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1851.

Which of the following elements does not form stable diatomic molecules

Answer»

IODINE
Phosphorus
Nitrogen
Oxygen

ANSWER :B
Discussion
1852.

The standard reduction potential for Cu^(2+)//Cu is +0.34 V. Calculate the reduction potential at pH=14 for the above couple. K_(sp) of Cu(OH)_(2) is 1.0xx10^(-19).

Answer»


ANSWER :`-0.22 V`
Discussion
1853.

Whichseries ofreactions correctlyrepresents chemicalreactionsrelatedto ironanditscompound ?

Answer»

`Fe overset (O_2, "heat ") toFe _ 3 O _ 4overset (CO,600^(@)C) toFeOoverset (CO, 700^(@)C) toFe `
`Feoverset ("dil." H_2SO_4) to FeSO_4 overset (H_2SO_4, O_2) to Fe _2 (SO_4)_ 3`
` Fe overset (O_2,"heat")to FeOoverset ("dil." H_2SO_4) toFeSO_ 4overset ("heat") to Fe`
`Fe overset (Cl_2, "heat")toFeCl_3 overset ("heat, AIR ") to FeCl_2 overset (Zn) toFe` .

Solution :Option(a) iscorrectsinceFe onheatingwith` O _ 2`GIVES` Fe_ 3O _4`which uponreduction with COfirst givesFeOandfinallyFe. All otheroptionsarewrongasexplained below:
Option(b) and(c )arewrongbecause` FeSO_4 `onheatinggives ` Fe_ 2 O_ 3 , SO_ 2and SO_ 3`andnot Fe.
`2 FeSO _ 4overset (DELTA ) toFe _ 2 O_3+SO_3+ SO_2`
Option(d) iswrongbecausein presenceofair,reductionof` FeCl_ 3`to` FECL _2`cannotoccur.
Discussion
1854.

When copper plate is kept in 0.1 M solution of CuSO_(4) at 298K temperature and if 70% dissociation is occurred then calculate the potential of copper electrode.

Answer»

Solution :REACTION : `Cu^(2+)+2E^(-) to Cu_((S))`
CONCENTRATION of `Cu^(2+)`=molarity`xx`percentage of dissociation
`therefore [Cu^(2+)]=0.1xx(70)/(100)=0.07M`
As per Nernst EQUATION, where, `E_(Cu^(2+)|Cu)^(Theta)=+0.34V`
`E_(cell)=E_(cell)^(Theta)-(0.059)/(n)"log"([Cu_((S))])/([Cu^(2+)])""n=2`
`=0.34-(0.059)/(2)"log"(1)/(0.07)`
`=0.34-(0.059)/(2)"log"(1)/(0.07)`
`0.34-(0.0295)log(14.286)`
`=0.34-(0.03407)=0.3059V`
If dissociation is less than 100% then `[Cu^(2+)]` and potential both decreases.
Discussion
1855.

Those simple organic molecules which chemically combine with one another and form a polymer, is called ………………

Answer»

MONOMER
TETRAMER
DIMER
TRIMER

SOLUTION :monomer
Discussion
1856.

Write the chemical reaction of a carboxylic acid with: (a) Na_(2)CO_(3) (b) PCl_(5) (c) NH_(3).

Answer»

Solution :(a) `2RCOOH+Na_(2)CO_(3) to 2RCOONa+H_(2)O+CO_(2)`
(B) `RCOOH+PCl_(5) to RCOCl+POCl_(3)+HCl`
(c) `RCOOH+NH_(3) to RCOONH_(4)`.
Discussion
1857.

What isthe role of limstonein theextractionof ironfromitsoxides ?

Answer»

Solution :Eitherlimestone itself or CaO obtained by itsthermaldecomposition actsas abasicfluxin theextractionof ironfromitsoxides. Itremoves acidicimpurityof` SiO_2`presentin the oxide ore to form FUSIBLE calciumsilicate SLAG.
`UNDERSET ("Basic flux")(CaCO_3(s)) +underset ("ACIDIC IMPURITY")(SiO_2(s)) overset (1123K) to underset ("Cal.silicate")(CaSiO_3(slag)) + CO_2(g) `
Altrnatively,
`""CaCO_3(s) overset (1123K) toCaO(s) + CO_2(g) `
`""underset ("Basic flux")(CaO(s)) +underset ("Acidic impurity")(SiO_2(s)) overset (1123K)tounderset ("Cal.silicate")(CaSiO_3(slag)) `
Discussion
1858.

Which property of an element is not variable :

Answer»

Valence
AT. WT.
eq.wt.
None

Answer :B
Discussion
1859.

Which acid will not form hydrocarbon

Answer»

Cinnamic ACID
Isothallic acid
SALICYLIC acid
PICRIC acid

Solution :
Discussion
1860.

Which method is used to determine the molecular mass of polymer molecules like colloid?

Answer»

Depression in FREEZING point 
Osmotic pressure 
Decrease in VAPOUR pressure 
ELEVATION in boiling point 

Answer :B
Discussion
1861.

Which of the following halideso is most reactive towards nucleophilic substitution reaction?

Answer»

`C_(2)H_(5)BR`
`C_(2)H_(5)Cl`
`C_(2)H_(5)F`
`C_(2)H_(5)I`

Answer :D
Discussion
1862.

Which one of the following compounds is not formed?

Answer»

`XeOF_(4)`
`XeO_(3)`
`XeF_(2)`
`NeF_(2)`

SOLUTION :`NeF_(2)`
Discussion
1863.

Which of the following is used to prepare CI_(2) gas at room temperature from concentrated HCI?

Answer»

`MnO_(2)`
`H_(2)S`
`KMnO_(4)`
`Cr_(2)O_(3)`

Solution :`KMnO_4` oxidises halogen ACIDS to halogen.
`2K MnO_(4) + 3H_2SO_4 to K_2SO_4 + 2 MnSO_4 + 3H_2O + 5O`
`[2HCl + O to H_2O + Cl_2] xx 5`
`2KMnO_4 + 3H_2SO_4 + 10 HCl to K_2SO_4 + 2MnSO_4 + 8H_2O + 5Cl_2`.
`:. KMnO_4` is USED to prepare `Cl_2` from concentrated HCl.
Discussion
1864.

Which of the following would undergo dehydration most readily

Answer»

1-phenyl-1 butanol
2-phenyl-2 butanol
1-phenyl-2 butanol
2-phenyl-1-butanol

Answer :C
Discussion
1865.

Which one of the following can be classified as a Bronsted base

Answer»

`NO_(3)^(-)`
`H_(3)O^(+)`
`NH_(4)^(+)`
`CH_(3)COOH`

Solution :Those COMPOUND which accept `H^(+)` is called Bronsted BASE `NO_(3)^(-)` accept `H^(+)` and FORM `HNO_(3)`. So it is a base.
Discussion
1866.

When diethyl ether is treated with CI_(2) in the presence of dark. Then the product formed is

Answer»

`CH_3CCI_2-O-CH_2CH_3`
`CH_3CHCI-O-CHCICH_3`
`CCI_3CCI_2OCCI_2CCI_3`
`CH_2CCI_2-O-CHCICH_3`

SOLUTION :NA
Discussion
1867.

Which of the following reaction is used to make a fuel cell?

Answer»

`Cd_((s)) + 2NI(OH)_(3(s)) to CdO_((s)) + 2Ni (OH) + H_2O_((l))`
`Pb_((s)) + PbO_(2(s)) + 2H_2SO_(4(aq)) to 2PbSO_(4(s)) + 2H_2O_((l))`
`2Fe_((s)) + O_(2(g)) to 2H_2O_((l))`
`2Fe_((s)) + O_(2(g)) + 4H_((aq))^(+) to 2Fe_((aq))^(2+) + 2H_2O_((l))`

Answer :C
Discussion
1868.

The total number of carboxylic acid group in the product P is

Answer»


SOLUTION :
Discussion
1869.

Which mixed sulpate is not an alum ?

Answer»

`K_2SO_4. Al_2(SO_4)_3. 24H_2O`
`K_2SO_4 .Cr_2(SO_4)_3. 24H_2O`
`Na_2SO_4. Fe_2(SO_4)_3. 24H_2O`
`CuSO_4Al_2(SO_4)_3. 24H_2O`

ANSWER :D
Discussion
1870.

Which of the following molecuels has S-configuration?

Answer»




ANSWER :D
Discussion
1871.

What are fuel cells ? Write the electrode reactions of a fuel cell which uses the reaction of hydrogen with oxygen.

Answer»

Solution :Those cells in which DECIMAL energy of fuel is converted into electrical energy are called fuel cells.
ELECTRODE reactions
`{:("At anode", H_(2)(g) + 2OH^(-) (aq) to 2H_(2)O (L) + 2e^(-) xx 2),("At CATHODE", O_(2)(g) + 2H_(2)O(l) + 4e^(-) to 4OH^(-) (aq)),("Net cell reaction", 2H_(2) (g) + O_(2) (g) to 2H_(2)O(l)):}`
Discussion
1872.

Which of the followingon oxidation gives an acid containing two carbon atoms:

Answer»

Ethanol
Ethane nitrile
Ethanamide
Ethanamine

Answer :A
Discussion
1873.

Whty is it necessary to remove CO when ammonia is obtained by Haber process ?

Answer»


Answer :CO ACTS as a poison for the iron catalyst used in the manufacture of `NH_3` by Haber PROCESS. So it should be removed completely before ADMITTING the reactants to the catalyst CHAMBER.
Discussion
1874.

The volume of 0.1 M H_2SO_4 required to neutralise 30 ml of 2.0 M NaOH is :

Answer»

100ml
300ml
400 ML
200 ml

Answer :B
Discussion
1875.

Which amont the following is not a borane?

Answer»

`B_(2)H_(6)`
`B_(3)H_(6)`
`B_(4)H_(10)`
NONE of these

Solution :Nido borane: `B_(n)H_(4+n)`, aracno borane `B_(n)+H_(6+n), B_(3)H_(6)` is not a borane.
Discussion
1876.

Which of the statements regarding SN^2reaction is correct

Answer»

Overall order of REACTION is two
Molecularity of the reaction is two
Primary halides mainly UNDERGO `SN^2`reaction
All the above

Answer :D
Discussion
1877.

Which of the following oxides is netural

Answer»

CO
`SnO_(2)`
`ZNO`
`SiO_(2)`

SOLUTION :CO is an EXAMPLE of neutral OXIDE
Discussion
1878.

Which of the following is mond gas ?

Answer»

CO
NO
`I_2`
`NH_3`

ANSWER :A
Discussion
1879.

Assosiated colloids

Answer»

Which consist of aggregate of atoms and molecules with diameter less than 1 mm 
SUBSTANCES which behave like COLLOIDS only at higher concentration in solution 
Substances which behave like colloids only at lower TEMPERATURE 
All the above 

Solution :Associated colloids are formed by soap
Soap at low conc BEHAVES as TRUE soluton
Discussion
1880.

Trans-esterification means

Answer»

preparation of ESTER from ester
preparation of ester from ACID
preparation of ester from alcohol
REVERSE of esterificatino

ANSWER :A
Discussion
1881.

Which of the following option is correct for first order reaction?

Answer»

MOLECULARITY is zero
The ORDER of REACTION is zero
The order of reaction is one
None of the given

Answer :C
Discussion
1882.

The two compounds (I) and (II) are related as :

Answer»

ENANTIOMERS
Anomers
Diastereomers
IDENTICAL

Solution : , THEREFORE I and II are identical
Discussion
1883.

Which is more basic among aqueous solutions of aniline and ammonia ? Give one reason?

Answer»

SOLUTION :`-NH_(2)`, group is attached directly to the benzene ring & the unshared electron PAIR on nitrogen ATOM in conjugated with benzene ring.
Discussion
1884.

What happens when propanol-1 is oxidised ?

Answer»

SOLUTION :PROPIONALDEHYDE is FORMED.
Discussion
1885.

Which of the following ions form most stable complex compound

Answer»

`Cu^(++)`
`Ni^(++)`
`Fe^(++)`
`Mn^(++)`

SOLUTION :The MAGNITUDE of stability constants for some divalent metal ions of the first transition SERIES with oxygen or nitrogen DONAR ligands increases in the order.
`Mn^(2+)ltFe^(2+)ltCo^(2+)ltNi^(2+)ltCu^(2+)ltZn^(2+)`
Discussion
1886.

Three spheres of the first layer and three of the second layer enclosed a site at the centre in a closest packing arrangement this site is called

Answer»

INTERSTITIAL void
tetrahedral void
octahedral void
cubic void

Answer :C
Discussion
1887.

Which sta.tement is correct?

Answer»

Law of mass action and rate I.aw EXPRESSIONS re same for SINGLE step-reactions
Order of the slowest elementary reaction of a ~omplex reaction gives the order of 'the COMPLEX. reaction
Both order artq. molecularity have normally maximum value of 3
All

Solution :All are facts to be remembered.
Discussion
1888.

The reductionof whichof the followinggives1-propanamine ?

Answer»

`C_(3)H_(7)CN`
`C_(2)H_(5)CH = NOH`
`CH_(3)NO_(2)`
`CH_(3) - NH - CH_(3)`

Solution :`CH_(3) - CH_(2) - CH = NOH + 4(H) overset(Na+C_(2) H_(5) - OH)toCH_(3) - CH_(2) - CH_(2) - NH_(2) + H_(2)O`
Discussion
1889.

The role of conc. H_(2)SO_(4) in the esterification process is

Answer»

CATALYST
DEHYDRATING AGENT
Hydrolysing agent
Dehydrating agent & catalyst

Answer :D
Discussion
1890.

Waxused in gramophone records

Answer»

Paraffin WAX
Bees wax
Carnauba wax
NONE

Answer :C
Discussion
1891.

which is the first order reaction?

Answer»

`NH_4NO_2 to N_2+2H_2O`
`2Hl to H_2+l_2`
`2NO_2 to 2NO+O_2`
`2NO+O_2 to 2NO_2`

ANSWER :A
Discussion
1892.

Which methods are usually employed for purifying the following metals : Germanium.

Answer»

Solution :Germanium : Germanium is refined by zone REFINING.
Principle : The principle of the method is IMPURITIES are more SOLUBLE in the MELT than in the solid state of the metal.
Discussion
1893.

Which of the following cannot form a carbanion when treated with dil.NaOH?

Answer»

`CH_3CH_2CHO`
`(CH_3)_2CHCHO`
`C_6H_5CH_2CHO`
`CH_3 - UNDERSET(CH_3) underset(|)OVERSET(CH_3)overset(|)C-CHO`

ANSWER :D
Discussion
1894.

Which point defect in crystals does not alter the density of the relevant solid ?

Answer»

SOLUTION :FRENKEL DEFECT.
Discussion
1895.

Which reagent will you use for the following reactions? CH_(3)CH_(2)CH_(2)CH_(3) to CH_(3)CH_(2)CH_(2)CH_(2)Cl+CH_(3)CH_(2)CHClCH_(3)

Answer»

`Cl_(2)//UV` light
`NaCl+H_(2)SO_(4)`
`Cl_(2)` GAS in DARK
`Cl_(2)` gas in the PRESENCE of iron in dark

Answer :A
Discussion
1896.

Which of the following reactions does not take place during leaching for concentration of bauxite?

Answer»

`Al_(2)O_(3) + 2NaOH + 3H_(2)O to 2NA[Al(OH)_(4)]`
`2Na[Al(OH)_(4)]+CO_(2) to Al_(2)O_(3).xH_(2)O + 2NaHCO_(3)`
`Al_(2)O_(3)*2H_(2)O overset(Delta)to Al_(2)O_(3)+ 2H_(2)O`
`Al_(2)O_(3)*xH_(2)O overset(Delta)to Al_(2)O_(3)+ xH_(2)O`

Answer :C
Discussion
1897.

The shape of [HgI_(3)]^(-) is………… and the type of hybridisation is………… .

Answer»


ANSWER :TRIGONAL PLANAR,`SP^(2)`
Discussion
1898.

Write the chemicalnamesourceand deficientdiseaseof the following.(i) Vitamin D(ii) Vitamin E (iii) Vitamin K.

Answer»

SOLUTION :
Discussion
1899.

Which pair of compounds on heating give isomeric products

Answer»



`undersetunderset(HO)(|)CH_2-CH_2-CH_2-CO_2Hand CH_3-undersetunderset(CO_2H)(|)CH-CH_2-CH_2-OH`
All of above

Solution :
Discussion
1900.

Which acid forms zwitter ions:

Answer»

`CH_3COOH` and `C_2H_5OH`
SALICYLIC ACID
PHTHALIC acid
Sulphanilic acid

Answer :D
Discussion