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12901.

The shape of SO_(4)^(2-) is

Answer»

SQUARE planar
trigonal pyramidal
tetrahedral
hexagonal

Answer :C
Discussion
12902.

Which oxidation number is possessed by compound of Mn?

Answer»

`+4`
`+5`
`+6`
`+7`

ANSWER :D
Discussion
12903.

Under what conditions of temperatue and pressure the formation of atomic hydrogen from molecular hydrogen will be favoured most

Answer»

HIGH temperatuer and high PRESSURE
Low temperatue and low pressure
High temperatue and low pressure
Low temperatue and high pressure

SOLUTION :High TEMPERATURE and low pressure.
Discussion
12904.

Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine ?

Answer»

`H_(2)" (EXCESS)"//Pt`
`LiAlH_(4)` in ether
Fe and HCl
Sn and HCl

Answer :B
Discussion
12905.

The weight of 50% (wt/wt) solution of HCl required to react with 100 g of CaCO_3 would be :

Answer»

73 g
100 g
146 g
200 g

Answer :C
Discussion
12906.

Which among the following is true for amorphous solids?

Answer»

They are super cooled solids 
The GRAPH of temperature `to` time obtained on cooling after HEATING is curvature. 
Melting points are SHARP. 
REFRACTIVE index is different in all directions. 

Answer :B
Discussion
12907.

Which of the following react with benzoic acid to form ethyl benzoate

Answer»

Ethyl ALCOHOL
Cinnamic acid
Sodium ethoxide
Ethyl chloride

Solution :When BENZOIC acid reacts with ethyl alcohol in the presence of sulphuric acid ethyl benzoate is FORMED. This is known as esterfication.
`UNDERSET("BENZOICACID")(C_(6)H_(5)COOH)+underset("Ethylalcohol")(C_(2)H_(5)OH)overset(H_(2)SO_(4))to underset("Ethyl benzoate ")(C_(6)H_(5)COOC_(2)H_(5))+ underset("Water")(H_(2)O)`
Discussion
12908.

Which of the following is coloured ?

Answer»

`PbCl_(2)`
`PbI_(2)`
`AGCL`
`AgI`

ANSWER :B,D
Discussion
12909.

Which one of the following is formed as a product when Benzoic anhydride is hydrolysed?

Answer»

BENZOIN
BENZOIC ACID
BENZYL ALCOHOL
Benzaldehyde

Solution :Benzoic acid
Discussion
12910.

Which mixture is used for respiration by deep sea divers?

Answer»

`O_(2) + He`
`O_(2) + XE`
`O_(2) + AR`
`O_(2) + N_(2)`

ANSWER :A
Discussion
12911.

What is the product when vapour of ethyl alcohol is passed over Al_(2)O_(3) at 623K temperature ?

Answer»

ETHANE 1, 2 diol
ETHENE
Ethanoic acid
Ethyl METHYL ether

Solution :Ethene
Discussion
12912.

The standard enthalpy of combustion at 25^(@)C of hydrogen, cyclohexene (C_(6)H_(10)) and cyclohexane (C_(6)H_(12)) are -241, -3800 and -3920 kJ/ "mole" respectively. Calculate the heat of hydrogenation of cyclohexene.

Answer»

Solution :Given that,
(i) `H_(2)(g)+(1)/(2)O_(2)(g) to H_(2)O(l),DELTAH=-241 "kJ"`
(ii) `C_(6)H_(10)(g)+8(1)/(2)O_(2)(g) to 6CO_(2)(g)+5H_(2)O(l),DeltaH=-3800 "kJ"`
(iii) `C_(6)H_(12)(g)+9O_(2)(g) to 6CO_(2)(g)+6H_(2)O(l),DeltaH=-3920"kJ"`
We have to calculate `DeltaH` of the reaction,
`C_(6)H_(10)(g)+H_(2)(g) to C_(6)H_(12)(g),DeltaH=?`
Applying the INSPECTION method, i.e.,
Eqn.(i)+Eqn.(ii)-Eqn.(iii), we get,
`H_(2)(g)+(1)/(2)O_(2)(g)+C_(6)H_(10)(g)+8(1)/(2)O_(2)(g)-C_(6)H_(12)(g)-9O_(2)(g) to H_(2)O(l)+6CO_(2)(g)+5H_(2)O(l)-6CO_(2)(g)-6H_(2)O(l),DeltaH=-241+(-3800)-(-3920)`
or `C_(6)H_(10)(g)+H_(2)(g) to C_(6)H_(12)(g),DeltaH=-121 "kJ"`
Discussion
12913.

Which of the following is chain growth polymer

Answer»

TEFLON
Nylon-66
Nylon-6
terylene

Answer :A
Discussion
12914.

When acetic acid is dissolved in benzene its molecular mass:

Answer»

DECREASES
Increases
Either decreases or increases
Suffers no change.

Answer :B
Discussion
12915.

What is Schotten-Baumann reaction ?

Answer»

Solution :PHENOL reacts with benzoyl chloride in the presence of SODIUM hydroxide to form phenul benzoate .
`C_6 H_5 OH + C_6 H_5 COCl OVERSET(NaOH)to C_6 H_5 OCO C_6 H_5 + HCL`
This reaction is known as Schotten-Baumann reaction.
Discussion
12916.

Which metal is chiefly used in galvanising Fe?

Answer»

Cr
Zn
Cd
Sn

Answer :D
Discussion
12917.

Which of the following chemical can act as non-classical ligand(s) ?

Answer»

CO
`C_(2)H_(4)`
`NO^(+)`
`PR_(3)`

SOLUTION :Non-classical ligand not only donate the lone pair of electron to central metal but also accept the electron cloud from central ATOM.
Discussion
12918.

Write the nernst equation and the e.m.f. of the following cells at 298K: (i) Mg(s)|Mg^(2+)(0.001M)||Cu^(2+)(0.0001M)|Cu(s) (ii) Fe(s)|Fe^(2+)(0.001M)||H^(+)(1M)|H_(2)(g)(1" bar")|Pt(s) (iii) Sn(s)|Sn^(2+)(0.050M)||H^(+)(0.020M)|H_(2)(g)(1" bar")|Pt(s) (iv) Pt(s)|Br_(2)(l)|Br^(-)(0.010M)|H^(+)(0.030M)|H_(2)(g)(1" bar")|Pt(s) Given E_(Mg^(2+)//Mg)^(@)=-2.37V,E_(Cu^(2+)//Cu)^(@)=+0.34V,E_(Fe^(2+),Fe)^(@)=-0.44V E_(Sn^(2+)//Sn)^(@)=-0.14V,E_(1//2Br_(2),Br^(-))^(@)=+1.08V.

Answer»

SOLUTION :(i) Cell reaction: `Mg+Cu^(2+)toMg^(2+)+Cu(n=2)` <BR> nernst eqn.: `E_(cell)=E_(cell)^(@)-(0.0591)/(2)"LOG"([Mg^(2+)])/([Cu^(2+)])`
`E_(cell)=0.34-(-2.37)-(0.0591)/(2)"log"(10^(-3))/(10^(-4))=2.71-0.02955=2.68V`
(ii) Cell reaction: `Fe+2H^(+)toFe^(2+)+H_(2)(n=2)`
Nernst eqn.: `E_(cell)=E_(cell)^(@)-(0.0591)/(2)"log"([Fe^(2+)])/([H^(+)]^(2))`
`thereforeE_(cell)=0-(-0.44)-(0.0591)/(2)"log"(10^(-3))/((1)^(2))=0.44-(0.0591)/(2)xx(-3)=0.44+0.0887=0.523V`.
(iii) Cell reaction: `Sn+2H^(+)toSn^(2+)+H_(2)(n=2)`
Nernst eqn. : `E_(cell)=E_(cell)^(@)-(0.0591)/(2)"log"([Sn^(2+)])/([H^(+)]^(2))=0-(-0.14)-(0.591)/(2)"log"(0.05)/((0.02)^(2))`
`=0.14-(0.0591)/(2)log125=0.14-(0.0591)/(2)(2.0969)=0.078V`
(iv) Cell reaction: `2Br^(-)+2H^(+)toBr_(2)+H_(2)` (Note carefully) ltrgt Nernst eqn. : `E_(cell)=E_(cell)^(@)-(0.0591)/(2)"log"(1)/([Br^(-)]^(2)[H^(+)]^(2))`
`therefoerE_(cell)=(0-1.08)-(0.0591)/(2)"log"(1)/((0.01)^(2)(0.03)^(2))`
`=-1.08-(0.0591)/(2)log(1.111xx10^(7))=-1.08-(0.0591)/(2)(7.0457)=-1.08-0.208=-1.288V`
Thus, oxidation will OCCURS at the HYDROGEN electrode and reduction on the `Br_(2)` electrode. `E_(cell)=1.288V`.
Discussion
12919.

Which compund is deliquescent ?

Answer»

`Hg_2Cl_2`
`HgCl_2`
`ZnCl_2`
`CdCl_2`

SOLUTION :`ZnCl_2`
Discussion
12920.

Which of the following compounds will give negative Lassaigne is test for Nitrogen?

Answer»




ANSWER :B
Discussion
12921.

Write one chemical reaction each to illustrate the following : (i) Williamson.s synthesis (ii) Reimer - Tiemann reaction

Answer»

SOLUTION :(i) Williamson.s SYNTHESIS :

(II) REIMER - Teimann REACTION :
Discussion
12922.

What happens when freshly precipitated ferric hydroxide is treated with dilute ferric chloride

Answer»
Discussion
12923.

What is tincture iodine ? What its use ?

Answer»

Solution :2 to `3%` solution of IODINE dissolve SALTS of long chain benzene sulphonic ACID and long chain alkyl HYDROGEN sulphate.
Discussion
12924.

Which of following statement is not correct ?

Answer»

Only `ALPHA` - amino acids are OBTAINED on HYDROLYSIS of PROTEINS
The amino acids which are synthesised in the body are known as non - essential amino acids
There are 20 essential amino acids
L - amino acids are represented by writing the -`HN_2` group on the left side

Answer :C
Discussion
12925.

Unidentate ligands containing more than one coordinating atoms are called ……. Ligands.

Answer»

SOLUTION :AMBIDENTATE
Discussion
12926.

Which of the following can not be explained on the basis of polarisation :-

Answer»

`Ag_(2)S` is MUCH less soluble than `Ag_(2)O`
`BeCO_(3)` is thermally less STABLE than `BaCO_(3)`
`BaCO_(3)`is less soluble than `MgCO_(3)`
MELTING POINT of `AlCl_(3)` is much less than that of NaCl.

Solution :Solubility of ionic COMPOUND depends upon L.E. or hydration energy and not explain by polarisation.
Discussion
12927.

Which is strongest oxidising agent ?

Answer»

`Cl_2`
`F_2`
`O_3`
`O_2`

ANSWER :B
Discussion
12928.

Which is/are the correct method for separating a mixture of benzoic acid, p-methylanline & phenol.

Answer»

`OVERSET(aq.NaHCO_3)tooverset(aq.NaOH)to`
`overset(aq.HCl)tooverset(aq.NaHCO_3)to`
`overset(aq.NaOH)tooverset(aq.NaHCO_3)to`
`overset(aq.NaOH)tooverset(aq.HCl)to`

SOLUTION :
Discussion
12929.

Which of the following metal is obtained by self reduction method?

Answer»

Fe
Cu
Ag
Mg

Answer :B
Discussion
12930.

Volume occupiedby singleCsClionpairin acrystalis 7.014 xx10^(-23) cm^(3). ThesmallestCs-Csinternucleardistanceis equal to lengthof thesideof thecubecorrespondingtoVolumeof oneCsClionpair, thesmallestCsto Csinternucleardistanceisnearly________.

Answer»

`4.4Å`
`4.3Å`
`4Å`
`4.5Å`

ANSWER :C
Discussion
12931.

Which is used in the manufacture of thermosoftening plastic perspex?

Answer»

Acetaldehyde
Formaldehyde
ACETONE
Acetophenone

SOLUTION :Acetone
Discussion
12932.

Which of the following alcohols give ketone on oxidation ?

Answer»

Propan-2-ol
Propan-1-ol
2-Methyl propan-1-ol
Butan-1-ol

Solution :Propan-2-ol
Discussion
12933.

The solubility of A_(2)X_(3) is y mol dm^(-3). Its solubility product is

Answer»

`6 y^(4)`
`64 y^(4)`
`36 y^(5)`
`108 y^(5)`

SOLUTION :`{:(A_(2)X_(3)hArr,2A^(3+)+,3X^(2-),,K_(SP) = [A^(3+)][X^(2-)] = (2y)^(2)(3y)^(3)),(,2y,3y,):}`
or `K_(sp) = 108 y^(5)`
Discussion
12934.

Which of the following will increase the voltage of the cell

Answer»

Increase in the concentration of`SN^(2+)` ions
Increase in the concentration of`Ag^(+)` ions
Increase in the SIZE of SILVER rod
None

Answer :B
Discussion
12935.

Which of the followingorganic compound will give white precipitate with AgNO_(3)

Answer»

`C_(6)H_(5)NH_(3)^(+)Cl^(-)`
`NACL`
`2,4,6`-trinitrochlorobenzene
Benzyl chloride

Solution :All those substance which can give `Cl^(-)` IONS will give white PPT. with `AgNO_(3)`.

`AgNO_(3) + Cl^(-) rarr AgCldarr + NO_(3)^(-)`
Choice (b) is CORRECT
`NaCl +AgNO_(3) rarr AgCldarrNaNO_(3)`
Choice (c ) is correct .
Discussion
12936.

Which statement is true in regard to a spontaneous redox reaction ?

Answer»

`E_(red)` is ALWAYS negative
`E_("CELL") ` is always positive
`E_("ox") ` is always positive
`E_(red)` is always positive

Answer :B
Discussion
12937.

Write the IUPAC names of the following coordination compounds: (a)[CoCl_2(en)_2]Cl, (b)[Ni(CO)_4], (c)[Pt(NH_3)_2Cl(NO_2)] , (d)[Cr(NH_3)_6][Co(CN)_6]

Answer»

SOLUTION : (a) Dichloridobis(ethane-1,2-diammine) cobalt(III) CHLORIDE, (b) TETRACARBONYLNICKEL(0),(C) Diamminechloridonitrito-N-platinum(II) and (d)Hexaamminechromium(III) hexacyanocobaltate(III)
Discussion
12938.

Which of the following regarding basic nature of amine is correct

Answer»



`(CH_(3)CO_(2))_(2)NH gt (CH_(3)CH_(2))_(3)N`
`(CH_(3))_(2)NH gt CH_(3)NH_(2)`

SOLUTION :Resanance stabilisation and inductive EFFECT factors
Discussion
12939.

Which of the following does not contain a symmetrical structure ?

Answer»

`H_(2)S_(2)O_(4)`
`H_(2)S_(2)O_(5)`
`H_(2)S_(2)O_(7)`
`H_(2)S_(2)O_(6)`

Answer :B
Discussion
12940.

Which of the following complexes formed by Cu^(2+) ions most stable ?

Answer»

`Cu^(2)+4NH_(3)hArr[Cu(NH_(3))_(4)]^(2+), LOG K=11.6`
`Cu^(2)+4CN^(-)hArr[Cu(CN)_(4)]^(2-), log K=27.3`
`Cu^(2)+2enhArr[Cu(en)_(2)]^(2+), log K=15.4`
`Cu^(2)+4H_(2)OhArr[Cu(H_(2)O)_(4)]^(2+), log K=8.9`

Answer :B
Discussion
12941.

What are cross linked (or network) polymers:? Give example.

Answer»

SOLUTION :CROSS linked polymers (or) network polymers: These are usually formed from bi FUNCTIONAL and TRI functional monomersand contain strong covalent bonds between various LINEAR polymer chains.E.g.:Bakelite,melamine etc.
Discussion
12942.

Which of the following cannot reduce Tollens' reagent?

Answer»

HCOOH
HCHO
`CH_(3)CHO`
`CH_(3)COCH_(3)`

ANSWER :D
Discussion
12943.

What are biodegradable and non-biodegradable detergents? Give one example of each class.

Answer»

SOLUTION :Detergents having straight hydrocarbon chains are easily degraded (or decomposed) by MICROORGANISM and hence are called biodegradable detergents while detergents CONTAINING branched hydrocarbon chains are not easily degraded by the microorganisms and hence are called NON biodegradable detergents. Consequently, non-biodegradable detergents accumulate in rivers and other waterways THEREBY causing severe water pollution. Examples of biodegradable detergents are sodium lauryl sulphate, sodium 4-(1-dodecyl)benzene sulfonate and sodium 4-(2-dodecyl)benzene sulfonate. An example of non-biodegradable detergent is sodium 4-(1, 3, 5, 7-tetramethyl) octylbenzene sulfonate.
Discussion
12944.

Vortex rings in air are formed by:

Answer»

`PH_3`
`NH_3`
`SbH_3`
`AsH_3`

ANSWER :A
Discussion
12945.

Which of the following compounds will react with alcoholic KNC ?

Answer»

ETHYL chloride
Acetyl chloride
Benzaldeyde
Chlorobenzene.

Solution :
Discussion
12946.

What does 'A' represent in Arrhenius equation giving the change of reaction velocity with change of temperature?

Answer»

SOLUTION :FREQUENCY FACTOR
Discussion
12947.

What are elastomers ? Give one example.

Answer»

Solution :Polymers in which the intermolecular forces of ATTRACTION between the POLYMER chains are the WEAKEST are called elastomers. For EXAMPLE , natural rubber or vulcanized rubber.
Discussion
12948.

Which of the following reactions are both sterospecific and steroselective ?

Answer»

`SN^(1)`
`SN^(2)`
`E1`
`E2`

Solution :`SN^(2)` and `E2` are both sterospecific because theattack from the back by `Nu^(o-)` in `SN^(2)` and attack by base `E2`(at `beta-H` atom) are SPECIFIC. Both of them FORM exvulsively only one product.
Discussion
12949.

Which of the following alloys does not contain copper ?

Answer»

DELTA metal
German SILVER
Solder
Phosphorus bronze.

Answer :C
Discussion
12950.

What are n-type semiconductors ?

Answer»

Solution :n-type SEMICONDUCTORS are those substances which having impurity with EXTRA ELECTRONS. Example : When Silicon doped with group-`15^(th)` ELEMENT, n-type SEMICONDUCTOR is obtained.
Discussion