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18851.

What are emulsions ? Give three uses of emulsions in industry.

Answer»

Solution :A colloidal dispersion of one liquid into another liquid is called EMULSION. For example, MILK is an emulsion in which liquid fat is dispersed in water.
The important uses of emulsions are :
1. Many pharmaceutical and cosmetic PREPARATIONS avaiable in liquid form such as cod-liver oil, B-comlex etc. are emulsion of water in oil type . these are readily adsorbed in the intestines .
2. The cleasing action of soap is based upon the FORMATION of oil in water type emulsion
3. Milk which is an important constituent of our diet is an emulsion of fat in water .
Discussion
18852.

What is the relation between the edge lengths 'a', 'b' and 'c' in body - centred orthorhombic crystal?

Answer»

Solution :For BODY - centred ORTHORHOMBIC CRYSTAL, `a ne B ne c.`
Discussion
18853.

Which of the following obey EAN rule?

Answer»

`[CO(NH_(3))_(6)]^(3+)`
`CR(CO)_(6)`
`[V(CO)_(6)]^(-)`
`[Zn(EDTA)]^(-2)`

SOLUTION :All obey EAN rule .
Discussion
18854.

What is molality of pure water?

Answer»

1
18
55.5
None of these

Solution :Molality of water MEANS no of moles of water in 1000 g of water which is `=(1000)/(18)=55.55` MOL
Discussion
18855.

Which is a Lewis base

Answer»

`B_(2)H_(6)`
`LiAIH_(4)`
`AIH_(4)`
`NH_(4)`

ANSWER :D
Discussion
18856.

Write structures of the compound whose IUPAC names are as follows : 2-3 Diethylphenol

Answer»

SOLUTION :
Discussion
18857.

Using valence bond approach, explain the shape and magnetic behaviour of [Ni(NII_(3))_(6)]^(2+).

Answer»

Solution :Electronic CONFIGURATION of Ni : `4S^(2) 3d^(8)`. Electronic configuration of Ni2+ : `4s^(0) 3d^(8)`

It has octahedral shape. It is PARAMAGNETIC DUE to the presence of two unpaired ELECTRONS.
Discussion
18858.

What is the effect of adding catalyst on free energy change (DeltaG) of a reaction ?

Answer»

SOLUTION :No CHANGE in `DELTA`G.
Discussion
18859.

Which of the following is an isomer of ethanol?

Answer»

Acetaldehyde
Nitrophenol
PICRIC acid
DIMETHYL ETHER

Solution :Dimethyl ether
Discussion
18860.

Which out of the following is the correct composition of Crooke's glass?

Answer»

`Na_(2)CO_(3).CaCO_(3).SiO_(2)`
`K_(2)CO_(3).CaCO_(3).SiO_(2)`
`Na_(2)CO_(3).K_(2)CO_(3).PbCO_(3).SiO_(2)`
`K_(2)CO_(3).PbCO_(3).CeO_(2)`. SAND.

Solution :`K_(2)CO_(3).PbCO_(3).CeO_(2)` sand. It cuts harmful U.V. RAYS of SUN.
Discussion
18861.

Thyroglobin is an example of

Answer»

scleroproteins
STRUCTURAL PROTEINS
FIBROUS proteins
globular proteins

ANSWER :D
Discussion
18862.

The silicate anion in the mineral kinoite is a chain of three SiO_(4) tetrahedra, that share corners with adjacent tetrahedra. The charge pof silicate anion is

Answer»

`-4`
`-8`
`-6`
`-2`

Answer :C
Discussion
18863.

What are the various methods by which carbon-di-oxide is prepared?

Answer»

Solution :(i) Carbon monoxide can be prepared by the reaction of carbon with limited amount of oxygen.
`2C+O_(2) to 2CO`
(ii) (a) On industrial scale carbon monoxide is produced by the reaction of carbon with AIR.
(b) The carbon monoxide formed will contain nitrogen gas also and the mixture of mitrogen and carbon monoxide is called producer gas.
(c) `2C+O_(2)//N_(2)("air")to underset("Producers Gas")(2CO+N_(2))`
(d) The producer gas is then passed through a solution of COPPER (I) chloride under pressure which results in the formation of `CuCl(CO).2H_(2)O`.
(e) At reduced pressures this solution RELEASES the pure carbon monoxide.
(iii) Pure carbon monoxide is prepared by warming methanoic ACID with concentrated sulphuric acid which acts as a dehydrating AGENT.
`HCOOH+H_(2)SO_(4) to CO+H_(2)O+H_(2)SO_(4)`
Discussion
18864.

Which one of following does not decolounse an acidified KMnO_4solution ?

Answer»

`SO_(2)`
`FeCl_(3)`
`H_(2)O_(2)`
`FeSO_4`

SOLUTION :`FeCl_3` also acts are oxidizing agent
Discussion
18865.

Which one of the following gases is liberated when ethyl alcohol is heated with methyl magnesium iodide?

Answer»

Methane
Ethane
CARBONDIOXIDE
Propane

Answer :A
Discussion
18866.

Which one of the following ionic species will impart colour to an aqueous solution ?

Answer»

`TE^(4+)`
`CU^+`
`ZN^(2+)`
`Cr^(3+)`

ANSWER :D
Discussion
18867.

Transition elements exhibit higher enthalpiese of atomization because

Answer»

of LARGE number of unpaired electrons
of having stronger interatomic INTERACTION
of strong bonding between ATOMS
All of these

Answer :D
Discussion
18868.

There are 14 elements in actinoid series. Which of the following elements does not belong to this series?

Answer»

U
Np
TM
Fm

Solution :ELEMENTS with atomic number 90 to 103 constitute the actinoid series but THULIUM (Tm) hatomic number 69.
Discussion
18869.

Which of the following options does not represent ground state electronic configuration of an atom?

Answer»

`1s^(2)2s^(2)2p^(6)3s^(2)3P^(6)3d^(8)4S^(2)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(9)4s^(2)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(1)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(1)`

Answer :B
Discussion
18870.

When vapours of acetic acid are passed over …….at 300^@C we get acetone :

Answer»

MnO
CuO
MaO
Cu

Answer :A
Discussion
18871.

Write the expression for the solubility produce of Hg_2Cl_2.

Answer»

SOLUTION :`Hg_2Cl_2 leftrightarrowHg_2^(2+)+2CL^-`
`K_(sp)=[Hg_2^(2+)][CL^-]^2`
`=(s)(2s)^2`
`K_(sp)=4s^3`
Discussion
18872.

Which of the following statements are correct about the above reaction ?

Answer»

PRODUCT (B) is
Product (B) is
Product (C ) is
Product (C ) is

ANSWER :A::C
Discussion
18873.

When a colourless gas is passed through bromine water, decolourization takes place. The gas is:

Answer»

`HCL`
`HBR`
`H_2S`
`SO_2`

ANSWER :D
Discussion
18874.

Which of the following pairs of structures represents facial and meridional isomers resectively ?

Answer»




ANSWER :A
Discussion
18875.

Trimethyamine is a 1° amine

Answer»


ANSWER :F
Discussion
18876.

Which of the following is not a Bronsted acid

Answer»

`CH_(3)NH_(4)^(+)`
`CH_(3)COO^(-)`
`H_(2)O`
`HSO_(4)^(-)`

Solution :Those substance which give a PROTON is called Bronsted acid while `CH_(3)COO^(-)` don't have proton so it is not a Bronsted acid.
Discussion
18877.

Which of the following is protein hormones

Answer»

insulin
testosterone
thyroxin
progestron

Answer :A
Discussion
18878.

Write the formulas for the following coordination compounds : Amminebromidochloridonitrito-N-platinate(II)

Answer»

SOLUTION :`[Pt(NH_(3))BRCL(NO_(2))]^(-)`
Discussion
18879.

When wine is put in air it becomes sour due to :

Answer»

OXIDATION of `C_2H_5OH` into `CH_3COOH`
Bacteria
Virus
Formic ACID formation

Answer :A
Discussion
18880.

The solubility of gas in liquid increases with

Answer»

INCREASE in temperature
decrease in GAS temperature
decrease in temperature
amount of LIQUID taken.

Answer :C
Discussion
18881.

Which of the following issuitable alternative for density of the solution , when molarity ( M) and molality ( m ) of an aqueous solution of urea is same at fixed temperature ? ( Molecular wt. of urea= 60 )

Answer»

`1- ( 3M)/( 5)`
`1- ( M )/( 25)`
`( 50+3m)/( 50)`
`( 25+2m)/( 25)`

Solution :`("Molarity")/("Molarity")= ( 1000xx W )/( M XX V )xx ( MxxW_(0))/(1000 xx W ) `
`:.("Molarity")/("Molarity")= ( W_(0))/(V) gm//ml`
Now molarity=molality
`:. ( W_(0))/(V) = 1 gm //ml`
`:. Dm //ml =1 gm//ml + ( "molarity" xx M)/(1000)`
For urea molecular mass ( M=`60 gm //ml`
`:.d= 1+ ( "molarity"xx 60)/( 1000) :. d =(50 + 3M)/(50)`
Discussion
18882.

Which of the following will give the racemised product on hydrolysis in pressure of H_(2)SO_(4) ?

Answer»

`Ph-underset(CH_(3))underset(|)CH-OVERSET(O)overset("||")C-O-CH_(2)CH_(3)`


ANSWER :D
Discussion
18883.

Which of the following is detected in body tissues

Answer»

testosterone
estrogen
sitosterol
prostaglandins

Answer :D
Discussion
18884.

Which of the following statement(s) is/are false :

Answer»

`Delta_(r)S" for "1/2N_(2)(G)toN(g)` is positive
`DeltaG_("system")` is always zero for a reversible process in a closed system
`DeltaG^(@)` for an ideal GAS is a FUNCTION of temperature and pressure
entropy of a closed system is always maximized at equilibrium

Answer :B::C::D
Discussion
18885.

Two flask X and Y have volume 1 L and 2 L respectively and each of them contain 1mole of same ideal gas. The temperature of the flask are so adjusted that average speed of molecules in X is twice as those in Y. The pressure in flask X would be:

Answer»

<P>same as that in Y
half of that in Y
`(1)/(8)TH` of that in Y
8 times of that in Y

Solution :`PV=(1)/(3)MnU_("rms")^(2)`
SINCE `(U_(avg))_(x)=2(U_(avg))_(y)`
`P_(x)(I)=4xxP_(y)xx2`
`P_(x)=8P_(y)`
Discussion
18886.

Which of the following reacts with NaNO_(2)+HCl to give phenol

Answer»

`C_(6)H_(5)CH_(2)NHCH_(3)`
`(CH_(3))_(2)NH`
`CH_(3)NH_(2)`
`C_(6)H_(5)NH_(2)`

Solution :`C_(6)H_(5)NH_(2)UNDERSET(HCl)overset(NaNO_(3))rarrC_(6)H_(5)N_(2)Cloverset(H_(2)O)rarrC_(6)H_(5)OH`\
Discussion
18887.

Which of the following substance may be used as antiseptic as well as disinfectant

Answer»

Formaldehyde
Chlorine
`KMnO_4`
Phenol

Answer :D
Discussion
18888.

The transformation: can be best carried out by

Answer»

Wolff-Kishner REDUCTION
Clemmensen's reduction
Raney NI reduction of CYCLIC thioacetal
All the three

Answer :C
Discussion
18889.

What is meant by 'disproportionation'? Give one exmpale of disproportionation reaction in aqueous solution.

Answer»
Discussion
18890.

Three separate samples of a solution of a single salt gave these results. One formed a white precipitate with excess of ammonia solution, one formed a white precipitate with dil NaCl solution and one formed a black precipitate with H_(2)S. The salt could be :

Answer»

`AgNO_(3)`
`PB(NO_(3))_(2)`
`Hg(NO_(3))_(2)`
`MnSO_(4)`

ANSWER :B
Discussion
18891.

Which of the following pairs does not represent a pair of isomers?

Answer»

`CH_(3)CH_(2)OCH_(2)CH_(2)CH_(3)`
`CH_(3)underset(CH_(3))underset(|)(CH)OCH_(2)CH_(3)`
`CH_(3)CH_(2)COOHandCH_(3)COOCH_(3)`
`CH_(3)CH_(2)NO_(2)andNH_(2)CH_(2)COOH`
`C_(6)H_(5)underset(O)underset(||)(C)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-C_(6)H_(5)`and `CH_(3)-underset(C_(6)H_(5))underset(|)overset(CH_(3))overset(|)(C)-underset(O)underset(||)(C)-C_(6)H_(5)`

Answer :D
Discussion
18892.

Which of the following is strongest base?

Answer»

`La(OH)_(3)`
`Ly(OH)_(3)`
`Ce(OH)_(3)` is most BASIC in lanthanoid series
`Yb(OH)_(3)`

Answer :A
Discussion
18893.

Which metals are present in german silver ?

Answer»

CU
NI
Zn
Ag

SOLUTION :Germansilver has a composition of `Cu 56%, Zn24% and Ni 20%`.
Discussion
18894.

Which one of the following compound is important for photosynthesis?

Answer»

CO
`CO_(2)`
`COCl_(2)`
`C`

ANSWER :B
Discussion
18895.

What are the different oxidation states exhibited by the lanthanoids ?

Answer»

Solution :The most common OXIDATION state of lanthanoids is +3. HOWEVER, some lanthanoids also show an oxidation state of +2 and +4. For EXAMPLE, Eu shows an oxidation state of +2 and Ce shows an oxidation state of +4.
Discussion
18896.

Which elements is named after the name of a planet is

Answer»

Hg
Po
Pu
Ra

Answer :C
Discussion
18897.

Which of the following relation is correct for a first order reaction? (k=rate constant, r=rate of reaction , c=conc. Of reactat

Answer»

`K=rxxc^(2)`
`k=rxxc`
`k=(C)/(R)`
`k=(r)/(c)`

ANSWER :D
Discussion
18898.

Which of the following aldehyde contains alpha-C atom but does not have any alpha-H atom ?

Answer»

Propionaldehyde
Benzaldehyde
Isobutyraldehyde
Formaldehyde

Answer :B
Discussion
18899.

The treatment of alkyl chlorides with aqueous KOH leads to the formation of alcohols but in presence of alcoholic KOH, alkenes are the major products. Explain why?

Answer»

Solution :In aqueous solution, KOH is ALMOST completely ionized to give `OH^-` ions which being a strong nucleophile brings about a substitution reaction on alkyl halides to form alcohols. Further in the aqueous solution, `OH^(-)` ions are highly solvated (hydrated). this solvation REDUCES the basic character of `OH^(-)` ions which, therefore, fail to abstract a hydrogen from the `beta`-CARBON of the alkyl chloride to form an alkene.
In contrast, an alcoholic solution of KOH contains alkoxiide `(RO^(-))` ions which being a much stronger base than `OH^(-)` ions PREFERENTIALLY eliminates a molecule of HCL from an alkyl chloride to form alkenes.
Discussion
18900.

The standard oxidation potentials of the electrodes Ag//Ag^(+), Sn//Sn^(2+), Ca//Ca^(2+), Pb//Pb^(2+) are -0.8, -1.36, 2.86 and 10.12 V respectively. The most powerful oxidizing agent amont these metals ios

Answer»

Pb
Ca
Sn
Ag

ANSWER :D
Discussion