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451.

Which statements is wrong about enantioners?

Answer»

They ROTATE PPL to DIFFERENT direction
Normally they posses same physical PROPERTIES
The shape of ther crystals are same
Their chemical properties are same.

ANSWER :C
Discussion
452.

The weight of sodium carbonate required to prepare 500 ml of a semi-normal solution is

Answer»

13.25 g
26.5 g
53 g
6.125 g

Solution :`N=(W xx1000)/(eq.wt. xx " volume in ml.")eq.wt.=(106)/(2)=53`
`w=(0.5xx53xx500)/(1000)=13.25`.
Discussion
453.

Which of the following is incorrect about the reaction,

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HEAT of combustion of `C_D=-94.3 KCAL`.
Heat of formation of `CO_2=-94.3kcal`
`triangleH=triangleU`
STANDARD heat of formation of `CO_2`

ANSWER :D
Discussion
454.

Which order is correct spectrochemical series of ligands?

Answer»

`CL^(-) lt F^(-) lt C_(2)O_(4)^(2-) lt NO_(2)^(-) lt CN^(-)`
`CN^(-) lt C_(2)O_(4)^(2-) lt Cl^(-) lt NO_(2)^(-) lt F^(-)`
`C_(2)O_(4)^(2-) lt F^(-) lt Cl^(-) GT NO_(2)^(-) lt CN^(-)`
`F^(-) lt Cl^(-) lt NO_(2)^(-) lt CN^(-) lt C_(2)O_(4)^(2-)`

Answer :A
Discussion
455.

The standard electrode potential of Zn^(2+)//Zn and Ag^(+)//Ag are -0.763 and +0.799V respectively. The standard potential of the cell is:-

Answer»

1.56V
0.036V
`-1.562`V
0.799V

Solution :`E_(CELL)^(o)=E_("CATHODE")^(o)-E_("ANODE")^(o)=0.799-(-0.763)=1.562V`
Discussion
456.

Which of the following complexes are not correctly matched with the hybridisation of their central metal ion ? (i) [Ni(CO)_(4)]sp^(3) (ii) [Ni(CN)_(4)]^(2-)sp^(3) (iii) [CoF_(6)]^(3-)d^(2)sp^(3) (iv) [CoF_(6)]^(3-)d^(2)sp^(3) Select the correct answer using the codes below :

Answer»

(i) and (II)
(i) and (iii)
(ii) and (iv)
(ii), (iii) and (iv)

Solution :`Ni(CO)_(4)=sp^(3), [Ni(CN)_(4)]^(2-)=DSP^(2)`,
`[CoF_(6)]^(3-)=sp^(3)d^(2),[Fe(CN)_(6)]^(3-)=d^(2)sp^(3)`.
[`Fe^(-)` is a WEAK ligand and cannot force d electrons to pair up FORMING outer orbital complex).
Discussion
457.

Which of the following reactions are correct

Answer»




SOLUTION :
Discussion
458.

Which of the reaction defines molar DeltaH_(f)^(0)?

Answer»

`CaO(s) + CO_(2)(g) rarr CaCO_(3)(s)`<BR>`(1)/(2)Br_(2)(l) + (1)/(2)H_(2)(g) rarr HBr(g)`
`N_(2)(g) + 2H_(2)(g) + (3)/(2)O_(2)(g) rarr NH_(4)NO_(3)(s)`
`(1)/(2)I_(2)(s) + (1)/(2)H_(2)(g) rarr HI(g)`

Solution :N//A
Discussion
459.

Which of the following is not precipitated as sulphide by passing H_2S gas in the presence of conc. HCI ?

Answer»

COPPER
ARSENIC
Lead
Cadmium.

Solution :CDS is not precipitated in conc. `HCl ` MEDIUM. For precipitation , the solution has to be DILUTED.
Discussion
460.

Which of the following condition favours the reduction of a metal oxide to metal ?

Answer»

`DeltaH= +ve, T DeltaS` =+ ve at LOW TEMPERATURE
`DeltaH=+ ve, T DELTA S`= - ve at any temperature
`Delta H= - ve, T Delta S`= - ve at HIGH temperature
`Delta H= - ve, T Delta S`= + ve at any temperature

Answer :D
Discussion
461.

When the temperature of an ideal gas is increased from 27^(@)C to 927^(@)C, the kinetic energy will be

Answer»

same
eight times
four times
twice

ANSWER :C
Discussion
462.

Two reactions (i) A to P (ii) BtoPfollow first-order kinetics. The rate of the reaction(i) is doubled when the temperature is raised from 300 K to 310 K. The half-life for this reaction at 310 K is 30 minutes. At the same temperature B decomposes twice as fast as A. If the energy of activation for the reaction (ii) is half that of reaction (i), calculate the rate constant of the reaction (ii) at 300 K.

Answer»

Solution :
GIVEN that `2k_1 = (0.6930)/(30) , (2k_1)/(k_2)= 1/2` and `E_1/E_2 = 2`
`3.23 xx 10^(-2) "MIN"^(-1)`
Discussion
463.

Which force is strongest ?

Answer»

DIPOLE-dipole forces
Ion-ion forces
Ion-dipole forces
Ion- INDUCED dipole forces

Answer :B
Discussion
464.

Which of the following reacts with water?

Answer»

`CHCI_(3)`
`CH_(3)-CHO`
` C Cl_(4)`
`ClCH_(2)CH_(2)Cl`

ANSWER :B
Discussion
465.

Which of the following constitute irreversible colloidal system in water as dispersion medium-

Answer»

Clay
Platinum
`FE(OH)_(3)`
All of these

Answer :D
Discussion
466.

Write tests of distinguish between : (ii) C_(6)H_(5)-OH and CH_(3)COOH.

Answer»

SOLUTION :Phenol does not GIVE brisk effervescence but `CH_(3)COOH` GIVES this test with `NaHCO_(3)`.
Discussion
467.

Write the structures and names of all the stereoisomers of the following compounds: [Co(en)_(3)]Cl_(3)

Answer»

Solution :`[CO(en)_(3)]Cl_(3)`

tris ( ethane-1, 2, diarnine) CHLORIDE/ cobalt(III) ion
Discussion
468.

Which equation gives the relationship between equivalent or molar conductance and concentration of a strong electrolyte?

Answer»

SOLUTION :Debye-Huckel-Onsagar equation, `WEDGE=wedge^(@)-Asqrt(c)` in which `wedge` is the molar conductance at concentration c, `wedge^(@)` is the molar conductance at INFINITE and A is a constant.
Discussion
469.

Which of the following is a benzylic halide ?

Answer»




ANSWER :B
Discussion
470.

Which carbonyl group is protonated most readily in acidic solution, but gives nucleophilic addition by NH_4NH-Ph least readily ?

Answer»




SOLUTION :
Discussion
471.

When 10A currentis passed for 80 min,the volume of hydrogen gas liberated is

Answer»

11.14L
5.57L
22.4L
2.78L

Solution :`H^(+) to underset(1F)(E^(-)) to (1)/(2)H_(2)`
At STP ,
`:'` 96500 C LIBERATES =11.2`H_(2)`
`:. 10xx80xx60C` will liberate `=(11.2xx10xx80xx60)/(96500)LH_(2)`
=`5.57L` hydrogen gas
Discussion
472.

When the same amount of zinc is treated separately with excess of sulphuric acid and sodium hydroxide, the ratio of volumes of hydrogen evolved is:

Answer»

1:1
1:2
2:1
9:4

Answer :A
Discussion
473.

Why are injectable medicines dissolved in saline water before being administered ?

Answer»

SOLUTION :Both BECOME ISOTONIC.
Discussion
474.

Weighing 3104 carats (1 carat=200mg), the Cullinan diamondwas the largest natural diamond ever found. How many carbain atoms were present in the stone?

Answer»

Solution :Mass of the STONE
=3104`xx`200=620800mg=620.8g .
NUMBER of ATOMS of carbon
`=("Mass in gram")/("Gram-atomic mass")xx6.023xx10^(23)` LTBR. `=(620.8)/(12)xx6.023xx10^(23)=3.12xx10^(25)`
Discussion
475.

Which one of the following compounds is prepared in the laboratory from benzene by a substitution reaction

Answer»

Glyoxal
Cyclohexane
ACETOPHENONE
Hexabromo cyclohexane

Solution :
It is Friedel-Crafts REACTION. Acetophenone
Discussion
476.

What is Haber's process? (or) How is ammonia synthesized by Haber's process ?

Answer»


Solution :Direct reaction of NITROGEN with hydrogen GIVES ammonia. This reaction is favored by HIGH pressures and at optimum temperature in PRESENCE of iron catalyst.
`1/2 N_(2)+3/2 H_(2) hArr 2NH_(3) Delta H_(f)=-46.2kJ "MOL"^(-1)`
Discussion
477.

Which does not use sp^3 - hybrid orbitals in its bonding?

Answer»

`BeF_3^-`
`OH_3^+`
`NH_4^+`
`NF_3`

ANSWER :A
Discussion
478.

Write the products

Answer»

SOLUTION :
Discussion
479.

Which of the following compounds has cis configuration at each double bond ?

Answer»




ANSWER :B::D
Discussion
480.

Which one of the following inhibits the initiation of protein synthesis?

Answer»

STREPTOMYCIN
ERYTHROMYCIN
atenolol
AMLODIPINE

SOLUTION :streptomycin
Discussion
481.

Which of the following statement(s) is (are) correct with reference to the ferrous and ferric ions?

Answer»

 `FE^(3+)` gives brown COLOUR with potassium ferricyanide.
`Fe^(2+)` gives blue precipitate with potassium ferricyanide
`Fe^(3+)` gives red colour with potassium thiocyanate
`Fe^(2+)` gives brown colour with AMMONIUM thiocyanate.

Answer :B::C
Discussion
482.

What do you mean by buffer action?

Answer»

SOLUTION :(i) To RESIST changes in its PH on the addition of an ACID (or) a base, the buffer solution should contain both acidic as well as basic COMPONENTS so as to neutralize the effect of added acid (or) base and at the same time, these componentsshould not consume each other.
(ii) Let us explain the buffer action in a solution containing `CH_3COOH and CH_3 COONa`.
(iii)The dissociation of the buffer components occurs as below.
`CH_3 COOOH_((aq)) hArr CH_3 -COO_((aq))^(-)+H_3 O_((aq))^(+)`
`CH_COONa_(s) overset(H_2O(I))(to )CH_3-COO_((aq))^(-) +Ha_((aq))^(+)`.
Discussion
483.

Which of the following compounds will show geometrical isomerism

Answer»

CYCLOHEXENE
2-hexene
3-hexyne
1, 1-diphenylethylene

Solution :Cyclohexene is unsubstituted compound.
Hexene EXHIBIT geometrical ISOMERISM :

In 3-hexyne,the triply bonded atoms have only one substituent each.
In 1, 1-diphenylethylene, one double bonded carbon atom has two similar GROUPS.
Discussion
484.

Which of the following is considered as a synthetic element ?

Answer»

Thorium
Lead
Plutonium
Uranium.

Answer :C
Discussion
485.

Two oxides of nitrogen contain the following percentage compositions : (i) Oxide A contains 63.64% nitrogen and 36.36% oxygen. (ii) Oxide B contains 46.67% nitrogen and 53.33% oxygen. Establish the Law of Multiple Proportions.

Answer»

Solution :CALCULATE the mass of the oxygen COMBINED with 1.0 g of NITROGEN in each CASE which are 0.571 g and 1.143 g, i.e., in the ratio `1:2`
Discussion
486.

Which one is not correct

Answer»

Rate of ZERO order reaction depends upon initial concentration of reactant
Rate of zero order reaction does not DEPEND upon initial concentration of reactant
`t_(1//2)` of first order reaction is independent of initial concentration of reactant
`t_(1//2)` of zero order reaction is dependent of initial concentration of reactant

Solution :The rate of zero order reaction is independent of the concentration of the reactants or the concentration of the reactant do not CHANGE with TIME . Thus , the rate of reaction remains constant.
Discussion
487.

The weight of 1 litre of ozonised oxygen at STP was found to be 1.5gm. When 100 ml of this mixture at STP was treated with turpentine oil, the volume was reduced to 90 ml. The molecular weight of ozone is

Answer»

49
47
46
47.9

Solution :Volume of `O_(3)` in 100ml of ozonised OXYGEN = 100 - 90 =10ml
Volume of `O_(3)` in 1000ml of ozonised oxygen = 100 ml
Volume of `O_(3)` in 1000 ml of `O_(2)` at STP = `(900 XX 32)/(22400)` = 1.2869 GRAMS
Weight of 100 ml of `O_(3)` at STP = 1.5 - 1.286=0.214 grams
100ml of `O_(3)` at STP ................ ? = 47.94 grams
Discussion
488.

Which one is known as Caro's acid ?

Answer»

`H_(2)SO_(5)`
`H_(2)SO_(3)`
`H_(2)SO_(4)`
`H_(2)SO_(4).NO.`

ANSWER :A
Discussion
489.

Which of thefollowingreagentscan beusedto convertalkylhalideintoalkane ?

Answer»

Actionof Grignardreagent
ACTION of `Bu_(3)SNH`
Action of SUPERACID
Actionof `K^(+)O^(-)C(CH_(3))`

Answer :(1,2)
Discussion
490.

Which of the carbonates given below is unstable in air and is kept in CO_(2) atmosphere to avoid decomposition.

Answer»

`BeCO_(3)`
`MgCO_(3)`
`CaCO_(3)`
`BaCO_(3)`

Answer :A
Discussion
491.

Which of thefollowingstatementsaboutphotochemicalsmogis wrong ?

Answer»

It hashighconcentration of oxidsingagents
It haslowocncentrationof oxidisingagents
it canbe contgrolledoxidisingagents releaseof `NO_(2) ` hydrocarbonsozone etc.
PLANATATION of some PLANTS LIKE pinus helpsin controllingphotochemicalsmog.

Solution :Photochemicalsmog isoxidisingin NATURE becaue it contains LARGECONCENTRATION oxidisingagentssuch `O_(2)` and `NO_(2)`
Discussion
492.

Write the formula for the following complex : Potassium trioxalatochromate(III).

Answer»

SOLUTION :Potassium trioxalatochromate(Ill)
`K_(3)[Cr(C_(2)O_(4))_(3)]`
Discussion
493.

Van't Hoff factor i is given by the expression …………………… .

Answer»

`i=("Normal molar mass")/("ABNORMAL molar mass")`
`i=("Abnormal molar mass")/("Normal molar mass")`
`i=("Observed colligative property")/("CALCULATED colligative property")`
`i=("Calculated colligative property")/("Observed colligative property")`

Answer :a,C
Discussion
494.

What is the significance of Henry's law constant K_H?

Answer»

SOLUTION :Higher the value of Henry.s LAW CONSTANT, lower is the solubility of the gas.
Discussion
495.

Write the IUPAC names of the following coordination compounds : [Co(NH_(3))_(6)]Cl_(3)

Answer»

SOLUTION :HEXAAMMINECOBALT(III) CHLORIDE
Discussion
496.

Which of the following compounds will give racemic mixture on nucleophilic substitution by OH^(-) ion ? (a) CH_(3) - underset(C_(2)H_(5))underset(|)CH - Br "" (b) CH_(3) - underset(C_(2)H_(5))underset(|) overset(Br) overset(|) C - CH_(3) "" (c ) CH_(3) - underset(C_(2)H_(5)) underset(|) CH - CH_(2)Br

Answer»

`(a) `
`(a), (B) , (C ) `
`(b), (c ) `
`(a), (c ) `

ANSWER :a
Discussion
497.

Write the products

Answer»

SOLUTION :
Discussion
498.

Write the products

Answer»

SOLUTION :`UNDERSET("2-methyl PROPENE")(CH_3- oversetunderset(|)(CH_3)(C) = CH_2 +H_2O)`
Discussion
499.

Write the products

Answer»

SOLUTION :
Discussion
500.

Write the products

Answer»

SOLUTION :
Discussion