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19001.

Write the hybridisation of XeF_6 .

Answer»

SOLUTION :`sp^3 d^3`
Discussion
19002.

Which one is the unit of specific conductance?

Answer»

OHM m
`Ohm^(-1)` m
`Ohm m^(-1)`
`Ohm^(-1)m^(-1)`

ANSWER :D
Discussion
19003.

The relationship between osmotic pressure at 273 K when 10 g glucose (P_1), 10 g urea (P_2) and 10 g sucrose (P_3) are dissolved in 250 ml of water is:

Answer»

`P_1gtP_2gtP_3`
`P_3gtP_1gtP_2`
`P_2gtP_1gtP_3`
`P_2gtP_3gtP_1`

ANSWER :C
Discussion
19004.

What is X, in the following reaction ? KHSO_(4) + F_(2) rarr HF + X

Answer»

`K_(2)SO_(4)`
`K_(2)S_(2)O_(4)`
`K_(2)S_(2)O_(3)`
`K_(2)S_(2)O_(8)`

Solution :`F_(2)` acts as an oxidising AGENT and HENCE converts `KHSO_(4)` to `K_(2)S_(2)O_(8)` (X).
`2KHSO_(4) + F_(2) rarr 2 HF + underset(X) (K_(2)S_(2)O_(8))`
Discussion
19005.

Which of the following species contains three bond pairs and one lone pair around the central atom ?

Answer»

`PCl_(3)`
`H_(2)O`
`BF_(3)`
`NH_(2)^(-)`

SOLUTION :3 Bond pairs and 1 LONE pair.
Discussion
19006.

Which of the following will not give Cannizaro reaction ?

Answer»

`CH_3-UNDERSET(CH_3)underset(|)OVERSET(CH_3)overset(|)C-CHO`
`CL-underset(Cl)underset(|)overset(Cl)overset(|)C-CHO`

ANSWER :D
Discussion
19007.

Which the following produces NH_3on reaction with caustic soda?

Answer»

ETHYL AMINE
DIMETHYL amine
Acetamide
Aniline

Answer :C
Discussion
19008.

Which of the following species is non polar with presence of polar bond and lone pair of electron on central atom

Answer»

`CO_(2)`
`SF_(4)`
`XeF_(4)`
`CF_(4)`

ANSWER :C
Discussion
19009.

Which oxyacid is possible in fluorine?

Answer»

`HO_(2)F`
`HO_(4)F`
`HOF`
`HO_(3)F`

Answer :C
Discussion
19010.

The total possible coordination isomers for the following compounds respectively are : [Co(en)_(3)][Cr(C_(2)O_(4))_(3)] [Cu(NH_(3))_(4)][CuCl_(4)] [Ni(en)_(3)][Co(NO_2)_(6)]

Answer»

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

Answer :D
Discussion
19011.

The substance used in Breeder reactor is :

Answer»

`""_(93)^(239)NP`
`""_(94)^(239)Pu`
`""_(92)^(238)U`
`""_(92)^(239)U`

ANSWER :C
Discussion
19012.

Which of the following(s) when heated give nitrogen gas

Answer»

`(NH_(4))_(2) Cr_(2)O_(7)`
`Ba(N_(3))_(2)`
`NH_(4)NO_(3)`
both (a) and (b)

Solution :`(NH_(4))Cr_(2)O_(7) overset(Delta)N_(2)+Cr_(2)O_(3) +4H_(2)O`
`Ba(N_(3))_(2) overset(Delta)to3N_(2)+Ba`
`NH_(4)NO_(3) overset(Delta)to N_(2)O +2H_(2)O`
Discussion
19013.

Write reactions of the final alkylation product of aniline with excess of methyl iodide in the presence of sodium carbonate solution.

Answer»

Solution :`C_6 H_5+CH_3 I to[C_6 H_5overset(+ )(NH_2) CH_3 ]I^(-)`
` 2[C_6 H_5overset(+ )NH_2CH_3 ]I^(-) +Na_2 CO_3to 2C_6NHCH_3CH_3 +2NAL +CO_2+H_2 O`
`C_6H_5 NHCH_3underset( Na_2 CO_3) OVERSET(CH_3 I)to C_6 H_5N (CH_3)_2`
` C_6 H_5 N (CH_3)_2 +CH_3 I to UNDERSET("N,N,N-Trimethylaniliniumiodide")([C_6 H_5 overset(+)N (CH_3)_3 ]I^(-) underset(Na_2CO_3) overset(-2Nal)to+ underset("N.N.N-Trimethylanilinium carbonate ")( [C_6 H_5overset(+) N (CH_3)_3 ]_2CO_(3)^(2-))`
Discussion
19014.

Write the name of the cell which is generally used in transistors. Write the reactions taking place at the anode and the cathode of this cell.

Answer»

SOLUTION :DRY cel,
`{:("Anode", Zn(s) to Zn^(2+) + 2e^(-)),("Cathode", MnO_(2) + NH_(4)^(-) + e^(-) to MnO(OH) + NH_(3)):}`
Discussion
19015.

Which of the following is formed when CO_(2) gas is passed through aqueous solution of sodium chromate

Answer»

`CR(OH)_3` is precipitated
Yellow solution of `Cr_(2)(CO_(3))_(3)` is FORMED
Orange solution of `Na_(2)Cr_(2)O_(7)` is formed
No reaction

Answer :C
Discussion
19016.

Two metals showing cubic close packed (ccp) structure are_____and_____

Answer»

SOLUTION :COPPER and SILVER
Discussion
19017.

Zinc sulphate crystals contain 22.6% of zinc and 43.9% of water. Assuming the law of constant proportions to be true, how much zinc should be used to produce 13.7 g of zinc sulphate and how much water will they contain?

Answer»

Solution :100G of zinc sulphate CRYSTALS are obtained from
=22.6g zinc
1 G of zinc sulphate crystals will be obtained from
=22.6g zinc
1 g of zinc sulphate crystals will be obtained from
=22.6/100g zinc
13.7g of zinc sulphate crystals will be obtained from
`=(22.6)/(100)xx13.7=3.0962 g` of zinc
100 g of zinc sulphate crystals contain WATER =43.9g
1 g of zinc sulphate crystals contain water =43.9/100g
13.7g of zinc sulphate crystals shall contain water
`=(43.9)/(100)xx13.7=6.0143g`.
Discussion
19018.

What type of isomerism is shown by [Co(NH_(3))_(5)ONO]Cl_(2) ?

Answer»

Solution :It shows linkage ISOMERISM . For DETAILS , CONSULT section 6.
Discussion
19019.

Which of the following curves is in accordance with Freundlich adsorption isotherm?

Answer»

<P>


Solution :`(x)/(m) prop p^((1)/(N))RARR (x)/(m)=kP^((1)/(n))","log((x)/(m))=(1)/(n)logP+logk`
Discussion
19020.

What do you mean by leaching?

Answer»


ANSWER :REFER THEORY SECTION 6.2.4
Discussion
19021.

The reddish-brown gas escaping on heating a chloride and K_2Cr_2O_7 mixture with conc. H2SO_4

Answer»

`Cl_(2)`
`CrO_(2)Cl_(2)`
`CrO_(3)`
`H_(2)CrO_(4)`

ANSWER :B
Discussion
19022.

Which of the following has the smallest bond length ?

Answer»

1. `O_(2)`
2. `O_(2)^(-)`
3. `O_(2)^(+)`
4. `O_(2)^(2-)`

ANSWER :C
Discussion
19023.

Find the decay constant of .^(55)Co radio nuclide if its activity is known to decrease 4% per hour. The decay product is non-radioactive.

Answer»


SOLUTION :`t_("AVG")=(1)/(lambda) " " lambda xx 1 =ln(100)/(96) " " lambda=0.04 HR^(-1)`
`t_("avg")=(1)/(lambda)=25 xx60 xx=1500`
Discussion
19024.

Which of the following polymers have vinylic monomer units ?

Answer»

ACRILAN
POLYSTYRENE
NYLON
Teflon

Solution :
Discussion
19025.

The standard reduction potential of the half -cell: NO_(3)^(-)(aq)+2H^(+)+e rarr NO_(2)(g)+H_(2)O is 0.78V. (1) Calculate the reduction potential in 8 M H^(+).

Answer»

Solution :Reaction :
`NO_(3)^(-)(aq)+2H^(+)(aq)+e rarr NO_(2)(g)+H_(2)O(l)`
`E_("CELL")=E_("cell")^(@)-(0.059)/(N)LOG.([NO_(2)][H_(2)O])/([NO_(3)^(-)][H^(+)]^(2))`
`=0.78-(0.059)/(1)log.(1xx1)/(1XX(8)^(2))=0.887V`
Discussion
19026.

Which reaction gives colloidal solution

Answer»

`Cu+HgCl_(2)rarr CuCl_(2)+Hg`
`2HNO_(3)+3H_(2)S rarr 3S +4H_(2)O+2NO`
`2Mg+CO_(2)rarr2MgO+C`
`Cu+CuCl_(2)rarrCu_(2)Cl_(2)`

ANSWER :B
Discussion
19027.

Which of the following defect is not exihibitted by NaCl ?

Answer»

SCHOTTKY defect
F Centre
Impurity defect
Frenkel defect

Answer :D
Discussion
19028.

Write the average rate of the following reaction . aA+bB rarr c C +dD

Answer»

Solution :Rate of the REACTION =`-(1)/(a)(d[A])/(dt)=-(1)/(B)(d[B])/(dt)=(1)/(c)(d[C])/(dt)=(1)/(d)(d[D])/(dt)`
Discussion
19029.

The solubility of a gas in liquid at a temprature is directly proportional to its:

Answer»

Density
Melting point
Boiling point
Pressure

Answer :D
Discussion
19030.

What is X in the following sequence of reactions? X overset(Na)underset(1//2 H_2) (to) Y overset(NaOH // CaO)underset(Delta)(to) CH_4

Answer»

Methanoic acid
ETHANOIC acid
Propane
Methane

Solution :`underset("(X)") underset("Ethanoic acid") (CH_(3) COOH) overset(Na)underset(-1//2 H_2)(to) CH_(3) underset("Y")(COO)Na overset(NaOH//CaO)underset(Delta)(to) CH_4`
Discussion
19031.

Zeolites are extensively used in :

Answer»

SOFTENING of WATER and catalyst
Preparing HEAVY water
Increasing the HARDNESS of water
MOND's process

Answer :A
Discussion
19032.

Write the main structural difference betwee DNA andRNA .of thetwo bases , thymine and uracil, whichone is presentin DNA ?

Answer»

SOLUTION :STRUCTURAL DIFFERENCEBETWEEN DNA and RNA:

Discussion
19033.

To which colloidal system does smoke belong?

Answer»

SOLUTION :SOLID DISPERSED in AIR.
Discussion
19034.

Zirconium and titanim are purified by

Answer»

Electrolysis
Zone REFINING
BESSEMERISATION
Van-arkel METHOD

ANSWER :D
Discussion
19035.

Which of the following elements constitutes a major impurity in pig iron

Answer»

Si
O
S
 Graphite

Answer :D
Discussion
19036.

Under the influence of an electric field the particles in a sol migrate towards cathode. If the sol solutions. Their coagulation values will be in the order

Answer»

`NaClgtNa_(2)SO_(4)gtNa_(3)PO_(4)`
`NaClltNa_(2)SO_(4)ltNa_(3)PO_(4)`
`Na_(2)SO_(4) gtNaCl GT Na_(3)PO_(4)`
`Na_(2)SO_(4)gtNa_(3)PO_(4)gtNaCl`

Solution :
Both can be SEPARATED by `NaHCO_(3)`
Discussion
19037.

Which of the following pairs has heat of neutralisation equal to -57.1 kJ "mol"^(-1)?

Answer»

`HNO_(3).KOH`
`HCl.NH_(4)OH`
`H_(2)SO_(4).NH_(4)OH`
`CH_(3)COOH.NaOH`.

Answer :A
Discussion
19038.

What is mer isomer?

Answer»

Solution :(i) If the three similar LIGANDS are PRESENT around the meridianwhich is an imaginary semicircle from one apex of theoctahedral to the opposite apex ,the isomer is called as a meridioanl isomer (mer isomer )
(ii) This is called MERIDIONAL because each set of ligands can be REGARDED as lying on a meridian of an octahedron.
Discussion
19039.

Which reduce enough moisture from food ?

Answer»

Sugar
Benzoic acid
Acetly SALICYCLIC acid
Vinegar

Answer :A
Discussion
19040.

Which statement is not correct for an enzyme :

Answer»

It acts as a biocatalyst
Its aqueous SOLUTION is colloidal
It can catalyse any chemical reaction
Its CATALYTIC EFFICIENCY is temperature dependent

Answer :C
Discussion
19041.

Which reduces carboxylic acid directly to primary alcohols :

Answer»

`LiAlH_4`
`NA + C_2H_5OH`
`NaBH_4`
All

Answer :D
Discussion
19042.

Which is the correct electron dot structure of N_(2)O molecules

Answer»

`:N=N=OVERSET(..)UNDERSET(..)(O)`
`:N-=N^(+)-overset(..)underset(..)("O:")^(-)`
`overset(..)underset(..)(N)-overset(..)(N)=overset(..)underset(..)(O)`
`:N=N=overset(..)underset(..)("O:")`

SOLUTION :`:N-=N^(+)-overset(..)underset(..)("O:")` or `N-=N to O`
Discussion
19043.

Which one of the foloowing compound will undergo hydrolysis at a faster rate by S_(N)1mechanism ? Justify .

Answer»

Solution : will UNDERGO `S_(N)1` REACTION faster .
Greater the stability of the carbocation , greater will be its ease of formation from the corresponding halide and faster will be the rate of reaction .
The benzylic carbocation formed gets stablished through resonance. 1

`CH_(3)CH_(2)CH_(2)Cl` forms a `1^(@)`carbocation , which is less stable than benzylic carbocation .
Discussion
19044.

Which one of the following statements is not true regarding catalyst ?

Answer»

A catalyst remains unchanged at the END of the reaction.
A catalyst can INITIATE a reaction,
A catalyst does not alter the equilibrium in a REVERSIBLE reaction.
Catalysts are sometimes very SPECIFIC in terms of reactions. Colloids

Answer :B
Discussion
19045.

Which of the following reagents are involved in the followintg transformation?

Answer»

`H_(3)O^(+)`
`LiAIH_(4)`
`Ethylene GLYCOL
Acetone and propionic acid

ANSWER :A::B::C
Discussion
19046.

Which on reaction with water will have pH less than 7

Answer»

BAO
CaO
`Na_(2)O`
`P_(2)O_(5)`

Solution :`BaO, CaO` and `Na_(2)O` are shows more than 7 pH because of their BASIC nature.
Discussion
19047.

Which is the correct expression, that relates changes of entropy with the change of pressure for an ideal gas at constant temperature in the following

Answer»

`DeltaS=nRTln.(P_(2))/(P_(1))`
`DeltaS=T(P_(2)-P_(1))`
`DeltaS=nRln.(P_(1))/(P_(2))`
`DeltaS=2.303 nRT ln.(P_(1))/(P_(2))`

ANSWER :C
Discussion
19048.

What happens when D-glucose is treated with the following reagents ? (i) HI (ii) Bromine water (iii) HNO_(3).

Answer»

SOLUTION :
Discussion
19049.

Which of the following compounds will show geometrical isomerism -

Answer»

2-Butene
Propene
1-Phenylpropene
Both A & C

Answer :D
Discussion
19050.

Zone refining has been employed for preparing ultra pure samples of :

Answer»

Cu
Na
Ge
Zn

Answer :C
Discussion