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11801.

When chemical equilibrium is reached the :

Answer»

REACTION stops
RATE of forward reaction is equal to the rate of BACKWARD reaction
rate of forward reaction is more than that of backward reaction
NONE of the above

Answer :B
Discussion
11802.

Which of the following is a polymer?

Answer»

CARNAUBA wax
Carbowax
Beeswax
PARAFFIN wax

Solution :Carbowax is a polymer of ETHYLENE oxide. Whereas Carnuaba wax and Bees wax are esters of HIGHER fatty acids with higher alcohols while paraffin wax is a mixture of HYDROCARBONS containing 20 or more C-atoms.
Discussion
11803.

The role of phosphate in detergent powder is ............

Answer»

control pH LEVEL of the detergent water MIXTURE
REMOVE `Ca^(2+) and MG^(2+)`ions from water that causes HARDNESS of water
provide whiteness to the fabric
more soluble in soft water

Solution :remove `Ca^(2+) and Mg^(2+)`ions from water that causes hardness of water
Discussion
11804.

Which of the following is not a Bronsted acid?

Answer»

`CH_3NH_4^+`
`CH_3COO^-`
`H_2O`
`HSO_4^-`

SOLUTION :Those substance which GIVE a proton is called Bronsted ACID, while `CH_3COO^-` does n.t have a proton. So it is not a Bronsted acid.
Discussion
11805.

What happens whan external pressure applied on a solution becomes more than osmotic pressure ?

Answer»

SOLUTION :REVERSE OSMOSIS TAKES PLACE.
Discussion
11806.

Various combinations of n-type and p-type semiconductors are used for making electronic components. Diode is a combination of n-type and p-type semiconductors and is used as a rectifier. Transistors are made by sandwiching a layer of one type of semiconductor between two layers of the other type of semiconductor. npn and pnp type of transistors are used to detect or amplify radio or audio signals. The solar cell is an efficient photo-diode used for conversion of light energy into electrical energy. Germanium and silicon are group 14 elements and therefore, have a characteristic valence of four and form four bonds as in diamond. A large variety of solid state materials have been prepared by combination of groups 13 and 15 or 12 and 16 to simulate average valence of four as in Ge or Si. Typical compounds of groups 13 - 15 are InSb, AIP and GaAs, Gallium arsenide (GaAs) semiconductors have very fast response and have revolutionised the design of semiconductor devices. ZnS, CdS, CdSe and HgTe are examples of groups 12 - 16 compounds. In these compounds, the bonds are not perfectly covalent and the ionic character depends on the electronegativities of the two elements. 1. How are electronic components made ?

Answer»

SOLUTION :These are MADE by VARIOUS COMBINATIONS of n-type and p-type SEMICONDUCTORS.
Discussion
11807.

Various combinations of n-type and p-type semiconductors are used for making electronic components. Diode is a combination of n-type and p-type semiconductors and is used as a rectifier. Transistors are made by sandwiching a layer of one type of semiconductor between two layers of the other type of semiconductor. npn and pnp type of transistors are used to detect or amplify radio or audio signals. The solar cell is an efficient photo-diode used for conversion of light energy into electrical energy. Germanium and silicon are group 14 elements and therefore, have a characteristic valence of four and form four bonds as in diamond. A large variety of solid state materials have been prepared by combination of groups 13 and 15 or 12 and 16 to simulate average valence of four as in Ge or Si. Typical compounds of groups 13 - 15 are InSb, AIP and GaAs, Gallium arsenide (GaAs) semiconductors have very fast response and have revolutionised the design of semiconductor devices. ZnS, CdS, CdSe and HgTe are examples of groups 12 - 16 compounds. In these compounds, the bonds are not perfectly covalent and the ionic character depends on the electronegativities of the two elements. 4. Give some examples of group 12-16 that are used in semiconductor devices.

Answer»

Solution :`ZnS, CdS, CdSe and HgTe` are some EXAMPLES of COMPOUNDS USED in electronic COMPONENTS.
Discussion
11808.

Various combinations of n-type and p-type semiconductors are used for making electronic components. Diode is a combination of n-type and p-type semiconductors and is used as a rectifier. Transistors are made by sandwiching a layer of one type of semiconductor between two layers of the other type of semiconductor. npn and pnp type of transistors are used to detect or amplify radio or audio signals. The solar cell is an efficient photo-diode used for conversion of light energy into electrical energy. Germanium and silicon are group 14 elements and therefore, have a characteristic valence of four and form four bonds as in diamond. A large variety of solid state materials have been prepared by combination of groups 13 and 15 or 12 and 16 to simulate average valence of four as in Ge or Si. Typical compounds of groups 13 - 15 are InSb, AIP and GaAs, Gallium arsenide (GaAs) semiconductors have very fast response and have revolutionised the design of semiconductor devices. ZnS, CdS, CdSe and HgTe are examples of groups 12 - 16 compounds. In these compounds, the bonds are not perfectly covalent and the ionic character depends on the electronegativities of the two elements. 3. Name some compounds of groups 13-15 which have revolutionised semiconductor devices.

Answer»

Solution :InSb, ALP and GaAs are TYPICAL compounds of group 13-15. GALLIUM arsenide (GaAs) semiconductor devices have revolutionised the DESIGN of semiconductor devices.
Discussion
11809.

Various combinations of n-type and p-type semiconductors are used for making electronic components. Diode is a combination of n-type and p-type semiconductors and is used as a rectifier. Transistors are made by sandwiching a layer of one type of semiconductor between two layers of the other type of semiconductor. npn and pnp type of transistors are used to detect or amplify radio or audio signals. The solar cell is an efficient photo-diode used for conversion of light energy into electrical energy. Germanium and silicon are group 14 elements and therefore, have a characteristic valence of four and form four bonds as in diamond. A large variety of solid state materials have been prepared by combination of groups 13 and 15 or 12 and 16 to simulate average valence of four as in Ge or Si. Typical compounds of groups 13 - 15 are InSb, AIP and GaAs, Gallium arsenide (GaAs) semiconductors have very fast response and have revolutionised the design of semiconductor devices. ZnS, CdS, CdSe and HgTe are examples of groups 12 - 16 compounds. In these compounds, the bonds are not perfectly covalent and the ionic character depends on the electronegativities of the two elements. 2. What are the applications of npn and pnp types of transistors ?

Answer»

SOLUTION :These are USED to detect and AMPLIFY RADIO or AUDIO signals.
Discussion
11810.

When radium atom (belonging to group II) loses an alpha-particle forming a new element, the latter is placed in :

Answer»

IV GROUP
zero group
III group
I group.

Answer :B
Discussion
11811.

Write the stuctures of the following compounds : (i) alpha- Methoxypropionaldehyde (ii) 3- Hydroxybutant (iii) 2- Hydroxycyclopentanecarbaldehyde (iv) 4-Oxopentanal. (v) Di-sec butyl ketone (vi) 4 - Fluoroacetophenone.

Answer»

Solution :Structures of the COMPOUNDS are given below :
(i) `{:(""CH_(3)O""O),("|||"),(CH_(3)-underset(ALPHA)CH-C-H):}`
(II) `underset(4)CH_(3)-overset(OH)overset("|")underset("3")"CH"-underset(2)CH_(2)-overset(O)overset(||)underset(1)C-H`
(iii)
(IV) `underset(5)CH_(3)-overset(O)overset(||)underset(4)C-underset(3)CH_(2)underset(2)CH_(2)-overset(O)overset(||)underset(1)C-H`
(v) `CH_(3)-CH_(2)-overset(CH_(3))overset("|")"CH"-overset(O)overset(||)C-overset(CH_(3))overset("|")"CH"-CH_(2)-CH_(3)`
(vi)
Discussion
11812.

What is crosslinking in polymers ?

Answer»

Solution :Based on the structures, polymers are 3 types : Unbranched, branched and NETWORK polymers. Polymers containing strong covalent bonds between various linear CHAINS are called network polymers. JOINING various chains by covalent bonds is called CROSS linking and this leads to network structure like in bakelite and malamine polymers.
Discussion
11813.

Wurtz reaction of methyl iodide yields an organic compound X. Which of the following reaction also yields X?

Answer»

`C_(2)H_(5)Cl+LiAlH_(4)to`
`C_(2)H_(5)Cl+Mgoverset("dery ether")to`
`C_(2)H_(5)Cl+C_(2)H_(5)ON ATO`
`CH_(3)Cl+Ag("Powder")to`

Solution :The product 'X' is ethane and is ALSO formedby the reduction of `C_(2)H_(5)Cl` with `LiAlH_(4)`.
Discussion
11814.

Which of the following lanthanoids show (+2) oxidation state besides the characteristic oxidation state (+3) of lanthanoids?

Answer»

Ce
Eu
YB
Ho

Solution :Eu and Yb after loss of TWO ELECTRONS gains `f^(7) and f^(14)` configuration respectively.
Discussion
11815.

What is an electrochemical series?

Answer»

SOLUTION :The standard aqueous electrode potential at 298K for various metal - metal ion electrodes are ARRANGED in the decreasing order of their standard reduction potential values as shown in the FIGURE. This series is CALLED ELECTROCHEMICAL series.
Discussion
11816.

When O_(2)is converted to O_(2)^(2-),

Answer»

both paramagnetic CHARACTER and BOND ORDER increase
bond order decreases
paramagnetic character increases
paramagnetic character decreases and the bond order increases

Answer :D
Discussion
11817.

Zn^(2+) to Zn_((s)),E^(@)=-0.76V Cu^(2+)toCu_((s)),E^(@)=-0.34V which of the following is spontaneous

Answer»

`ZN^(2+)toCutoZn+Cu^(2+)`
`Cu^(2+)+ZntoCu+Zn^(2+)`
`Zn^(2+)+Cu^(2+)toZn+Cu`
none of these

Solution :`Zn^(2+)toZn_((s)),E^(o)=-0.76V`
`Cu^(2+)toCu_((s)),E^(o)=-0.34V`
A redox reaction is FEASIBLE if `E_(cell)` is positive.
`Zn^(2+)+2e^(-)toZn_((s)),E^(o)=-0.76V`
`UNDERLINE(Cu^(2+)+2e^(-)toCu_((s)),E^(o)=-0.34V"")`
`thereforeCu^(2+)+ZntoZn^(2+)+Cu,E_(cell)=E_((Cu^(2+)//Cu))^(o)-E_((Zn^(2+)//Zn))^(o)`
Therefore, `E_(cell)=-0.34-(-0.76)`
`=-0.34+0.76=+0.42V`
Discussion
11818.

What are A and B in the following reactions?(I) CH_3 CO_2 H underset( Red p)overset( HI) to A (II)2CH_3 CO_2 H overset( P_4O_10 ) to B

Answer»

`{:(A,, B ) ,(CH_3COCH_3,,(CH_3CO)_2O) :}`
`{:(A,, B ) ,(C_2H_6,,CH_3COCH_3) :}`
`{:(A,, B ) ,(C_2H_6,,(CH_3CO)_2O) :}`
`{:(A,, B ) ,((CH_3CO)_2,,C_2H_6) :}`

ANSWER :C
Discussion
11819.

The standard emf of a galvanic cell involving 2 moles of electrons in it redox reaction is 0.59 V.The equilibrium constant for the redox reaction of the cell is

Answer»

`10^(20)`
`10^(5)`
10
`10^(10)`

Solution :GALVANIC cell redox reaction is
`Zn_(s)+Cu_((aq))^(2+)hArrZn_((aq))^(2+)+Cu_(s)`
At the equibrium state the concentration of `Cu^(2+)`
and `Zn^(2+)` ions are in equibrium .So `E_(cell)`=0.
Then EQUILIBRIUM constant ,`K_(C)` is calculated as
`E_(cell)^(@)=(0.059)/(n)logK_(c)` or `0.59=(0.059)/(2)logK_(c)`
or `logK_(c)=(0.59xx2)/(0.059)=20`
`K_(c)`=antilog 20 =`10^(20)`
Discussion
11820.

Which of the following alcohols is most likely to yield 2-methylpropanoic acid.

Answer»

PROPAN -2-ol
Butan-1-ol
2-methylpropan -1-ol
2-methylpropan -2-ol

Answer :C
Discussion
11821.

What are micelles ? Give an example of micellar system.

Answer»

Solution :The particles of colloidal size formed due to aggregation of several IONS or molecules with lyophobic as well as LYOPHILIC PARTS are called micelles. The common micelles system is system of soap and water. In solution, the sodium strearate ions get associated to form ionic micelles of colloidal size. The micelles may contain as many as 100 molecules or more. For example, sodium stearate `(C_17H_35COONa)`when DISSOLVED in water gives `Na^(+)` and `C_17H_35COO^(-)` ions
`underset("sodium stearate")(C_17H_35COONa) to underset("stearate ions")(C_17H_35COO^(-) + Na^(+) )`
The stearate ions associate to form ionic micelles of colloidal size .
Discussion
11822.

Which of the following is not correctly matched (P : Pairing energy )?

Answer»

`[Co(H_(2)O)_(6)]^(3+)": "Delta_(0) lt P" :"PARAMAGNETIC"`
`[NiF_(6)]^(2-)": "Delta_(0) GT P" :"Diamagnetic"`
`[RhF_(6)]^(3-)": "Delta_(0)GTP" :"Diamagnetic"`
`[Fe(NH_(3))_(6)]^(2+)": "Delta_(0) lt P":"Paramagnetic"`

Solution :`[Co(H_(2)O)_(6)]^(3+),Delta_(0)gtP,` Diamagnetic.
Discussion
11823.

Which of the followingis used as a moderator in nuclear reactor

Answer»

HEAVY hydrogen
OZONE
heavy WATER
hydrogen peroxide

ANSWER :C
Discussion
11824.

Which of the following acts an activator in froth floatation process ?

Answer»

KCN 
SODIUM METHYL xanthate 
CRESOL 
`CuSO_4`

Solution :Copper SULPHATE activates frothing character of SULPHIDE ore.
Discussion
11825.

Whichof the followingare epimers ?

Answer»

D(+) Glucoseand D(+) - GALACTOSE
D(+) - Glucoseand D(+) - MANNOSE
NEITHER (a) nor (B)
Both (a) and (b)

ANSWER :D
Discussion
11826.

Which statement about enzymes is not correct?

Answer»

UREASE is an ENZYME
Enzymes are CATALYSTS
Enzymes can catalyse any reaction
Enzymes are in COLLOIDAL state.

Answer :C
Discussion
11827.

Write the structural formula and IUPAC names of all possible isomers of the compound with molecular formula C_(3)H_(8)O.

Answer»

Solution :Possible isomers of `C_(3)H_(8)O` with structural FORMULAE and IUPAC names :
`{:("Structure","IUPAC name"),("(a) "CH_(3)-CH_(2)-CH_(2)-OH,"Propan-1-ol"),("(B) "CH_(3)-underset(OH)underset("|")"CH"-CH_(3),"Propan-2-ol"),("(c) "CH_(3)-CH_(2)-O-CH_(3),"1-Methoxyethane"):}`
Discussion
11828.

Van't Hoff factor (i) for an aqueous solution of an electrolyte is

Answer»

Zero
Greater than 1
Equal to ONE
`LE 0`

ANSWER :B
Discussion
11829.

Which of the following condition is incorrect for well behaved wave function psi?

Answer»

`psi` must be single valued at any particlular POINT
`psi` must be FINITE
`psi` must be POSITIVE
`psi` must be a continous function of its coordinates.

Answer :C
Discussion
11830.

The volume of oxygen required for complete oxidation of 2.0 litre methane at NTP is :

Answer»

12.25 litre
4 litre
1 litre
3 litre

Answer :B
Discussion
11831.

Which of the following is not an ionic trihalide ?

Answer»

`AlF_3`
`BF_3`
`InF_3`
`GaF_3`

ANSWER :B
Discussion
11832.

When a compound X reacts with ozone in aq medium, a compound Y is produced. Ozone also reacts with moist Y and produces compound Z. Z acts as an oxidising agent, then X, Y and Z will be:

Answer»

`X=HI, Y=I_(2) and Z=HIO_(3)`
`X=KI, Y=I_(2) and Z=HIO_(3)`
`X=KI, Y=I_(2) and Z=HIO_(4)`
`X=HI, Y=I_(2) and Z=HIO_(4)`

ANSWER :A::B
Discussion
11833.

Which of the following is used in tyre cords?

Answer»

Terylene
polyethylene
polypropylene
Bakelite
Discussion
11834.

Write the structure and common name of (i) Ethoxy benzene (ii) Phenoxy benzene

Answer»

SOLUTION :(i) `C_6H_5 - O - CH_2 - CH_3` : Ethoxy BENZENE (or) Phenetole (or) Ethyl PHENYL ether
(ii) `C_6H_5 - O - C_6H_5` : Phenoxy benzene (or) DIPHENYL ether (or) Phenyl ether
Discussion
11835.

Which nucleus has higher binding energy per nucleon: ""_(28)^(58)Ni (57.941 amu) or ""_(25)^(55)Mn (54.939amu) ? Mass of neutron is 1.00867 amu and that of proton is 1.00728 amu.

Answer»


ANSWER :NI
Discussion
11836.

Which of the following does not cause pollution:

Answer»

BURNING of rubber
Burring of petrol
Use of SOLAR energy
Coal

Answer :C
Discussion
11837.

Thiamine belongs to whch vitamin ?

Answer»

SOLUTION :VITAMIN `B_1`
Discussion
11838.

Write the uses of medicines.

Answer»

Solution :Medicines are used in DIAGNOSIS, prevention and TREATMENT of DISEASES.
Discussion
11839.

Which of the following species is amphoteric in nature ?

Answer»

`H_3O^+`
`CL^-`
`HSO_4^-`
`CO_3^(2-)`

ANSWER :C
Discussion
11840.

We have taken a saturated solution of AgBr. K_(sp) of AgBr is 12 xx 10^(-14)." If "10^(-7) mole of AgNO_(3) are added to 1 litre of this solution find conductivity (specific conductance) of this solution in terms of 10^(-7)S m^(-1) units. Given lambda_((Ag^(+))^(@))=6 xx 10^(-3) Sm^(2) mol^(-1), lambda_((Br^(-))^(2))=8 xx 10^(-3) Sm^(2) mol^(-1), lambda_((NO_(3)^(-))^(@))=7 xx 10^(-3) Sm^(2) mol^(-1).

Answer»


ANSWER :3.465j
Discussion
11841.

What is esterification? Explain the mechanism of esterification.

Answer»

Solution :When carboxylic acids are HEATED with alcohols in the PRESENCE of conc. HCL (or) dry HCl GAS, esters are FORMED. This reaction is reversible and is called esterification.
Discussion
11842.

Which of the following does not give a precipitate with an ammoniacal solution of silver nitrate but decolourises KMnO_(4) ?

Answer»

ETHANE
ethyne
ethylene
PROPYNE

Solution :Ethylene can decolourise `KMnO_(4)` solution but does not GIVE precipitate with ammoniacal solution of `AgNO_(3)`.
Discussion
11843.

Which of the following species are involved in the carbylamine test?

Answer»

`R-NC`
`CHCl_(3)`
`COCl_(2)`
`NaNO_(2)+HCl`

Solution :`R-NH_(2)+CHCl_(3)+3KOH to RNC+3KCl+3H_(2)O`
Only RNC and `CHCl_(3)` are involved in CARBYLAMINE REACTION.
Discussion
11844.

What is the scientefic explanation for the feeling depression ?

Answer»

Solution :NORADRENALINE is a neuro-transmitter. Which plays an CRUCIAL role in mood changes. If any person has LOW LEVEL of noradre naline, then the massagetransfer process BECOMES slow and the person feeling of depression.
Discussion
11845.

The van der Waals' equation for equal real gas is :

Answer»

<P>`(P+(a)/(V^2) )(V-b) = RT`
`(P+(n^2a)/(V^2) )(V-nb) = NRT`
`P=(nRT)/(V-nb) - (an^2)/(v^2)`
All of the above

Answer :D
Discussion
11846.

Which of the following will have lowest ionisation enthalpy?

Answer»

Ar
Xe
Kr
He

Answer :B
Discussion
11847.

When manganous salt is fused with a mixture of KNO_(3) and solid NaOH, the oxidation number of Mn changesfrom +2 to

Answer»

`+4`
`+3`
`+6`
`+7)`

SOLUTION :`Mn^(2+) + 2OH^(-) + (O) underset("of manganous salt")OVERSET("Alkaline OX.")(rarr)MnO_(2)+ H_(2)O`
`MnO_(2)+ 2NaOH + underset("(From KNO_(3))")(O) rarrNa_(2)overset(+6)(Mn)O_(4)+H_(2)O`
Discussion
11848.

What is the chemical name of vitamin C and which disease is caused by its deficiency?

Answer»

Solution :ASCORBIC acid, DEFICIENCY DISEASE : Scurvy.
Discussion
11849.

Write the IUPAC name for any of the isomers with the molecular formula [Pt(NH_(3))_(2)Cl_(2)]CI_(2).

Answer»

SOLUTION :cis-diamminedichloridoplatinum(IV) CHLORIDE.
Discussion
11850.

What is the role of NaCN in the extraction of silver from silver ore ?

Answer»

SOLUTION :To FORM a SOLUBLE COMPLEX.
Discussion