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9701.

The substancewhose solubility decreases with increase in temperature

Answer»

`Na_2CO_3`
`Na_2SO_4`
`NAOH`
All

ANSWER :D
Discussion
9702.

Which solution contains maximum number of H^(+) ion

Answer»

0.1 M HCl
`0.1 M NH_(4)Cl`
`0.1 M NaHCO_(3)`
`0.1 M CH_(3)COOH`

Solution :The HCl is a strong acid and they LOSE EASILY `H^(+)` in solution.
Discussion
9703.

Which one of the following statements is incorrect regarding sucrose ?

Answer»

It is a DISACCHARIDE of `alpha-D-` glucose and `BETA`-D-fructose 
It is a DEXTROROTATORY sugar 
It is a reducing sugar 
HYDROLYSIS of sucrose yields INVERT sugar 

Answer :C
Discussion
9704.

What was the main purpose of lauching Operation Enduring freedoom?

Answer»

SOLUTION :The main purpose of OPERATION Enduring freedom - 2001 was to punish all those BEHIND 9/11 ATTACK, mainly AI Qaeda and Taliban regima.
Discussion
9705.

What is the effect of temperature on molarity of a solution?

Answer»

SOLUTION :It CHANGES with CHANGE in TEMPERATURE.
Discussion
9706.

What happens when ammonia reacts with insufficient amount of chlorine. Give equation

Answer»

SOLUTION :When `NH_3` REACTS with insufficient amount of `Cl_2` nitrogen and AMMONIUM chlorides are formed.
Discussion
9707.

The strength of an acid depends on its :

Answer»

BASICITY
MOLECULAR weight
Acidity
Degree of DISSOCIATION

ANSWER :D
Discussion
9708.

Which one of the following statements concerning the compounds of Lithium is false?

Answer»

The hydroxide, Carbonate, NITRATE, decompose to GIVE the oxide on heating
It is the most electronegative among alkali
The hydrogen carbonate cannot be isolated as a STABLE solid
It FORMS a PEROXIDE but not superoxide

Answer :D
Discussion
9709.

Which of the following weighs most (i) 50 g of iron (ii) 5 g atoms of nitrogen (iii) 0.1 g atom of silver (iv) 1xx10^(23) atoms of carbon

Answer»

SOLUTION :(i) 50.0 g (ii) 70.0 g (III) 10.8 g (iv) 1.992 g. Hence, 5 g atoms of NITROGEN weigh most
Discussion
9710.

Which vitamin deficiency causes the disease 'scurvy' ?

Answer»

SOLUTION :VITAMIN - C
Discussion
9711.

Which of the following exhibits only +3 oxidation state ?

Answer»

AC
Pa
U
Th

Solution :`Ac( 6d^(1) 7s^(2))` shows only `+3`OXIDATION STATE
Discussion
9712.

What happens when barium azide is heated ?

Answer»

Solution :Barium AZIDE on heating undergoes THERMAL DECOMPOSITION. PURE dinitrogen gas is obtained on heating azide.
`BA(N_(3))_(2)overset("heat")rarrBa+3N_(2)`
Discussion
9713.

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

Answer»

SOLUTION :SHE, WHOSE electrode POTENTIAL is taken as ZERO.
Discussion
9714.

Which one of the following is more reactive towards S_N2 reaction?

Answer»




SOLUTION :`SN^2` reaction is FAVOURABLE when less STABLE. Carbocation formed (ABILITY to form COMPLEX) Conceptual
Discussion
9715.

Which of the following atomic numbers are those of inner transition (f-block) elements ?

Answer»

59
95
102
104

Solution :(a,B,C) These are all CORRECT.
Discussion
9716.

Which of the following reaction does not take place at cathode

Answer»

`Ag^(+)+e^(-)toAg`
`CL^(-)toCl+e^(-)`
`H^(+)+e^(-)toH`
`Cu^(2+)+2E^(-)toCu`

Answer :B
Discussion
9717.

Which of the following are amphoteric ?

Answer»

BEO
`Al_(2)O_(3)`
ZNO
`SO_(2)`

Solution :`SO_(2)` is acidic oxide.
Discussion
9718.

Write the IUPAC name of K_3[Fe(CN)_5NO].

Answer»

POTASSIUM pentacyanonitrosy1-ferrare (II)
potassium pentacyanonitrile(II)
potassium pentacyanonitrosyl-ferrate(III)
NONE of these

Answer :A
Discussion
9719.

Which of the following reagents is useful for separating aniline from a mixture of aniline and nitrobenzene?

Answer»

NAOH(AQ)
`H_2O`
`NaHCO_3(aq)`
HCI(aq)

ANSWER :D
Discussion
9720.

Which of the following nitrogen containing compounds are aromatic according to Huckel rule

Answer»


Solution :FOLLOWS HUCKEL `(4n+2)_(PI e^(-))` SYSTEM
Discussion
9721.

Which element is found in free state

Answer»

IODINE
Sulphur
Phosphorus
Magnesium

Answer :B
Discussion
9722.

Which of the following is arranged in order of increasing stability of the metal complexes ? (Oxidation states are given in parenthesis)

Answer»

`Ag(I)ltPt(II)ltCr(III)ltCo(III)`
`Co(III)ltCr(III)ltPt(II)ltAg(I)`
`CR(III)ltPt(II)ltAg(I)ltCo(III)`
`PT(II)ltCo(III)ltAg(I)ltCr(III)`

Solution :EAN
Discussion
9723.

What is the term that we use when both adsorption and absorption take place ? What is the reverse of adsorption ?

Answer»

Solution :The term SORPTION takes PLACE when both ADSORPTION and absorption occur. The reverse of adsorption is called DESORPTION.
Discussion
9724.

Write the formula for each of the following complexes(1) Sodiumdiaquatetrahydroxocobaltate(II) (ii)Diamminechloroethylenediaminenitroplatinum(IV) chloride (iii) Diaquatetrachlorochromate(III) ion (iv) Tetracyanoaurate(III) ion (V) Sodium pentacyanonitrosylsulphidoferrate (III) (vi) Hexammine cobalt(III) chloride (vii) Bis(cyclopentadienyl)iron (11) (viii) Diamminebis(ethylenediamine)cobalt (III) chloride (ix) Tetraamminedithiocynatochromium(III) chloride (x) Potassium tetràoxomanganate (VII) (xi) Hexaaquairon (II) sulphate (xii) Potassium tetracyanonickelate (III) (xiii) Potassium trioxoalatoaluminate (11) (xiv) Chloronitrodiammineplatinum (III)

Answer»

Solution :`Na_(2)[Co(H_(2)O)_(2)(OH)_(4)]`
(ii)`[Pt(NH_(3))_(2)Cl(en)NO_(2)]Cl_(2)`
(III)`(CrCl_(4)(H_(2)O)_(2)]`
(iv)`[Au(CN)_(4)]`
(v)`Na_(4),[Fe(CN)_(5)(NO)S]`
(vi)`(CO(NH_(3))_(6)]C1_(3)`
(vii)`[Fe(C_(5)H_(5))_(2)]`
(viii)`[CO(NH_(3))_(2)(en)_(2)C1_(3)`
(ix)`[Cr(NH_(3))_(4)(SCN)_(2)]CI`
(x)`K[MnO_(4)]`
(xi)`[Fe(H_(2)O)_(6)]SO_(4)`
(xii)`K_(3)[NI(CN)_(4)]`
(xiii)`K_(3)[Al(C_(2)O_(4)3)]`
(xiv)`[PtCI(NO_(2))(NH_(3))_(2)]`
Discussion
9725.

Which is called stranger gas:

Answer»

Kr
Xe
He
Ne

Answer :B
Discussion
9726.

What of the following vitamin contain nitrogen

Answer»

A
B
C
D

Answer :B
Discussion
9727.

what is meant by stability of a co-ordination compound in solution? State the factors which govern stability of complexes.

Answer»

Solution :The stability of a complex or co-ordination compounds refers to the extent upto which it exists in a solution as co-ordination SPHERE
(i) Charge on the central metal ION: Greater the charges on the central ion. Greater the stability of complex.
NATURE of the metal ion: Group 3 and 6 and inner transition elements form stable complexes when donor atoms of the ligands are N, O and F. The elements after group 6 of the transition metals form stable complex when the donor atoms of stable complex when the donor atoms of the ligands are the heavier members of N, O and F family
(iii) Basic natureof the ligands: Greater the basic strength greater is the stability of the complex
(iv) Presence of chelate rings : Its presence increases the stability of he complex .it is called chelate effect . ITIS maximum for the 5 and 6 MEMBERED rings.
(v) Effect of multidentate cyclic ligand :If the ligands are II multidentate and cyclic without any steric effect the stability of the complex get increasd
Discussion
9728.

Vapour pressures of pure acetone and chloroform at 328K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition. Plot p_("total"),p_("chloroform"), and p_("acetone") as a function of x_("acetone"). the experimental data observed for different compositions of mixture is: Plot this data also on the same graph paper. indicate whether it has positive deviation or negative deviation from the ideal solution.

Answer»

Solution :

Mole FRACTION of `C_(6)H_(5)CH_(3)`
`x_(T)=(1*087)/(1*026+1*087)=0*514`
ACCORDING to Raoult's law,
`P_(B)=x_(B)xxP_(B)^(@)=0*486xx50*71=24*64`MM
`P_(T)=x_(T)xxP_(T)^(@)=0*514xx32*06=16*48` mm
Mole fraction of `C_(6)H_(6)` in vapour PHASE
`=(P_(B))/(P_(B)+P_(T))=(24*65)/(24*65+16*48)=0*599`.
Discussion
9729.

whatis the most commonway ofexpressingtheconcentrationof a solution ?

Answer»

Solution :MOLE FRACTION of components is useful WAY of EXPRESSING CONCENTRATION of components.
Discussion
9730.

Write electronic configuration and two uses of neon.

Answer»

Solution :Electronic configuration of neon is `_(10)Ne 1S^(2)2s^(2)2p^(6)`
USES of neon (Ne) :
(i) Neon is used in the production of neon signs by filling Ne in
glass discharge tubes, since it glows during electric discharge.
(ii) Neon lights are used in mist and fog as Beacon lights by pilots
for AIR navigation, since they have a GREAT penetraitng power.
(iii) Ne is used in warning signals, television sets and spark plugs.
Discussion
9731.

Which of the following statement(s) is (are) incorrect?

Answer»

In Serpeck's process siliaca is removed by heating the bauxite to `1800^(@)C` with COKE in a current of `N_(2)`
In extraction of lead from galena roasting and selfredcution TAKES places in the same furnace but under different conditions of temperatures and supply of air
Then TIN is obtained by the carbon reduction of black tin
none of these

Answer :D
Discussion
9732.

Which of the following is used as acetylating agent?

Answer»

ACETIC anhydride
Acetic acid
Acetyl chloride
Both (A) and (C)

ANSWER :D
Discussion
9733.

Which set of following characteristics for ZnS crystal is correct?

Answer»

Coordination NUMBER (4 : 4), ccp, `Zn^(++)` ion in the alternate tetrahedral voids
Coordination number (6:6), hcp, `Zn^(++)` ion in all tetrahedral voids.
Coordination number (6:4), hcp, `Zn^(++)`ion in all OCTAHEDRAL voids
Coordination number (4 : 4), ccp, `Zn^(++)`ion in all tetrahedral voids.

Solution :ZnS has cubic CLOSE packed (ccp) structure. The `S^(2-)`ions are PRESENT at the corners of the cube and at the centre of each face. Zinc ions occupy half of the tetrahedral sites. Each zinc ion is surrounded by FOUR sulphide ions which are disposed towards the corners of a regular tetrahedron. Similarly, SP-ion is surrounded by four `Zn^(2+)`ions.
Discussion
9734.

The standard reduction potential values of three metallic cations X, Y and Z are 0.52 V, -3.03 V and -1.18 V respectively. The order of reducing power of the corresponding metal is

Answer»

YgtZgtX
XgtYgtZ
ZgtYgtX
ZgtXgtY

SOLUTION :Lowerthe reductionpotentialstronger is thereducingagent .
Discussion
9735.

Which of the following haloalkanes is most reactive ?

Answer»

1 - CHLOROPROPANE
1 -BROMOPROPANE
2-chloropropane
2-bromopropane

Answer :4
Discussion
9736.

When propanone reacts with chlorine it forms:

Answer»

Trichloropropanone
Hexachloro propanone
Trichloroethanol
Trichloro propanal

Answer :A
Discussion
9737.

The Reagent which is commercially known as ‘calgon’ that is used to remove the permanent hardness of water in Calgon’s method. Find out the number of moles of calgon required to remove 12 moles ofCa^(2+)ion present in hard water.

Answer»


Solution :Sodium hexametaphosphate `[Na_(6)P_(6)O_(18)]` is known as calgon. When it is added to HARD water the following REACTION takes place.
`Na_(6)P_(6)P_(18)to 6Na^(+)+P_(6)O_(18)^(6-)`
`3Ca^(2+)+N_(6)P_(6)O_(18)to 6 Na^(+)+Ca_(3)P_(6)O_(18)`
`{:("3 mole","1 mole"),("12 mole","4 mole"):}`
Discussion
9738.

Which of the following is correct for carbonyl compounds :

Answer»




ANSWER :B
Discussion
9739.

The structural formula of hypophophorus acid is

Answer»




SOLUTION :`H_(3)PO_(2)` is hypophosphorous acid.
Discussion
9740.

Which of the following is correct for Arrhenilus equation k=Ae^(-E_(a)//RT)

Answer»

k is the rate of reactionat ZERO CONCENTRATION of reactants
A may be termed as the rate constannt at very high temperature
A may be termed as the rate CONSTANT at zero activation ENERGY
`E_(a)` is the activation energy of reactants

Solution :`K=A.e^((EA)/(RT))`
b. at high `TimpliesK=A.e^((0))impliesK+A` (c). At `E_(a)=0impliesA.e^(-(0))impliesK=A`
Discussion
9741.

underset(CH_(2)OH)underset(|)overset(CHO)overset(|)((CHOH)_(4)) rarr underset(CH_(2)OH)underset(|)overset(COOH)overset(|)((CHOH)_(4)) Reagent responsible for given conversion will be

Answer»

`Ag_(2)O,NH_(4)OH`
`Br_(2),H_(2)O `
`Cu^(+)`
All

Answer :D
Discussion
9742.

Two liquids A and B are mixed temperature T in a certain ratio to form an ideal solution. It is found that the partial pressure of A i.e., p_(A) is equal to p_(B), the vapour pressure of B for the liquid mixture. What is the total vapour pressure of the liquid mixture in terms of p_(A)^(@) and p_(B)^(@) ?

Answer»

<P>`(p_(A)^(@)p_(B)^(@))/(p_(A)^(@) + p_(B)^(@))`
`(2p_(A)^(@)p_(B)^(@))/(p_(A)^(@) + p_(B)^(@))`
`p_(A)^(@)/(p_(A)^(@) + p_(B)^(@))`
`(2p_(B)^(@))/(p_(A)^(@) + p_(B)^(@))`

ANSWER :B
Discussion
9743.

The two electrons present in an orbital are distinguished by

Answer»

Principal quantum NUMBER
Azimuthal quantum number
Magnetic quantum number
spin quantum number.

Solution :Two ELECTRON present in an orbital must have different spin quantum number i.e. `+1//2` or `-1//2`
Discussion
9744.

Which of the following is not an actinide?

Answer»

Curium
Califormnium
Uranium
Terbium

Solution :Terbium is a lanthanide as it belongs to 4f-series having configuration `[XE]4f^(9)`, `6S^(2)`. HOWEVER, the REMAINING members belong to 5f-series of actinides.
Discussion
9745.

Which of the following is/are correct form of Heisenberg's indeterminacy principle?

Answer»

`DeltapxxDeltaxgeh/2`
`DeltavxxDeltaxgeh/(2M)`
`DeltaExxDetatgeh/2`
`DeltapxxDeltaEgeh/(2m)`

ANSWER :A::B::C
Discussion
9746.

Which of the following functional groups is generally least reactive towards nucleophilic substitution reaction?

Answer»

Amide
Ester
Acid chloride
Acid Anhydride

Answer :A
Discussion
9747.

Which one of the following is used for making unbreakable crockery?

Answer»

PHENOL FORMAL dehyde
MELAMINE formal dehyde
urea formal dehyde
NAVOLAC

SOLUTION :melamine formal dehyde
Discussion
9748.

Which of the following isotopes is likely to be most stable?

Answer»

`""_(30)ZN^(71)`
`""_(30)Zn^(66)`
`""_(30)Zn^(64)`
NONE of these

Solution :In (C) both n and p are even and n/p ratio is minimum.
Discussion
9749.

When 20 g of naphthoic acid (C_(11)H_(8)O_(2)) is dissolved in 50 g of benzene (K_(f) = 1.72 "K kg mol"^(-1)), a freezing point depression of 2 K is observed. The van't Hoff factor (i) is

Answer»

`0.5`
1
2
3

Solution :Molecular weight of napthoic acid, `C_(11)H_(8)O_(2)` is `172 g mol^(-1)`
The theoretical value of depression in freezing point = `k_(f)xx` MOLALITY `=1.72xx(20xx1000)/(172xx50)=4K`
`therefore` Van't Hoff factor i=
`("Observed value of colligative property")/("Theoretical value of colligative property")=(2)/(4)=0.5`
Discussion
9750.

Which of the following crystals do not crystallise in HCP structure.

Answer»

Na
Be
CA
Ba

Solution :Na has BCC PACKING, Be has a HCP packing Ca has FCC packing Ba has a FCC packing.
Discussion