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20701.

Which of the following pair contains 2 long pair of electrons on the central atom?

Answer»

`I_(3)^(+), H_(2)O`
`H_(2)O, NF_(3)`
`XeF_(4), NH_(3)`
`SO_(4)^(2-), H_(2)S`

Solution :(a):
Discussion
20702.

What are the uses of acetaldehyde?

Answer»

SOLUTION :(i) Acetaldehyde is USED for silvering of MIRRORS (ii) PARALDEHYDE is used in medicine as a hypnotic. (iii). Acetaldehyde is used in the commercial preparation of organic COMPOUNDS like acetic acid, ethyl acetate etc.,
Discussion
20703.

Which one is wrong in the following statements

Answer»

Gold is CONSIDERED to be the king of metals
Gold is soluble in mercury
Copperis ADDED to gold to MAKE it hard
None of these

Answer :D
Discussion
20704.

When W_(B)gm solute (molecular mass M_(B)) dissolves in W_(A)gm solvent. The molality M of the solution is

Answer»

`(W_(B))/(W_(A))XX(M_(B))/(1000)`
`(W_(B))/(M_(B))xx(1000)/(W_(A))`
`(W_(A))/(W_(B))xx(1000)/(M_(B))`
`(W_(A)xxM_(B))/(W_(B)xx1000)`

ANSWER :B
Discussion
20705.

Write the names of the monomers of the following polymers: [--N overset(H)overset(|)N -(CH_2)_6 - overset(H)overset(|)N-overset(O)overset(||)C-(CH_2)_4 - overset(O)overset(||)C --]_n

Answer»

SOLUTION :(i) HEXAMETHYLENEDIAMINE (II) ADIPIC ACID.
Discussion
20706.

Units of specific conductivity are _________.

Answer»

SOLUTION :`OHM^(-1)CM^(-1)` or`S cm^(-1)`
Discussion
20707.

What is maximum no. of hydrogen bonds in which a water molecule may participate is :

Answer»

1
2
3
4

Answer :D
Discussion
20708.

When 1 mole of oxalic acid is treated with excess of NaOH in dilute aqueous solution 108kJ of heat is liberated ,then the enthalpy of ionization of the oxalic acid is(Given H^+(aq)+OH^-(aq)rarrH_2O(l)Delta_neulH=-57.3kJ)

Answer»

`4.6kJ MOL^(-1)`
`-4.6kJ mol^(-1)`
`-6.6kJ mol^(-1)`
`6.6kJ mol^(-1)`

ANSWER :D
Discussion
20709.

which of the following graph is correct representation between atomic number (Z) and magnetic moment of d-block elements? [outer electronic configuration: (n-1)d^(x)ns^(1 or 2)]

Answer»




Solution :Magnetic moment=`SQRT(n(n+2))BM`
N:Number of unpaired `e^(-)`
As atomic number INCREASES in d-block element number of unpaired `e^(-)` FIRST increases upto MIDDLE then DECREASES.
Discussion
20710.

Which one fo the following statements is false

Answer»

AVAGADRO number `= 6.02 XX 10^(21)`
The relationship between average velocity `( bar(v))` and root MEAN square velocity `( u ) ` is `bar(v)= 0.9213 u`
The mean kinetic energy of an IDEAL gas is independent of the pressure of the gas
The root mean square velocity of the gas can be calculated by the formula `(3 RT // M)^(1//2)`

SOLUTION :Avagadro number `= 6.023 xx 10K^(23)`
Discussion
20711.

Which of the following is a true structure of H_(2)O_(2) ?

Answer»




ANSWER :B
Discussion
20712.

What is DeltaU for the processdescribed by figure . Heat supplied duringtheprocess q= 100 kJ

Answer»

`+50 kJ`
` -50 kJ`
`-150 KJ`
`+ 150 kJ`

Solution :`DELTAU =q + W`
` = 100 -[1 xx 1 + 1//2xx 1]"BAR" m^(3)""("1 bar " m^(3) = 10^(5) J= 100 k)`
`= - 50 kJ`
Discussion
20713.

What happens when (a) Butanone is treated with methylmagnesium bromide and then hydrolysed, and (b) Sodium benzoate is heated with soda lime?

Answer»

SOLUTION :(a) `UNDERSET("Butanone")(CH_(3)-overset(CH_(3))overset(|)overset(CH_(2))overset(|)C=O)+CH_(3)MgBr to CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)overset(CH_(2))overset(|)C-OMgBr overset(H_(2)O)underset(-Mg(OH)Br)tounderset("2-Methylbutan-2-ol")(CH_(3)-CH_(2)-underset(CH_(3))underset(|)overset(OH)overset(|)C-CH_(3))`
(b) `underset("Sodium benzoate")(C_(6)H_(5)COONa+NaOH) underset("Heat")overset("Soda lime")to underset("Benzene")(C_(6)H_(6))+Na_(2)CO_(3)`
Discussion
20714.

Which of the following ions show higher spin only magnetic moment value ?

Answer»

`Ti^(3+)`
`Mn^(2+)`
`Fe^(2+)`
`Co^(3+)`

SOLUTION :`Ti^(3+)= 3D^(1) , Mn^(2+)= 3d^(5) , (t_(2g)^(3) e_(G)^(2)), Fe^(2+) = 3d^(6) ( t_(2g)^(4) e_(g)^(2)), Co^(3+) = 3d^(6) ( t_(2g)^(6) e_(g)^(0) ) `. In `Co^(3+)` , crystal fieldsplitting ENERGY (CFSE) is highand so electrons pair up in `t_(2g)` . Thus, only `Mn^(2+)` and `Fe^(2+)` show higher spin magnetic moment value.
Discussion
20715.

Which of the following polymer turns yellowish on exposure to sunlight

Answer»

POLYSTYRENE
Nylon
Polyethylene
STYRENE BUTADIENE RESIN

ANSWER :D
Discussion
20716.

Write geometrical isomers of [CoCl_(3)(NH_(3))_(3)] .

Answer»

Solution :It EXISTS as TWO GEOMETRICAL isomers . These are fac-isomer and mer-isomer . For details , consult section 7 .
Discussion
20717.

The stability order of halides of VI A group elements

Answer»

`F GT CL gt BR gt I`
`Cl gt Br gt I gt F`
`I gt Br gt Cl gt F`
`Br gt Cl gt F gt I`

ANSWER :A
Discussion
20718.

Which of the following is for oxidatin of SO_(2) to SO_(3) in contact process ?

Answer»

`MnO_(2)`
`CuCl_(2)`
`V_(2)O_(5)`
FE and Mo

ANSWER :A::C
Discussion
20719.

Which of the following is an addition polymer :

Answer»

SBR
Glyptals
Terylene
Nylons

Answer :A
Discussion
20720.

What can be the maximum possible molarity of Co^(2+)ions in 0.1 M HC1 saturated with H_(2)S (K_(a) = 4 xx 10^(-21))? Given that K_(sp)for CoS is 2 xx 10^(-21)and concentration of saturated H_(2)S = 0.1 M

Answer»


Solution :`K_(a)(H_(2)S) = 4 xx 10^(-21)`
`=([H^(+)]^(2)[S^(2-)])/([H_(2)S]) =(0.1^(2) xx [S^(2-)])/(0.1)`
`rArr [S^(2-)] = 4 xx 10^(-20)` M
`[CO^(2+)] xx 4 xx 10^(-20) rArr [Co^(2+)] = 0.05` M
Discussion
20721.

Which of the following molecule is polar as well as planar?

Answer»




NONE of these

Solution :MOLECULE is CIS and PLANAR.
Discussion
20722.

Which of the sulphides of group II is orange ?

Answer»

CuS
CdS
`As_(2)S_(3)`
`Sb_(2)S_(3)`

ANSWER :d
Discussion
20723.

When 1 lit of air is burnt with a mixture calcium carbide and anhydrous calcium chloride, the reduction in volume of air is about

Answer»

10 ml
990 ml
100 ml
900ml

Answer :B
Discussion
20724.

Which of the following has square planar geometry

Answer»

`[FeCl_4]^(2-)`
`[NiCl_4]^(2-)`
`[PdCl_4]^(2-)`
`[CoCl_4]^(2-)`

ANSWER :C
Discussion
20725.

The work done by a system in an expansion against a constant external pressure is :

Answer»

`TRIANGLEP. triangleV`
`-P.triangleV`
Q
`V.triangleP`

ANSWER :B
Discussion
20726.

Which of the following is a secondary cell?

Answer»

DRY CELL
Leclanche cell
MERCURY cell
None of these

Answer :D
Discussion
20727.

This molecule can be enolized involving :

Answer»

`H_(2)`
`H_(BETA)`
`H_(GAMMA)`
Cannot be enolized

Answer :C
Discussion
20728.

The rusting of iron takes place as follows: 2H^(+) + 2e + 1//2O(2) rarr H_(2)O_((l)), E^(@) = +1.23 V Fe^(2+) + 2e rarr Fe_((s)), E^(@) = -0.44 V The DeltaG^(@) for the net process is :

Answer»

`-322 kJ mol^(-1)`
`161 kJ mol^(-1)`
`-152 kJ mol^(-1)`
`-76 kJ mol^(-1)`

SOLUTION :`E_(cell)^(@) = E_(OPFe)^(@) + E_(RPH_(2)O)^(@)`
`:. DELTAG^(@) = -nE^(@)F`
`= -2 XX 1.67 xx 96500 J`
`= -322.31 kJ mol^(-1)`
Discussion
20729.

Which of the following concentrations of NH_(4)^(+) will be sufficient to prevent the precipitation of Mg(OH)_(2) form a solution which is 0.01 M MgCl_2 and 0.1 M NH_3(aq.) Given that :K_(SP) of Mg(OH)_(2)=2.5xx10^(-11) and K_b for NH_3(aq)=2xx10^(-5)

Answer»

0.01 M
0.02 M
0.001 M
0.04 M

Solution :`K_(SP)=[Mg^(+2)][OH^(-)]^2`
`[OH^(-)]=SQRT((2.5xx10^(-11))/0.01)=5xx10^(-5)`
`K_b=([NH_4^+][OH^(-)])/([NH_3])`
So, `[NH_4^+]=0.04 M`
Discussion
20730.

What reagent is used in the Rosenmund reduction ?

Answer»

`H_(2)|Pd - BaSo_(4)`
`LiAlH_4`
`NH_(2)NH_(2)//KOH` / ETHYLENE Glycol
ZN - Hg | HCl

Answer :A
Discussion
20731.

Whichof thefollowingspecies isformedwhenethanamineis reactedwithconc. HCl ?

Answer»

`C_(2)H_(5)NH_(2)""^(+)CL^(-)`
`C_(2)H_(5)NH_(3)""^(+)Cl^(-)`
`(C_(2)H_(5))_(2)NH_(2)""^(+)Cl^(-)`
`C_(2)H_(5)NH^(+)Cl^(-)`

Answer :B
Discussion
20732.

Which of the following compounds is most reactive towards nucleophilic addition reactions?

Answer»

`CH_(3)-overset(O)overset(||)(C)-H`
`CH_(3)-overset(O)overset(||)(C)-CH_(3)`

Answer :A
Discussion
20733.

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

Answer»

Solution :Substances that reduce or abolish pain without causing impairment of CONSCIOUSNESS, mental confusion, incoordination or paralysis or some other disturbances of nervous SYSTEM are called analgesics. These are classified as under :
(i) Non-narcotic (non-addictive) analgesics
(ii) Narcotic analgesics.
These analgesics are chiefly used for the RELIEF of postoperative pain, cardiac pain and pains of terminal CANCER, and in CHILD birth.
Discussion
20734.

Which one is communicable disease?

Answer»

T.B
CHOLERA
A & B
sugar

SOLUTION :Both T. B, cholera are communicable
Discussion
20735.

The total number of electrons in 18 mL of water (density = 1 g mL^(-1) ) is

Answer»

`6.02 xx 10^23`
`6.02 xx 10^25 `
`6.02 xx 10^24 `
`6.02 xx 18xx 10^23`

Solution :Mass of water` = 18 ML xx 1g mL^(-1) = 18 g `
or= 1 mol
No. of molecules in 1 mol of water
` = 6.02 xx 10^23`
No. of ELECTRONS in 1 molecule of water
= 2 + 8 = 10
` THEREFORE ` No. of electrons in 1 mol of water
` = 6.02 xx 10^23 xx 10`
` = 6.02 xx 10^24 `
Discussion
20736.

Whichof the following is correctstatementaboutbasicityof a mines ? (1) smallerthe valueof pKb weakerthe base (2) Electron donatinggroupincreasesthe basicityof amines (3)d Electron withdrawinggroupdecreasethe basicityofamines (3)Electron withdrawinggroupdecreasethe basicityof amines (4) Aromaticaminesare more basicthanin aqueousamines ?

Answer»

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

Answer :B
Discussion
20737.

When pressure is increased at constant temperature.

Answer»

Rate of Haber's process decreses
solublity of gas in a liquid INCRESES
solubility of solid in a liquid increses
`2C_((s))+CO_(2)(g)hArr2CO_((g)),` RATIONS moves in the froward direction.

Solution :Solubility of gas in a liquid increases when pressure increases, This is according to Henry's Law.
Discussion
20738.

The total number of spectral lines obtained in Lyman series when an electron drops from 6th level is :

Answer»

10
15
20
6

Answer :B
Discussion
20739.

Which of the following complex species is not expected to exhibit optical isomerism ?

Answer»

`[Co(EN)_(3)]^(3+)`
`[Co(en)_(2)Cl_(2)]^(+)`
`[Co(NH_(3))_(3)Cl_(3)]`
`[Co(en)(NH_(3))_(2)Cl_(2)]^(+)`.

Solution :`[Co(NH_(3))_(3)Cl_(3)]` exists in two geometrical forms fac-and mer-isomer.

Both these forms are optically inactive. Therefore, `[Co(NH_(3))_(3)Cl_(3)]` does not show OPTICAL isomerism.
Discussion
20740.

Which of the following is molecular disease

Answer»

Allergy
CANCER
German measeles
Sickel-cell-anaemia

Solution :"Cancer" is KNOWN as MOLECULAR DISEASE.
Discussion
20741.

Which of the following statementsabout the interstitial compounds is incorrect ?

Answer»

They RETAIN metallic conductivity
Thry are chemically reactive
They are MUCH harder than the pure METAL
They have higher melting POINTS than pure metal.

Solution :Inerstitial COMPOUNDS are chemicallyinert and not reactive . Hence, (b) is incorrect.
Discussion
20742.

Which of the following compound can not give Iodoform when react with IO^(-) (hypoiodite).

Answer»

`CH_(3)-underset(O)underset(||)(C )-OH`
`Ph-underset(O)underset(||)(C )-CH_(3)`

SOLUTION :`(CH_(3)-underset(O)underset(||)(C )-),(CH_(3)-underset(OH)underset(||)(C )-` groups gives positive iodoform test.
Discussion
20743.

Which of the following pairs can be distinguished by Fehling's solution?

Answer»

GLUCOSE, fructose
Ribose ,glucose
Glucose,sucrose
Fructose , sucrose

SOLUTION :Sucrose is a NON - reducingsugar.
Discussion
20744.

Whatis meant by (i) peptide linkage (ii) biocatalyst ?

Answer»

Solution :(i) Peptide LINKAGE: Peptide linkageis an amide formed between - COOHgroup and `-NH_(2)` group . Forexample, whencarboxyl group of glycine combines , withalanine, we get a dipeptide , glycylalanime .

(ii) Biocatalysts : Biocatalysts or enzymeare complex nitrogenous organiccompounds . Theycatalyseone particularreaction.
`C_(2)H_(5)OH + O_(2) overset("Mycoderma acetic")to CH_(3)COOH+ H_(2)O`
`C_(12)H_(22)O_(11) + H_(2)O overset("Invertase")to underset("Glucose")(C_(6)H_(12)O_(6)) + underset("FRUCTOSE ")(C_(6)H_(12)O_(6))`
`C_(6)H_(12)O_(6)overset("Zymase")to2C_(2)H_(5)OH + CO_(2)`
Discussion
20745.

Which the followingamines is the least basic ?

Answer»

I
II
III
All have same BASIC STRENGTH

ANSWER :B
Discussion
20746.

What is the produce when OH.OH_(2).CH_(2).OH is heated with periodic acid?

Answer»

2HCOOH
`underset(CHO)underset(|)CHO`

`2CO_(2)`

SOLUTION :`underset("ETHANOL 1,2 di-ol")(underset(CH_(2)OH)underset(|)CH_(2)OH) overset(HIO_(4))to underset("(methanal)")(underset("Formoldehyde")(2HCHO))`
`underset(CH_(2)OH)underset(|)CH_(2)OH overset([O])to underset("Glyoxal")(underset(CHO)underset(|)CHO) overset([O])to underset("Oxalic acid")(underset(COOH)underset(|)COOH)`
Discussion
20747.

What is the similarity between Raoult's law and Henry's law ?

Answer»

<P>

Solution :According to both of them, the partial PRESSURE of the volatile component is directly proportional to its mole FRACTION in the solution `(P_(A)propX_(A))`. However, the proportionality CONSTANT `P_(A)^(@)` and `K_(H)` are defferent. For more details, consults SECTION 5.
Discussion
20748.

The wave number of first line of Balmer seriesof H-atom is 15200cm^(-1). The wave number of first Balmer line of Li^(2+) ion is:

Answer»

`15200cm^(-1)`
`60800cm^(-1)`
`76000cm^(-1)`
`136,800cm^(-1)`

Solution :`lamda_(e)=h/(mv)=h/(MX)`
`lamda_(N)=h/(mv)=h/(1840mx)(m_(n)=1840m_(e))`
`lamda_(e)=lamda_(n)` or `h/(mx)=h/(1840mv)`
or `v=x//1840`
Discussion
20749.

Which of the foloowingf statements are correct for temperature dependence of an exothermic reversible reaction ?

Answer»

On INCREASING TEMPERATURE, `K_(f)` increases while `K_(b)` decreases.
On increasing temperature, both `K_(f)` and `K_(b)` increases.
On increasing temperature, increases in `K_(b)` MUST be more than increase in `K_(f)`
On increasing temperature percentage increase in `K_(b)` will be more than percentage increase in `K_(f)`

Answer :B::D
Discussion
20750.

Which pair of compounds is expected to show similar colour in aqueous medium :

Answer»

`FeCl_(2)` and `CuCl_(2)`
`VOCI_(2)` and `CuCl_(2)`
`VOCI_(2)` and `FeCl_(2)`
`FeCl_(2)` and `VCI_(4)`

Answer :A
Discussion