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22201.

What volume of 0.1N HNO_(3) solution can be prepared from 6.3" g of " HNO_(3) ?

Answer»

1 LITRE
2 LITRES
`0.5` litres
5 litres

ANSWER :a
Discussion
22202.

When sodium salt of benzoic acid is heated with sodalime produces_____.

Answer»


ANSWER :BENZENE
Discussion
22203.

Which of the following combination is correct for concentration cell?

Answer»

I,III,Q
II,IV,P
III,I,R
IV,Q,S

Answer :A
Discussion
22204.

What is the decreasing order of strength of bases?

Answer»

`CH_(3)-CH_(2)^(-)gtNH_(2)^(-)gtH-C C^(-)GT OH`
`H-C=C^(-) gt CH_(3-)-CH_(2)^(-) gt NH_(2)^(-)2gt OH`
`OH gt NH_(2)^(-) gt H-C=C^(-) gt CH_(3)-CH_(2)^(-)`
`NH_(2)^(-) gtH-C=C gt OH^(-):gt CH_(3) -CH_(2)^(-)`

ANSWER :A
Discussion
22205.

Which of the following amine is a hormone released into the blood stream when an animal sences danger ?

Answer»

Andrenaline
Dopamine
Amphetamine
Novocaine.

Solution :Andrenaline-a hormone is released into the blood steam when an ANIMAL senses DANGER. It causes an INCREASE in blood PRESSURE and widening of PASSAGES of the lungs. All these efects prepare the animal to fight or to free.
Discussion
22206.

Which sterilises water ?

Answer»

`CO_2`
`O_3`
`N_2`
`SO_3`

SOLUTION :`O_3` is a GOOD STERILIZING AGENT
Discussion
22207.

Write down the reactions which occur in upper, middle and lower zones in the blast furnace during the extraction of iron from iron ore.

Answer»

Solution :Reactions in upper zone (1070 K)
`{:(3Fe_(2)O_(3)+CO to 2Fe_(3)O_(4)+CO_(2)),(Fe_(3)O_(4)+4CO to 3Fe+4CO_(2)),(CaCO_(3) to CaO+ CO_(2)),(CaO +SiO_(2) to CaSiO_(3) "(SLAG) "):}`
Reactions in middle zone (1270 K)
`{:(C+CO_(2) to 2CO),(FeO +C to Fe +CO):}`
Reactions in lower zone (1570 K)
`{:(C+O_(2) to CO_(2)), (FeO +C to Fe +CO):}`.
Discussion
22208.

Thermosetting polymer is a :

Answer»

BAKELITE
Polythene
Polyester
Buna-N

Answer :A
Discussion
22209.

Which of the following sulphate is insoluble in water ?

Answer»

`CuSO_(4)`
`CdSO_(4)`
`PbSO_(4)`
`Bi(SO_(4))_(3)`

SOLUTION :As `Bi(SO_(4))_(3)` is a COVALENT COMPOUND with high lattice ENERGY and hence it is insoluble in water.
Discussion
22210.

Which of the following is incorrect for H_(3)BO_(3)

Answer»

It has a layer structure in which `H_(3)BO_(3)` units are joined by hydrogen bonds
It is obtained by TREATING borax with conc. `H_(2)SO_(4)`
It does not act as a PROTON donor but acts as an acid by accepting hydroxyl ions
None of these

Answer :D
Discussion
22211.

Which is true in the case of [Fe(CN)_6]^(3-) complex:

Answer»

`d^2sp^3-hybridisation of Fe
Paramagnetic
One UNPAIRED electron
All are correct

Answer :D
Discussion
22212.

Which of the following processes is not responsible for the presence of electric charge on the sol particles ?

Answer»

Electron capture by sol particles
Adsorption of IONIC species from SOLUTION.
FORMATION of Helmholtz electrical DOUBLE layer.
ABSORPTION of ionic species from solution.

Solution :Absorption of ionic species from solution.
Discussion
22213.

The standard electrode potential of Zn^(2+)|ZnandCu^(2+)|Cu are - 0.76 and 0.34 V respectively . The standard e.m.f. of the cell is :

Answer»

0.42 V
`-1.10 V`
ZERO
`1.10 V`.

SOLUTION :`E^(@)_("CELL")=E^(@)_("CATHODE")-E^(@)_("anode")``=0.34-(-0.76)=1.10V`.
Discussion
22214.

Which of the following is not lyophillic

Answer»

GELATIN SOL
Silver sol
Sulphur sol
`As_(2)S_(3)` sol

ANSWER :B::C::D
Discussion
22215.

Which of the following describes the halogen element ?

Answer»

They are monoatomic and FORM ion of the types `X^(-)`
They are diatomic and form ion of type `X^(+)`
They are diatomic and form ion of the type `X^(-)`
They are polyatomic and form ion of the type `X^(_)`

SOLUTION :Halogens valency shell CONTAIN SEVEN electrons they one electron to form octet configuration EXHIBIT `X^(-)` & form diatomic
Discussion
22216.

The relation between the nucleotide triplets and the amino acids is called :

Answer»

GENE
GENETIC CODE
REPLICATION
Enzymes.

Answer :B
Discussion
22217.

Which have octahedral shape (d^(2)sp^(3)) hybridisation of central atom :

Answer»

`[CR(NH_(3))_(6)]^(+)`
`[FE(CN)_(6)]^(3-)`
`[Cu(NH_(3))_(6)]^(+)`
NONE of these

Solution :`[Cr(H_(2)O)_(6)]^(3+)` and `[Ni(CN)_(4)]^(2-)` are octahedral, but `sp^(3)d^(2)` hybridised.
Discussion
22218.

Which of the following hormones is produced under the conditions of stress which stimulate glycogenolysis in the liver of human beings ?

Answer»

THYROXINE
Insluin
ADRENALINE
ESTRADIOL

SOLUTION :Adrenaline.
Discussion
22219.

Which is not an acid salt ?

Answer»

`NaH_2PO_2`
`NaH_2PO_4`
`Na_3HP_2O_6`
`Na_4P_2O_7`

ANSWER :D
Discussion
22220.

The shape of blue gold sol (or) Fe(OH)_(3) sol is ..............

Answer»

SOLUTION :DISC or PLATE LIKE
Discussion
22221.

What are interhalogencompounds ? Giveexamples .

Answer»

Solution :Each halogen combines with other halogens to form a SERIES of compounds CALLED interhalogen compounds. For example, Fluorine reacts READILY with oxygen and FORMS difluorine oxide `(F_(2)O)` and difluorine dioxide `(F_(2)O_(2))`.
Discussion
22222.

What is difference between minerals and ores ?

Answer»

SOLUTION :
Discussion
22223.

Which of the following will respond to positive chromyl chloride test?

Answer»

`CuCl_(2)`
`ZnCl_(2)`
`HgCl_(2)`
None of these

Solution : Ionisable CHLORIDE require
Discussion
22224.

Which of the following molecules have dipole moment ?(i) BeF_(2) ""(ii)BF_(3) ""(iii) NF_(3) ""(iv) H_(2)S

Answer»

1. (i) and (iii)
2. (iii) and (iv)
3. (II) and (iii)
4. only (iii)

ANSWER :B
Discussion
22225.

Which of the following in/are inner orbital complex(es) as well as diamagnetic in nature? [ Atomic Number : Cr=24, Mn=25, Fe=26, Co=27]

Answer»

`[Zn(NH_(3))_(6)]^(2+)`
`[Ni(NH_(3))_(6)]^(2+)`
`[Cr(NH_(3))_(6)]^(3+)`
`[Co(NH_(3))_(6)]^(3+)`

ANSWER :D
Discussion
22226.

What is the function of testosterone ?

Answer»

Solution : Testosterone is responsible for development of SECONDARY MALE CHARACTERISTICS like deep voice, FACIAL hair and general PHYSICAL constitution.
Discussion
22227.

Which of the following is/are correct? (I) If liquid "kryptonite"(from Superman's home planet), wilth a denisty twice that of mercury is used in a barometer on earth, one standard atmosphere of pressure would sport a column of mercury 380 mm in height. II. At constant volume and number of moles of gas, the pressure exhibited by an ideal gas is directly proportional to its absolute temperature. III At standard temperature and pressure (STP), the volume of a mixture of gases containing 0.400 mole H_(2), 0.600 mole N_(2) and 1.00 mole of O_(2) is 44.8L and the mole fraction of N_(2) is 0.300.

Answer»

Only II
Only III
II and III
All are correct

Answer :D
Discussion
22228.

What is the free energy change (DeltaG) When 1.0 mole of water at 100^(@)C and 1 atm pressure is convertedinto steam at 100^(@)C and 1 atm pressure?

Answer»

`80 CAL`
`540 cal`
`620 cal`
zero

Solution :N//A
Discussion
22229.

Which curve does not represent Boyle’s law

Answer»




ANSWER :C
Discussion
22230.

Which one of the following is a hetroleptic complex ?

Answer»

`[Pt(NO_(2))(H_(2)O)(NH_(3))_(2)]Br`
`[NI(CO)_(4)]`
`[Co(NH_(3)_(6)]Cl_(3)`
`K_(4)[Fe(CN)_(6)]`

Answer :A::B::C
Discussion
22231.

Which pair of electrolytes give different products at anode

Answer»

1M ` CuSO_4` SOLUTION ` 1M CuCl_2` solution
`1M KCL` solution `1M Cu(NO_3)_2` solution
`1M AgNO_3` solution 1 M `CuSO_4` solution
`1MCuBr_2` solution ` 1M CuSO_4` solution

Solution :`AQ Cu(NO_3)_2 to O_2 , aq CuSO_4 to O_2 , aq CuCl_2 to Cl_2`
` aq KCl to Cl_2 , aq AgNO_3 to O_2 , aq CuBr_2 to Br_2`
Discussion
22232.

The short hand configuration of Cu(Z=29)is:

Answer»

`3d^94s^2`
`3d^8,4s^2`
`3d^10,4s^1`
None

Answer :C
Discussion
22233.

Which of the following elements are necessary for maintaining fluid balance in the body:

Answer»

CALCIUM and magnesium
Potassium and sodium
Iron and magnesium
None of the above

Answer :B
Discussion
22234.

The vapour pressure of a solvent decreases by 10 mm of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction or the solvent if the decrease in vapour presssure is to be 20 mm of mercury?

Answer»

0.8
0.6
0.4
0.4

Solution :`Deltap//p^(@)=x_(2)," HENCE, "Deltap//Deltap'=x_(2)//x_(2)'.i.e., 10//20`
`=0.2//x_(2)'or x_(2)'=0.4." Hence, "x_(1)'=1-0.4=0.6.`
Discussion
22235.

Which of the following compound has highest boiling point ?

Answer»

Butan-2-ol
Butan-1-ol
Pentan-1-ol
Propan-1-ol

Answer :C
Discussion
22236.

which is used for sterilization of water in water supply system of cities?

Answer»

Chlorine
Sulphurdioxide
Pitassium permaganate
DDT

Answer :B
Discussion
22237.

Which of the following substances has giant colvent structure

Answer»

Iodnine crystal
SOLID `CO_(2)`
Silica
White PHOSPHOROUS

SOLUTION :Silica has tendency to form long chain COVALENT structure such as carbon so it has giant covalent structure.
Discussion
22238.

The shape of all tetrafluorides of group 16 is

Answer»

PYRAMIDAL
Linear
TRIGONAL bipyramidal
TETRAHEDRAL

Solution :Trigonal bipyramidal because of `sp^3d` HYBRIDISATION
Discussion
22239.

Which one of the following elements constitutes a major impurity in pig iron ?

Answer»

Silicon
Oxggen
Sulphur
Graphite

Answer :D
Discussion
22240.

Which aqueous solution has minimum freezing point ?

Answer»

0.01 M NaCl
0.005 M`C_2H_5OH`
0.005 M `Mgl_2`
0.005 M `MgSO_4`

ANSWER :A
Discussion
22241.

Write the name of two important kinds of holes normally encountered in a closed packed structure. How many such holes are present per sphere in a close packed arrangement?

Answer»

Solution :Tetrahedral hole and OCTAHEDRAL hole. Two tetrahedral HOLES are PRESENT and one octahedral hole is present PER sphere in a PACKED sphere.
Discussion
22242.

The reason for the stability of Gd^(3+) ion is

Answer»

4f SUB shell half-filled
4f sub shell completely filled
possesses the electronic CONFIGURATION of NOBLE gases
4f sub shell empty

Solution :`Yb GT Eu gt Lu gt GD gt Ce`
Discussion
22243.

Which of the following molecules/ions has pyramidal shape?

Answer»

`SO_3`
`NH_4^+`
`PCl_3`
`H_2O`

ANSWER :C
Discussion
22244.

What are DeltaG, DeltaH and Delta S for addorption of gas on solid adsorbent ?

Answer»

SOLUTION :`DeltaG=-ve, DELTA S =-ve, DeltaH=-ve.`
Discussion
22245.

Which one of the following ions is the most stable in aqueous solutions ? (At. No. Ti=22, V=23, Cr= 24 , Mn = 25)

Answer»

`Mn^(2+)`
` Cr^(3+)`
`V^(3+)`
`Ti^(3+)`

Solution :Out of the given species, `Cr^(3+)` has the highest negative REDUCTION potential.Hence, it cannot be reducedto `Cr^(2+)` and, THEREFORE, is the most stable ion in aqueous solution.
ALTERNATIVELY,
`Mn^(3+) = [ AAr] 3d^(4) , Cr^(3+)= [AR]3d^(3)`
`V^(3+) =[Ar]3d^(2)Ti ^(3+) = [ Ar] 3d^(1)`
In `Cr^(3+)`, all three d electrons enter intolower energy `t_(2g)` orbitals. The lowering of energy is MAXIMUM and hence stability is maximum.
Discussion
22246.

Which order of arrangement is correct in terms of the strength of the acid

Answer»

`CH_(3)-CH_(2)COOHgtCH_(3)COOHltHCOOHltClCH_(2)COOH`
`ClCH_(2)COOHltHCOOHltCH_(3)COOHltCH_(3)CH_(2)COOH`
`CH_(3)-CH_(2)COOHltCH_(3)COOHltHCOOHltClCH_(2)COOH`
`HCOOHgtCH_(3)CH_(2)COOHltCH_(3)COOHgtClCH_(2)COOH`

ANSWER :C
Discussion
22247.

The solubility product of AgCl under standard conditions of temperature is given by

Answer»

`1.6 XX 10^(-5)`
`1.5 xx 10^(-8)`
`3.2 xx 10^(-10)`
`1.5 xx 10^(-10)`

ANSWER :D
Discussion
22248.

Which transition metal ion is diamagnetic ?

Answer»

`CO^(2+)`
`NI^(2+)`
`CU^(2+)`
`ZN(2+)`

Answer :D
Discussion
22249.

Which one of the following shows highest magnetic moment?

Answer»

`FE^(2+)`
`Co^(2+)`
`Cr^(3+)`
`Ni^(2+)`.

Solution :Larger the number of unpaired electrons, HIGHER is the magnetic moment.
No. of unpaired electrons:
`Fe^(2+):[Ar]3d^(6)=4`
`Co^(2+):[Ar]3d^(7)=3`
`Cr^(3+):[Ar]3d^(3)=3`
`Ni^(2+):[Ar]3d^(8)=2`
Discussion
22250.

Total number of solution from the following which has pHlt7 at 25^(@)C. (K_(a)CH_(3)COOH=1.8xx10^(-5),K_(b)NH_(4)OH=1.8xx10^(-5)) (i) 10^(-8) MHCl (ii) 0.01 M solution of NH_(4)Cl (iii) 0.01 M solution of CH_(3)COONa (iv) 0.01M solution is B(OH)_(3) (v) 0.01M solution of CH_(3)COONH_(4)

Answer»


SOLUTION :(i) `10^(-8)MHCl`
(ii) `0.01 M` solution of `NH_(4)Cl`
(III) `0.01 M` solution of `B(OH)_(3)`
Discussion