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23001.

Which of the following statement is not correct when a mixture of NaCl and K_2Cr_2O_7 is warmed with conc. H_2SO_4 ?

Answer»

Deep red VAPOURS are EVOLVED
Chlorine gas is evolved
The vapourswhen PASSED through NaOH solution gives a yellowsolution of `Na_2CrO_4`.
Chromyl chloride is FORMED.

Answer :B
Discussion
23002.

Which of the following IUPAC names is not correctly matched?

Answer»


`(CH_(3))_(2)C=CHCOOH` : 3-Methylbut-2-enoic ACID
`PhCH_(2)CH_(2)COOH`: 3-Phenylpropanoic acid

Solution :is 2-methylclopentanecarboxylic acid.
Discussion
23003.

Whichof the followingcompoundis responsiblefor depletionof ozonelayer ?

Answer»

Freon
Chloroform
D.D.T.
Iodoform

Answer :A
Discussion
23004.

Which of the following sets of quantum number is correct for an electron in 4f orbital?

Answer»

n=4,L =3,m =4,s = `+ 1//2`
n=4,l=4,m=0,s = `-1//2`
n=4,l=2,m=-2,s `+1//2`
n=4,l=3,m=-2,s=`-1//2`

ANSWER :D
Discussion
23005.

What is saponification? Write the equation to get sodium stearate by this method.

Answer»

SOLUTION :When oil or fat is heated with aqueous NAOH, sodium SALTS of fatty ACIDS (soaps) are FORMED.
Discussion
23006.

Which reagent can be used to separate CH_3COCH_3 from C Cl_4 in a mixture:

Answer»

`NaHSO_3`
NaCl
NaOH
None

Answer :A
Discussion
23007.

Which of the following complexes exhibit chirality ?

Answer»

`[Cr("ox")_(3)]^(3-)`
`CIS-[PtCl_(2)(en)]`
`cis-[RhCl_(2)(NH_(3))_(4)]^(+)`
`MER-[Co(NO_(2))_(3)(dien)]`

Solution :`[M(A A)_(3)]` is chirla `implies` LACKS POS and COS
Discussion
23008.

Two substances when separated out on the basis of their extent of adsorption by one material ,the phenomenon is :

Answer»

COLUMN chromatorgraphy
PAPER CHROMATOGRAPHY
SUBLIMATION
STEAM distillation

Answer :A
Discussion
23009.

Which of the following is not the product of dehydration of

Answer»




SOLUTION :
Discussion
23010.

Which element among the following does NOT form diatomic molecules?

Answer»

Argon <BR>Oxygen
Nitrogen
Bromine

SOLUTION :Argon is monoatomic. While OTHERS are oxygen `(O_(2))`, Nitrogen `(N_(2))` and Bromine `(Br_(2))` diatomic.
Discussion
23011.

Which of the following can exist as geometric isomers ?

Answer»

`ClCH_(2)C-=C CH_(3)`<BR>`ClCH_(2)-CH=CH-CH_(2)Cl`
`CH_(2)=CHCHO`
`CH_(2)=underset(CH_(3))underset("|")"C "-CH_(2)CH_(3)`

Solution :Ethylene dibromide (Br has larger size than `CH_(3)-` group).
Discussion
23012.

Which of the following is /are polymer of formadehyde ?

Answer»

BAKELITE
UROTROPINE
Paraaldehyde
Phorone

Solution :N//A
Discussion
23013.

What happens when bromoethane is heated with alcoholic potash ? Give equations.

Answer»

Solution :Bromoethane or heating with ALCOHOLIC KOH gives ethene as a MAJOR PRODUCT.
`underset("Ethyl bromide")(C_(2)H_(5)-Br) underset(Delta)overset(Alc.KOH)to H-overset(H)overset(|)(C)=overset(H)overset(|)(C)+KBr+H_(2)O`)
Discussion
23014.

Which of the following resembles dioxygen in its magnetic property

Answer»

`S_(8) `
`S_(6)`
`S_(4)`
`S_(2)`

ANSWER :D
Discussion
23015.

Which of the following sets of ions represents the collection of isoelectronic species?

Answer»

`K^(+),Cl^(-),Mg^(2+),Sc^(3+)`
`Na^(+),Ca^(2+),SC^(3+),F^(-)`
`K^(+),Ca^(2+),Sc^(3+),Cl^(-)`
`Na^(+), Mg^(2+),AL^(3+), Cl^(-)`

Solution :Iso- electronic SPECIES are those which have same NUMBER of electrons `K^(+), Ca^(2+), Sc^(3+)` and `Cl^(-)` have 18 electrons each.
Discussion
23016.

Which of the following is calcium super phosphate ?

Answer»

`CA(H_(2)PO_(4))_(2)H_(2)O+2CaSO_(4)2H_(2)O`
`Ca(PO_4)_2+2CaSO_4`
`CaSO_(4)+CaO`
`Ca(H_(2)PO_(4))_(2)H_(2)O+CaSO_(4)`

Answer :A
Discussion
23017.

Which of the following statements is not correct about the characteristics of cathode rays?

Answer»

They start from the cathode and MOVE TOWARDS the anode.
They travel in straight LINE in the ABSENCE of an external electricla or magnetic field.
Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube.
Characteristics of cahode rays depend upon the NATURE of gas present in the cathode ray tube.

Answer :D
Discussion
23018.

Which of the following statements is not applicable to white phosphorus ?

Answer»

It is HIGHLY reactive
It is soluble in non-polar solvent.
It is non-poisonous
It is STORED in water.

ANSWER :C
Discussion
23019.

when two half-cells of electrode potential of E_1 and E_2 are combined to form a half cell of electrode potential E_3 , then (when n_1,n_2 " and " n_3 are no. of electrons exchanged in first second and combined half-cells:

Answer»

`E_3^@=E_1^@+E_2^@`
`E_3^@=E_2^@-E_1^@`
`E_3^@=(n_1E_1^@+n_2E_2^@)/n_3`
`E_3^@=(n_1E_1^@+n_2E_2^@)/(n_3^2)`

ANSWER :C
Discussion
23020.

Which is the correct statement in case of milk?

Answer»

Mikis an EMULSION of FAT in water
Milk is an emulsion of PROTEIN in water
Mik s slabied by protein
Milk is STABILIZED by fat.

ANSWER :A
Discussion
23021.

Which is the last element of the series of the actinoids ? Write the electronic configuration of this elements. Comment on the possible oxidation state of this element.

Answer»

SOLUTION :Last actinoid = Lawrencium (Z = 103)
Electronic configuration = `[RN]_(86) 5f^(14) 6^(1)7S^(2)`
POSSIBLE oxidation state = +3
Discussion
23022.

Which reagent does not give oxygen as one of the product during oxidation with ozone?

Answer»

`SO_(2)`
`SnCl_(2)//HCl`
`H_(2)S`
PBS

Solution :`2SO_(2)+O_(3) to 2SO_(3), 3SnCl_(2)+6HCl+O_(3) to 3SnCl_(4)+3H_(2)O`
Discussion
23023.

Which of the following has acidic hydrogen

Answer»

Ethyne
Ethene
Ethane
Benzene

Solution :`2CH-=CH+2Na to 2CH -= C^(-) Na^(+) + H_2`
REACTION with SODIUM metal SHOWS that HYDROGEN is ACIDIC
Discussion
23024.

Write the IUPAC name of the major product obtained when 2-Bromopentane reacts with alcoholic KOH. Give equation. Name the reaction.

Answer»

Solution :* Pent-2-ene
* `{:(CH_(3)-CH_(2)-CH_(2)-CH-CH_(2)overset(OH^(-))rarrCH_(3)-CH_(2)-CH=CH-CH_(3)),("|"),(""Br):}`
* Elimination reaction.
Discussion
23025.

What is the basic difference between adsorption and absorption.

Answer»

Solution :In ADSORPTION, the substance is concentrated only at the SURFACE and does not penetrate through the surface to the bulk of the ADSORBENT, while in absorption, the subtance is uniformly DISTRIBUTED through out the bulk of the solid.
Discussion
23026.

Which of the following compounds // complex ions would not show geometrical isomerism?

Answer»

`[Co(en)(SCN)_(4)]^(-)`
`[Pt(en)_(2)CLBR]^(2+)`
`[Cr("gly")_(3)]`
`[Pt("gly")_(2)Cl_(2)]`

SOLUTION :exist in only one form
Discussion
23027.

Which one amont the following is the most appropriate statement with respect to the atomic weight of an element ?

Answer»

The ATOMIC weight of an element is the sum total of the NUMBER of protons and NEUTRONS present in the atom of the element
Unlike mass number, the atomic weight of an element can be a fraction
The atomic weight of an element is a WHOLE number
The atomic weight of all the ATOMS in an element is the same

Solution :The atomic weight of an element can be in fraction.
Discussion
23028.

Which of the following statements about benzyl chloride is incorrect?

Answer»

 it is LESS reactive than ALKYL halides
it can be oxidised to benzaldehyde by boiling with copper nitrate solution
 it is a lachrymatory liquid and ANSWERS Beilstein's test
it gives a white PRECIPITATE with alcoholic silver nitrate.

Answer :A
Discussion
23029.

Transition metals are less reactive than s-block metalsbecause of their :

Answer»

HIGH ionisation potential and LOW MELTING POINT
High ionisation potential and high melting point
Low ionisation potential and low melting point
Low ionisation potential and high melting point

Answer :B
Discussion
23030.

Discuss the reactions of aliphatic aldehydes and ketones with Hychoxyl amine

Answer»

HYDROGEN bonding
Van DER WALL's forces
Dipole-dipole attraction
None

Answer :C
Discussion
23031.

When two reactants, A and B are mixed to given products C and D, the ractin quotient Q, at the initial stages of the reaction

Answer»

Is ZERO
DECREASES with time
Is independent of time
Increases with time

SOLUTION :At INITIAL stage of reactin, concentration of each product will INCREASE and hence Q will increase.
Discussion
23032.

Which of the following alkenes does not exhibit geometrical isomerism-

Answer»

`FCIC=CHD`
`FCIC=C""CIF`
`CH_3CH_2overset(CH_3)OVERSET(|)C=overset(CH_3)overset(|)C""CH_2CH_3`
`(CH_3)_2C=overset(CH_3)overset(|)C""CH_2CH_3`

ANSWER :D
Discussion
23033.

Which of the following will undergo periodic oxidation?

Answer»

a.
b.
c.
d.Glyoxal

Solution :a. Two (-OH) GROUPS are at adjacent and SYN (CIS) positions. So it undergoes periodic OXIDATION.
b. Although two (-OH) group are at adjacent POSITION but in anti (trans) position, so it does not undergo periodic oxidation.
Two

group are in adjacent position, so it undergoes periodic oxidation.
d. Glyxal `(underset(CH=O)overset(CH=O)|)`, two `(-CHO)`groups are in adjacent position so it undersgoes periodic oxidation. So the answer are `(a), (c )` and `(d)`.
Discussion
23034.

When hydrated MgCl_2.6H_2O is strongly heated:

Answer»

MGO is formed
`MG(OH)_2` is formed
Mg(OH)CL is formed
Anhydrous `MgCl_2` is formed

Answer :A
Discussion
23035.

Which is order of heat of hydrogenation for the following set of molecules :-

Answer»


Answer :`(1) II gt I(2) III gt II gt IV gt I (3) II gt III gt I`
Discussion
23036.

When conc. H_2SO_4 was added into an unknown salt present in a test tube, a brown gas (A) was evolved. This gas intensified when copper turnings were also added into this test tube. On cooling, the gas (A) changed into a colourless gas (B). (a) Identify the gases (A) and (B). (b) Write the equations for the reactions involved.

Answer»

Solution :(a) GAS (A) - `NO_2 ` ( BROWN gas )
Gas (B) - `N_2O_4` ( colourless gas ).
(b) `MNO_3 + H_2SO_4 to MHSO_4 + HNO_4`
`Cu + HNO_3 to Cu(NO_3)_2 + 2H_2O + underset("Brown gas ")(2NO_2)`
`underset((A))(2NO_2) OVERSET(" On COOLING ")to underset("(B) colourless ")(N_2O_4)`
Discussion
23037.

The type of isomerism present in [Pt(NH_(3))_(4)][Pd(Cl)_(4)] and [Pd(NH_(3))_(4)][Pt(Cl)_(4)] is ………………

Answer»

SOLVATE isomerism
Ionisation isomerism
Coordination isomerism
Linkage isomerism

Answer :A::C::D
Discussion
23038.

Which one of the following processes does not involve adsorption-

Answer»

HETEROGENEOUS catalysis
homogeneous catalysis
froth-floatation
gas mask

Answer :C
Discussion
23039.

What is the cell potential of mercury cell ? What are its applications ?

Answer»

Solution :CELL potential of MERCURY cell is approximately 1.35 V. It is used in hearing AIDS and watches.
Discussion
23040.

When electron in hydrogen atom jumps to the inner most orbit, the radiation emitted belongs to , which one of the following series?

Answer»

BRACKETT series
Paschen series
Balmer series
Lyman series

Answer :C
Discussion
23041.

Total stereoisomers of [Co(N_(2)O_(4))]^(-) are :

Answer»


Solution :`N_(2)O_(4)` is a HEXADENTATE LIGAND.
Discussion
23042.

What is the elementary reactions?

Answer»

SOLUTION :The REACTION taking place in a single step is an ELEMENTARY reaction. For EXAMPLE. `N_(2)(g) +O_(2)(g) to 2NO(g)`
Discussion
23043.

Two 5 molal solutions are prepared by dissolving a non-electroylete, non -volatile solute separately in the solvents X and Y. The molecular weights of the solvents are M_(x) and M_(Y), respectively where M_(X)=4/3M_(Y). The relative lowering of vapour pressure of the solution in X is "m" times that of the solution in Y. Given that the number of moles of solute is very small in comparision to that of solvent, the value of "m" is :

Answer»

<P>`3/4`
`4/3`
`1/2`
`1/4`

Solution :Molality=`("Number of MOLES of SOLUTE")/("Mass of solvent (in kg)")`
Number of moles of `=5xx1=5` (in both in solvents)
Number of moles of solvent `x=1000/(M_(x))`
Number of moles of solvent `Y=1000/(M_(Y))`
Relative lowering in vapour pressure is GIVEN as `(p^(@)-p_(s))/(p_(s))=(n_(2))/(n_(1))`
`((p^(@)-p_(s))/(p_(s)))_("solution in X")=5/(1000/M)=(5M_(x))/1000`
`((p^(@)-p_(s))/(p_(s)))_("solution in Y")=5/(1000/(M_(Y)))=(5M_(x))/1000`
According to question `1/mxx(5M)/1000=(5M_(Y))/1000`
`1/mxx5xx3/4M_(Y)=M_(Y)` (Given `M_(x)=3/4M_(Y)"":.m=3/4`
Discussion
23044.

When primary amine is heated with CS_(2) in the presence of excess of mercuric chloride, it gives isothiocyanate. This reaction is called :

Answer»

HOFFMANN bromamide reaction
Hoffmann MUSTARD OIL reaction
Perkin's reaction
Hoffmann ELIMINATION reaction.

Answer :B
Discussion
23045.

Which compound is not an associated liquid:

Answer»

`C_6H_5OH`
`CH_3NH_2`
`CH_3Cl`
`CH_3OH`

ANSWER :C
Discussion
23046.

Whichof the following react with NaOH produces acid and alcohol ?

Answer»

`C_(6)H_(5)CHO`
`CH_(3) - CHO`
`CH_(3)COOH`
`C_(6)H_(5)COOH`

Answer :A
Discussion
23047.

Which substance will conduct the current in the solid state

Answer»

DIAMOND
GRAPHITE
IODINE
sodium CHLORIDE

Answer :B
Discussion
23048.

Which one of the following statements is true for a solution ?

Answer»

Molarity is ALWAYS EQUAL to molality
Molarity is always less than molality
Molarity is always greater than molality
NONE of these

Solution :none of these. There is no relation between molarity and molality as such .
Discussion
23049.

Which of the given method produce Cl_(2)

Answer»

Electrolysis of brine
Deacons process
Heating `MnO_(2)` with CON HCl
Heating KCl with Con `H_(2)SO_(4)`

SOLUTION :(a) Electrolysis of Brine `-Cl_(2)` liberated at anode.
`2Cl^(-) rarr Cl_(2) + 2e^(-)` ( at anode) , `2H^(+) + 2e^(-) rarr H_(2)` ( at cathode)
(b) Deacon process `: 4HCL + O_(2) underset( 450^(@)C)overset( CaCl_(2))(rarr) 2Cl_(2) + 2H_(2)O`
(c ) `MnO_(2) + 4HCl ("conc.")rarr MnCl_(2) + Cl_(2) + 2H_(2)O`
Discussion
23050.

What type of forces are involved in binding of substrate to the active site of enzyme ?

Answer»

Solution :Drugs the catalytic action of an enzyme hold the SUBSTRATE for a chemical reaction. Active sites of enzymes holds the substrate molecules in a suitable positions, so than it can be attacked by the REAGENTS EFFECTIVELY.
Substrate BIND to the active SITE of the enzymes through a variety of interactions. These forces are van der Waal's interactions, ionic bonding, hydrogen bonding or dipole-dipole interaction.
Discussion