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101.

Which of the following is used as tonics?

Answer»

MILK of magnesia
Argyrol
COLLOIDAL AU & colloidal CA
Alum

Solution :colloidal Au & colloidal Ca
Discussion
102.

When bismuth chloride is poured into a large volume of water, the white precipitate produces as

Answer»

`Bi(OH)_(3)`
`Bi_(2)O_(3)`
`BiOCl`
`Bi_(2)OC l_(3)`

Solution :`BiCl_(3)+H_(2)O to underset(("WHITE PPT"))(BiOCl)+2HCl`
Discussion
103.

Which of the following exist in polymeric form ?

Answer»

`HPO_(3)`
`H_(4)P_(2)O_(7)`
`H_(3)PO_(4)`
None of these

Solution :`(HPO_3)_n` Polymetaphosphoric ACID
Discussion
104.

What is the net redoc reaction between maganese dioxide from hydrochloric acid ?

Answer»

SOLUTION :CHEMICAL reaction is given as : `4HCl + MnO_(2) rarr MnCl_(2)+ 2H_(2)O + Cl_(2)`
The net redox reaction between MANGANESE dioxide and hydrochloric ACID is,
`2Cl^(-) + Mn^(4+) rarr Cl_(2) + Mn^(2+)`
Discussion
105.

Which of the following is isomorphous with MgSO_(4).7H_(2)O?

Answer»

Green VITRIOL
Blue vitriol
RED vitriol
Vitriol of mass

Solution :In the REACTION:
`CO+(1)/(2)O_(2)rarrCO_(2), N_(2)+O_(2)rarr2NO`
Discussion
106.

Which of the following is the variation of physical adsorption with temperature ?

Answer»




SOLUTION :The VARIATION of PHYSICAL ADSORPTION with TEMPERATURE is
Discussion
107.

Vapour pressure.

Answer»

Solution :The pressure EXERTED by the VAPOUR of a liquid (or solid) when it is in equilibrium with the liquid (or solid) PHASE at a constant temperature is CALLED the vapour pressure of the liquid ( or solid).
Discussion
108.

What are zwitterions ?Give one example.

Answer»

Solution :A zwitterion is a DIPOLAR ion FORMED by neutralization of ACIDIC and basic centres present within the molecule. For example , all amino ACIDS and sulphuric acid exist as zwitterions.
Discussion
109.

What is the EAN of nickel in Ni(CO)_4 ?

Answer»

34
35
32
36

Answer :D
Discussion
110.

When EDTA solution is added to Mg^(2+) ion solution, then which of the statements is not true

Answer»

Four coordinate SITES of `Mg^(2+)` are occupied by EDTA and REMAINING two sites are occupied by water MOLECULES
All six coordinate sites of `Mg^(2+)`
pH of the SOLUTION is decreased
Colourless `[Mg-EDTA]^(2-)`

Solution :`Mg^(2+)` FORMS an octahedral complex with EDTA where all the six sites of `Mg^(2+)` are occupied.
Discussion
111.

What happens when persistent dialysis of a colloidal solution is carried out ?

Answer»

Solution :On persistent dialysis, traces of the electrolyte PRESENT in the sol are REMOVED almost completely and the COLLOIDS BECOME unstable and ultimately coagulate.
Discussion
112.

What will be tha Van't Hoff factor i for the 0.1 M ideal solution ?

Answer»

`0.1`
ZERO
10
1

Answer :D
Discussion
113.

Which of the following species will be optically active ?

Answer»




Solution :2, 2'6, 6' TETRA substituted biphenyls are OPTICALLY active
Discussion
114.

Which of following statements are correct

Answer»

Average VELOCITY of molecules of a gas in a container is zero
All molecules in a gas are moving with the same speed
If an open container is heated from 300 K to 400 K the fraction of air which GOES out with respect to originally present is `1/4`
If compressibility factor of a gas at STP is less than unity then its MOLAR volume is less than 22.4 L at STP

Solution :(C )`n_1T_1=n_2T_2`
`nxx300=n_2xx400`
`n_2=3/4n`
excape out=`(n-3/4n)/n=1/4`
(D)`(PV)/(RT)lt1`
`Zlt1`
Molar volume is less than 22.4 LIT. at STP.
Discussion
115.

Which of the following polymers , need atleast one diene monomer for their preparation ?

Answer»

Dacron
BUNA-S
NEOPRENE
Novolac

Solution :MONOMERS of Buna -S are : 1,3-butadiene and STYRENE and monomer of neoprene is chloropene, i.e., 2-chloro-1,3-butadiene.
Discussion
116.

Give the relationship between rate constant and activation energy of a reaction?

Answer»

SOLUTION :`K=Ae^(-E_a//RT)`
Discussion
117.

Which of the following species is not a pseudo halide :-

Answer»

`CNO​ ^(-)`
`RCOO​ ^(-)`
`CN^(-)`
`N3^(-)`

SOLUTION :In PSEUDO halide 'N' MUST be present.
Discussion
118.

When CS_2 layer containing both Br_2 and I_2 is shaken with excess of Cl_2 water , the violetcolour due to I_2 disappears and orange colour due to Br_2 appears . The disappearance of violet colour is due to the formation of :

Answer»

`I_3^(-) `
`ICI`
`I^(-) `
`HIO_3`.

ANSWER :B
Discussion
119.

Write the name, stereochemistry and magnetic behaviour of the following : K_(2)[Ni(CN)_(4)]

Answer»

Solution :Potassium tetracyanonickelate(II)
Stereochemistry : Nickel undergoes `dsp^(2)` hybridisation. The shape of the COMPOUND is square PLANAR.
Magnetic BEHAVIOUR : There are no unpaired ELECTRONS. Hence, the compound is diamagnetic.
Discussion
120.

Two gases X (Mol. Wt M_(X) ) and(Mol. Wt. M_(y), M_(y)gtM_(X)) are at the same temperature T in two different containers. Their root mean square velocities are C_(x) and C_(Y) respectively. If the average kinetic energies per molecule of two gases X and Y are E_(X() and E_(Y) respectively, then which of the following relations (s) is (are) true?

Answer»

`E_(X)gtE_(Y)`
`C_(X)gtC_(Y)`
`E_(X)=E_(Y)=3/2RT`
`E_(X)=E_(Y)=3/2k_(B)T`

Solution :Average kinetic energy per MOLECULE of GAS `E_(K)`
`=3/2k_(B)T`
where `k_(B)=` Boltzmann constant
`impliesbar_(k)=3/2(RT)/(N_(A))" "( :. k_(B)=R/(N_(A)))`
`C_(X)=sqrt((3RT)/(M_(x)),C_(Y)=sqrt((3RT)/(M_(Y)))`
`(C_(X))/(C_(Y))=sqrt((3RT)/(M_(X))XX(M_(Y))/(3RT))=sqrt((M_(Y))/(M_(X)))gt1""[............M_(Y)gtM_(X)]`
`:.C_(X)gtC_(Y)`
Discussion
121.

The solubility of AgSCN in 0.002 M NH_(3) is (K_(sp) for AgSCN=1.0xx10^(-12),K_(d) for Af(NH_(3))_(2)^(+)=1.0xx10^(-8))

Answer»

`3xx10^(-5)M`
`4XX10^(-4)M`
`4xx10^(-5)M`
`2xx10^(-5)M`

Solution :`AG(NH_(3))_(2)^(+)hArrAg^(+)+2NH_(3)`
`K_(d)=1.0xx10^(-8)=([Ag^(+)][NH_(3)]^(2))/([Ag(NH_(3))_(2)^(+)])`
If S mol `L^(-1)` = solubility of AgSCN, `[Ag(NH_(3))^(2)]^(+)`
`=S,[SCN^(-)]=S`
Hence, `([Ag^(+)][0.002]^(2))/(S)=1.0xx10^(-8)`
`implies[Ag^(+)]=(1.0xx10^(-8)S)/(4xx10^(-6))=2.5xx10^(-13)S`
Also, `K_(sp)[AgSCN]=1.0xx10^(-12)=[Ag^(+)][SCN^(-)]`
`=2.5xx10^(-3)SxxSimpliesS=2.0xx10^(-5)molL^(-1)`
Discussion
122.

Which of the following compound does not react with Lucas reagent ?

Answer»

`(CH_3)_3C-CHO`
`(CH_3)_3C-OH`
`(CH_3)_2CH-OH`
`CH_3-OH`

ANSWER :A
Discussion
123.

Which of the following is not a crystal system ?

Answer»

TRICLINIC
Rhombohedral
Tetragonal
Isomorphous

Answer :D
Discussion
124.

Which of the following species has equal number of sigma- and pi- bonds?

Answer»

`(CN)_(2)`
`CH_(2)(CN)_(2)`
`HCO_(3)^(-)`
`XeO_(4)`

Solution :`XeO_(4)` has FOUR `sigma`- and four `pi`-BONDS.
Discussion
125.

Which is true among the following?

Answer»

`PH_(3)` is strong base than `NH_(3)`
BOND angle in `PH_(3)` is more than that of `NH_(3)`
`PH_(3)` is stronger REDUCING agent than `NH_(3)`
Boiling poinnt of `PH_(3)` is more than that of `NH_(3)`

ANSWER :A
Discussion
126.

Which oxide of sulphur can act as an oxidising as well as reducing agent?

Answer»

Solution :`SO_2`. Because sulphur can INCREASE its oxidation number + 4 + 6 and ALSO decrease it to +2 or to zero
Discussion
127.

The specific conductance of 0-1M NaCl solution is 1.6xx10^(-2) ohm^(-1)cm^(-1). Its molar conductance in ohm^(-1) cm ^(2) "mol"^(-1) is

Answer»

`1.06xx10^(2)`
` 1.06xx10^(3)`
`1.06xx10^(4)`
`53`

SOLUTION :`k=1.06xx10^(-2)ohm^(-1)CM^(-1)`
MOLARITY =0.1 M
`lambda_(m)=(kxx1000)/("Molarity")=(1.06xx10^(-2)xx1000)/(0.1)`
`=1.06xx10^(2)ohm ^(-1)cm^(2)"MOL"^(-1)`
Discussion
128.

Trimethyl amine islessbasicthanmethylaminebecause

Answer»

it does notreact withacid
it isacidic
it has crowdingof alky GROUPS
it can donateelectronpaireasily

SOLUTION :`+ I` effectof ALKYLGROUP attached to nitrogenin trimethyl amineis lessthanmethylaminedue tostearic HINDRANCE.
Discussion
129.

Which of the following will give 3-pentanone.

Answer»

`(CH_3-CH_2COO)_(2)Ca overset(Delta)`
`CH_(3)-CH_(2)-C-=N overset((1) CH_(3)-CH_(2)-MgBr)UNDERSET((2) H_3O^(o+))to`
`CH_(3)-overset(O)overset(||)(C)-CH_(2)-CH_(2)-overset(O)overset(||)(C)-OC_(2)H_(2) overset((1)H_2O //H^(+))underset((2)NAOH(cao))to`
`CH_(3)-CH_(2)-overset(O)overset(||)(C)-underset(CH_3)underset(|)(C)H-overset(O)overset(||)(C)-OH overset(Delta)to`

Answer :A::B::D
Discussion
130.

What is the role of graphite rod in the electrometallurgy of alumi-nium ?

Answer»

Solution :The graphite ROD is useful in the ELECTROMETALLURGY of aluminium for reduction of alumina to aluminium.
`2Al_2O_3 + 3C to 4Al + 3CO_2`
Discussion
131.

Which colour is formedwhenamyloseis treated with idoine solution?

Answer»

PURPLE
RED
Blue
VIOLET

Answer :C
Discussion
132.

Which one of the following is formed when Diethyl ether is treated with dil. H_2SO_4 ?

Answer»

`CH_3CH_2HSO_4`
`CH_3-CH_2OH`
`CH_2=CH_2`
`CH_3 - CH_3`

SOLUTION :`CH_3-CH_2OH`
Discussion
133.

Two liquids A and B form an Ideal solution. At 300K, the V.P of solution containing one mole of 'A' and 4 mole 'B' is 560mm Hg. At the same temp. If one mole of 'B' is taken out from the solution the V.P of the solution has decreased by 10mm Hg, the V.P, of pure A & B are (in min)

Answer»

400600
500500
300700
200800

Answer :A
Discussion
134.

Which of the following carbocations is least stable

Answer»

`CH_(3)-CH_(2) -overset(CH_(2)-CH_(3))overset(|)UNDERSET(CH_(2)-CH_(3))underset(|)(C^(OPLUS))`
`CH_(3)-CH_(2) -C^(oplus)H-CH_(2)-CH_(3)`
`CH_(3)-CH_(2) - C^(oplus)H_(2)`
`CH_(3)-CH_(2)-C^(oplus)H-overset(H)overset(|)underset(CH_(3))underset(|)C-CH_(3)`

Answer :C
Discussion
135.

Which of the following is the correct order of stability of allotropes of carbon?

Answer»

`"DIAMOND" LT" GRAPHITE"lt"FULLERENE"`
`"Fullerene"lt"graphite"lt"diamond"`
`"Graphite"lt"fullerene"lt"diamond"`
`"Fullerene"lt"diamond"lt"graphite"`

ANSWER :D
Discussion
136.

Which is most basic :

Answer»

`NH_3`
`CH_3NH_2`
`(CH_3)_2NH`
`C_6H_5NH_2`

ANSWER :C
Discussion
137.

Which of the following reaction is an example of nucleophilic substitution reaction ?

Answer»

`2RX + Na rarr R-R+2NaK`
`RX+H_(2)rarr RH+HX`
`RX+Mg rarr RMg X`
`RX+KOH rarr ROH+KX`

Solution :`RX+KOH rarr ROH+KX` is an EXAMPLE of nucleophilic SUBSTITUTION REACTION.
Discussion
138.

What is the use of Henry's law ?

Answer»

In PREPARATION of COLD DRINKS
Inbiochemical PROCESSES
In the idustry
All of these

ANSWER :D
Discussion
139.

Which reacts with chlorine to form phosgene:

Answer»

`SO_2`
`CO_2`
NO
CO

Answer :D
Discussion
140.

While filling up of electrons in the atomic orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why ?

Answer»

Solution :Applying `( n+ L)` rule, 4S orbital has lower ENERGY than 3d orbital. Hence, 4s is filled first. After the ortibals are flled 4s goes BEYOND 3d, i.e., 4s is father from nucleus thant 3d. Hence, electron from 4s is REMOVED earlier than from 3d.
Discussion
141.

What are the monomers of SBR or Buna -S ?

Answer»

SOLUTION :Styrene `(25%), CH_(6)H_(5)CH=CH_(2)` and 1,3-butadiene `(75%),CH_(2)=CH-CH=CH_(2)`.
Discussion
142.

Which of the following is a biodegradable synthetic polymer ?

Answer»

ALIPHATIC POLYESTERS
PHBV
Nylon-2-nylon-6
All of these

ANSWER :D
Discussion
143.

Which among the following molecules/species is/are aromatic?

Answer»

Cyclobutadienly dianion
Cyclooctadienly dianion
Cycloheptatrienly cation
All are aromatic

Solution :Cyclobutadienyl dianion has SIX, cyclooctadienyl dianion has cycloheptatrienyl cation has six delocalized `PI -` ELECTRONS. THEREFORE, all are aromatic HENCE, (D) is the correct answer
Discussion
144.

Total number of possible aldohexoses belonging to D-series is.

Answer»


SOLUTION :In all 16 ALDOHEXOSES are POSSIBLE. Out of these 8 BELONG to D-series and 8 to the L-series.
Discussion
145.

Which one of the following catalyst is used in the preparation of high density polyethylene?

Answer»

benzoyl peroxide
zeigler NATTA catalyst
AMMONIUM PER sulphate
hydrogen peroxide

Solution :zeigler natta catalyst
Discussion
146.

When chlorine water is added to an aqueous solution of sodium halide in the presence of chloroform, violet colouration is obtained. When more of chlorine water is added, the violet colour disappears and the solution becomes colourless. This confrims that sodium halide is :

Answer»

Chloride
fluoride
Bromide
Iodide.

Solution :Sodium HALIDE is Nal. CHLORINE displaces iodine form Nal which imparts violet colour - ation to chloroform layer. However, EXCESS of chlorine water dissolves iodine to form a colourless solution.
`2Na+Cl_(2) to 2NaCl+l_(2)`
`l_(2)+5Cl_(2)+6H_(2)O to underset(("Colourless"))(2HlO_(3))+10HCl`
Discussion
147.

The shape of [Cu(NH_3)_4]CI_2 is:

Answer»

Tetrahedral
Octahedral
Square planar
Pyramidal

Answer :C
Discussion
148.

Write general equation for preparation of ether by Williamson synthesis.

Answer»

SOLUTION :`R - X +R^(1) ONato R - O - R^(1) + NAX `
Discussion
149.

Which of the following is not present in a nucleotide?

Answer»

A) cytosine
B) GUANINE
C) ADENINE
D) Thyroxin

Solution :Nucleotide contains nitrogenous BASES like adenine, guanine, THYMIN, cytosine and URACIL.
Discussion
150.

Which of the followingis a monomer of teflon ?

Answer»

Difluoroethane
Trifluoroethane
Tetrafluoroethane
NONE of the above

SOLUTION :TEFLON is an ADDITION polymerof tetrafluoroethlene.
`underset"Tetrafluoroethylene " (nF_2C=CF_2) underset"Pressure"overset"Heat"to underset"Teflon"((--F_2C-CF_2--)_n)`
Discussion