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5451.

Write the differences between the rate and rate constant of the reaction.

Answer»

SOLUTION :
Discussion
5452.

Which of the following statements is/ are correct about lattice enthalpy?

Answer»

LATTICE enthalpy affects the SOLUBILITIES of IONIC compounds
Stability of an ionic compound DEPENDS on its lattice enthalpy
MAGNITUDE of lattice enthalpy depends upon both charge and size of ions.
All of these

Answer :D
Discussion
5453.

Which of the following ore is best concentrated by froth- floatation method

Answer»

Galena
Cassiterite
Magnetite
Malachite

Solution :CYANIDE PROCESS is used in the extration of both Silver and Gold because these from complex SALT with `CN^(-)` ION due to presence of lone pair of electron on NITROGEN atom.
Discussion
5454.

Which of the following statements about diamond are correct ? 1.It is used as a gem in jewellery because of its ability to reflect light. 2. It is good conductor of electricity . 3. It is used for cutting glass, marble stones and other hard materials. 4.It is used for drilling of rocks. Select the correct answer using the codes given below.

Answer»

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

Solution :Diamond , an ALLOTROPE of carbon, has very high refractive because of which it is USED as a grm in jewellery.It is used for cutting GLASS, marble stones and other hard materials and for drilling of ROCKS . It is a bad conductor of electricity . It is the hardest material known.
Discussion
5455.

What is mixture of dextro and levo isomers called ?

Answer»

RACEMIC MIXTURE
Optical ACTIVE
Resonance mixture
All of the GIVEN

Answer :A
Discussion
5456.

The total pressure exerted in ideal binary solution is given by P = P_(A)^(@)X_(A) + P_(B)^(@) X_(B) " where " P_(A)^(@) & P_(B)^(@) are the respective vapour pressure of pure components and X_(A) & X_(B) are their mole fraction in liquid phase. And composition of the vapour phase is determined with the help of Dalton's law of partial pressure. Y_(A) = (P_(A)^(@) X_(A))/(P) If total pressure exerted in an ideal binary solution is given by P = (5400)/(60 + 30Y_(A))mm " of " Hg. The value of P_(A)^(@) is

Answer»

40MM of Hg
30 MM of Hg
60 mm of Hg
90 mm of Hg

Answer :C
Discussion
5457.

Which of the following are negatively charged sols ?

Answer»

Gold sol
PRUSSIAN BLUE DAY
Haemoglobin
Starch .

ANSWER :A::D
Discussion
5458.

Which are the structural parts of the cell membrane ?

Answer»

Lipid
Carbohydrates
(A) and (D) both
Protein

Solution :(A) and (D) both
Discussion
5459.

Which of the following equilibrium is not rapid at room temperature

Answer»




ANSWER :C
Discussion
5460.

Which of the following is arranged in order of increasing density

Answer»

`AlltMgltC_(("GRAPHITE"))ltB`
`BltAlltMgltC_(("graphite"))`
`C_(("graphite"))ltAlltBltMg`
`MgltC_(("graphite"))ltBltAl`

Solution :ALUMINIUM will have the MAXIMUM density in the group.
Discussion
5461.

Which of the most suitable reagent for the following conversion?

Answer»

`l_(2)` and NaOH solution
Tollen's reagent
SN and NaOH solution
Benzoyl peroxide

Solution :Idoform TEST conversts `--overset(O)overset(||)(C )-CH_(3)` group to -COOH
Discussion
5462.

Which of the following statements are correct when a mixture of NaCl and K_(2)Cr_(2) O_(7)is gently warmed with conc. H_(2)SO_(4) ?

Answer»

a deep red vapour is evolved
The vapour when passed into NaOH SOLUTION GIVES YELLOW solution of `Na_(2)CrO_(4)`
chlorine gas is evolved
chromyl chloride is formed

Solution :Deep red vapours ofchromyl chloride are formed which on passium throughNaOH solution give a yellow solutionof `Na_(2)CrO_(4)`.
Discussion
5463.

Which of the following damages WBC, bone-marrow and lymph nodes

Answer»

`I^131`
`Ca^40`
CAESIUM
`Sr^90`

Solution :`I^131` ENTER in human body through `H_2O` or food chain and damage WBC can CAUSE tumour formation, SKIN cancer and sterility
Discussion
5464.

Which burns to form an oxide which is gas at room temperature ?

Answer»

Hydrogen
Phosphorus
Sodium
Sulphur

Answer :D
Discussion
5465.

Which element among the lanthanide has smallest atomic size ?

Answer»

Ce
Lu
Eu
Gd

Answer :B
Discussion
5466.

The type of hybrid orbitals used by OF_(2) is

Answer»

`DSP^(2)`
`SP^(3)`
`sp^(2)`
sp

Answer :B
Discussion
5467.

What is the product formed when acetylene reacts with hypochlorous acid?

Answer»

`CH_3COCl`
`ClCH_2 CHO`
`Cl_2CHCHO`
`ClCH_2 COOH`

ANSWER :C
Discussion
5468.

Which of the following will not give iodoform test? (CH_3OH,CH_3COCH_3,CH_3CHO,C_2H_5OH)

Answer»

SOLUTION :`CH_3OhH`
Discussion
5469.

Which one of the following is an inhalational general anaesthetic?

Answer»

procain
ISO flurane
lidocaine
rabeprazole

Solution : iso flurane
Discussion
5470.

Which ore contains both iron and copper ?

Answer»

Cuprite
CHALCOCITE
CHALCOPYRITE
malachite

ANSWER :C
Discussion
5471.

The relative lowering of vapour pressure of an aqueous solution of urea is 0.018. If K_(b) for H_(2)O is 0.54^(@)m^(-1), the elevation in boiling point will be

Answer»

`0.54^(@)C`
`0.18^(@)C`
0.54 K
0.18 K

Answer :A::C
Discussion
5472.

What is the basic difference between nylon 6 and nylon 6, 6?

Answer»

SOLUTION :NYLON 6 is an addition polymer WHEREAS nylon-6, 6 is a CONDENSATION polymer.
Discussion
5473.

When nitric acid reacts with nitric oxide, a gas is released , which converts H_2S into

Answer»

`SO_(4)^(2-)`
`S^(2-)`
`S`
`S_2O_(5)^(2-)`

ANSWER :C
Discussion
5474.

The least stable oxide at room temperature is

Answer»

CUO
`Sb_2O_3`
ZNO
`Ag_2O`

Solution :`Ag_(2)O, Delta G^(0) f` (Ellighan diagram )
Discussion
5475.

What type of cell is a lead storage battery ? Write the anode and the cathode reactions and the overall cell reaction occurring in the use of a lead storage battery.

Answer»

Solution :Lead storage battery is a SECONDARY cell that can be charged by passing a CURRENT. Reactions occurring in the lead storage battery while OPERATING (during discharge) are:
`{:("At cathode", PbO_(2) + SO_(4)^(2-) + 4H^(+) + 2E^(-) to PbSO_(4) + 2H_(2)O),("At anode", Pb + SO_(4)^(2-) to PbSO_(4) + 2e^(-)),("OVERALL reaction", Pb + PbO_(2) + 2H_(2)SO_(4) to 2PbSO_(4) + 2H_(2)O):}`
Discussion
5476.

What happens when ethyl chloride is treated with aqeous KOH?

Answer»

Solution :Ethyl chloride undergoes hydrolysis to form ethyl alcohol.
`underset("Ethyl chloride")(CH_(3)CH_(2)-CL)+KOH(aq)to underset("Ethyl alcohol")(CH_(3)CH_(2)-OH)+KCL`
Discussion
5477.

When radium atom which is placed in II group, loses an alpha- particle, a new element is formed which should be placed in group?

Answer»

SECOND
FIRST
FOURTH
ZERO

ANSWER :D
Discussion
5478.

When an electric current is passed through acidulated water, 112 ml of hydrogen gas at NTP iscollected at the cathode in 965 seconds. The current passed in amperes is

Answer»

`1.0`
` 0.5`
` 0.1 `
`2.0`

ANSWER :A
Discussion
5479.

'The resultant heat change in a reaction is the same whether it takes place in one or several stages.'' This statement is called

Answer»

Lavoisier and LAPLACE LAW
Hess's law
Joule's law
Le-chatelier's principle

ANSWER :B
Discussion
5480.

When orange solution containing Cr_(2)O_(7)^(2-) ion istreated with an alkali , a yellow solution is formedand when H^(+)ions are added to yellow solution , an organge solution is obtained . Explain why does thi happen ?

Answer»

SOLUTION : This is DUE tothe following interconversion `:`
`underset("Dischromate (orange)")(Cr_(2)O_(7)^(2-)) underset(H^(+))OVERSET(OH^(-)) (HARR) underset("Chromate(yellow)")(CrO_(4)^(2-))`
Discussion
5481.

Which of the following is not equal to zero in a cyclic process ?

Answer»

`DELTAG`
`DeltaW`
`DeltaS`
`DELTAH`

Answer :B
Discussion
5482.

Two types of bonds in diborane are covalent and __________ bond.

Answer»

SOLUTION :3c-2e BRIDGE BOND,
Discussion
5483.

Which of the following is a saline oxide ?

Answer»

`Na_(2)O_(2)`
`BaO_(2)`
`Na_(2)O`
`Fe_(2)O_(3)`

SOLUTION :OXIDES which are more ionic in nature (salt-like) are KNOWN as saline oxides e.g. oxides of alkali metals.
Discussion
5484.

Which of the following mechanism is/are not seen during esterification reaction?

Answer»

`A_(AC^(2))`
`B_(AC^(1))`
`A_(AL^(2))`
`B_(AC^(2))`

ANSWER :B::C::D
Discussion
5485.

What is the order with respect to each of the reactant and overall order of the following reactions ? (a) 5Br_((aq))^(-)+BrO_((aq))^(-)+6H_((aq))^(+)rarr 3Br_(2(l))+3H_(2)O_((l)) The experimental rate law is Rate =k[Br^(-)][BrO_(3)^(-)][H^(+)]^(2) (b) CH_(3)CH_((g))overset(Delta)rarr CH_(4(g))+CO_((g)) the experimental rate law is Rate =k[CH_(3)CHO]^((3)/(2))

Answer»

Solution :(a) First order with respect to `Br^(-)`, first order with respect to `BrO_(3)^(-)` and second order with respect to `H^(+)`. Hence the overall order of the REACTION is equal to `1+1+2=4`
(b) Order of the reaction with respect to acetaldehyde is `(3)/(2)` and overall order is ALSO `(3)/(2)`
Discussion
5486.

van der Waals constant 'b' for a real gas is 0.02788 lit "mole"^(-1). Calculate the radius of the molecule of the gas.

Answer»

Solution :Volume of one molecule `= (4)/(3) pi r^(3)`
where r is the radius of the molecule.
`therefore` volume of 1 mole `= (4)/(3) pi r^(3) xx` Av. const.
(1 mole contains Av. const of molecules)
We have, `b = 4 xx (4)/(3) pi r^(3) xx` Av. const.
`b = 0.02788` lit/mole = 27.88 mL/mole (GIVEN).
`therefore 27.88 = 4 xx (4)/(3) xx (22)/(7) xx r^(3) xx 6.022 xx 10^(23)`
`therefore r = 1.4 xx 10^(-8) cm`.
Discussion
5487.

Two possible stereo - structures of CH_3CHOHCOOH, which are optically active, are called

Answer»

ENANTIOMERS
Meomers
Diastereomers
Atropisomers

ANSWER :A
Discussion
5488.

True statement(s) regarding the given molecule is/are

Answer»

This is optically inactive
If the last chiral carbon configuration is changed then it is converted from dextro to laevo.
By changing the configuration at `C_(3) " or " C_(4)` carbon, it is converted into MESO COMPOUND.
Its all diastereomers have ZERO optical rotation.

Answer :C
Discussion
5489.

What is PH at which an acid indicator with K_a = 1xx 10^(-5) changes colour when the indicator concentration is 1xx 10^(-3) M ?

Answer»

4
5
6
3

Answer :B
Discussion
5490.

Which of the following curves is in according with Freundlich adsorption isotherm ?

Answer»

<P>


Solution :`(x)/(m)=k.p^((1)/(n))`
`THEREFORE log_(10).(x)/(m)=log_(10)k+(1)/(n)log_(10)p`
`Y=C+mx`
`Slope =(1)/(n)" INTERCEPT "=log_(10)k`
Discussion
5491.

What are anomers ? Give the structures of two anomers of glucose.

Answer»

Solution :MONOSACCHARIDES which DIFFERS in CONFIGURATION at FUNCTIONAL gp-C-atom (`C_(1) "and"C_(2)`), e.g., `alpha`-glucose and `beta-glucose`.
Discussion
5492.

Write the formula of the following complexes: Potassium pentachloromonoammine platinate (IV).

Answer»

SOLUTION :`K[PT(NH_3)CI_5]`
Discussion
5493.

Which of the following oxygen compound is not called oxide ?

Answer»

`OF_2`
`Cl_2O_7`
`ClO_2`
`BrO_2`

SOLUTION :`OF_2` is OXYGEN DIFLUORIDE because FLUORINE is more ELECTRONEGATIVE than oxygen.
Discussion
5494.

Why actinides are more reactive than lanthanides?

Answer»

SOLUTION :All actinides have `7s^(2)` outer electronic CONFIGURATION. These s-electrons are less firmly held and are easily AVAILABLE for bonding. HENCE actinides are more reactive.
The 6s-electrons of lanthanides are more firmly held and hence they are less reactive.
Discussion
5495.

Which of the following has the highest magnetic moment?

Answer»

CR
`Mn^(2+ )`
`FE^(2+ )`
`Cu^(+ )`

ANSWER :A
Discussion
5496.

Which of the following statements is incorrect about enzyme catalysis?

Answer»

ENZYMES are MOSTLY proteinous in nature
Enzyme action mostly proteinous in nature
Enzymes are denatured by ulteaviolet RAYS and at hight temperature
Enzymes are LEAST reactive at optimum temperature.

Solution :Enzymes are least reactive at optimum temperature
Discussion
5497.

Which one of the following is a permanent gas?

Answer»

`NH_3`
`SO_3`
`N_2`
`CO_2`

SOLUTION :`N_2`
Discussion
5498.

Which sulphide is insoluble in yellow ammonium sulphide ?

Answer»

SNS
`As_2S_3`
`Sb_2S_3`
`Bi_2S_3`

ANSWER :D
Discussion
5499.

Which of these reactions can be used for the preparation of prinmary amines?

Answer»

CURTIUS REARRANGEMENT
Gabriel SYNTHESIS
SCHMIDT rearrangement
All of the above

Answer :D
Discussion
5500.

The solubility of AgCl(s) with solubility product 1.6 times 10^-10 in 0.1 M NaCl solution would be …………

Answer»

`1.26 times 10^-5 M`
`1.6 times 10^-9M`
`1.6 times 10^-11 M`
Zero

Solution :`AGCL(s)=Ag^+(aq)+CL^(-) (aq)`
`NaCl to Na^++Cl^-`
`K_(sp)=1.6 times 10^-10`
`K_(sp)=[Ag^+][Cl^-]`
`K_(sp)=(s) (s+0.1)1`
`0.1 gt gt gt s`
`THEREFORE s+0.1 approx 0.1`
`therefore s=(1.6 times 10^-10)/0.1=1.6 times 10^-9`
Discussion