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4851.

What are the secondary valencies ?

Answer»

Solution :These are the valencies which the metal atom or cation shows TOWARDS ligands in the FORMATION of its. complex ions.
Examples:(i) In `[Cu(NH_3)]^(2+)` the secondary VALENCY of Cu is 4 (II) In `Co(NH_3)_3Cl_3]` the secondary valency of cobalt is equal to 6.
Discussion
4852.

The reduction electrode potential E , or 0.1 M solution of M^(+) ions (E_(RP)^(@) = -2.36 V) is

Answer»

`-2.41`
`+2.41`
`- 4.82`
NONE

SOLUTION :`E = E_(SRP)^(@) + (0.0592)/(2) log_(10) 0.1`
`= -2.36 + 0.0592 xx (-1) = -2.41 V`
Discussion
4853.

Write the IUPAC name of the HO - CH_2- underset(OH) underset(|)CH-CH_2 - OH

Answer»

SOLUTION :Propane-1,2,3-triol
Discussion
4854.

Which of the following is not addition polymer ?

Answer»

POLYPROPENE
teflon
polyacrylonitrile
melamine FORMALDEHYDE POLYMER

ANSWER :D
Discussion
4855.

Two liquids A and B have vapour pressure in the ratio P_A^@ : P_B^@=1:3at a certain temperature. Assume A and B form an ideal solution and the ratio of mole fractions of A to B in the vapour phase is 4:3.Then the mole fraction of B in the solution at the same temperature is :-

Answer»

`1/5`
`2/3`
`4/5`
`1/4`

SOLUTION :`y_A/y_B=(P_A^@x_A)/(P_B^@x_B)`
`4/3=1/3xx x_A/x_B, x_A + x_B =1`
`x_A=4x_B`
`x_B=1//5`
Discussion
4856.

What are the physical states of dispersed phase and dispersion medium of froth.

Answer»

Solution :DISPERSED phase : gas.
DISPERSION medium : LIQUID.
Discussion
4857.

Why cation vacancies in some crystals make them good catalysts?

Answer»

SOLUTION :Compounds of transition metals have metal deficiency defect due to MISSING metal ions from some of the lattice SITES. The charge is balanced by an adjacent ion having higher charge which LEADS to increase in chemisorption.
Discussion
4858.

Who modified Bohr's theory for introducing elliptical orbits for electron path?

Answer»

Hund
Thomson
Rutherford
Sommerferd

Answer :D
Discussion
4859.

What is meant by cyanohydrin ?

Answer»

SOLUTION :It is the product OBTAINED by the addition of HCN to a CARBONYL compound.
Discussion
4860.

What is done to reduce pollutionn by carbon monoxide or nitric oxide etc. formed furing combustion of fuels in automobiles ?

Answer»

SOLUTION :Catalytic convertors CONSISTING of transition METALS and their oxides are fitted into the automobile axhauts system. They HELP in oxidatin ofCO to `CO_(2)` and reduction ofNO to `N_(2)` which are harmless guses.
Discussion
4861.

The specific rotationof pure alpha and beta(D)glucose are …………… ,……….respectively.

Answer»

`18.7^(@),112^(@)`
`112^(@), 18.7^(@)`
`90^(@),90^(@)`
`120^(@),20^(@)`

ANSWER :B
Discussion
4862.

What are natural and synthetic polymers.

Answer»

Solution :Natural polymers. These are the complex compounds of high molecular MASS obtained from natural SOURCES, e.g., proteins, starch, CELLULOSE and natural rubber. Synthetic polymers. These are the man-made commercial polymer products having specified properties. For example, PLASTIC (polythene, PVC), synthetic rubber (Buna-S, Buna-N, Neoprene), synthetic fibres (nylon-6, 6, polyester).
Discussion
4863.

What is the action of bromine in the presence of sodium hydroxide on primary, secondary and tertiary nitroalkanes ?

Answer»

SOLUTION :(1) Primary nitroalkanes react with HALOGENS (Cl or Br) in the presence of alkali to give mono and di halonitroalkanes.
`underset(1^(@)"nitroalkane")(2R-CH_(2)-NO_(2))+2Br_(2)+2NAOH underset(-H_(2)O)overset(-NaBr)toR-underset(Br)underset(|)CH-NO_(2) underset("1,1-dibromonitroalkane")(underset({:(-NaBr),(-H_(2)O):})overset(Br_(2)//NaOH)to R-underset(Br)underset(|)overset(Br)overset(|)C-NO_(2))`
`underset("nitroethane")(2R-CH_(2))-NO_(2) underset({:(-NaBr),(-H_(2)O):})overset(Br_(2)//NaOH)to underset("bromonitroethane")(CH_(3)-underset(Br)underset(|)CH-NO_(2)) underset("1,1-dibromonitroethane")(underset({:(-NaBr),(-H_(2)O):})overset(Br_(2)//NaOH)to CH_(3)-underset(Br)underset(|)overset(Br)overset(|)C-NO_(2))`
Nitromethane gives a trihalogen derivative called chloropicrin.Chloropicrinis an IMPORTANT insecticide.
`underset("nitromethane")(CH_(3)NO_(2)+)3Cl_(2)+3NaOH to underset("chloropicrin")(C Cl_(3)NO_(2)+)3NaCl+3H_(2)O`
(2)Secondary nitroalkanes react with halogens (Cl or Br)in the presence of alkali to give monohalonitroalkanes.
`underset(2^(@)"Nitroalkane")(R_(2)CHNO_(2)) overset(Br//NaOH)to underset("monobromo derivative")(R-underset(R)underset(|)overset(Br)overset(|)C-NO_(2)+NaBr)+2H_(2)O`

`CH_(3)-underset(H)underset(|)overset(CH_(3))overset(|)C-NO_(2)overset(Br_(2)//NaOH)toCH_(3)-underset(Br)underset(|)overset(CH_(3))overset(|)C-NO_(2)+NaBr+2H_(2)O`
(3) Tertiary nitroalkanes do not react with bromine.
Discussion
4864.

Which of the following compounds will give butanone on oxidation with alkaline KMnO_(4) solution?

Answer»

Butan-1-ol
Butan-2-ol
Both of these
None of these

Answer :B
Discussion
4865.

Which of the following is an anionic detergent ?

Answer»

SODIUM dodecyl BENZENE sulphonate
Sodium palmitate
Cetyl TRIMETHYL AMMONIUM bromide
Sodium stearate

Answer :A
Discussion
4866.

Which of the following is incorrectly matched?

Answer»


ANSWER :2
Discussion
4867.

What is the hybridization of carbon atoms in fullerence?

Answer»

`SP^(3)`
SP
`SP^(2)`
`DSP^(3)`

Solution :In FULLERENCE, C undergo `sp^(2)` HYBRIDIZATION.
Discussion
4868.

What isthe major product of the following reaction ?

Answer»




ANSWER :C
Discussion
4869.

underset("X (optically active)")(C_(5)H_(13)N)underset(-N_(2))overset(Aq.NaNO_(2)//HCl)to underset("tertiary alcohol+some other products")(Y) (i) Identify (X) and (Y) (ii) Is (Y) optically active? (iii) Give structures of intermediate(s), if any, in the formation of (Y) from (X)?

Answer»

Solution :Step 1. To determine the structure of compound (X)
(i) Since compound (x) on treatment with `NaNO_(2)//HCl` evolves `N_(2)` gas, therefore, (X) MUST be a primary amine. Further since compound (X) is optically active, therefore, it must e contain a chiral carbon. Now `NH_(2)` group cannot be directly attached to the chiral carbon since such amines readily undergo racemization due to NITROGEN INVERSION. therefore, the structure of the compound X is
`underset("2-Methylbutanamine (X) (optically active)")(CH_(3)CH_(2)-overset(CH_(3))overset(|)(.^(**)C)H-CH_(2)NH_(2))`
Step 2. To determine the structure of tertiary alcohol (X)
The formation of compound (Y) from compound (X) may be explained as follows:

Thus, the compound (Y) is 2-methylbutan-2-ol. it is optically inactive.
Discussion
4870.

Which group has the highest + Inductive effect ?

Answer»

`CH_3^-`
`CH_3CH_2^-`
`(CH_3)_2CH^-`
`(CH_3)_3C^-`

ANSWER :D
Discussion
4871.

Which of the following plots does not represent the behaviour of an ideal binary liquid solutions?

Answer»

PLOT of `p_(A)`versus `x_(A)`(mole FRACTION of A in liquid phase)is linear
plot of `p_(B)`versus`x_(B)`is linear
Plot of `p_("total")`versue is (or`x_(B))`is linear
Plot of `p_("total")` versus`x_(A)`is non-linear

Solution :
`{:(X_(A)=1,X_(A)=0),(X_(B)=0,X_(B)=1):}`
So`P_(T)` and`X_(A)`is non-linear.
Discussion
4872.

The repeating unit in silicone is ……………..

Answer»

`SiO_(2)`
`-underset(R)underset(|)OVERSET(R)overset(+)(SI)-O-`
`R-O-underset(R)underset(|)overset(|)(Si)-O`
`-underset(R)underset(|)overset(|)(Si)-O-O-R`

Answer :B
Discussion
4873.

Write the formula of the following complexes : Dichlorotetraamminecobalt(III) ion

Answer»

Solution :Formulae of the COORDINATION compounds are GIVEN below :
`[CoCl_(2)(NH_(3))_(4)]^(+)`
Discussion
4874.

Which of the following is not involved in formation of photochemical smog?

Answer»

`NO`
`O_3`
`C_x H_y`
`SO_2`

SOLUTION :`SO_2` is INVOLVED in FORMATION of CLASSICAL SMOG.
Discussion
4875.

Which of the following expresion is true ?

Answer»

`Delta_(f)H^(@)(CO, g)=(1)/(2)Delta_(f)H^(@)(CO_(2),g)`
`Delta_(f)H^(@)(CO, g)= Delta_(f)H^(@)` (C, GRAPHITE) `+(1)/(2)Delta_(f)H^(@)(O_(2),g)`
`Delta_(f)H^(@)(CO, g)=Delta_(f)H^(@)(CO_(2), g)-(1)/(2)Delta_(f)H^(@)(O_(2), g)`
`Delta_(f)H^(@)(CO, g)=Delta_(c )H^(@)` (C, graphite) `- Delta_(c )H^(@)(CO, g)`

Answer :D
Discussion
4876.

Which of the following is not antacids?

Answer»

`AI(OH)_(3)`
`Na_(2)CO_(3)`
`NAHCO_(3)`
`MG(OH)_(2)`

ANSWER :B
Discussion
4877.

Why are detergents preferred over soaps ?

Answer»

Solution :SYNTHETIC DETERGENTS can be used in hard water as well as in acidic solution. The reason being that sulphonic ACIDS and their CALCIUM and magnesium salts are soluble in water but fatty acids and their calcium and magnesium salts are INSOLUBLE in water
Discussion
4878.

There is a gradual decrease in the size of atoms or M^(3+) ions across the series in actinoids. This is called _____________.

Answer»

SOLUTION :ACTINOID CONTRACTION
Discussion
4879.

Which of the following reaction is not representing major product ?

Answer»




ANSWER :B::C::D
Discussion
4880.

Z may not be:

Answer»

`CH_(3)-Cl`
`CH_(3)underset(CH_(3))underset(|)overset(H)overset(|)C-Cl`

ANSWER :D
Discussion
4881.

Which of the following organic compounds has same hybridisation asits combustion product (CO_2)-

Answer»

ethane
ETHYNE
ethene
ethanol

Solution :`C_(2)H_(2) + (5)/(2)O_(2) overset(DELTA)rarr 2CO_(2) + H_(2)O`
C-atom in both ethyne and `CO_(2)` is sp-hybridised.
Discussion
4882.

Which of the following alcohols yields corresponding alkyl chloride on reaction with conc. HCl + anhyd ZnCl_(2) at room temperature ?

Answer»

propane-1-ol
iso BUTYL ALCOHOL
2-methyl propan-1-ol
2-methyl butane-2-ol

Answer :D
Discussion
4883.

What are oligosaccharides ?

Answer»

Solution :Carbohydrates which on hydrolysis give `2-10` MOLECULES of monosaccharides are called oligosaccharides. For EXAMPLE , sucrose , RAFFINOSE , stachyrose , ETC.
Discussion
4884.

Veronal, a barbiturate drug is used as

Answer»

Antiseptic
Sedative
Anasethetic
NONE of these

Answer :B
Discussion
4885.

Vitamin A is known as :

Answer»

Axerophytol
THIAMINE
Riboflavin
Pyridoxin.

ANSWER :A
Discussion
4886.

When an electron jumps from L to K shell

Answer»

ENERGY is released
Energy is absorbed
Both (a) & (B)
NONE of these

Answer :A
Discussion
4887.

The smallest ketone and its next homologue are reacted with NH_(2)OH to form oxime.

Answer»

Two DIFFERENT OXIMES are formed
THREE different oximes are formed
Two oximes are optically active
All oximes are optically active

Answer :B
Discussion
4888.

Which type of classification of drugs useful for doctors ?

Answer»

PHARMACOLOGICAL work
Pharmacological EFFECT
Based on STRUCTURE of drug
Based on properties of drug 

SOLUTION :Pharmacological effect
Discussion
4889.

Which one is a main polymer of polyamide class ?

Answer»

Nylon-6,6
Nylon-6
(A) and (B) both
Terylene

SOLUTION :(A) and (B) both
Discussion
4890.

The resistance of a decinormal solution of an electrolyte in a conductivity cell was found to be 245 ohms. Calculate the equivalent conductivity of the solution if the electrodes in the cell were 2 cm apart and each had an area of 3.5 sq. cm.

Answer»


Solution :`kappa=Gxx(l)/(a)=(1)/(R)XX(l)/(a)=(1)/(245Omega)xx(2CM)/(3.5cm^(2))`
`wedge_(eq)=kappaxx(1000)/("Normality")=((1)/(245)xx(2)/(3.5)OMEGA^(-1)cm^(-1))xx(1000cm^(3)L^(-1))/(0.1molL^(-1))=23.32Omega^(-1)cm^(2)eq^(-1)`
Discussion
4891.

Xe reacts directly with

Answer»

`O_2`<BR>`Cl_(2)`
`F_2`
`Br_(2)`

ANSWER :C
Discussion
4892.

Which is stronger reducing agent Cr^(2+) or Fe^(2 +)?

Answer»

Solution :`Cr^(2+)` and `Fe^(2 +)`
Cr (Z = 24) ELECTRONIC configuration-`[Ar] 3d^(5) 4s^(1)`
`Cr^(2+)`Electronic configuration-`[Ar] 3d^(4) 4s^(0)`
Fe (Z = 26)Electronic configuration-`[Ar] 3d^(6) 4s^(2)`
`Fe^(2+)` Electronic configuration-`[Ar] 3d^(6)4s^(0)`
If standard electrode potential (E) of a METAL is large and NEGATIVE, the metal is a powerful reducing agent.
`Cr^(2+)+ 2e^(-) to CrE^(0) = -0.91V`
`Fe^(2+) + 2e^(-) toFeE^(0) = -0.44 V`
By comparing the above equation, `Cr^(2+)` is a powerful reducing agent.
Discussion
4893.

Which of the following is true about the value of refractive index of quartz glass?

Answer»

Same in all DIRECTIONS
Different in different directions 
Cannot be measured
Always zero 

Solution :QUARTZ GLASS is AMORPHOUS SOLID. Hence, there is no definite order of arrangement of constituent particles.
Discussion
4894.

Which of the following resonating structures is not correct for CO_(2) ?

Answer»

`UNDERSET(* *) OVERSET(* *)O = C= underset(* *)overset(* *)O`
`:underset(* *) overset(* *)C-O:`
`:overset(+)underset(* *)O-C-=overset(-) underset(* *)O:`
`:overset(+)O=C-overset(* ) underset(* *)O:`

SOLUTION :`:overset(+)underset(* *)O-C=overset(-) underset(* *)O:`
Discussion
4895.

The root mean square velocity of an ideal gas at constant pressure varies with density ( d ) as :

Answer»

`d^(2)`
d
`SQRT( d)`
`( 1) /( sqrt(d))`

ANSWER :A
Discussion
4896.

The total number of diprotic acids among the following is {:(H_(3)PO_(4),H_(2)SO_(4),H_(3)PO_(3),H_(2)CO_(3),H_(2)S_(2)O_(7)),(H_(3)BO_(3),H_(3)PO_(2),H_(2)CrO_(4),H_(2)SO_(3),):}

Answer»


Solution :`H_(2)SO_(4), H_(3)PO_(3), H_(2)CO_(3), H_(2)S_(2)O_(7), H_(2)CrO_(4), H_(2)SO_(3)`
All are diprotic ACIDS.
Discussion
4897.

When CI_(2)water is addedto an excess solnof KJ inpresence of CHCI_(3) a violet colouris obtained .ON addingmoreof water thevioletcolourdisatappearsand acolourlesssollutionis obtained.The testconformthe presence of

Answer»

`I^(THETA)`<BR>`Br^(Theta)`
`CI^(Theta)` PRESENT
`I^(Theta)` and `Br^(Theta)`

ANSWER :a
Discussion
4898.

Which group of the periodic table contains coinagemetal ?

Answer»

IIA
IB
IA
None of these

Solution :Cu,AG and Au are COINAGE metals. They belong to group IB (d-block) of periodic table.
Discussion
4899.

Which among the following is an example of Ferrous alloy

Answer»

WOOD's METAL
TYPE metal
LNVAR
Solder metal

Solution :lnvar
Discussion
4900.

Which among the following will give a precipitate with ammonical silver nitrate

Answer»

2-butene
2-butyne
Chlorobenzene
3-methyl-1-butyne

Answer :D
Discussion