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11151.

What is the molality of ethyl alcohol (molar mass = 46) in aqueous solution which freezes at -10^(@)C: K_(f)for water = 1.86 K "molality"^(-1)

Answer»

`3.540`
4.567
5.376
6.315

Solution :`DELTA T_(F) = K_(f) XX m,`
`:.10 = 1.86 xx m ` or ` m=5.376`
Discussion
11152.

What is shape of O_3 molecule ?

Answer»

SOLUTION :ANGULAR SHAPE or V-shape.
Discussion
11153.

Which of the following statements for the order of a reaction is incorrect?

Answer»

ORDER can be determined only experimentally.
Order is not influenced by STOICHIOMETRIC coefficient of the reactants.
Order of the reaction is the sum of powers to the CONCENTRATION terms of reactants to express the RATE of reaction.
Order of the reaction is always a whole number.

Answer :D
Discussion
11154.

Which molecule is planar ?

Answer»

`NH_3`
`CH_4`
`C_2H_4`
`SiCl_4`

ANSWER :C
Discussion
11155.

Which of the following compounds will give red precipitate when heated with Fehling's solution?

Answer»

`R-OVERSET(OH)overset(|)CH-overset(O)overset(||)C-CH_(2)-R`
`C_(6)H_(5)CHO`
HCOOH
`CH_(3)COCH_(2)COCH_(3)`

Solution :Aldehydes (EXCEPT benzaldehyde), `alpha`-HYDROXY ketones, formic acid give positive Fehling.s test.
Discussion
11156.

There are some species given below. (i)O_(2)^(+)(ii)CO(iii)B_(2)(iv)O_(2)^(-)(v)NO^(+)(vi)He_(2)^(+)(vii)C_(2)^(2+)(vii) CN^(-)(ix) N_(2)^(-) total number of species which have fractional bond order.

Answer»


Solution :`to` molecular orbital configuration for UPTO 14 electrons
`sigma_(1s)ltoverset("*")(sigma_(1s))ltsigma_(2S)ltoverset("*")(sigma_(2s))ltpi_(2px)pi_(2py)ltsigma_(2px)ltoverset("*")(pi_(2px))=overset("*")(pi_(2py))ltoverset("*")(simga_(2px))`
For more than 14 electrons `sigma_(1s)ltoverset("*")(sigma_(1s))ltsigma_(2s)ltoverset("*")(sigma_(2s))ltpi_(2px)=pi_(2py))ltoverset("*")(pi_(2px))=overset("*")(pi_(2py))ltoverset("*")(pi_(2px))`
BOND order `=(1)/(2)` numberof electron in [Bonding M.O.-Antibonding M.O.]
Discussion
11157.

Which one of the following cannot be estimated by I_(2)?

Answer»

`SnCl_(2)`
`CU^(3+)`
`Na_(2)S_(2)O_(3)`
`H_(2)S`

Answer :B
Discussion
11158.

Whichof the following statementis worong aboutphoton ?

Answer»

Photon's energy is HV
Photo's restmass is ZERO
Momentum of photon is `(hv)/(c)`
Photon exertsno PRESSURE .

SOLUTION :Photon exerts pressure as it hasmomentum and enrgy.
Discussion
11159.

Which of the following metal hydroxide is the least basic ?

Answer»

`MG(OH)_(2)`
`Ca(OH)_(2)`
`Sr(OH)_(2)`
`Ba(OH)_(2)`

Solution :Basic character of the hydroxides of alkaline earth METALS INCREASES down the group.
Discussion
11160.

What is an electric resistance ? Give note on it.

Answer»

Solution :* The electrical resistance of any object is directly proportional to its length L and inversely proportional to its AREA of cross section A. That is, `R prop (l)/(A)`
* `(R=rho((l)/(A)))` Where, `rho=`equilibrium constant The constant of proportionality.
`rho` (Greek, rho) is called resistivity (specific resistance).
* The electrical resistance is represented by the SYMBOL .R. and it is measured in ohm `(Omega)`.
* Its SI base units is equal to ` (kg" " m^(2))/(S^(3)A^(2))`. It can be measured with the help of a Wheatstone BRIDGE.
* Where, A=area and S=time
1 ohm `=1Omega=1(kg" "m^(2))//(S^(3)A^(2))`
`1Omega" "m=100Omega" cm or "1Omega" cm"=0.01Omegam`
Discussion
11161.

What are the characteristiics of the following : (i) Multimolecular colloids (ii) Lyophobocsols (iii)Emulsions.

Answer»
Discussion
11162.

Which solutions has the highest pH value

Answer»

1M KOH
`1M H_(2)SO_(4)`
Chlorine water
Water containing CARBON dioxide

Solution :1 MKOH show HIGHEST pH VALUE because it is a strong base.
Discussion
11163.

Which one of thefollowing is a condensation polymer ?

Answer»

Nylon
Polythene
PVC
Teflon

Answer :A
Discussion
11164.

What is the difference in the nature of a dilute soap solution and a concentration soap solution ?

Answer»

SOLUTION :DILUTE soap soluton behaves like a TURE solution WHEREAS concentrated soap solution behaves like a COLLOIDAL solution.
Discussion
11165.

Which of the following statements are not correct ? (I)Both Cr^(2+) and V^(2+) can liberate H_(2) from a dilute acid (II) Mn_(2) O_(7) is more acidic than MnO_(2) and Mn_(3) O_(4) (III) Oxidising power follows the sequence : VO_(2)^(+) gt Cr_(2) O_(7)^(2-) gt MnO_(4)^(-) (IV) Lu(OH)_(3) is more basic than La(OH)_(3)

Answer»

I , IV
III , IV
II , IV
II , III

Answer :B
Discussion
11166.

The role of phosphate in detergent powder is to

Answer»

control pH LEVEL of the detergent WATER mixture
remove `Ca^(2+)` and `Mg^+` IONS from the water that cause the hardness of water
provide whiteness to the fabrics
form SOLID detergents as PHOSPHATE less detergents are liquid in nature

Answer :B
Discussion
11167.

When a compound X reacts with ozone in aqueous medium, a compound Y is prouduced. Ozone also react with Y and produces Z. Z acts as an oxidising agent, then X,Y and Z will be:

Answer»

`X=HI,Y=I_(2) " and " Z=HIO_(3)`
`X=KI,Y=I_(2) " and " Z=HIO_(3)`
`X=KI,Y=I_(2) " and " Z=HIO_(4)`
`X=HI,Y=I_(2) " and " Z=HIO_(4)`

ANSWER :A::B
Discussion
11168.

Which of the following sugars is present in genetic factor DNA molecule :

Answer»

Glucose
Maltose
Ribose
Deoxyribose

Answer :D
Discussion
11169.

Which of the following complex will show optical activity ?

Answer»

`trans-[Co(NH_(3))_(4)Cl_(2)]^(+)`
`[Cr(H_(2)O)_(6)]^(3+)`
`cis-[Co(NH_(3))_(2)(EN)_(2)]^(3+)`
`trans-[Co(NH_(3))_(2)(en)_(2)]^(3+)`

ANSWER :C
Discussion
11170.

Zone refining is used for the

Answer»

CONCENTRATION of an ore
Reduction of METAL oxide
Purification of metal
purification of an ore

Answer :C
Discussion
11171.

Which of the following statement regarding the metallurgy of magnesium using electolytic method is not correct ?

Answer»

ELECTROLYTE is magnesium chloride containing a littlr of NaCl and NaF
Air TIGHT iron pot acts as a cathode
Electrolysis is done in the ATMOSPHERE of coal gas .
MOLTEN magnesium is having than the electrolyte.

Answer :D
Discussion
11172.

which of thefollowingis notthecharacteristic of ionicsolids?

Answer»

Very low value of electrical conductivity in the MOLTEN state
Brittle NATURE
Very strong forces of INTERACTIONS
Anisotropic nature

ANSWER :A
Discussion
11173.

When salicylic acid is treated with acetic anhydride we get

Answer»

Aspirin
Paracetamol
Salol
None of these

Solution :
Discussion
11174.

What do you understand by the 'order of a reaction' ? Identify reaction order from each of the given units of rate constant : (i)L^(-1)."mol".s^(-1)(ii)L^(-1)."mol".s^(-1)

Answer»

Solution : 2nd Part : (i) `"mol.L"^(-1).s^(-1)rarr` ZERO order reaction.
(ii) `"L. mol"^(-1).s^(-1)rarr` SECOND order reaction.
Discussion
11175.

Which one of the following statements about diborane is NOT true

Answer»

the B atoms in it are `sp^(3)` hybridised
It CONTAINS two 3-centre-2-electron BONDS
All B-H bonds lengths in it are equal due to resonance
The MOLECULE is non-planar

Answer :D
Discussion
11176.

Which of the following solvent will be able to dissolve dioxygen appreciable?

Answer»

1, 2, 3- trithydroxy benzene
Benzene
Toluene
Water

Answer :A
Discussion
11177.

When chlorine is passes through concentrated solution KOH, the compound formed is:

Answer»

`KClO_5`
`KClO_3`
`KClO_2`
`KClO_4`

ANSWER :B
Discussion
11178.

Write Gibb's Helmholtz equation. For a process , if Delta H and T Delta S are positive and T Delta S gt Delta H, predict the spontaneity of the process.

Answer»

Solution :`Delta G= Delta H-T Delta S OR `
`Delta G^@=Delta H^@- T Delta S^@`
The PROCESS is SPONTANEOUS.
Discussion
11179.

Which of the following complexes is an outer orbital complex?

Answer»

`[Fe(CN)_6]^(4-)`
`[Ni(NH_3)_6]^(2+)`
`[Co(NH_3)_6]^(3+)`
`[Mn(CN)_6]^(4-)`

Answer :B
Discussion
11180.

water is brought to boil under a pressure of 1.0 atm. When an electric current of 0.50 A from 12 V supply is passed for 300 s through a resistance in thermal contact with it , it found that 0.798 g of water is vaporised . Calculate the molar internal energy change at boiling point (375 .15 K).

Answer»

` 37 .5 kJ mol ^(-1)`
`3.75 kJ mol ^(-1)`
`42.6 kJ mol ^(-1)`
` 4 .26 kJ mol ^(-1)`

Solution :`DELTAH`=work done =`ixxVxxt=0.5 A xx12 V xx300 s`
`1800 J =+1.8 kJ`
molar enthaply of vaporisation,
`DeltaH_(m)=(DeltaH)/(moles of H_(2)O)=(DeltaH)/n_(H_(2)^(O))=(1.8kJ)/(0.798/18)=40.6 kJ mol^(-1)`
`DeltaH_(m)=DeltaE_(m)+P DeltaV`
`DeltaH_(m)=DeltaE_(m)+Deltan_(g)RT`
`DeltaH_(m)=DeltaE_(m)+RT`
molar internal energy change , `DeltaE_(m)=DeltaH_(m)-RT`
`=40.6-8.314xx10^(-3)xx373.15=37.5 kJ mol^(-1)`
Discussion
11181.

Tthethermaldecompostionof alkanesis known as :

Answer»

cracking
isomerisation
DEHYDRATION
reformaing

ANSWER :A
Discussion
11182.

Which of the following statement is not true about Mohr's salt

Answer»

It decolourises `KMnO_(4)`
It is a primary standard
It is a double salt
Oxidation state of IRON is `+3` in this salt

Solution :Oxidation state of iron in mohr's salt
`FeSO_(4)(NH_(4))_(2)SO_(4).6H_(2)O" is "+2.`
Discussion
11183.

Which of the following compound undergo nucleophilic substitution faster?

Answer»




ANSWER :D
Discussion
11184.

Which of the following synthesis gives 3-methyl -1- hexanol ?

Answer»

2- Bromohexance ` overset("Mg") underset("dry ETHER")tooverset("(i) HCHO") underset("(ii)" H_(3)O^(+)) to `

3- Bromopentane`overset("Mg") underset("dry ether ") tooverset("(i) CH_(3)CHO) underset((ii) H_(3)O^(+)) to`
1- Bromobutane` overset("Mg") underset("dry ether") tooverset((i) CH_(3)COCH_(3)) underset((ii) H_(3)O^(+))to`

Answer :B
Discussion
11185.

The reduction of aldehydes and ketones to the corresponding alkanes in presence of alkaline hydrazine solution is called:

Answer»

MPV reaction
stephen reduction
Wolf Kishner reduction
Cannizzaro's reaction

Answer :C
Discussion
11186.

The standard reduction potential of E_(Bi^(3+)//Bi)^(@) and E_(Cu^(2+)//Cu)^(@) are 0.226 V and 0.344 V respectively. A mixture of salts of Bi and Cu unit concentration each is electrolysed at 25^(@)C. To what value can [Cu^(2+)] be brought down before bismuth starts to deposit during electrolysis ?

Answer»


ANSWER :`10^(-4) M;`
Discussion
11187.

What would be energy order of d-orbitals of tetrahedral complexes when they undergo splitting ?

Answer»

`d_(XY) ~= d_(y_2) ~= d_(xz) lt d_(x^2-y^2)~= d_z^2`
`d_(x^2- y^2) ~= d_z^2 lt d_(xy) ~= d_(yz) ~= d_(xy)`
`d_(xy) ~= d_(z^2) lt d_(yz) ~= d_(xz) ~= d_(x^2-y^2)`
`d_(x^2-y^2) ~= d_(xz) lt d_(xy) ~= d_(yz) ~= d_z^2`

Solution :Tetrahedral COMPLEXES Splitting of d-orbitals as per CFT is `underset"EG"((d_(x^2-y^2)-=d_z^2)) lt underset(t_"2G")((d_"xy" -= d_"yz" -=d_"xz"))`
Discussion
11188.

Which does not react with Fehling solution ?

Answer»

Ethanal
Glucose
Formic acid
Benzaldehyde

Solution :Fehling solution is weak OXIDISING agent and benzaldehyde is weak REDUCING agnet. HENCE, it does not react with Fehling solution . Formic acid, glucose, ethanal contains CHO - group.
Hence , they REDUCE Fehling solution.
Discussion
11189.

Which will undergo Fredel-Crafts alkylation reaction easily ?

Answer»




SOLUTION :Fridel crafts alkylation is an ELECTROPHILIC SUBSTITUTION REACTION, hence it occurs, readly with COMPOUNDS having electron releasinggroups.
Discussion
11190.

Which polymer is useful as a lubricant ?

Answer»

ORLON
TEFLON
DACRON
NYLON

SOLUTION :Teflon
Discussion
11191.

What is the SI unitof denisty?

Answer»

G `CM^(-3)`
`g m^(-3)`
`KG m^(-3)`
`kg cm^(-3)`

SOLUTION :`kg m^(-3)`
Discussion
11192.

There are 20 naturally occuring amino acids. The maximum number of tripeptides that can be obtained is

Answer»

6470
7465
5360
8000

Solution :SINCE there are 20 naturally ocurring amino acids,
`:.` MAXIMUM no. of ripeptides that can be obtainees are `=(20)^(3)=8000`.
Discussion
11193.

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 KI solution
1 M `AgNO_(3)` solution, 1 M `Cu(NO_(3))_(2)` solution
1 M KCl solution, 1 M NaCl solution

Solution :(a) `CuSO_(4)toCu+O_(2),CuCl_(2)toCu+Cl_(2)`
(b) `KCl toH_(2)+Cl_(2),KItoH_(2)+I_(2)`
(C) `AgNO_(3)toAg+O_(2),Cu(NO_(3))_(2)toCu+O_(2)`
(d) `KCl to H_(2)+Cl_(2),NaCl toH_(2)+Cl_(2)`
(E) `CuBrtoCu+Br_(2),CuSO_(4)toCu+O_(2)`
Thus, KCl and NaCl solutions give the same products at anode and cathode.
Discussion
11194.

The thermal decomposition of acetaldehyde , CH_(3)CHO to CH_(4)+CO, has rate constant of 1.8xx10^(-3)"mole"^(-1//2)L^(1//2)min^(-1) at a given temperature. How would (d[CH_(3)CHO])/(dt) will change if concentration of acetaldehyde isdoubled keeping the temperature constant ?

Answer»

Will INCREASE by `2.828` times
Will increase by `11.313` times
Will not change
Will increase by `4` times

Answer :A
Discussion
11195.

X gives white turbidity with Lucas reagent instantly. X and Y both turn blue litmus solution red. Y can be:

Answer»

<P>p- HYDROXY BENZOIC acid
p - Hydroxy benzaldehyde
m - Hydroxy benzoic acid
p - Hydroxy BENZYL alcohol

Answer :A
Discussion
11196.

underset((X))(C_(4)H_(8)O_(4))overset(LiAlH_(4))rarroverset(HBr)rarroverset(NaCN)rarroverset(H_(3)overset(oplus)O,CaO)underset(Delta)rarrYoverset(CaO, Delta)larr hexanedioic acid :

Answer»




ANSWER :B::C
Discussion
11197.

Which of the following two substances react to form Blister copper?

Answer»

`Cu_2 + FeS_2`
`Cu_2S + O_2` 
`Cu_2O + FES`
`Cu_2S + Cu_2O`

ANSWER :B
Discussion
11198.

Van der Waal's equation for n moles of a gas is

Answer»

`(P+(N^(2)a)/(V^(2)))(V-nb)=nRT`
`(P+(na)/(V^(2)))(V-nb)=RT`
`(P+(a)/(V^(2)))(V-b)=nRT`
`(P+(n^(2)a)/(V^(2)))(V-b)=ER`

Solution :Van der Waal.s equation for n moles of a gas is as FOLLOWS.
`(P+(n^(2)a)/(V^(2)))(V-nb)=nRT`
Discussion
11199.

Which reference electrode is used to measure the electrode potential of other electrodes ?

Answer»

SOLUTION :* Standard Hydrogen electrode
* Reduction potential of standard hydrdogen electrode is ACCEPTED to be ZERO volt. And so it is considered to be REFERENCE electrode to measure the electrode potential of any electrode.
Discussion
11200.

Which of the following is not true for ozone ?

Answer»

It is a strong sterilizing agent
It attacks organic compounds containing carbon-carbon doubles bond
Its molecular is linear and has two different O-O bond lengths
It is more powerful oxidising agent than molecular oxygen

Solution :It is a bent molecule and is the resonarnce hybrid of following two forms, due to which all O-O bonds are equivalent.O-O bond length (128 pm) is smaller than O-O single bond (148 pm), but larger than O double bond (110 pm).

a) `O_3` is also used as disinfectant. Its advantage over chlorine for purifying drinking water is that it avoids the unpleasant smell and bad taste of chlorine.
b) Reaction of alkene with `O_3`, followed by TREATMENT with Zn in presence of water to FORM carbonyl compounds is CALLED ozonolysis.
`ge C=C le underset(2. Zn//H_(2)O)overset(1. O_(3))to ge C=O+O=C le`
(d) After `F_2, O_3` is most powerful oxidant, e.g.,
`PbS+4O_(3) to PbSO_(4)+2O_(2)`
Discussion