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11501.

Which of the following metals has the largest abundance in the earth's crust ?

Answer»

Aluminium
Calcium
Magnesium
Sodium

Answer :A
Discussion
11502.

Which of the following element is nonmetal

Answer»

GALLIUM
INDIUM
THALIUM
BORON

ANSWER :D
Discussion
11503.

Which of the following is not a use of dioxygen gas ?

Answer»

USEFUL in PREPARATION of STEEL
Useful in respiration and combustion reaction
Useful as bleaching agent for bleaching of different oils
Useful in WELDING WORK of metals

Answer :C
Discussion
11504.

There are some coordination compounds given in column-I which may exist in different isomeric forms as given in column-II.Select the option for the coordination compounds and their respective isomeric forms. {:("Column-I","Column-II"),((A)[Co(en)_2NH_3Cl]SO_4,(p)"Optical isomer"),((B)[Co(NH_3)_4(NO_2)_2](NO_3),(q)"Geometrical isomer"),((C)[Co(en)(pn)(NO_2)_2]Cl,(r)"Ionization isomer"),((D )[Co(gly)_3], (s)"Linkage isomer"),(" " , (t)"Hydrate isomer"):}

Answer»


Solution :(A)`overset(III)([Co(en)_2(NH_3)Cl]^(2+))SO_4^(2-)` and `overset(III)([Co(en)_2(NH_3)SO_4]^(+)Cl^(-)` ionisation isomerism.

Note: TRANS-form has a centre of symmetry and several planes of symmetry, but the cis-form has neither.
(B)Has total 10-isomeric forms including linkage (`NO_2`- ambidentate ligand), ionisation (exchange of `NO_2^-` and `NO_3^-` ), geometrical isomers (cis- and trans-)
Compound is optically inactive as cis-as well as trans-forms possess at least one PLANE of symmetry Linkage through either O- and N- give RISE to linkage isomerism.


Thus EXISTS in two trans-and two cis-isomers and each of cis-isomers show optical isomerism.

Both cis- and trans- isomers have each a pair of optical isomers because the absence of any one of symmetry ELEMENTS.
Discussion
11505.

The recommended daily dose is 17.6 milligrams of vitamin C (ascorbic acid) having formula C_(6)H_(8)O_(6) Match the following . Given : N_(A)=6xx 10^(23)

Answer»


ANSWER :AR, BQ, CP
Discussion
11506.

Which compounds would undergo Cannizaro'sreaction?

Answer»

`underset(CH_(3))underset("|")overset(CH_(3))overset("| ")(CH_(3)-C-CHO)`
`CH_(3)CH_(2)CH_(2)CH_(2)CHO`
`CH_(3)CH_(2)-underset(CH_(3))underset("|")(CH)-CHO`
`CH_(3)-underset(CH_(3)"")underset("|")(CHCH_(2)CHO)`

Answer :A
Discussion
11507.

What are monohydric alcohols ? How are they classified ?

Answer»

Solution :Alcohols having only one hydroxyl group in their MOLECULES are called monohydric alcohols. Monohydric alcohols are classified according to the type of hybridization of th carbon atom to which the hydroxyl group is attached .
(1) Alcohols containing`C_(sp^(3))-OH` bond : In these alcohols -OH group is attached to a `sp^(3)`hybridised carbon atom of alkyl group. These alcohols are represented as R-OH . They are further classified as primary , SECONDARY and tertiary alcohols in which -OH group is attached to primary , secondary , and tertiary carbon atoms respectively.

(a) Allylic alcohols : In these alcohols -OH is attached to a `sp^(3)`-hybridised carbon atom next to the carbon-carbon double bond i.e., to allylic caron. Allylic alcohol may be primary , secondary and tertiary alcohols.`{:(CH_(2)=CH-CH_(2)-OH""CH_(2)=CH-overset(CH_(3))overset(|)(CH)-OH""CH_(2)=CH-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-OH),("Allyl alcohol (primary)(secondary alcohol )(teritary alcohol)"),("prop-2-en-1-olbut-3-en-2-ol2-methylbut-3-en-2-ol") :}`
(b) Benzylic alcohols : In these alcohols -OH group is attached to a `sp^(3)` -hybridised carbon atom next to an aromatic ring. Benzylic alcohol may be primary , secondary and tertiary alcohols.

(2) Alcohols containing `C_(sp)^(2)-OH` bond : In these alcohols -OH group is ttached to a `sp^(2)` hybridised carbon atom , e.g., vinylic carbon. These alcohols are ALSO called vinylic alcohols.
Discussion
11508.

Which of the natural process is spontaneous

Answer»

Formation of curd from milk after doing initation
`"CONVERSION of C (graphite)" rarr "C(DIAMOND) at" 25^(@)C` and latex.
Formation of `H_(2)(g)` and `O_(2)`(g)` from H_(2)O(l)`
Formation of `CrO_(5)` from `H_(2)O_(2)` and `K_(2)Cr_(2)O_(7)` in basic medium

Solution :N//A
Discussion
11509.

X_(m)Y_(n(s)) underset(H_2O)(hArr) mX_((aq))^(n+)+nY_((aq))^(m-) solubility product K_(sp) is

Answer»

`[X^(N+)]^m[Y^(m-)]^n`
`[X^(n+)][Y^(m-)]`
`[X^(n+)]^m//[Y^(m-)]^n`
`[X^(n+)]//[Y^(m-)]`

ANSWER :A
Discussion
11510.

Which one of the following high spin complexes has the largest crystal field stabilization energ?

Answer»

`[Cr(H_2O)_6]^(2+)`
`[Cr(H_2O)_6]^(3+)`
`[Mn(H_2O)_6]^(2+)`
`[Mn(H_2O)_6]^(3+)`

Answer :B
Discussion
11511.

Which of the following polymers is not correctly matched ?

Answer»

Formation of dacron-Step growth polmerisation
Formation of polytetrafluoroethene-step growth polymerisation
Formation of polythene-CHAIN growth polymerisation in presence of BENZOYL PEROXIDE
Formation of polyacylonitrile - Chain growth polymerisation in presence of peroxide

Solution :Polytetrafluroethene ( TEFLON ) is a chain growth polymerformed by polymerisation of tetrafluoroethenein presence of persulphate catalyst.
Discussion
11512.

When methyl iodide is treated with ammonia, the product obtained is :

Answer»

Methylamine
Dimethylamine
TRIMETHYLAMINE
All

ANSWER :D
Discussion
11513.

What is the magnetic nature of manganate and permanganate ions.

Answer»

Solution :Mananate ion is PARAMAGNETIC in nature with ONE unpaired ELECTRON and permanganate is DIAMAGNETIC in nature.
Discussion
11514.

Van Arkel method of purification of metals involves converting the metal to a:

Answer»

volatile STABLE COMPOUND.
non-volatile stable compound.
volatile UNSTABLE compound.
none of these

Answer :A
Discussion
11515.

The shape of methyl carbanion is similar to that of -

Answer»

`BF_(3)`
`NH_(3)`
METHYL free radical
methyl carbocation

Solution :Methyl carbanion is `sp^(3)`hybridised , with three bond pairs and one LONE pair , same is the case with `NH_(3)`.
Discussion
11516.

What is the E_(cell) Value of galvanic cell of redox reactions at equilibrium condition ?

Answer»

More than ZERO volt
Less than zero volt
Zero volt
None of above

Solution :`E_(cell)^(Theta)=E_(cell)^(Theta)-(0.059)/(n)log KAPPA`
But when EQUILIBRIUM achieved than cell stops WORKING and so `E_(cell)=0.0V`.
Discussion
11517.

What are analgesic medicines? How are they clasified and when are they commonly recommended for use?

Answer»

Solution :Analgesic medicines : The Chemicalsubstancewhich are used to RELIEVE pain is CALLED analgesic medicines.
There are two TYPES ofanalgesic medicines
(i) Non nacrotic drugs :These are effective in relieving skeletal pain, preventing heart attack and viral inflammation etc.
(II) Nacrotic drugs :These are recommended for the RELIEF in postoperative pain, cardiac pain and terminal cancer.
Discussion
11518.

The reagents for the following conversion is/are

Answer»

alcoholic KOH
alcoholic (2OH) followed by `NaNH_(2)`
AQUEOUS KOH followed by `NaNH_(2)`
`Zn//CH_(3)COOH`

ANSWER :B
Discussion
11519.

The value of DeltaG ((KJmol^(-1)) for the given cell is : ( Taken 1F = 96500C mol^(-1)

Answer»

`(-5.7)`
`(5.7)`
`(11.4)`
`(-11.4)`

SOLUTION :`DeltaG=-nFE=-2xx96500xx0.059=-11.4 kJ//m OL `
Discussion
11520.

Two pure liquids A & B which can from ideal solution have vapour pressures 300 torr & 800 torr . A mixture of the vapour of A & B for which the mole fraction of A is 0.25 is slowly compressed at temperature T. The total pressure when first drop of condensate formed will be

Answer»

565 torr
465 torr
365 torr
665 torr

Answer :A
Discussion
11521.

The solubility ofa sparingly solute salt A_(2)B_(2) is 3.5xx10^(-8) at 30^(@)C and the vapour pressure of its saturated solution in water is 31.8 mm of Hg at 40^(@)C. Calculate the enthalpy change for the reaction. A_(2)B_(3)hArr 2A^(+3)+3B^(-2) Vapour pressure of pure water =31.9 mm Hg at 40^(@)C

Answer»


ANSWER :`401.13` kJ/mole
Discussion
11522.

Which of the following have the maximum boiling point ?

Answer»


`CH_(3)-CH_(2)CH_(2)CH_(2)CL`
`CH_(3)-underset(CH_(3))underset("|")("C ")HCH_(2)Cl`
`CH_(3)-OVERSET(CH_(3))overset("|")underset(CH_(3))underset("|")("C ")-Cl`

Answer :A
Discussion
11523.

The standard oxidation potentials of Zn, Cu, Ag and Ni electrodes are +0.76,-0.34,-0.80 and +0.25 V respectively . Which of the following reaction will provide maximum voltage ?

Answer»

`CU+2Ag^(+)(aq)toCu^(2+)(aq)+2Ag`
`Zn+2AG^(+)(aq)toZn^(2+)(aq)+2Ag`
`H_(2)+NI^(2+)(aq)to2H^(+)(aq)+Ni`
`Zn+Cu^(2+)(aq)toZn^(2+)(aq)+Cu`

Solution :For (a) `E^(@)=-0.34+0.80=0.46V`
(b)`E^(@)=0.76+0.80=1.56V`
(C ) `E^(@)=-0.25V`
(d)`E^(@)=0.76+.34=1.00V`
(e )`E^(@)=0.76V`
`therefore` Correct ANSWER (B) .
Discussion
11524.

The substance having highest conductivity at room temperature among the following is

Answer»

0.1 N HCl
0.1 N NaCl
GRAPHITE
glass.

Solution :Graphite has FREE delocalized electrons which can MOVE FASTER.
Discussion
11525.

The temperature dependence of the e.m.f. of a standard electrochemical cell is given by E=1.02-4.0xx10^(-5)(T-20)-9.0xx10^(-7)(T-20)^(2) where T is in .^(C) and E is in volts. Calculate the temperate coefficiency of the e.m.f. at 30^(@)C

Answer»

SOLUTION :`(DE)/(DT)=(d)/(dT)[1.02-4.0xx10^(-5)(T-20)-8.0xx10^(-7)(T-20)^(2)]`
`=-0.4xx10^(-5)-9.0xx10^(-7)xx2(T-20)`
`=-4.0xx10^(-5)-9.0xx10^(-7)xx2(30-20)`
`=-4.0xx10^(-5)-9.0xx10^(-7)xx20`
`=-4.0xx10^(-5)-1.80xx10^(-5)=-5.8xx10^(-5)V//.^(@)C`
Discussion
11526.

Which of the following exists as an optical isomer ?

Answer»

`[Zn(EN)(NH_(3))_(2)]^(3+)`
`[Co(en)_(3)]^(2+)`
`[Co(H_(2)O)_(4)(en)]^(2+)`
`[Zn(en)_(2)]^(2+)`

Solution :b) it is the correct answer
Discussion
11527.

Which of the following bond is strongest ?

Answer»

`C -C`
`C-H`
`C-O`
NONE

ANSWER :B
Discussion
11528.

Which of the following oxides is/are amphoteric ?

Answer»

`Na_(2)O`
`CaO`
`Al_(2)O_(3)`
`SnO_(2)`

ANSWER :C::D
Discussion
11529.

Which of the following is an interstitial compound

Answer»

`NH_3`
`PdCl_2`
`TIH`
`ZNO`

ANSWER :C
Discussion
11530.

Which chemical is used as wood spirit ?

Answer»

SOLUTION :METHANOL
Discussion
11531.

The relationship between the value of Osmotic pressue (pi) of the solution obtained by dissolving 6 g.L^(-1)of acetic acid (pi_1) and7.45 g.L^(-1) of KCl (pi_2) is

Answer»

`pi_1 LT pi_2`
`pi_1 GT pi_2`
`pi_1=pi_2`
`pi_1/(pi_1+pi_2)=pi_2/(pi_1+pi_2)`

ANSWER :A
Discussion
11532.

The reagent which can be used to distinguish acetophenone from benzophenone is :

Answer»

2,4-dinitrophenyl HYDRAZINE
Aqueous `NaHSO_3`
Benedict's SOLUTION
`I_2` and `NAOH`

ANSWER :D
Discussion
11533.

Which of the following is most effective for the hydrolysis of an ester?

Answer»

DILUTE ALKALI
Dilute ACID
Water
Acid or alkal

Answer :A
Discussion
11534.

What is stoichiometric coefficient of Ca in the following reaction? Ca + Al^(3+) toCa^(2+) + Al

Answer»

`1`
`1.5`
`2`
`3`

ANSWER :D
Discussion
11535.

Which of the following contains most basic nitrogen

Answer»




SOLUTION :RESONENCE `UARR` b.c `DARR`
Discussion
11536.

Which is used as a general anaesthetic in place of diethyl ether:

Answer»

`CF_3-CHClBr`
`CF_3-CHCl_2`
`CF_3-CHBr2`
None

Answer :A
Discussion
11537.

underset([Co(en)_(2)ClBr]NO_(2))(X) to "Isomer" A overset(AgNO_(3))to "Yellow ppt" B overset(AgNO_(3)) to "White ppt" C to exhibit facial meridonial Compound A many show

Answer»

IONISATION ISOMERISM
LINKAGE isomerism
OPTICAL isomerism
All of these

ANSWER :D
Discussion
11538.

underset([Co(en)_(2)ClBr]NO_(2))(X) to "Isomer" A overset(AgNO_(3))to "Yellow ppt" B overset(AgNO_(3)) to "White ppt" C to exhibit facial meridonial How many total structure are possible for compound C ?

Answer»

2
4
1
3

Answer :B
Discussion
11539.

Write the structure formula and IUPAC name of. (i) Iso - butyl chloride (ii) Tert - amyl bromide (iii) Sec-butyl chloride

Answer»

SOLUTION :(i) `OVERSET(3)(CH_(3))-UNDERSET(CH_(3))underset(|)overset(2)(CH)-overset(1)(CH_(2))-Cl`
(1-Chloro-2-methyl propane)
(II) `CH_(3)-underset(""^(3)CH_(2)^(4)CH_(3))underset(|)overset(""^(1)CH_(3))underset(|)(CH_(3))-Br`
(2-Bromo-2-methyl butane)
(iii) `underset("2-Chlorobutane")(overset(1)(CH_(3))-underset(Cl)underset(|)overset(2)(CH)-overset(3)(CH_(2))-overset(4)(CH_(3)))`
Discussion
11540.

Which of the following is not condensation method for preparation of colloid sol ?

Answer»

Peptization
Solvent Exchange METHOD 
EXCESSIVE COOLING 
DOUBLE decomposition 

ANSWER :A
Discussion
11541.

VitaminB _(2)is alsoknown as

Answer»

Riboflavin
Thiamine
NICOTINAMIDE
PYRIDOXINE

ANSWER :A
Discussion
11542.

Which of the following options are correct for [Fe(CN)_(6)]^(3-) complex ?

Answer»

`d^(2)SP^(3)` HYBRIDISATION
`sp^(3)d^(2)`hybridisation
paramagnetic
diamagnetiic

Answer :A::C
Discussion
11543.

Which of the following graph represents melting points of the group - 15 elements is

Answer»




ANSWER :3
Discussion
11544.

Which of the following is weakest acid

Answer»



`H-COOH`

ANSWER :A
Discussion
11545.

When a mixture of solid NaCl, solid K_(2)Cr_(2)O_(7) is heated with conc. H_(2)SO_(4) orange red vapours are obtained. These are of the compound

Answer»

Chromous chloride
Chromyl chloride
Chromic chloride
Chromic sulphate

Solution :`NaCl+H_(2)SO_(4)toNaHSO_(4)+HCl`
`K_(2)Cr_(2)O_(7)+2H_(2)SO_(4)to2KHSO_(4)+2CrO_(3)+H_(2)O`
`CrO_(3)+2HClto underset(("ORANGE red vapour"))(CrO_(2)Cl_(2))`
Discussion
11546.

Which one is called Microcosmic salt?

Answer»

`Na_2HPO_4 . 2H_2O`
(NH_4)_2HPO_4. 2H_2O
`NA(NH_4)HPO_4. 4H_2O`
NONE of these

Answer :C
Discussion
11547.

Which of the following carbanion is most stable ?

Answer»

`H_(3)C-overset(Theta)(CH_(2))`
`H_(2)C=CH-overset(Theta)(CH_(2))`
`H_(3)C-overset(O)overset(||)(C)-overset(Theta)(CH_(2))`
`H_(3)C-overset(NH)overset(||)(C)-overset(Theta)(CH_(2)`

ANSWER :C
Discussion
11548.

Which of the following on reaction with NH_(3) gives urinary antiseptic compound

Answer»

`HCHO`
`CH_(3)CHO`
`C_(6)H_(5)CHO`
`C_(6)H_(5)CH_(2)CHO`

Answer :A
Discussion
11549.

What is optical activity ?Explain.

Answer»

SOLUTION :Some COMPOUNDS have the ability to rotate the plane of plane POLARIZED light. This PHENOMENON is CALLED optical activity.
Discussion
11550.

Which of the following is amphoteric oxide

Answer»

`CO_(2)`
`Al_(2)O_(3)`
`N_(2)O`
NO

Answer :B
Discussion