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1801.

Which ore is used for the manufacture of iron ?

Answer»

Cryolite
Bauxite
Haematite
Chalcopyrites

Answer :C
Discussion
1802.

Total number of isomeric aldehydes and ketones having the molecular formula C_(5)H_(10)O are

Answer»


Solution :Isomers are possible. These are:
ALDEHYDES: `CH_(3)CH_(2)CH_(2)CH_(2)CHO, CH_(3)CH_(2)CH_(2)(CH_(3))CHO, (CH_(3))_(2)CHCH_(2)CHO, (CH_(3))_(3)C CHO`.
KETONES: `CH_(3)COCH_(2)CH_(2)CH_(3), CH_(3)COCH(CH_(3))_(2), CH_(3)CH_(2)COCH_(2)CH_(3)`.
Discussion
1803.

Which of the following intermediates in Sandmeyer's reaction ?

Answer»

`C_(6)H_(5)-overset(o+)N-=N`
`overset(cdot)(C_(6))H_(5)` (Phenyl RADICAL)
`C_(6)H_(5)Cl`
`C_(6)H_(5)overset(+)(N)-=NCl^(-)`

SOLUTION :Mechanism sandmayer
Discussion
1804.

Which element reacts with chlorine to give pentachloride ?

Answer»

P
As
Sb
All

Answer :D
Discussion
1805.

Thermal stability of polyhalides are

Answer»

 `NA^(+) LTK^(+)ltNH_(4)^(+)ltRb^(+)`
`Na^(+)ltNH_(4)^(+) ltk^(+)ltRb^(+)`
 `K^(+)ltNH_(4)^(+)ltNa^(+)ltRb^(+)`
`Rblt Na^(+)ltK^(+)ltNH_(4)^(-)`

ANSWER :A
Discussion
1806.

Which one is more acidic in aqueous solution

Answer»

`NiCl_(2)`
`FeCl_(3)`
`AlCl_(3)`
`BeCl_(2)`

Solution :Some SALTS of weak BASE and STRONG acid get hydrolysed in aqueous solution thus FORMING an acidic solution.
`underset(("acidic"))(AlCl_(3))+3H_(2)Oto Al(OH)_(3)+3HCl`
Discussion
1807.

Which one is the strongest electrolyte in the following

Answer»

NACL
`CH_(3)COOH`
`NH_(4)OH`
`C_(6)H_(12)O_(6)`

SOLUTION :NaCl, being a salt, is a STRONG electrolyte.
Discussion
1808.

Write the IUPAC names of (i) CH_(3)OCH_(2)CH_(2)OH (ii) CH_(3)OCH_(2)OCH_(3) and (iii)

Answer»

Solution :(i) 2-methoxy ETHANOL , (ii) dimethoxy METHANE and (iii) PHENYL methanol
Discussion
1809.

When a nucleophile attach te carbonyl group of a carboxylic acid deriative, the carbon-oxygen pi- bond breaks. The resulting intermediate is called a tetrahedral inntermediuate because sp^(2) carbon in the reactant has become a tetrahedral (sp^(3)) carbon in the intermediate. Here overset(..)Y^(ɵ) is leaving gourp, the weaker base is expelled preferentially. Q. Which of the following given compounds dot't form amide, when react with CH_(3)COCl. (1). CH_(3)-NH-CH_(3) (2). CH_(3)-underset(CH_(3))underset(|)N-CH_(2)H_(5) (3). (4). CH_(3)-CH_(2)-CH_(2)-NH_(2)

Answer»

(1 and 4)
only (4)
(2 and 3)
only (1)

SOLUTION :TERTIARY amine and PYRIDINE doesn't from amides when react with `CH_(3)-underset(O)underset(||)C-Cl`
Discussion
1810.

When a nucleophile attach te carbonyl group of a carboxylic acid deriative, the carbon-oxygen pi- bond breaks. The resulting intermediate is called a tetrahedral inntermediuate because sp^(2) carbon in the reactant has become a tetrahedral (sp^(3)) carbon in the intermediate. Here overset(..)Y^(ɵ) is leaving gourp, the weaker base is expelled preferentially. Q. Consider the following reaction: CH_(3)-underset(O^(18))underset(||)C-overset(18)C^(ɵ) (2). CH_(3)-underset(O)underset(||)C-C^(ɵ) (3). CH_(3)CH_(2)OH (4). CH_(3)CH_(2)overset(18)(O)H

Answer»

(1 and 4)
only (2)
(1 and 3)
only (4)

SOLUTION :
Discussion
1811.

Which oxide is weakly basic and at the same time a powerful oxidising agent ?

Answer»

`SiO_(2)`
`PbO_(2)`
`CO_(2)`
`SnO_(2)`

Solution :`PbO_(2)` is oxidant as well as base.
Discussion
1812.

Arrange the following in increasing order of their vapour pressure at room temperature. (Water, salt solution in water, alcohol – water solution)

Answer»

SOLUTION :V.P.of SUGER solution in WATER < V.P. of water < V.P. of alcohol-water solution .
Discussion
1813.

Which is the lightest radioactive element?

Answer»

SOLUTION :HYDROGEN
Discussion
1814.

Which other substance than oxygen is formed when KClO_3, is heated ?

Answer»

SOLUTION :POTASSIUM CHLORIDE
Discussion
1815.

Whatare lyophobic colloids? Give one example for them.

Answer»

Solution :Lyophobic COLLOIDS are the colloidal solutions in which the particles of the dispersed phase have no affinity for thedispersion medium. The solid OBTAINED by their PRECIPITATION cannot be reconverted into colloidal solution by simply shaking it with the DISPERSION medium. Colloidal solutions of gold, SILVER, `Fe(OH)_3 `and `As_2S_3` are lyophobic.
Discussion
1816.

To which orbit k, the electron in the hydrogen atom will jump on absorbing 12.1 eV ofenergy ?

Answer»

`2^("rd")` ORBIT
`3^("rd")` orbit
`4^("th")`orbit
`5^("th")` orbit

SOLUTION :ENERGY of electron in the `n^th`orbitof H-atom , is
` E_(n) - 13.6/n^(2) eV`
` therefore E_(1) = -13.6 eV"" (as n = 1) `
After aborbing12.1eV,the energywill be
` - 13.6eV+ 12.1 eV = - 1.5 eV `
THUS ` - 13.6/2= -1.5 eVRightarrown^(2) = 9 or n =3 `
Thuselectron will jump to `3^(rd)` orbit
Discussion
1817.

Which of the following is non a use of Lanthanoides

Answer»

Misch metal is an alloy of Lanthanoid metal USED to produce BULLETS, shells
OXIDES of Lanthanoids can be used a catalysts in petroleum cracking
Oxides of some Lanthanoids are used as phosphors in television screens
All Lanthanoids are good OXIDISING agents in +3 state

Solution :Ce stableis `= 4 rArrCe^(+3)` act as R.A
Discussion
1818.

Which one of the following is not a chemical change?

Answer»

SUBLIMATION
Combustion
Electrolysis
RUSTING

ANSWER :A::B::C
Discussion
1819.

Which of the following is true about the complex [PtCl_(2)(H_(2)O)(NH_(3))]?

Answer»

It EXHIBITS geomettrical isomerism
It is paramagnetic COMPLEX
its GEOMETRY is tetrahedron
platinum is `sp^(3)` hybridised

Solution :`[PtCl_(2)(NH_(3))(OH)_(2)]`: Pt-oxidation state +2 ,
Valence CONFIGURATION`=5d^(8)`
Complex is diamagnetic and exhibits geometrical isomerism.
Discussion
1820.

Which of the following IUPAC names are correct.

Answer»




SOLUTION :N//A
Discussion
1821.

Which of the following statements are correct about halr-period ?

Answer»

It is proportional to intial concentration for zeroth order
AVERAGE life `=1.44xx` half-life for first order REACTION.
Tiem of `75%` comletion of reaction is thrice of halr-life (intial harl-life) period in second order reaction
`99.9%` reaction TAKES PLACE in `100` MINUTES for the case when reate constant is `0.693 min^(-1)`

Answer :A::B::C::D
Discussion
1822.

Which of the following graphs is correct for a first order reaction -

Answer»




ANSWER :A::D
Discussion
1823.

When acetaldehyde is heated with Fehling.s solution it gives a red precipitate :

Answer»

CU
CUO
`Cu + Cu_2O + CuO`
`Cu_2O`

ANSWER :D
Discussion
1824.

Which of the following can be remelted time and again without producing any change :

Answer»

THERMOSETTING polymers
Thermoplastic polymers
Bakelite
Malamine

Answer :B
Discussion
1825.

When is reduced with Sn/HCl the pair of compounds formed are…….

Answer»

ETHANOL, hydrozylamine hydrochloride
Ethanol, AMMONIUM hydroxide
Ethanol `NH_(2)OH`
`C_(3)H_(5)NH_(2),H_(2)O`

Answer :A
Discussion
1826.

Which of the following compound does not belongs to liquids ?

Answer»

Fats
Ethanol
ETHANOIC ACID
Oils

Answer :A
Discussion
1827.

Which alkaline earth metal formscomplex salts?

Answer»

Be
Mg
Ca
Ba

Answer :A
Discussion
1828.

Which of the following statements regarding the manufacture of H_(2)SO_(4) by contact process is not true.

Answer»

Sulphur is burnt in air to FORM `SO_(2)`
`SO_(2)` is catalytically oxidised to `SO_(3)`
`SO_(3)` is dissolved in water to get 100% sulphuric acid
`H_(2)SO_(4)` obtained by contact process is of HIGHER purity than obtained by lead chamber process.

Answer :C
Discussion
1829.

The solubility of Mg_3 (PO_4)_2 is S mol L^(-1) The solubility product is given by the relation

Answer»

`s^5`
`36 s^5`
`6 s^5`
`108 s^5`

Solution :`{:(Mg_3 (PO_4) _2,hArr, 3Mg^(2+), +2PO_(4)^(3-)),(S,,3S,2S):}`
`k_(sp) = (3s)^3(2s)^2= 108s^5`
Discussion
1830.

Veronal, luminal and seconal are _______derivatives

Answer»


ANSWER :BARBITURIC ACID
Discussion
1831.

Which of the following is ferromagnetic

Answer»

NI
CO
`cro_(2)`
all

ANSWER :D
Discussion
1832.

Whichof the following is correct ?

Answer»

VOLUME of `8g O_(2)` (s) is equal to 2g of `H_(2)` (G) at STP
Volume of `1.5` mole of `O_(3)` is equal to `0.5` ml of `SO_(2)` (g) at STP
Volume of `1.5` mole of `O_(3)` is equal to 2g of `H_(2)` (g) at STP
None of these

Solution :N/A
Discussion
1833.

What are ligands? Give example.

Answer»

Solution :The ligands are the atoms or groups of atoms BOUND to the central metal ATOM / ion. The atom in a LIGAND that is bound directly to the central metal atom is KNOWN as donor atom.
For e.g, In `K_(4)[Fe(CN)_(6)]` the ligand is `CN^(-)` ion but the donor atom is carbon.
Discussion
1834.

Which metal corrodes readily in moist air ?

Answer»

Gold
Silver
Nickel
Iron

Answer :D
Discussion
1835.

Which set of conditions represents easiest way to liquify a gas :

Answer»

LOW TEMPERATURE and HIGH PRESSURE
High temperature and low pressure
Low temperature and low pressure
High temperature and high pressure

Answer :A
Discussion
1836.

Which of the following when treated with superheated steam under pressure gives benzene?

Answer»

benzenesulphonic ACID
benzyl chloride
bromobenzene
nitrobenzene.

Solution :Sulphonation unlike NITRATION and halogenation is a reversible reaction and hence in PRESENCE of superheated steam, benzenesulphonic acid undergoes desulphonation to give benzene.
Discussion
1837.

The sources of most of the noble gases is:

Answer»

DECAY of radioactive minerals
The ATMOSPHERIC air
The mnatural gases COMING out of the earth
The decay of rocks

Answer :B
Discussion
1838.

Which of the following is TRUE for hydrolysis of an optically active tertiary halide ?

Answer»

It is unimolecular as the overall reaction INVOLVES ONE molecules.
The product has 100% inversion of configuration
Reaction involves two steps, because ORDER of reaction is one.
Formationof `sp^(2)` carbon is slowest step.

Answer :D
Discussion
1839.

When an exothermic is reversed, it:

Answer»

BECOMES ANOTHER exothermic reaction
Becomes an endothermic reaction
Shows no change at all
Attains equilibrium

Answer :B
Discussion
1840.

What type of isomerism is shown by the complex [Cr(H_(2)O)_(6)]Cl_(3) ?

Answer»

SOLUTION :`[CR(H_(2)O)_(6)]Cl_(3)` shows hydrate isomerism.
Its hydrate isomer is `[Cr(H_(2)O)_(5)Cl]Cl_(2).H_(2)O`
Discussion
1841.

Which of the following alkyl halide will undergo S_(N)1 reaction most readily?

Answer»

`(CH_(3))_(3)C-F`
`(CH_(3))_(3)C-Cl`
`(CH_(3))_(3)C-Br`
`(CH_(3))_(3)C-I`

Solution :Amongst alkyl halides, C-I bond is the WEAKEST and HENCE `(CH_(3))_(3)C-I` UNDERGOES `S_(N)1` REACTION most readily.
Discussion
1842.

What is the relationship between opan chain forms of D-glucose and D-altrose?

Answer»

enantiomers
constitutional ISOMERS
diastereomers
different CONFORMATIONS of the same compounds

Solution :Contitutional isomers
ALTROSE is
Discussion
1843.

Water gas is produced by the action of superheated steam on red hot coke.C(s) + H_2O(g) + 131.4 kcal = underset("water gas")(CO(g) + H_2(g))Delta H_ffor H_2O(g) = -241.8 kJ "mole"^(-1) . Calculate Delta H_f for CO(g)

Answer»

SOLUTION :`-110.4 KJ`
Discussion
1844.

Which type of drugs come under antimicrobial drugs?

Answer»

Solution :Diseases in human beings and animals may be caused by a VARIETY of micro-organisms such as BACTERIA, fungi and other pathogens. An antimicrobial tends to destroy/prevent development or INHIBIT the pathogenic action of microbes such as bacteria (antibacterial drugs), fungi (Antifungal agents), virus (antiviral agents) or other parasites (antiparasitic drugs) selectively. ANTIBIOTICS, ANTISEPTICS and disinfectants are antimicrobial drugs.
Discussion
1845.

Give the values of gas constant is different units.

Answer»

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

Answer :C
Discussion
1846.

Which of the following yield both alkane and alkene

Answer»

KOLBE's reaction
Williamson's synthesis
Wurtz reaction
Sandmeyer reaction

Solution :Kolbe's method: Electrolysis of a CONCENTRATED aqueous solution of either sodium or potassium SALTS of carboxylic acids YIELDS alkanes/alkenes at anode
`CH_3COONa hArr CH_3COO^(-) + Na^(+)`n
Anode : `2CH_3COO^(-) overset(-2e^(-))to CH_3-CH_3+2CO_2`
Cathode :`2Na^(+)+2e^(-) to 2Na, 2Na+2H_2O to 2NAOH +H_2`
Discussion
1847.

Which of the following is not true is case ofreaction with heated copper at 300^(@)C

Answer»

PHENOL `to` BENZYL ALCOHOL
Primary alcohol `to` Aldehyde
Secondary alcohol `to `Ketone
Tertiary alcohol `to `Olefin

Answer :A
Discussion
1848.

Whichone of thefollowingis wronglymatched?

Answer»

saponificationof ` CH_(3)COOC_(2)H_(5)`- secondorderreaction
Hydrolysisof `CH_(3)COOCH_(3)` - pseudounimolecularreaction
Decompostionof `H_(2)O_(2) `- firstorderreaction
Combinationof `H_(2)andBr_(2) `togiveHBr- ZEROORDERREACTION

SOLUTION :Combinationof `H_(2)andBr_(2)`to giveHBrfollowsecondorderkineticsas itsreactionrateisdeterminedby thevariationoftwoconcentrationterms .
Discussion
1849.

What is the actual volumeoccupiedby watermoleculespresentin 20 cm^(3)of water ?

Answer»

`20 cm^(3)`
`10 cm^(3)`
`40 cm^(3)`
`24.89 cm^(3)`

Solution :Half of THEVOLUME occupiedin WATER is empty or unoccpied. Therefore,`10 cm^(3)`of the actualvolume isoccupiedby water moleculespresentin `20 cm^(3)` of water.
Discussion
1850.

Which compound is prepared by the following reaction ? underset"(2:1 volume ratio)"(Xe + F_2 ) underset"673 K"overset"Ni"to

Answer»

`XeF_4`
`XeF_2`
`XeF_6`
`XeF_2` and `XeF_6`

Solution :`XE + 2F_2 UNDERSET"673 K"overset(NI)to XeF_4`
Discussion