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23051.

Write short note on the following : Write the equation involved in the termite process.

Answer»

SOLUTION :`Cr_(2)O_(3) + 2AL RARR Al_(2)O_(3) + 2Cr`
`3Mn3O_(4) + 8Al rarr 4Al_(2)O_(3) + 2Cr`
Discussion
23052.

What happens when PCl_5 is heated ?

Answer»

Solution :`PCl_5` has three EQUATORIAL (202 pm long) and TWO axial (240 pm long) bonds. Axial bonds are weaker than equatorial bonds due to GREATER repulsions as they are comparatively nearer. When `PCl_5`, is heated, the LESS stable axial bonds BREAK to form `PCl_3`.
`PCl_5 overset("Heat")to PCl_3 + Cl_2`
Discussion
23053.

Which solution has the highest vapour pressure in identical condition ?

Answer»

`0.1 M FeCl_(3)`
`0.1 M BaCl_(2)`
0.1 M NACL
0.1 M UREA

Answer :D
Discussion
23054.

When a reaction is progressing

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The rate of the reaction goes on increasing
The concentration of the PRODUCTS goes on decreasing
The concentration of the reactants goes on decreasing
The reaction rate ALWAYS remain CONSTANT

Solution :As reaction PROGRESSES the concentration of the reactants decreases and the concentration of the product INCREASES .
Discussion
23055.

Which nitro compound will show tautomerisum :

Answer»

`C_6H_5NO_2`
`(CH_3)_3CNO_2`
`CH_3CH_2NO_2`
NONE of the above

Answer :C
Discussion
23056.

When monochromatic X-rays are allowed to fall on some lighter element, the scattered X-rays have wavelengths larger than incident rays. This effect is know as:

Answer»

PHOTOELECTRIC effect
Zeeman effect
Stark effect
Compton effect

Answer :D
Discussion
23057.

Write Nernst equation for the reaction : 2Cr(s)+3Fe^(2+)(aq)to2Cr^(3+)(aq)+3Fe(s)

Answer»

Solution :`{:(2Cr(s)to2Cr^(3+)(AQ)+6e),(3Fe^(2+)(aq)+6eto3Fe(s)),(_),(2Cr(s)+3Fe^(2+)(aq)to2Cr^(3+)(aq)+3Fe(s)),(_):}`
Nernst equation is `E_("cell")=E_("cell")^(@)+(0.0591)/(6)LOG""([Fe^(2+)]^(3))/([CR^(3+)]^(2))`
`=(n=6)`
Discussion
23058.

Which one of the following is not an essential anino acid?

Answer»

VALINE
LEUCINE
LYSINE
Alanine

Answer :D
Discussion
23059.

When aqueous solution of salt of a saturated carboxylic acid is electrolysed, we get :

Answer»

Alcohol
Ethylene
Acetylene
Alkane

Answer :D
Discussion
23060.

When water is added in conc. H_2SO_4 the reaction is exothermic because :

Answer»

`H_2SO_4` is viscous
Hydrates of `H_2SO_4` are FORMED
`H_2SO_4` is corrosive
None

Answer :B
Discussion
23061.

Verdigris is :

Answer»

BASIC COPPER acetate
Basic LEAD aceate
FERROUS AMMONIUM sulphate
Potassium ferrocyanide

Answer :A
Discussion
23062.

Which of the following is Stephen's reducing agent ?

Answer»

`B_(2)H_(6)`
`Zn+NH_4Cl`
`SnCl_(2)+HCL`
`Pd-BaSO_(4)+` quinoline

Answer :C
Discussion
23063.

What is the solubility of Mg(OH)_2 in mole per litre if K_p = 1.0 xx 10^-11 ?

Answer»

`2..46xx10^(-14)`
`1.36xx10^(-4)`
`2.60xx10^(-7)`
`1.2xx10^(-10)`

Answer :B
Discussion
23064.

Why antacids should not be given along with other drugs?

Answer»

SOLUTION :Antacids should not be given along with other DRUGS particularly tetracycline antibiotics since they SLOW down their ABSORPTION.
Discussion
23065.

Which of the following statements about anhydrous aluminium chloride is/are incorrect ?

Answer»

It exists as `AlCl_(3)` MOLECULE in GASEOUS phase
It is a strong Lewis base
It SUBLIMES at `100^(@)C` under vacuum
It is not EASILY hydrolysed

Solution :N//A
Discussion
23066.

The structural formula of a compound is CH_3 - CH = C = CH_2. The type of hybridisation at the four carbon atoms from left to right:

Answer»

`SP^2, sp, sp^2, sp^3`
`sp^2, sp^3, sp^2, sp`
`sp^3, sp^2, sp,sp^2`
`sp^3, sp^2, sp^2, sp^2`

ANSWER :C
Discussion
23067.

Which of the following 0.1M aqueous solution will have the lowest f.p. ?

Answer»

`K_(2)SO_(4)`
`NACL`
Urea
Glucose

Answer :A
Discussion
23068.

The removal of impurities from an ore by forming molten mass is called

Answer»

CALCINATION
LEVIGATION
Slagging
Refining

Answer :C
Discussion
23069.

To an evacuated vessel with movable piston under external pressure of 1 atm 0.1 mole of He and 1.0 mole of an unknown compound vapour pressure 0.68 atm at 0^(@)C are introduced Considering the ideal gas behaviour the total volume (in litre) of the gases at 0^(@)C is close to .

Answer»


ANSWER :7
Discussion
23070.

Which of the following possesses an sp-hybridised carbon in its structure:

Answer»

`C Cl_2 = C Cl_2`
`CH_2 = C = CH_2`
`CH_2 = CH - CH - CH_2`
`CH_2 = C CL - CH = CH_2`

ANSWER :B
Discussion
23071.

This 'X' is ………….. .

Answer»




NONE of these

SOLUTION :Hydro boration - Anti markownikoff PRODUCT i.e., `CH_(3) - CH_(2) - CH - CH_2 -CH_2-OH`
Discussion
23072.

Write the Nernst equation for a metal electrode and for a non-metal electrode.

Answer»


ANSWER :
Discussion
23073.

X + Y X and Y are:

Answer»




all of these

Answer :B::C
Discussion
23074.

What is Reverse Osmosis? Mention its one partical utility.

Answer»

SOLUTION :The PROCESS of solvent molecule from solution to solvent through semipormiable membrane if EXCESS pressure applied on the solution side GREATER than osmotic pressure is called reverse osmosis USED in desolination of sea water.
Discussion
23075.

Unit of equilibrium constant for the reversible reaction H_(2)+I_(2)hArr2HI is

Answer»

`mol^(-1)` LITRE
`mol^(-2)` litre
mol `litre^(-1)`
None of these

Solution :Unit of `K_(p)=(ATM)^(Deltan)`
Unit of `K_(C)=("mole/litre")^(Deltan)`
`=["mole/litre"]^(0)=0`
Discussion
23076.

Which of the following paris is an intensive property?

Answer»

DENSITY, viscosity
Surface tension, mass
Viscosity, internal energy
Heat CAPACITY, VOLUME

Answer :A::C::D
Discussion
23077.

Which ofthe following alkenes will give same product by any method out of hydration, hydroboration -oxidation and oxymercuration-demercuration-

Answer»

`CH_3CH=CH_2`
`CH_3CH=CHCH_3`
`CH_3underset(CH_3)UNDERSET(|)(CH)CH=CH_2`

Solution :`CH_(3)CH=CHCH_(3)` is symmetrical and gives same PRODUCT by any of the GIVEN methods adopted.
Discussion
23078.

Writeionicequation for thhe reactionbetween Cr_(2) O_(7)^(2-) ionsand Fe^(2+) ions inacidicmedium .

Answer»

Solution :`Cr_(2) O_(7)^(2-) + 14H^(+)+ 6Fe^(2+) to`
`2Cr^(3+)+ 6Fe^(3+) + 7H_(2) O`
Discussion
23079.

Which of the following acts as an antioxidant in edible oils?

Answer»

Vitamin B
Vitamin C
Vitamin D
Vitamin E

Solution :Vitamin Eis an antioxidantpresentin ebible OILS.
Discussion
23080.

Which one is least basic

Answer»

`NI_(3)`
`NCl_(3)`
`NBr_(2)`
`NF_(3)`

ANSWER :D
Discussion
23081.

Which of the following solutions has the maximum pH value ?

Answer»

SOLUTION of CAUSTIC soda
Pure water
Water SATURATED with `CO_2` gas
Solution of SODIUM chloride

Answer :A
Discussion
23082.

The standard Potentials at 25^@C for the half reactions are given against them below:Zn^(2+) + 2e^(-) to Zn,E^@ = -0.762VMg^(2+) + 2e^(-) to Mg, E^@ = -2.37VWhen Zn dust is added to a solution of MgCl_2

Answer»

Magnesium is PRECIPITATED
ZINC dissolves in the solution
Zinc chloride is formed
No REACTION takes place

Answer :D
Discussion
23083.

Which of the following compounds will not undergo Friedal-Craft's reaction easily :

Answer»

NITROBENZENE
TOLUENE
CUMENE
XYLENE

ANSWER :A
Discussion
23084.

Which one of the following pairs represents stereoisomerism

Answer»

Chain isomerism and ROTATIONAL isomerism
Structural isomerism and geometric isomerism
Linkage isomerism and geometric isomerism
Optical isomerism and geometric isomerism

Solution :When ISOMERS have the structural formula but differ in the relative ARRANGEMENT of atoms of groups in space with in the molecule, these are known as stereoisomers and the phenomenon as stereisomerism. Stereoisomerism is of THREE TYPES (i) Geometrical isomerism (ii) Optical isomerism (iii) Conformational isomerism.
Discussion
23085.

Why are halogens strong oxidizing agents?

Answer»

Solution :Halogens have a strong electron accepting tendency due to low bond dissociation enthalpy, high ELECTRONEGATIVITY and large negative electron GAIN enthalpy.
`X +e^(-) rarr X^(-)`
So, they easily oxidize VARIOUS substances and are good OXIDIZING agents.
Discussion
23086.

Which of the following is not an electrophile ?

Answer»

`^o+CH_5`
`^o+NO_2`
`BF_3`
`CH_3C^o+O`

ANSWER :A
Discussion
23087.

[X]+H_(2)SO_(4)to[Y] a colourless gas with irritating smell, [Y]+K_(2)Cr_(2)O_(7)+H_(2)SO_(4)to green solution.[x] and [Y] are

Answer»

`SO_(3)^(2-)`,`SO_(2)`
`Ci^(-)`,HCL
`S^(-)`,`H_(2)S`
`CO_(3)^(2-)`,`CO_(2)`

SOLUTION :`SO_(2)` and `H_(2)S` both being reducing agents, can turn acidified dichromate solution green. `SO_(2)` can be obtained by the action of acid upon sulphite while `H_(2)S` is evolved by the action of acid upon sulphide. However, `SO_(2)` has a burning sulphur smell which is IRRITATING. `H_(2)S` has rotten EGG like smell.
Hence, (A) is the correct answer.
Discussion
23088.

Which of the following gas gives brown ppt. with Nessler's reagent ?

Answer»

`NO_2`
`SO_2`
`CO_2`
`NH_3` .

SOLUTION :`NH_3` GIVES brown PPT with Nessler.s reagent
`2K_2HgI_4 + NH_3 + 3KOH to UNDERSET("Brown ppt.")(H_2NHgO.HgI) + 7KI + 2H_2O`
Discussion
23089.

Which element has higher charge density?

Answer»

O
S
Se
Po

Answer :A
Discussion
23090.

Which of the following is/are not associated with rubber

Answer»

Conducting NATURE
Oriented nature
Elastic nature
Commercially avialable STRONG fibre

Solution :Rubber is elastic in nature. It is non-conducting and does not have well orientation. HENCE choies (a),(b) and (d) are correct while (c) is incorrect because rubber POSSESSES this property.
Discussion
23091.

When a solution of AgNO_3 (0.5 M) is electrolyzed using platinum anode and cathode. Then the products obtained at two elctrodes are

Answer»

CU at ANODE AD Ag at cathode
`o_2` at anode and Cu at cathode
`o_2` at anode and Ag at cathode
`NO_2` at anode and Ag at cathode

Answer :C
Discussion
23092.

Give an example for thermosetting polymer.

Answer»

POLYTHENE
PVC
Neoprene
BAKELITE

ANSWER :D
Discussion
23093.

The species that cannot exist is

Answer»

`SiF_(6)^(2-)`
`BF_(6)^(3)`
`SF_(6)`
`AIF_(6)^(3-)`

Answer :B
Discussion
23094.

Which of the following does not undergo disproportionation with conc.KOH

Answer»

` CH_3CHO`
` HCHO`
` C_6H_5CHO`
CHLORAL

ANSWER :A
Discussion
23095.

Which of the following is most electropositive

Answer»

YB
LU
SM
Dy

Answer :C
Discussion
23096.

Which of the following compounds on electrolysis produces hydrogen-

Answer»

DIL. `H_(2)SO_(4)`
dil. SOLUTION of NaOH
Ba`(OH)_(2)` solution
KOH solution

Answer :C
Discussion
23097.

Which of the following inert gas liquifies easily

Answer»

Kr
He
Ne
Ar

SOLUTION :The maximum TEMPERATURE at which gas can be LIQUIFIED is calle its critical temperature. The gas which have high boiling point will change into liquid first and so critical temperature of the gas will be more .
`T_(C) propB.P.` and `B.P. prop ` molecular weight
So Kr liquified first.
Discussion
23098.

Which of the followng electrolytes will have maximum coagulating value for AgI//Ag^(+)sol?

Answer»

`Na_(2)SO_(4)`
`Na_(3)PO_(4)`
`Na_(2)SO_(4)`
`NaCl`

Solution :`AgI|Ag^(+)` is positively CHARGED SOL. Electrolyte whose negative ion (anion) has least negative charge will require maximum amount and hence willhave maximum coagulationg VLAUE. Hence, `Cl^(-)` (i.e., NaCl) will have maximum COAGULATING value (coagulating power will be maximum for `PO_(4)^(3-),i.e., Na_(3)PO_(4).`
Discussion
23099.

Write tests of distinguish between : (i) CH_(3)CHO and C_(6)H_(5)CHO.

Answer»

SOLUTION :`CH_(3)CHO` gives brick red ppt with Fehling, `C_(6)H_(5)CHO` not.
Discussion
23100.

Which of the following compounds will form significant amount of meta product during mono-nitration reaction ?

Answer»




ANSWER :B
Discussion