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23101.

Write the electronicconfiguration of the element with atomicnumber 102.

Answer»

SOLUTION :`[Rn]^(88)5f^(14)4d^(0)7S^(2)`
Discussion
23102.

Which of the following forms a colloidal solution in water ?

Answer»

NaCl
glucose
starch
barium nitrate

Answer :C
Discussion
23103.

The vapour pressure of a dilute solution of a solute is not influenced by :

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Temperature of solution
MELTING point of solute
MOLE fraction of solute
Deegree of DISSOCIATION of solute

Answer :B
Discussion
23104.

Which of the folliowing metal oxides is anti-ferromagnetic in nature?

Answer»

`MnO_(2)`
`TiO_(2)`
`VO_(2)`
`CrO_(2)`

SOLUTION :`MnO_(2)`.
Discussion
23105.

Which of the following is used in pyro-techniques

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`NH_(3)`
`HNO_(3)`
`PH_(3)`
`H_(3)PO_(4)`

Answer :B
Discussion
23106.

The standard electromotive force of the cell Fe|Fe_((aq))^(2+) ||Cd_((aq))^(2+) |Cd If the temperature co-officlent of emf -0.125 VK^(-1), the vàlue of triangleS^(@)" at "25^@C would be

Answer»

`-20.125 KJ K^(-1)`
`-24.125KJ K^(-1)`
`26.125KJ K^(-1)`
`-22.125KJ K^(-1)`

Solution :`(dE^(@))/(dT)=(triangleS^(@))/(NF)`
`RARR triangleS^(@)=((dE^@)/(dT)) xx nF`
`=-0.125 xx 2 xx 96500`
`=-24.125 xx KJ K^(-1)`
Discussion
23107.

V.P. of a solution containing non-volatile solute is

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more than the vapour PRESSURE of a solvent
lass that the vapour pressure of solvent
EQUAL to the vapour pressure of solvent
none

Solution :ADDITION of non-volatile SOLUTE ALWAYS lowers the vapour pressure.
Discussion
23108.

Which of the following is/are correctly matched?

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COPPER - BESSEMER converter.
Iron-Blast furnance
Chlromium -Aluminothermic process
Tin- Electrolytic reduction

Answer :A::B::C
Discussion
23109.

Write the mechanism of the reaction of HI with methoxymethane.

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Solution :With equimolar AMOUNTS of HI and METHOXYMETHANE, a mixture of methyl ALCOHOL and methyl iodide is obtained. The mechanism is gien as under :

If however, excess of HI is used, methyl alcohol formed in STEP 2 is also converted into methyl iodide. This is explained by the following mechanism.

Discussion
23110.

Which of the following pair of transition metal ions, have the same calculate values of magnetic moment ?

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`Co^(2+)`
`CU^(2+)`
`Mn^(2+)`
`SC^(3+)`

ANSWER :C
Discussion
23111.

Which of the following has tetrahedral geometry?

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HOBr
`HClO_(2)`
`HBrO_(3)`
`HIO_(4)`

ANSWER :D
Discussion
23112.

What are non-ideal solutions ? Mention the reason for the negative deviation from the Raoult's law.

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Solution :The solutions which do not obey Raoult.s Law over the ENTIRE range of CONCENTRATION and temperature ARECALLED as non-ideal solutions.
The reason for the negative deviation from Raoult.s law is that the INTERMOLECULAR ATTRACTIVE forces betweenA-A & B-B are weaker than those between A-B and leads to decrease in vapour pressure.
Discussion
23113.

Which of the following amines gives yellow oily liquid with nitrous acid?

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Ethyl amine
METHYL amine
Diethyl amine
TRIETHYL amine

ANSWER :C
Discussion
23114.

What happens to freezing point of water if ethylene glycol is added to it?

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SOLUTION :FREEZING point of water gets LOWERED.
Discussion
23115.

Which two of the following groups are used to block a definite position in the benzene ring-

Answer»

`-SO_3H`
`-CH_3`
`-CF_3`
`-Cme_3`

ANSWER :A::D
Discussion
23116.

Two types of FXF angles are present in which of the following molecule (X = S, Xe, C)

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`SF_(4)`
`XeF_(4)`
`SF_(6)`
`CF_(4)`

Solution :In `SF_(4)`, FSF bond angles are `173^(@) and 102^(@)`.
Discussion
23117.

Which is not linear?

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`CO_2`
HCN
`C_2H_2`
`H_2O`

ANSWER :D
Discussion
23118.

Write the order of thermal stability of the hydrides of Group 16 elements.

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Solution :As the SIZE of the element increases down the group , the E-H (E stands for elements of Group 16 ) bond dissociation energy decreased and henced E-H bond BREAKS more easily . Thus, the thermal stability of the HYDRIDES of Group 16 elements decreases down the Group :
`H_2O gt H_2S gt H_2Se gt H_2Te gt H_2Po`.
Discussion
23119.

Whichof the following is not true of the halogens

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All of them have seven electrons in their OUTER shell
They either gain an electron by FORMING an IONIC bond or form a covalent COMPOUND by electron sharing
All exhibit variable valency
All form DIATOMIC molecules

Solution :Fluorine can not Exhibit variable valacy
Discussion
23120.

Which of the following ions has the smallest radius?

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`Be^(2+)`
`LI^(+)`
`O^(2-)`
`F^(-)`

ANSWER :A
Discussion
23121.

Write the equation for the extraction of silver by leaching with sodium cyanide and show that the leaching proces is a redox reaction.

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SOLUTION :The crushed ore of argentite `(Ag_(2)S)` is leached with sodium cyanide solution.This reaction froms sodium argento cyanide Na `[Ag(CN)_(2)]`.
Step1. `Ag_(2)S+4NaCN hArr2Na[Ag(CN)_(2)]+Na_(2)S`
The solution of sodium argento cyanide combines with zinc dust and forms sodium TETRA cyano zincate and precipitated silver.
Step2:`Zn+2Na[Ag(CN)_(2)]toNa2[Zn(CN)_(4)]+2Ag darr`
In the step2,REDOX reaction TAKE place.
` (0)""(2+)`
`Zn "" to ""Zn` (Oxidation)
`(+1)""(0)`
`Ag "to"Ag(REDUCTION)`.
Discussion
23122.

The vitamin which is water soluble and antioxidant is

Answer»

VITAMIN E
vitamin D
vitamin C
vitamin `A_(1)`

ANSWER :C
Discussion
23123.

Which posses the tendecy of complex formation

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d-block ELEMENTS
p-block elements
s-block elements
elements of ZERO GROUP

ANSWER :A
Discussion
23124.

Which option is true?

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AEROSOL - SMOKE
Glass - Gel
Emulsion - Colour
Foam - FOG 

SOLUTION :Aerosol - Smoke
Discussion
23125.

The ultimate product of the hydrolysis of starch is :

Answer»

Glucose
Fructose
Sucrose
None

Answer :A
Discussion
23126.

Which of the following is diamagnetic ?

Answer»

`H_(2)^(+)`
`He_(2)^(+)`
`O_(2)`
`N_(2)`

SOLUTION :`N_(2)` molecule is DIAMAGNETIC because it does not have any UNPAIRED electron.
Discussion
23127.

Which one of the following nitroalkanes will give nitrolic acid with NaNO_2//conc. H_2SO_4

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`CH_3-UNDERSET(CH_3)underset(|)(CH)-NO_2`
`C_2H_3-underset(CH_3)underset(|)OVERSET(CH_3)overset(|)(C)-NO_2`
`CH_2-underset(CH_3)underset(|)(CH)-CN_2-NO_2`
All of the above

ANSWER :C
Discussion
23128.

When nuclear energy is intended to be harnessed for generation of electricity, potentially destructive neutron released in a nuclear reactor are absorbed by

Answer»

LONG rods of CD
Heavy water
Cubical BLOCKS of steel
Both (a) and (c)

Solution :The control rods used in nuclear reactor are MADE up of Cd `- 113or B-10`. They can absorb NEUTRONS
Discussion
23129.

The standard enthalpy of formation of H_(2(g)) and Cl_(2(g)) and HCl_((g)) are 218 kJ/mol and -92.31 kJ//mol respectively. Calculate standard enthalpy change in kJ for (1)/(2)H_(2(g))+(1)/(2)Cl_(2(g))rarrHCl_((g))

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`+431.99`
`-262.14`
`-431.99`
`+247.37`

Solution :`Delta_(r)H=DeltaH_("products")-DeltaH_("REACTANTS")`
`=-92.3-[(218)/(2)+(121.68)/(2)]=-92.3-[109+60.84]`
`=-262.14 kJ//mol`.
Discussion
23130.

The vapour pressure of a dilute solution of a solute is influeneced by:

Answer»

TEMPERATURE of the solution
mole FRACTION of the SOLUTE
melting POINT of the solute
degree of dessociation of the solute

Solution :(a,b,d) are all CORRECT.
Discussion
23131.

Tungsten crystallizes in a body centred cubic unit cell. If the edge of the unit cell is 316.5 pm, what is the radius of the tungsten atom?

Answer»

Solution :a = 316.5 pm
For BCC STRUCTURE, `R=(sqrt3)/(4)a=(sqrt3)/(4) xx 316.5` pm
= 317.04 pm
Discussion
23132.

Why are transition elements known as d-block elements ?

Answer»

SOLUTION :Transition ELEMENTS are calledd-block elementsbecauseare LAST ENTERS ( n-1) d-orbital,i.e, d-orbital of the penultimate shell.
Discussion
23133.

Which of the following is the strongest acid

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`SO(OH)_(2)`
`SO_(2)(OH)_(2)`
`CIO_(3)(OH)`
`PO(OH)_(3)`

Solution :It is a `HClO_(4)`.
Discussion
23134.

which of the followingis a flavouring agent called oil of wintergreen.:

Answer»

OLIVE oil
Vinegar
Methyl acetate
Methyl salicylate

Answer :D
Discussion
23135.

Give the bond dissociation order of halogens.

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`Br_(2)gtI_(2)gtF_(2)gtCl_(2)`
`F_(2)gtCl_(2)gtBr_(2)gtI_(2)`
`I_(2)gtBr_(2)gtCl_(2)gtF_(2)`
`Cl_(2)gtBr_(2)gtF_(2)I_(2)`

ANSWER :D
Discussion
23136.

Which of the following ions does not give white ppt. with BaCl_2 (aq) ?

Answer»

`SO_4^2`
`SO_3^2`
`S_2O_3^2`
`S^(2-)`

ANSWER :D
Discussion
23137.

Write the role of Cryolite in the extraction of aluminium.

Answer»

SOLUTION :Cryolite LOWERS the m.p. of ALUMINA to FACILITATE ELECTROLYSIS.
Discussion
23138.

Which of the following is not a pollutant ?

Answer»

Mercury
Arsenic
Lead
Aluminium

Answer :D
Discussion
23139.

Which of the following compound have larger C-O bond length than C-O bond length of H_(3)-overset(O)overset(||)(C)-CH_(3)?

Answer»




SOLUTION :BC
Discussion
23140.

Which of the following will show disproportionation when treated with 50% aqueous NaOH ?

Answer»

BENZYL Alcohol
Ethanol
Phenyl ethanol
m-Nitrobenzaldehyde

Answer :D
Discussion
23141.

What do you mean by the Nucleosides ?

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Solution :A UNIT formed by joining a HETEROCYCLIC BASE to 1 position of pentose SUGAR is KNOWN as nucleoside.
Discussion
23142.

Which one is the correct graph (fig.) for the corresponding acid base titration?

Answer»




ANSWER :A::B::C::D
Discussion
23143.

Which of the following contain an aldehyde?

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VANILLA beans
MEADOW sweet
CINNAMON
All of these

Solution :VANILLIN -vanilla beans
Salicylaldehyde -meadow sweet
Cinnamaldehyde -from cinnamon
Discussion
23144.

Whichof the following is not a semisynthetic polymer ?

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CIS - polyisoprene
CELLULOSE NITRATE
Cellulose acetate
Vulcanised rubber

Solution :cis - polyisoprene is a natural rubber.
Discussion
23145.

The shape of chloroform molecule is

Answer»

TETRAHEDRAL
PYRAMIDAL
PLANAR trigonal
Distorted tetrahedral

Answer :D
Discussion
23146.

Write the IUPAC name of the following complexes. (i) [Ag(NH_(3))_(2)]Cl (ii) [Co(en)_(2)Cl_(2)]Cl (iii)[Cu(NH_(3))_(4)]SO_(4) (iv) [Co(CO_(3))(NH_(3))_(4)]Cl (v) [Cr(NH_(3))_(3)(H_(2)O)_(3)]Cl_(3)

Answer»

SOLUTION :`(i) [Ag(NH_(3))_(2)]Cl` -Diammine SILVER (I) Chloride
`(ii) [CO(en)_(2)Cl_(2)]Cl` -Dichloridobis (ETHANE -`1,2`-diamine) Cobalt (III) chloride.
`(iii)[CU(NH_(3))_(4)]SO_(4)` -Tetraammine copper (II) Sulphate
`(iv) [Co(CO_(3))(NH_(3))_(4)]Cl` -Tetrammine carbanto cobalt (III) chloride
`(v) [Cr(NH_(3))_(3)(H_(2)O)_(3)]Cl_(3)`-Triammine tri aqua chrmium (III) chloride
Discussion
23147.

underset(S^(@)(298K)K^(-1)mol^(-1))(H^(+)(aq))+underset(-10.7)(OH^(-)(aq))rarrunderset(+70)(H_(2)O(l)) Standard entropy change for the above reaction is

Answer»

`60.3 JK^(-1) MOL^(-1)`
`80.7 JK^(-1) mol^(-1)`
`-70 JK^(-1) mol^(-1)`
`+10.7 JK^(-1) mol^(-1)`

Solution :`underset(S^(@)(298K)K^(-)mol^(-))(H_((aq))^(+))+underset(-10.7)(OH_((aq))^(-))rarrunderset(+70)(H_(2)O_((l)))`
`DELTAS^(@)(298 K)=DeltaS_(P)-DeltaS_(R)=70-(-10.7+0)`
`80.7 JK^(-)mol^(-1)`
Discussion
23148.

Vapour pressure of an aqueous solution of glucose is 750 mm of Hg at 373 K. Calcualte the molality and mole fraction of solution?

Answer»


Solution :`(760-750)/(760)=x_(2)or x_(2)=(10)/(760)." But "x_(2)=(n_(2))/(n_(1))." Total CALCULATE molality, calculate "n_(2)" when "w_(1)=1000G, i.e., n_(1)=1000//18" moles"`
Thus, `n_(2)=(10)/(760)xx(1000)/(18)=0.73`, i.e., molality = 0.73.
Discussion
23149.

Which of the following anions will have minimum flocculation value for the ferric oxide solution?

Answer»

`Cl^(-)`<BR>`Br^(-)`
`SO_(4)^(2-)`
`[Fe(CN)_(6)]^(3-)`

Solution :Higher the charge on coagulating ion, lesser tha flocculation VALUE.
Discussion
23150.

The salt which is not decomposed by dil. H_2 SO_4 and conc. H_2 SO_4, will contain

Answer»

Sulphite ion
chloride ion
nitrate ion
SULPHATE ion

SOLUTION :Sulphate is not decomposed by `H_(2)SO_(4)`.
Discussion