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1651.

The sodium salt of the acid which does not form an alkane when subjected to electrolysis:

Answer»

SODIUM FORMATE
Sodium acetate
Sodium propionate
Sodium butanoate

Answer :A
Discussion
1652.

What total amount of energy in calories would be required to shift all the electrons from the first Bohr orbit to the sixth Bohr orbit in 1 mole of hydrogen ? Through what distance would each electron have to move? What frequency of radiation would be emitted if the electrons returned to their initial state ?

Answer»

SOLUTION :304800 CALORIES
Discussion
1653.

Whichof the followingreactionwill givesacetone ? (1) CH_(3) - CN + CH_(3) Mg X underset(H_(3) O^(+))overset(" dryether")to(2)CH_(3) -overset(OH)overset(|)(CH) - CH_(3) overset([O])toCH_(3) - overset(OH)overset(|)(CH)- CH_(3)overset("dil . HCl")to

Answer»

1,2
1,3
2,3
1,2,3

Answer :D
Discussion
1654.

The shape of cobalt hexa-ammine cation, which has its central cobalt atom surrounded by six ammonia molecules is:

Answer»

Tetrahedral
Octahedral
Square planar
Trigonal

Answer :B
Discussion
1655.

Which of the following is pseudo alum :

Answer»

`(NH_4)_2SO_4. Fe_2(SO_4)_3. 24H_2O`
`K_2SO_4. Al_2(SO_4)_3. 24H_2O`
`MnSO_4. Al_2(SO_4)_3. 24H_2O`
NONE of the above

Answer :C
Discussion
1656.

Vit-B_1 is known as

Answer»

Retinol
thiamine
riboflavin
ascorbic acid

Answer :B
Discussion
1657.

Which one of the following is an antiseptic?

Answer»

HYDROGEN PEROXIDE
alcohol
MENSTRANOL
CHLORINE compound

Solution :Hydrogen peroxide
Discussion
1658.

what happens when : (i) Manganate ions (MnO_(4)^(2)) undergoes disproportionation reaction in acidic medium ? (ii) Lanthanum is heated with sulphur ? (b) explain the following trends in the properties of the members of the first series of transition elements: (i) E^(@)(M^(2+)//M) value for copper is positive (+0.34V) in contrast to the other members of the series . (ii) Cr^(2+) is reducing while Mn^(3+) is oxidising power in the series increases in the order VO_(2)^(+)

Answer»

SOLUTION : (i) `MNO_(4)^(2-)` ions dispropotionate in acidic medium to give permanganate ions and manganese (IV) oxide .
`3MnO_(4)^(2-) +4H^(+)rightarrow2MnO_(4)^(-)+MnO_(2)+2H_(2)O`
(ii) Lanthanum sulphide is formed
`2La+3Soverset(""Heat")to La_(2)S_(3)`
(ii) lathanum sulphide is firmed .
( `2La+3Soverset(".Heat".)toLa_(2)S_(3)`
(b)(i) Copper has high enthalpy of atomisation and low enthalpy of hydratio . Since the high energy to TRANSFORM Cu to `Cu^(2+)` (aq) is not balanced by hydration e thalpy, thterfore `E^(@)(M^(2+)//M)` value for copper is positive `(+0.34v)`
(ii) `CR^(2+)` is reducing as its co nnfiguration changes from the `d^(4)` to `d^(3)`, the latter having more STABLE half filled `t_2g)` level . On the other hand , the change from `Mn^(3+)` to `Mn^(2+)` results in extra stable `d^(5)` configuration .
(ii) This due to increasing stabillity of the SPECIES of lower oxidation states to which they are reduced .
Discussion
1659.

The solution of CuSO_(4) in which copper rod is immersed is diluted to 10 times. The reduction electrode potential

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INCREASES by 0.03 V
Decreases by 0.03 V
Increased by 0.059 V
Decreases by 0.05 V

ANSWER :B
Discussion
1660.

When one mole of monoatomic ideal gas at T temperature undergoes adiabatic change under a constant external pressure of 1 atm, change in volume is from 1 L to 2L. The final temperature in kelvin would be

Answer»

`(T)/(2^((2//3)))`
`T+(2)/(3xx0.0821)`
`T`
`T-(2)/(3xx0.0821)`

SOLUTION :`(T)/(T_("FINAL"))=((V_(2))/(V_(1)))^(gamma-1)=((2)/(1))^((5//3-1))`
`=2^((2//3)),T_("final")=(T)/(2^((2//3)))`
Discussion
1661.

Which one of the following is chemical adsorption?

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ADSORPTION of `O_(2)`, on tungsten
Adsorption of ethyl alcohol VAPOURS on nickel
Adsorption of `N_(2)`, on mica
Rusting of iron

Solution :Rusting of iron
Discussion
1662.

Which is not a disproportionation reaction :

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`NaH+H_(2)OtoNaOH+H_(2)`
All the above

Solution :It's a comproportion REACTION w.r.tH
Discussion
1663.

The starting raw material in Dow's process is ____________.

Answer»

ANILINE
CHLOROBENZENE
diazobenzene
PHENOL

ANSWER :B
Discussion
1664.

Which type of alcohol is obtained on reduction of ketone ?

Answer»

`1^(@)`
`2^(@)`
`3^(@)`
All of these

Solution :Reduction of ALDEHYDE RESULT in to `1^(@)` alcohol and reduction of KETONE RESULTS in to `2^(@)` alcohol.
Discussion
1665.

Which of the following will give 1^(@), 2^(@), 3^(@), monobromo derivative ?

Answer»

`CH_(3)CH_(2)-CH_(2)-CH(CH_(3))CH_(3)`
`CH_(3)CH_(2)CH_(2)-CH_(2)-CH_(3)`
`CH_(3)CH_(2)-C(CH_(3))-CH_(3)`
`CH_(3)-CH(CH_(3))CH(CH_(3))CH_(3)`

Solution :COMPOUNDS (a) has three types of hydrogen atoms i..e, `1^(@) H, 2^(@) H, 3^(@)` . On MONOBROMINATION GIVE three MONOBROMO DERIVATIVES.
Discussion
1666.

Which of the following is used for sterilization of surgical instruments?

Answer»

`HgCl_2`
`ZnCl_2`
`Hg_2Cl_2`
`ZNO`

ANSWER :A
Discussion
1667.

Which of the following weighs the least?

Answer»

24 G of MAGNESIUM
0.9 MOLE of nitric oxide
22.4 L of` N_2`
`6.02 xx 10^24`molecules of oxygen

Solution :24 g of magnesium
Discussion
1668.

Which one of the following is not correct in respect to hybridization of orbitals ?

Answer»

The orbitals present in the valence shell only are hybridized.
The orbitals undergoing HYBRIDIZATION have almost equal energy
Promotion of electron is not essential condition for hybrization
It is not always that only partially filled orbitals participate in hybridization, in some cases EVEN filled orbitals in valence shell TAKE part

Solution :(E) Pure atomic orbitals are less effective in forming stable BONDS than HYBRID orbitals.
Discussion
1669.

What is the reactivity order of primary secondary and tertiary alcohols involving the cleavage of O-H bond?

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Solution :The general order of REACTIVITY of alcohols towards this type of reaction is:

This is justified on the basis of + I effect othte ALKYL group (R). The group increases the ELECTRON density on the OXYGEN atom of O-H group. It makes the cleavage easy.
Discussion
1670.

Which is the common general formula alkanol compounds ?

Answer»

`C_(n)H_(2N)O`
`C_(n)H_(2n+1)O`
`C_(n)H_(2n+2)O`
`C_(n)H_(2n)O_(2)`

SOLUTION :`C_(n)H_(2n+2)O`
Discussion
1671.

Which of the following acts as a reducing agent in Hall-Heroult process ?

Answer»

`Na_3AlF_6`
`CaF_2` 
GRAPHITE 
`Al_2O_3`

ANSWER :C
Discussion
1672.

Theresistance of 1N solutionof acetic acidis 250 omegawhenmeasuredin a cell having a cell constant of1.15 csm^(-1)The equivalent conductance (in "ohm"^(-1) cm^(2)"equiv"^(-1)) of 1N acetic acidis

Answer»

2.3
4.6
9.2
18.4

Solution :Equivalentconductivity `(wedge_("eq"))=(kxx1000)/(C )`
conductivity (k) `=("cell CONSTANT ")/("Resistance") =(1.15 )/(250) S CM^(-1)`
`thereforewedge_(eq)=(1.15 xx1000)/(250 xx1) =4.6 "ohm"^(-) cm^(2) "eqiv"^(-1)`
Discussion
1673.

The Zinc metal that we get on commercial basis is called....

Answer»

ZINCITE 
Blister 
SPELTER 
NONE of these 

ANSWER :C
Discussion
1674.

The substance widely used to remove silica present as impurity, from the ore is

Answer»

`CAO`
`P_2 O_5`
`SIC`
`Na_2 CO_3`

ANSWER :A
Discussion
1675.

The vander Waals constants for gases A,B and C are as follows Gasa//dm^(6)kPa mol^(-2)b//dm^(3) mol^(-1) A405.30.027 B1215.90.030 C607.950.032 Which gas has most ideal behaviour around 600K?

Answer»


ANSWER :A
Discussion
1676.

The solubility product of Mg(OH)_(2) is 1.2 xx 10^(-11). The solubility of this compound in gram per 100 cm^(3) of solution is

Answer»

`1.4 xx 10^(-4)`
`8.16 xx 10^(-4)`
0.816
1.4

Solution :`{:("Mg"(OH)_(2),hArr,"Mg"^(2+)+,2OH^(-)),(,,(S),(2S)^(2)):}`
`K_(sp) = 4S^(3) rArr S = 3sqrt((K_(sp))/(4)) = 3sqrt((1.2 xx 10^(-11))/(4))`
`S = 1.44 xx 10^(-4) mol L^(-1) = 58 xx 1.44 xx 10^(-4) g L^(-1)`
(mol. mass of `Mg(OH)_(2) = 50`)
`= 83.52 xx 10^(-4) g L^(-1) = 8.35 xx 10^(-4)g//100c C`.
Discussion
1677.

Which type of Stoichmetric defect is shown by the following solids? a) AgCl b) KCl

Answer»

SOLUTION :a) FRENKEL DEFECT
B) SCHOTTKY defect
Discussion
1678.

The total number of sigma (sigma) and pi (pi) bonds in an ethylene molecule are

Answer»

`4sigma, 2PI`
`4sigma, 1pi`
`5sigma, 2pi`
`5sigma, 1pi`

ANSWER :D
Discussion
1679.

Which one of the following contains ionic, covalent and co-ordinate and coordinate linkage is

Answer»

NaOH
NaCl
NaCN
NaNC

Solution :`NA^(+)[NC]^(-)`
Discussion
1680.

Which of the following expressions correctly represents the equivalent conductance at infinite dilution of Al_(2)(SO_(4))_(3). Given that lamda_(Al^(3+))^(@) and lamda_(SO_(4)^(2-))^(@) are the equivalent conductances at infinite dilution of the respective ions?

Answer»

`2lamda_(Al^(3+))^(@)+3lamda_(SO_(4)^(2-))^(@)`
`lamda_(Al^(3+))^(@)+lamda_(SO_(4)^(2-))^(@)`
`lamda_(Al^(3+))^(@)+lamda_(SO_(4)^(2))^(@)xx6`
`(1)/(3)lamda_(Al^(3+))^(@)+(1)/(2)lamda_(SO_(4)^(2-))`

SOLUTION :`wedge_(EQ)^(@)[Al_(2)(SO_(4))_(3)]=lada_(Al^(3+))^(@)+lamda_(SO_(4)^(2-))^(@)`
Discussion
1681.

Which does not cause hardness of water ?

Answer»

`CaCl_2`
`MgSO_4`
`Na_2SO_4`
`FeSO_4`

ANSWER :C
Discussion
1682.

Whichamong the following reactionsis an exampleof pseudo first order reaction ?

Answer»

Inversion of cane SUGAR
Decomposition of `H_(2)O_(2)`
Conversionof cyclopropane topropene
Decomposition of `N_(2)O_(5)`

Solution :The REACTIONSIN WHICHTHE MOLECULARITY is two butthey confirmto the firstorder are knownas pseudo firstorder areknown as pseudofirst orderreactionorpseudounimolecularreactions.
e.g, inversation of cane sugar,
`underset(("Cane sugar"))underset("Sucrose")(C_(12H_(22)O_(11)) + H_(2)O overset(H^(+))rarr underset("GLUCOSE")(C_(6)H_(12)O_(6)) + underset("Fructose")(C_(6)H_(12)O_(6)`
The concentrationof water remains constant
Discussion
1683.

Which out of the following metals can be obtained by clectolysis of the aqueous solution of their

Answer»

AG
Mg
Au
Na

Solution :Ag & Au can be OBTAINED by the electrolysis of the aqueous solution of their SALTS because they have positive SRP.
Discussion
1684.

Write short note Melamine-formaldehyde polymer.

Answer»

Solution :MELAMINE formaldehyde POLYMER is FORMED by the CONDENSATION polymerization of melamine and formaldehyde.

It is used in the manufacture of unbreakable crockery.
Discussion
1685.

What type of intermolecular attraction exists in each of the following pair of compounds : (i) n-hexane and n-octane , (ii) methanol and acetone.

Answer»

Solution :(i) Van der WALLS forces. (ii) HYDROGEN BONDING.
Discussion
1686.

What is meant by limiting molar conductivity ?

Answer»

Solution :When the CONCENTRATION APPROACHES ZERO, the molar conductivity of a solution is CALLED limiting molar conductivity.
Discussion
1687.

What is emf of Daniell cell having 0.1 M ZnSO_(4) and 0.01 M CuSO_(4) solution ? [E_(Cu)^(o)=0.34V and E_(Zn)^(o)=-0.76V].

Answer»

1.10V
1.04 V
1.16V
1.07V

Solution :`E=E^(o)-(0.059)/(2)"LOG"([ZN^(2+)])/([CU^(2+)])`
`E^(o)=E_((Cu^(2+)|Cu))^(o)-E_((Zn^(2+)|Zn))^(o)`
`E^(o)=0.34-(-0.76)`
`E^(o)=0.34+0.76`
`E^(o)=1.10V`
`E=1.10-(0.059)/(2)"log"(0.1)/(0.01)`
`=1.10-0.295=1.0705V`.
Discussion
1688.

Which one of the following is the smallest in size

Answer»

`N^(3-)`
`O^(2-)`
`F^(-)`
`NA ^(+)`

Answer :D
Discussion
1689.

Which of the following statement is/are correct about benzene

Answer»

It burns with scooty flame
It undergoes ELECTROPHILIC substitution reaction
Its resonace energy is `36 kcal mol^(-1)`
It is highly unsaturated and decolourises bromine water

Solution :(a),(b) and (C ) are correct STATEMENTS.
(d) is wrong due to delocalization of `pi`-electrons
Discussion
1690.

Which of the following reaction does not from either ?

Answer»

RX+ AQ. KOH
RX+ RONa
`CH_2N_2` + ROH
ROH + `H_2SO_4` at 413 K

SOLUTION :`RX+aq. KOH oversetDelta to ROH + KX `
`RX + RONa OVERSET(Delta)to ROR + NaX`
`CH_2N_2+ROH overset(Delta)to ROCH_3 + N_2`
`2ROH + H_2SO_4 overset"413 K"to ROR + H_2SO_4 + H_2O`
Discussion
1691.

Which of the followmg has the highest melting point ?

Answer»

`(CH_(3)CO)_(2)O`
`CH_(3)CN`
`CH_(3)CONH_(2)`
`CH_(3)COCL`

Answer :A
Discussion
1692.

Which of the following substrates will gave racemised product?

Answer»




Solution :(a) is only optically active PRODUCT which will give RACEMIC products. OTHERS are not optically active.
Discussion
1693.

Which of the following isomerisms are shown by the complex [CoCl_(2)(OH)_(2)(NH_(3))_(2)]Br?

Answer»

Ionization
Linkage
GEOMETRICAL
Optical

Solution :Br and Cl can INTERCHANGE their POSITIONS. Hence, it shows ionizations isomerism. It an also exist as CIS and trans-isomers. The cis can show optical isomerism.
Discussion
1694.

When an aqueous concentrate solution of lithium chloride is electrolysed using inert electrodes:

Answer»

`Cl_2` is liberated at the anode
Li is deposited at the cathode
as the CURRENT flows, pH of the solution around the cathode remains CONSTANT
as the current flows, pH of the solution around the cathode INCREASES

Solution :Electroes , inert electrodes , ELECTROLYTE , LiCl
`"Anode " : 2Cl^(-) to Cl_2 + 2e^(-) , "Cathode" : 2H^(+) + 2e^(-) to H_2`
`P^(H) = log""(1)/([H^(+)]) ,P^(H)` of solution around cathode increases
Discussion
1695.

Which ore is used to prepare potassium permanganate?

Answer»

PYROLUSITE
Chromite
Argentite
Cuprite

Solution :Pyrolusite
Discussion
1696.

Which of the following is/are oxide ores?

Answer»

Cassiterite
Malachite
Chromite
Dolomite

Solution :NA
Discussion
1697.

What is the potential of the cell containing two hydrogen electrodes as represented below Pt, (1)/(2) H_(2)(g) | H^(+ ) (10^(-8)M)|| H^(+) (0.001M) | 1//2 H^(2)_(g) Pt

Answer»

`-0.0591 V`
`0.0591 V`
`0.295 V`
`-0.205 V`

ANSWER :C
Discussion
1698.

Which of the following is manufactured from the molecular nitrogen by bacteria

Answer»

`NO_(3)`
`NO_(2)`
AMINO ACIDS
AMMONIA

ANSWER :A
Discussion
1699.

Which of the following is a formula to calculate degree of dissociation ?

Answer»

`ALPHA N - alpha = i`
`alpha n-alpha+1=i`
`alpha i-alpha+1=n`
`alpha -alpha n-1=i`

ANSWER :B
Discussion
1700.

Which is the monomer of PVC ?

Answer»

Ethane
VINYL CHLORIDE
Ethyne
Ethyl chloride

SOLUTION :Vinyl Chloride
Discussion