from (ii), we have
`2y=85.28`
`therefore y=42.64`
Putting the value of y in equation (1), we have `x + 2xx42.64 = 110.87`
`therefore x = 85.28`
Hence, the atomic masses of A and B are 25.59 u and 42.64 u respectively.
Discussion
7077.

Which of the following is an example of endothermic reaction

Answer»

`C_(2)H_(2)+2H_(2)rarrC_(2)H_(6),DeltaE=-314.0 kJ`
`C+O_(2)rarrCO_(2),DeltaE=-393.5 kJ`
`N_(2)+O_(2)rarr2NO,DeltaE-180.5 kJ`
`2H_(2)+O_(2)rarr2H_(2)O, DeltaE+571.8 kJ`

Solution :Heats of combustions are always exothermic except oxidation of N as.
`N_(2)+(1)/(2)O_(2)rarrN_(2)O DeltaH=+ve`
`N_(2)+O_(2)rarr2NO DeltaH=+ve`
Discussion
7078.

What is Browanian movement of colloidal solution? What is its cause ?

Answer»
Discussion
7079.

The Simplest formula of the compound containing 50% X (Atomic mass 10 amu) and 50% Y(Atomic mass 20amu) is:

Answer»

`XY_(2)`
`X_(2)Y`
`X_(2)Y_(3)`
`XY_(3)`

Solution :`{:("Element","%","ATOMIC RATIO","Simplest ratio"),(X,50,(50)/(10)=5,(5)/(1.5)=2),(Y,50,(50)/(20)=2.5,(2.5)/(2.5)=1):}`
Formula=`X_(2)Y`
Discussion
7080.

Which of the followingis basically responsiblefor acidicnatureof phenols ?

Answer»

Displacement of lone PAIR form oxygen atom.
RESONANCE between BONDS with only ONE pair of shared electrons.
Cleavage of the -O-H bond.
Resonance between bonds with two sharedpairs and the lone pair of the electrons.

ANSWER :C
Discussion
7081.

What IUPAC name would you give to the following compound? H_(3)C-overset(O)overset(||)C-CH_(2)-overset(Cl)overset(|)CH-CH_(3)

Answer»

SOLUTION :4 - Chloropental -2- ONE.
Discussion
7082.

Which one of the following is correctly matched ?

Answer»


SOLUTION :Gel-butter
Discussion
7083.

What IUPAC name would you give to the following compound ? H_(3)C-overset(O)overset(||)C-CH_(2)-overset(Cl)overset(|)CH-CH_(3)

Answer»

SOLUTION :4 - Chloropental -2- ONE.
Discussion
7084.

Which of the following comments are true for a dry cell -

Answer»

a ZN can (or CONTAINER) ACTS as the anode `MnO_(2)` and carbon black remain in contact with a Zn can
it can be recharged
a graphite ROD serves as the cathode

Answer :A::D
Discussion
7085.

Which of the following statement is correct regarding following species? (i) Cl overset(E.A.)to Cl^(-) (ii) Cl^(-) overset(I.E.)to Cl (iii) Cl overset (I.E.) to Cl^+ (iv) Cl^(+) overset(I.E.)to Cl^(2+)

Answer»

|I.E. of PROCESS (II)|=|E.A. of process (i)|
|I.E. of process (III)|=|I.E. of process (ii)|
|I.E. of process (IV)|=|E.A. of process (i)|
|I.E. of process (iv)|=|I.E. of process (iii)|

ANSWER :A
Discussion
7086.

Which of the following will exhibit cis-trans isomerism?

Answer»

`CH_(2)Br-CH_(2)Br`
`CBr_(3)-CH_(3)`
`CHBr=CHBr`
`CBr_(2)=CH_(2)`

Answer :C
Discussion
7087.

Which of the following is absent in RNA ?

Answer»

THYMINE
Adenine
Guanine
Cytosine

Solution :Thymine
Discussion
7088.

When SO_2 gas is passed through cupric chloride solution:

Answer»

The solution becomes colourless
A WHITE precipitate is formed
No CHANGE TAKES place
Solution becomes colourless and a white precipitate is formed

Answer :D
Discussion
7089.

Which of the following statement is correct about halobenzene?

Answer»

lt are more reactive than HALOALKANE
C-X bond has always single bond CHARACTER
C-X bond in haloarene is more polar than C-X bond in haloalkane
NEVER undergoes `SN^(1)` reaction

Answer :D
Discussion
7090.

Why all adsorptions are exothermic in nature ?

Answer»

SOLUTION :ADSORPTION results because of attraction between the constituents of adsorbate and ADSORBENT. Since energy is ALWAYS released during attraction, it is an EXOTHERMIC process.
Discussion
7091.

Which one of the following is not feasible?

Answer»

`ZN(s)+CU^(2+)(aq)toCu(s)+Zn^(2+)(aq)`
`Cu(S)+Zn^(2+)(aq)toZn(s)+Cu^(2+)(aq)`
`Cu(s)+2Ag^(+)(ag)TOAG(s)+Cu^(2+)(ag)`
`FE(S)+Cu^(2+)(aq)toCu(s)+fe^(2+)(aq)`

ANSWER :B
Discussion
7092.

which of the following option is correct?

Answer»

In living organisms, circulation of `^14C`from atmosphere is high so the carbon content is content in organism
Carbon dating can be used to FIND out the age of earth crust and rocks
Radioactive absorption due to cosmic radiation is EQUAL to the rate of radioactive decay, hence the CARBONS content remains CONSTANT in living organisms
Carbon dating cannot be used to determine concentration of `^14C` in dead beings

Answer :c
Discussion
7093.

What is freezing point of a liquid ?

Answer»

Solution :Freezing point is the tempreature at which the vapour pressure of the liquid and the solid state BECOME identical i.e both solid and liquid states COEXIST. The liquid and solid are in EQUILIBRIUM state . The freezing point of a solution is LESS than the freezing point of a pure solvent .
Discussion
7094.

Which of the following has greatest number of atoms?

Answer»

1g of butane `(C_(4)H_(10))`
1g of nitorgen `(N_(2))`
1 g of SILVER (Ag)
1g of water `(H_(2)O)`

Answer :A
Discussion
7095.

The type of colloidal dispresino obtained when egg protein is mixed with water is called …………(multimolecular or macromolecular or associated colloid).

Answer»

SOLUTION :MACROMOLECULAR
Discussion
7096.

Which gas is filled in electric bulbs/tubes:

Answer»

`O_2`
`N_2`
Ar
He

Answer :C
Discussion
7097.

What is smelting? Explain with an example.

Answer»

Solution :(1) Smelting : The PROCESS of extraction of a metal from itsore by heating and melting at high temperature is called smelting.
(2) The ores of less electropositive metals after concentration androasting are REDUCED by strongly heating with powerful reducing agents like Na, Mg, Al in the blast furnace .
`Cr_(2)O_(3) + overset(Delta)to2Cr + Al_(2)O_(3)`
(3) During smelting, flux is added to convert INFUSIBLE impurities (gangue) into a slag.
`FeO_((S)) underset(flux)(SinO_(2))overset(Delta)to underset("slag")(FeSiO_(3))`
(4)During smelting autoreduction also takes place giving molten metal,
`2Cu_(2)O +Cu_(2)S to 6Cu_((l)) +SO_(2)`
Discussion
7098.

Which among the followings is most basic in aqueous solution

Answer»

PRIMARY methylamine
aniline
Sec-methylamine
tert-methylamine

Answer :C
Discussion
7099.

What are the two types ofbuffer? Give an example for each.

Answer»

Solution :(i) ACIDIC buffer solution :a solution containing a weak ACID and its salt.
Example. Solution containing ACETIC acid and sodium acetate
(ii) BASIC buffer solution :a solution containing a weak base and its salt.
Example : Solution containing `NH_4OH and NH_4 CI`.
Discussion
7100.

The shape of IF_(6)^(-) is :

Answer»

Trigonally distorted octahedron
PYRAMIDAL
Octahedral
Square antiprism

Solution :The structure of `IF_(6)^(-)` is distorted octahedral This is due to presence of a "weak" lone PAIR.
Discussion