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23751.

The unit cell of an element of atomic mass 108 u and density 10.5 g cm^(-3) is cube with edge length 409 pm. Find the type of unit cell of the crystal. (Given : Avogadro's constant = 6.023 xx 10^(23) mol)

Answer»

Solution :`d = (ZM)/(a^(3)N_(A))`
`Z = (d xx a^(3) xx N_(A))/(M)`
M = 108 u
d = 10.5 `cm^(3)`
a = 409 pm
`Z = (10.5 xx (409 xx 10^(-10))^(3) xx 6.023 xx 10^(23))/(108)`
`= 40056796 xx 10^(-7)`
= 4.0056796
In a FCC UNIT cell, there are four ATOMS per unit cell. So it is fcc.
Discussion
23752.

Which of the following is a hallucinogenic drug

Answer»

SECONAL
Calmpose
LSD
Methedrine

Answer :C
Discussion
23753.

Write the name, stereochemistry and magnetic behaviour of the following : [Co(NH_(3))_(5)Cl]O_(2)

Answer»

Solution :Pentaarnminechloridocobalt(III) chloride
Stereochemistry : It SHOWS `d^(2)sp^(3)` HYBRIDISATION. Hence, the SHAPE is octahedral.
Magnetic BEHAVIOUR : There are no unpaired electrons. Hence, the compound is diamagnetic.
Discussion
23754.

Which of the following reaction is an example of a redox reaction

Answer»

`XeF_(2)+PF_(5) rarr [XeF]^(+)+PF_(6)^(-)`
`XeF_(6)+H_(2)O rarr XeOF_(4)+2HF`
`XeF_(6)+2H_(2)O rarr XeO_(2)F_(2)+4 HF`
`XeF_(4)O_(2)F_(2) rarr XeF_(6)+O_(2)`

Solution :law of multiple proportion was proposed by Dalton and verified by Berzelius
Discussion
23755.

Which set of characteristics of ZnS crystal is correct

Answer»

coordination number `(4:4),CCP,Zn^(++)` ion in the alternate tetrahedral VOIDS.
Coordination number`(6:6): hcp, Zn^(++)` ion in all tetraderal voids
Coordination number `(6:4), hcp, Zn^(++)` ion in all octahedral voids.
Coordination number `(4:4): ccp, Zn^(++)` ion in all tetraderal voids.

SOLUTION :ZnS has zinc blende structure. It has cubic close packed (ccp) structure. The `S^(2-)` IONSA re presesnt at the corners of the cube and at the centre of each FACE. Zinc ions occupy half of the tetrahedral sites, Each zinc ion is surrounded by four sulphide ions which are disposed towards the corners of a regular ions which are disposed towards the corners of a regular tetrahedron. Similarly, `S^(2-)` ion is surrounded by four `Zn^(2+)` ions.
Discussion
23756.

Which of the following species is not a pscudo halide

Answer»

`CNO^(-)`
`RCO O^(-)`
`OCN^(-)`
`N N N^(-)`

SOLUTION :`RCO O^(-)` is not PSEUDO HALIDE.
Discussion
23757.

Write reaction and conditions for the conversion of benzyl chloride to benzaldehyde.

Answer»

SOLUTION :
Discussion
23758.

Which sets are the transition elements ?

Answer»

TI, Zr, Hf
V, Nb,Ta
Rh, RB, Pd
All

Answer :D
Discussion
23759.

When CO_(2) is passed through water, which of the following species will be present in water?

Answer»

`H_(2)CO_(3), CO_(2), CO_(3)^(2-), HCO_(3)^(-)`
`HCO_(3)^(-),CO_(3)^(2-)`
`CO_(3)^(-), CO_(2)`
`H_(2)CO_(3), CO_(2)`

SOLUTION :`H_(2)O+CO_(2)hArr H^(+)+HCO_(3)^(-)`
`HCO_(3)^(-)hArr H^(+)+CO_(3)^(2-)`
The species PRESENT will be : `H^(+),CO_(3)^(2-), HCO_(3)^(-) and H_(2)CO_(3)` (unionized).
Discussion
23760.

When Na_2 MnO_4 is kept in strongly acidic solution the products obtained are

Answer»

`NaMnO_4,MnO_2,H_2O`
`Na_2MnO_4,H_2O`
`NaMnO_4,MN,H_2O`
`Na_2MnO_4,Mn,H_2O`

Solution :`MnO_(4)^(-3) overset(H^+)rarrMnO_4^(-) + MnO_2`
Discussion
23761.

Which one of the two compounds, CH_(3)Br " and " CH_(3)I, will react faster in an S_(N)2reaction with — OH ?

Answer»

Solution :`CH_(3)I ` will react faster because it has lower BOND dissociation energy.
Iodine is BIGGER in SIZE and is BETTER leaving group. It will be released at a faster rate in presence of nucleophile.
Discussion
23762.

Which of the following is sugarcane ?

Answer»

WASTE MATERIAL left after CONCENTRATION
Waste material left after PURIFICATION of metal
Waster material after electrolysis
Waste material PRESENT in ore to be removed during concentration

Answer :D
Discussion
23763.

Writethe structureofthe monomers of Dacron.

Answer»

Solution :MONOMERS of DACRON are :
`HOCH_(2) CH_(2)OH and HOOC - (##U_LIK_SP_CHE_XII_C15_E10_009_S01##) - COOH`
Discussion
23764.

What is the mean of concentration of solution ? Discuss different types of concentration of solutions ?

Answer»

SOLUTION :The amount of solute in a unit volume of solution of unit WEIGHT of solvent is called concentration of solution.
Normality formality, MOLARITY, molarity molefraction, weight - FRACTION `(% w//w, %w//V, %V//V)`,ppm are units of concentration.
Discussion
23765.

Which of the following are thermoplastic polmers ?

Answer»

Polythene , urea-formaldehyde , POLYVINYLS
BAKELITE , polythene, polystyrene
Polythene, polystyrene, polyvinyls
Urea-formaldehyde, polystyrene, bakelite

Answer :C
Discussion
23766.

The reduction of which of the following compounds would yields secondary amine

Answer»

alkyl nitrile
CARBYLAMINE
primary amine
sec. nitro compound

Solution :`underset("Carbylamine")(R-N equiv C)+2H_(2) OVERSET(Ni)(rarr)underset(2^(@)" amine")(R-NH-CH_(3))`
Discussion
23767.

Which of the following compounds does not have any geometrical isomer ?

Answer»




ANSWER :D
Discussion
23768.

Total number of elements of 6th period which have one or more than one 4d electrons :-

Answer»

10
16
32
Zero

Solution :6th period all elements CONTAIN 4d ELECTRONS because in 6D ELECTRON FILLED in 5d subshell.
Discussion
23769.

Which one of the following nitro-compounds does not react with nitrous acid

Answer»




SOLUTION :`1^(@)` nitro compound, `2^(@)` NITROCOMPOUND react with `HNO_(2)` acid but `3^(@)` nitro compound does not react with NITROUS acid
Discussion
23770.

The thermodynamics efficiency of cell is given by:

Answer»

`(DELTA H)/(Delta G)`
`(NFE)/(Delta G)`
`-(nFE)/(Delta H)`
Zero

Answer :C
Discussion
23771.

Write the structures of the following compounds:

Answer»

SOLUTION :
Discussion
23772.

Write the IUPAC name for the following compound . (i) K_(2)[Fe(CN)_(3)(Cl)_(2)(NH)_(3)] (ii) [Cr(CN)_(2)(H_(2)O)_(4)][Co("ox")_(2)(en)] (iii)[Cu(NH_(3))_(2)Cl_(2)] (iv)[Cr(NH_(3))_(3)(NC)_(2)(H_(2)O)^(+)] (v) [Fe (CN)_(4)]^(4-)

Answer»

Solution :`(i) K_(2)[Fe(CN)_(3)(Cl)_(2)(NH)_(3)]` - Potassium amminedichloridotricyanidoferrate (III)
`(ii) [Cr(CN)_(2)(H_(2)O)_(4)][Co("ox")_(2)(en)]`-Tetraaquadicyanidochromium (II)
ethene `1,2` diaminebis (oxalato) cobalate (II)
`(iii)[CU(NH_(3))_(2)Cl_(2)]` -diamminedichloro copper (II)
`(IV)[Cr(NH_(3))_(3)(NC)_(2)(H_(2)O)^(+)]` -triammineaquodicyanido-KN CHROMIUM (III) ION
`(v) [Fe (CN)_(4)]^(4-)` -Hexacyanidoferrate (II) ion
Discussion
23773.

When 1.5 g of a non-volatile solute was dissoved in 90 g of benzene, the boiling point of benzene was raised from 353.23^(-1) K to 353.93 K. Calculate the molar mas of solute (K_(b) for benzene=2.52 K kg mol^(-1)).

Answer»


Solution :`M_(B)=(K_(b)xxW_(B))/(DeltaT_(b)XX W_(A))`
`W_(B)=1.5g , W_(A)=90.0 g=0.09" kg", DeltaT_(b)=0.7" K"`
`K_(b)=2.52" k kg MOL"^(-1)`
`M_(B)=((2.52" K kg mol"^(-1))xx(1.5" g"))/((0.7" K")xx(0.09" kg"))=60.0" g mol"^(-1)`.
Discussion
23774.

Vic- dihalide on treatement with zinc dust gives:

Answer»

ALKANE
Alkene
Alkyne
All of these

Answer :A
Discussion
23775.

Which is more basic La(OH)_(3)zor Lu(OH)_3 ? Why?

Answer»

Solution :`La(OH)_3,` due to large SIZE of La due to lanthanoid contraction.
Discussion
23776.

Which of the following has highest ionisation enthalpy?P,N,As,Sb.

Answer»

P
N
As
Sb

Answer :B
Discussion
23777.

Which is a homogeneous system ?

Answer»

A SOLUTION of SUGAR in water
Concrete
Muddy water
Bread

Answer :A
Discussion
23778.

Which of the following alkyl halides is hydrolysed by SN^2mechanism ?

Answer»

`C_6H_5CH_2Br`
`CH_3Br`
`CH_2 = CHCH_2Br`
`(CH_3)_3CBr`

ANSWER :B
Discussion
23779.

Which of the following is not emulasifing agent for W/O emulsion?

Answer»

Lampblack
Long chain alcohol
Proteins
Heavy METAL salts of FATTY acids

Solution :PROTEIN is emulsifying AGENT for O/W EMULSION.
Discussion
23780.

Which of the following salts is used in the bead test for basic radicals ?

Answer»

`Na(NH_(4))HPO_(4).4H_(2)O`
`Na_(2)HPO_(4)`
`(NH_(4))_(2)SO_(4).FeSO_(4).6H_(2)O`
`(NH_(3))_(2)HPO_4.4H_2O`

Solution :Microcosmic salt on HEATING produces a transparent bead of sodium metaphosphate `(NaPO_3).`
`Na(NH_(4))HPO_(4).4H_(2) overset(Delta)to NH_(3)+5H_(2)O+NaPO_(3)`
`NaPO_(3)` combines with certain metallic OXIDES to form coloured BEADS of the corresponding orthophosphates, e.g.,
`NaPO_(3)+CuO to underset(("Blue"))(CuNaPO_(4))`
Hence , microcosmic salt is sometimes USED in place of borax for performing borax bead TEST.
Discussion
23781.

The van der Waal's constants for two gases are as follows: Gas a (atm L^(2)" mol"^(-2)) " "b(L mol^(-1)) X" "1.39" "0.0391 Y" "3.59" "0.0427 Which of them is more easily liqufiable and which has greater molecular size ?

Answer»

Solution :GREATER the value of .a., more EASILY the gas is liquefiable. Similarly, greater the value of .b., greater is the MOLECULAR size. HENCE, gas Y will be more easily liquefiable and will have greater molecular size.
Discussion
23782.

Which of the following complexes will show geometrical as well as optical isomerism (where en = ethylene diamine)?

Answer»

`[PT(NH_3)_2Cl_2]`
`[Pt(NH_3)_2Cl_4]`
`[Pt(EN)_3]^(4+)`
`[Pt(en)_3]Cl_2`

ANSWER :D
Discussion
23783.

The sum of primary valency and secondary valance of the metal M in the complex[M(en) _2(Ox) ]Clis L

Answer»

3
6
`-3`
9

Answer :D
Discussion
23784.

Which one of the following complexes shows optical isomerism- (en = ethylenediamine)

Answer»

`[Co(NH_3)Cl_2]CL`
`[Co(NH_3)_3Cl_3]`
cis`[Co(EN)_2Cl_2]Cl`
TRANS`[Co(en)_2Cl_2]Cl`

Answer :C
Discussion
23785.

Which gives turbidity with HBr?

Answer»




ANSWER :A::B::C
Discussion
23786.

The variation of equivalent conductance of strong electrolyte with (concentration)""^(1//2) is represtnted by

Answer»




Solution :In CASE of equivalent conductance of STRONG ELECTROLYTE there is little INCREASE with DILUTION.
Discussion
23787.

Which of following species is less reactive than benzene in electrophilic substitution reaction

Answer»

ANILINE
bromobenzene
nitrobenzene
phenol

Answer :C
Discussion
23788.

What is the name given to the drugs which releive or reduce pain?

Answer»

SOLUTION :ANALGESICS.
Discussion
23789.

Which of the following reaction is not correct according to major product

Answer»


`H_(3)C-CH_(2)-underset(F)underset(|)(CH)-CH_(3)underset(Delta)overset(Alc.KOH)(to)CH_(3)-CH=CH-CH_(3)`

`C Cl_(3)-underset(O)underset(||)(C)-Hoverset(NaOH)(to)CHCl_(3)+HCOONA`

Answer :B
Discussion
23790.

Which of the following compounds is chiral?

Answer»

3-Pentanol
1-Pentanol
3-Methyl-1-butanol
3-Methyl-2-butanol

Solution :`CH_(3)-underset(CH_(3))underset(|)(C)H-underset(OH)underset(|)overset(**)(C)H-CH_(3)` 3 Methyl-2-butanol has a chiral carbon and hence is optically active.
Discussion
23791.

Which of the following give Liebermann nitroso reaction ?

Answer»




Solution :PHENOL, `2^(@)` amine can GIVE liebermann nitroso REACTION
Discussion
23792.

Which of the following alcohols will not be easily oxidised?

Answer»

`CH_(3)OH`
`CH_(3)CH_(2)OH`
`(CH_(3))_(3)COH`
`CH_(3)CHOHCH_(3)`

Solution :Only tertiary alcohols i.e. `(CH_(3))_(3)COH` cannot be easily oxidised.
Discussion
23793.

Which one of the following is not the characteristic of the alcohols :

Answer»

There boiling POINTS rise fairly UNIFORMLY with a rise in molecular weight
Lower members have a pleasant smell but burning taste and the higher ones are odourless and tasteless
These are lighter than water
Lower members are insoluble in water and ORGANIC SOLVENTS but the solubility GOES on increasing with the rise of molecular weight

Answer :D
Discussion
23794.

Which of the following will show optical isomeris ?

Answer»

`[CU(NH_(3))_(4)]^(2+)`
`[ZnCl_(4)]^(2-)`
`[CR(C_(2)O_(4))_(3)]^(3-)`
`[Co(CN)_(6)]^(3-)`

ANSWER :C
Discussion
23795.

The structure of CsCI crystal is:

Answer»

BODY CENTRED CUBIC lattice
Face centred cubic lattice
Octahedral
None

Answer :A
Discussion
23796.

Which of the following is incorrect combination ?

Answer»

<P>(I)(III)(P)
(III)(i)(Q)
(III)(ii)(Q)
(IV)(i)(R)

Solution :
Discussion
23797.

When copper nitrate is strongly heated, the residue consists of:

Answer»

COPPER dioxide
Cuprous oxide
Cupric oxide
Copper nitrate

Answer :C
Discussion
23798.

Which one of the following species will most readily proceed through S_(N)2 reaction ?

Answer»




Solution :`S_(N)2` is a CONCERTED reaction, so will be FAVOURED by least sterically hindered carbon ATOM or a primary carbon atom. Hence ETHYL chloride is most reactive in `S_(N)2`
Discussion
23799.

Zinc is extracted from Zinc blende by __________

Answer»

CARBON REDUCTION process
Nitrogen reduction process
Oxygen reduction process
All of these

Answer :A
Discussion
23800.

Write short on the following : (i) Carbylamine reaction (ii) Hofmann's bromamide reaction (iii) Gabriel phthalimide synthesis.

Answer»

SOLUTION :`R-NH_(2)+CHCl_(3)+"alc.3KOH"overset("Heat")RARR CH_(3)-CH=CH_(2)`
`CH_(3)-CH_(2)-CH_(2)-Br`
`R-CONH_(2)+Br_(2)+4NaOH rarr R - NH_(2)+Na_(2)CO_(3)+2NaBr+2H_(2)O`
Discussion