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1251.

Which of the following can be used as dehydrating agent for alcohols ?

Answer»

`H_3PO_4`
`H_2SO_4`
`Al_2O_3`
all of these

ANSWER :D
Discussion
1252.

Which of the following substance has highest proton affinity ?

Answer»

`PH_(3)`
`H_(2) O`
`H_(2) S`
`NH_(3)`

Answer :D
Discussion
1253.

The sequence in the structure of nucleic acid is:

Answer»

BASE + phosphate GROUP + pentose
Phosphate group + sugar + base
Pentose + base + phosphate group
All

Answer :B
Discussion
1254.

Which of the following plastics is a last product of the reaction. CFCl_(3) underset(SbF_(3))overset("HF")(rarr) " X " overset(800^(@)C)(rarr) " Y " overset("Polymerisation")(rarr) Plastic

Answer»

Bakelite
Teflon
Polyethene
None of the above

Answer :D
Discussion
1255.

The resistance of 0.15M solution of an electrolyte is 50 Omega. The specific conductance of the solution is 2.4 Sm^(-1). The resistance of 0.5 N solution of the same electrolyte measured using the same conductivity cell is 480 Omega. Find the equivalent conductivity of 0.5 N solution of the electrolyte.

Answer»

Solution :GIVEN that `R_1 = 50 Omega , R_2 = 480 Omega`
`k_1 = 2.4 Sm^(-1) k_2 = ?`
`N_1 = 0.15 N N_2 = 0.5 N`
`LAMBDA = (k_2(Sm^(-1)) xx 10^(-3)("GRAM equivalent")^(-1)m^(3))/(N) = (0.25 xx 10^(-3)S("gram equivalent")^(-1)m^2)/(0.5)`
`= 5 xx 10^(-4) Sm^(2) "gram equivalent"^(-1)`
We KNOW that `k = ("Cell constant")/R "" :. (k_2)/(k_1) = (R_1)/(R_2)`
`k_2 = k_1 xx (R_1)/(R_2) = 2.4 Sm^(-1) xx (50 Omega)/(480 Omega) = 0.25 Sm^(-1)`.
Discussion
1256.

When ammonium chloride is dissolved in water, the solution becomes cold.The change is:

Answer»

Endothermic
Exothermic
Super cooling
None

Answer :A
Discussion
1257.

Which of the following reactions are correct ? C_(6)H_(13)CH=CH_(2)+BrC Cl_(3)overset("peroxides")rarr C_(6)H_(13)underset(Br)underset(|)(C)HCH_(2)C Cl_(3)

Answer»

only (a)
only (B)
both are correct
None of these

Answer :C
Discussion
1258.

The vapour pressure of ethanol and methanol at 298 K is 44.5 mm and 88.7 mm respectively. At same temperature, if ideal solution is prepared by mixing 60 gm of ethanol and 40 gm of methanol. Then find out mole fraction of methanol in vapour state.

Answer»


ANSWER :`0.656`
Discussion
1259.

Write the equations for the preparation of 1 - iodobutane from(i) 1-butanol (ii) 1-chlorobutane (iii) but-1-ene.

Answer»

SOLUTION :(i) `underset("Butan-1-ol")(CH_(3)CH_(2)CH_(2)CH_(2)OH)overset(" RedP ")underset(I_(2))rarr underset("1-Iodobutane")(CH_(3)-(CH_(2))_(2)-CH_(2)-I)`
(ii) `CH_(3)-(CH_(2))_(2)-CH_(2)-Cl overset(" NaI ")underset(" ACETONE ")rarr CH_(3)-(CH_(2))_(2)-CH_(2)-I`
(III) `CH_(3)-CH_(2)-CH=CH_(2)overset(" HI ")rarr CH_(3)-CH_(2)CH_(2)CH_(2)I`
Discussion
1260.

When dilute aqueous solution of AgNO_(3) (excess) is added to KI solution, positively charged solution particles of AgI are formed due to adsorption of ion

Answer»

`NO_(3)^(-)`
`O_(2)^(-)`
`AG^(+)`
`K^(+)`

ANSWER :C
Discussion
1261.

Which of the following oxide is most stable:

Answer»

`AO_(2)(G)hArrA(g)+O_(2)(g),K=10^(-6)`
`A_(2)O_(3)(g)hArr2A(g)+(3)/(2)(g),K=10^(-5)`
`A_(2)O_(5)(g)hArr2A(g)+(5)/(2)O_(2)(g),K=10^(-7)`
`A_(2)O(g)hArr2A(g)+(1)/(2)O_(2)(g),K=10^(-2)`

Answer :C
Discussion
1262.

What inspired N. Bartlett for carrying out reaction between Xe and PtF_6?

Answer»

Solution : In 1962, N. Bartlett noticed that platinum hexafluoride, `PtF_6`is a powerful OXIDISING agent which combines with molecular oxygen to form ionic COMPOUND, dioxygenyl hexafluoroplatinate(V),` O_(2)^(+) [PtF_6]^(-)`
`O_2 (g) + PtF_6(g) overset("heat")(to) O_(2)^(+) [PtF_6]^(-)`
This indicates that `PtF_6`has oxidised `O_2` to `O_(2)^(+)`. Now oxygen and xenon have some SIMILARITIES.
(i) The first ionisation energy of xenon gas (1170 kJ `"mol"^(-1)`) is fairly close to that of oxygen (1166 kJ` "mol"^(-1)`).
(ii) The molecular diameter of oxygen and atomic radius of xenon are SIMILAR (4 Å). This prompted Bartlett to carry out the reaction between Xe and `PtF_6`. He found that Xe related with `PtF_6`EVEN in cold.
`Xe + PtF_6 to Xe^(+) [PtF_6]^(-)`
Discussion
1263.

Write the chemistry of reacharging the lead storage battery , highlighting all the meterial that are involved during recharging?

Answer»

Solution :A lead storages battery CONSISTS of anode made up of lead, cathod made up of GRID of lead packed with lead dioxide `(PbO_2)` and 38% solution of sulphuric acid is USED as an electrolyte. When the battery is in use, the following reaction take place :
Anode:`Pb(s) + SO_(4)^(2-)(aq) to PbSO_4(s) + 2E^(-)`
Cathode: `PbO_2(s) + SO_4^(2-) (aq) + 4H^+(aq) + 2e^(-) to 2PbSO_4(s) + 2H_2O(l)`
On charging tha battery, the reverse reaction reaction takes place, i.e. `PbSO_4` depostied on the electrode is converted back into Pb and `PbO_2 and H_2SO_4` is regenerated.
Discussion
1264.

The wave length of a moving body of mass one-tenth of a milligram is 3.312 xx 10^(-29) m. Calculate its kinetic energy.

Answer»

SOLUTION :`2XX10^(-3)J`
Discussion
1265.

Which one of the following is not a property oif Hydro sols ?

Answer»

HIGH concentration of dispersed PHASE can be easily attained .
Coagulation is reversible .
Viscosity and surface tension are about the same as for water .
The charge of particle DEPEND upon the `P^(H)` values of the medium it may be POSITIVE negative or even ZERO.

Solution :Viscocity and surface tention are about the same as per water
Discussion
1266.

White precipitate of PbSO_(4) gets dissolved in:

Answer»

concentrated `H_(2)SO_(4)` on HEATING
concentrated `NaOH`
`(NH_(4))_(2)CO_(3)`
Dilute `HNO_(3)`

Solution :(A)`PbSO_(4)darr +H_(2)SO_(4)` (hot and concentrated) `to Pb^(2+)+2HSO_(4)^(-)`(soluble)
(B)It DISSOLVES FORMING `Na_(2)[Pb (OH)_(4)]` soluble complex.
Discussion
1267.

Which statement/s is/are correct?

Answer»

PHYSICAL adsorption is multilayer non-directional and non specifice
CHEMICAL adsorption takes more TIME to attain equilibrium
Physical adsrption is DUE to FREE valence of atoms
Chemical asorption is stronger than physical adsorption

Answer :B::C::D
Discussion
1268.

Which is/are correct statement ? (P) When 100 mL of 0.1M NaCN solution is titrated with 0.1 M HCI solution the variation of pH of solution with volume added will be (as shown in fig.) (Q) Variation of degree of dissociation alpha with concentration for a weak electrolyte at a particular temperature is best represented by (as shown in fig.) (R) 0.1M acetic acid solution is titrated aganist 0.1M NaOH solution. the difference in pH between 1//4 and 3//4 stages of neutralization of acid will be 2 log 3.

Answer»

P and R
Q and R
P,Q and R
Q only

Answer :C
Discussion
1269.

Three sparingly soluble salts M_2 X, MX and MX_3 have the same solubility product. Their solubilities will be in the order

Answer»

`MX_3gt MX gt M_2X`
`MX_3gt M_2 XGT MX`
`MXgt MX_3 gt M_2X`
`MX gtM_2 X gtMX_3`

Solution :`M_2X to2M^(+)+X^(2-)`
` s_1"" 2s_2 ""s_1`
`k_(sp )= 4s_(1)^(3)or S_1=(K_(sp) //4) ^(1//3)`
`MxtoM^++X^- ,K_(sp)= s_(2)^(2)`
` orS_(2)= (K_(sp))^(1/2)`
`MX _(3)toM^(3+)+3X^(-)`
` K_(sp )= 27s_(3)^(4)ors_(3)= (K_(sp) //27 ) ^(1//4)`
Evidently`S_2gt S_1gt S_3`
Discussion
1270.

What are barbiturates ? To which class of drugs do they belong ?

Answer»

SOLUTION :5, 5-Derivatives of barbituric ACID (obtained by condensation of UREA with malonic acid) are called barbiturates. They belong to the class of TRANQUILLIZERS. They also act as sleep INDUCING agents. Some examples of barbiturates are luminal, veronal, seconal, etc.
Discussion
1271.

What is the main product obtained when vapours of t-butyl alcohol are passed over copper at 573K?

Answer»

SOLUTION :DEHYDRATION OCCURS to GIVE ISOBUTYLENE (2-methylpropene).
Discussion
1272.

The unit of equivalent conductance is ……………….. .

Answer»

`Sm^(2)G "equivalent"^(-1)`
`Sm^(-1)`
`OHM^(-1)m^(-1)`
`Ohm m`

Answer :A
Discussion
1273.

Which of the following statement about ethers is/are incorrect ? (1) Ethers, are very reactive (2) Ethers are weakly acidic (3) Ethers are Lewis base (4) Ether form stable complex with Lewis acid

Answer»

1, 2, 3
1,2
2, 3, 4
2, 4

Answer :B
Discussion
1274.

Write down the name and structure of one isomer of each or the following compounds: (a) CH_(2)=CHCH_(2)CH_(3) (b) CH_(3)CHCl_(2) (c) (CH_(3))_(2)CHOH (d) CH_(3)COOH_(3) (e) CH_(3)COOH (f) CH_(3)OCH_(2)CH_(2)CH_(3) (g) maleic acid (h) d-lactic acid.

Answer»

SOLUTION :
Discussion
1275.

What is correct statement ?

Answer»

Iodides of alkali metals have highest ionic character among halides
LiF is HIGHLY SOLUBLE in `H_2O`
Low solubility of CSL is due to smaller hydration enthalpy of its two ions
All of these

ANSWER :C
Discussion
1276.

What is nernst equation. Calculate the EMF of the galvanic cell construted fro these electrodes. Zn//Zn^(2+) (1.0M)"||"Cu^(2+)(1.0M)//Cu E^(@)Zn^(2+)//Zn= -0.766V, E^(@)Cu^(2+)//Cu= +0.327V

Answer»


ANSWER :
Discussion
1277.

The standard potential of the cell can be obtained by taking the _________ of standard potentials of cathode and anode.

Answer»

SOLUTION :DIFFERENCE
Discussion
1278.

Which of the following comments are true-

Answer»

if `pK_a` value for the acids HA and HB are 4 and 5 respectively. Then the concentration of `OH^-` ions in 0.1(M) aqueous solution of HB will be GREATER that that in 0.1(M) aqueous solution of HA
pH of pure water at `0^(@)C` is smaller than that at `25^(@)C`
The degree of HYDROYSIS of `NH_4F` in its 0.1(M) and 0.2(M) aqueous solutions is the same ata PARTICULAR temperature
pH of an acid is 5 implying that the acid is weak

Answer :A::C
Discussion
1279.

Why are Cu(I) salts colourless ?

Answer»

SOLUTION : Cu(I)ION has completely FILLED 3d-orbitals. Therefore its SALTS are COLOURLESS.
Discussion
1280.

Which is not true for a detergent molecule ?

Answer»

It has a non-POLAR organic part and a polar group
It is not easily biodegradable
It is a SODIUM salt of fatty ACID
It is a SURFACE active agent

Solution :It is a sodium salt of fatty acid
Discussion
1281.

What is/are true about the following compound.

Answer»

It has a CENTRE of SYMMETRY (inversion centre)
It has a plane of symmetry
It does not have TWO fold axis `(C_2)` of symmetry
It is an ACHIRAL molecule

Solution :It is a meso achiral COMPOUND and it is no centre of symmetry and no axis of symmetry but plane of symmetry.
Discussion
1282.

Which one of the oxides of nitrogen dimerises into colourless solid/liquid on cooling?

Answer»

`N_(2)O`
`NO`
`N_(2)O_(3)`
`NO_(2)`

Solution :`underset("(Brown)")(2NO_(2)) OVERSET("COOLING")underset("heating")to underset("(Colourless)")(N_(2)O_(4))`
Discussion
1283.

Which of the following amino acids is most basic :

Answer»

`H_2N-undersetunderset(NH)(||)C-NH-CH_2CH_2CH_2-undersetunderset(NH_2)(|)CH-COOH`
`H_2N-undersetunderset(CH_3)(|)CH-oversetoverset(O)(||)C-NH-CH_2-COOH`
`HOOC-CH_2-undersetunderset(NH_2)(|)CH-COOH`

SOLUTION :A' CONTAINS more BASIC GROUPS.
Discussion
1284.

Which of the following elements has lowest melting points?

Answer»

Cr
CU
Ni
Fe

Solution :Cu and `d^(10)` CONFIGURATION. Hence, it has LOWEST MELTING point
Discussion
1285.

Which reagent is useful in separating benzoic acid from phenol ?

Answer»

DILUTE HCI
Dilute `H_2SO_4`
5%NaOH
5% `NaHCO_3`

ANSWER :D
Discussion
1286.

The segment of DNA which acts as the instrumental manual for the synthesis of the protein is

Answer»

NUCLEOSIDE
nucleotide
Ribose
gene

Answer :D
Discussion
1287.

Which of the following is least acidic

Answer»

`As_(4) O_(10)`
`Na_(2) S`
`Na HSO_(4)`
`Na_(2) SO_(4)`

Answer :A
Discussion
1288.

What makes human blood group types A,B,AB or O different ?

Answer»

SOLUTION :The structure of the glycoproteins attached of the SURFACE of blood cells determines whether blood GROUP is type A,B,AB or O.
Discussion
1289.

Whatvolume of air will be expelled from a vessel containing 600 ml at 27^(@)C when it is heated to 37^(@)C at the same pressure ?

Answer»

0.0333
0.02
0.067
0.66

Solution :New VOLUME ` = ( 600 xx ( 310K))/(( 300K)) = 620 ml`
Volume of air EXPELLED` = 620 - 600 = 20`
% of air expelled `= ( 20)/( 600) xx 100 = 3.33%`
Discussion
1290.

The variation in Lambda_m with concentration for a strong electrolyte can be represented by the equation, Lambda_m=Lambda_m^@ -AC^(1//2) The value of constant A for a given solvent and temperature depends upon the type of electrolyte i.e., cations and anions produced on dissociation of electrolyte in the solution . NaCl, MgCl_2 and CaSO_4 are known as

Answer»

1-1,2-1, and 2-2 type ELECTROLYTES respectively
STRONG, WEAK and strong electrolytes respectively
electrolytes with different value of A
electrolytes with same MOLAR CONDUCTIVITY .

Answer :A
Discussion
1291.

The variation in Lambda_m with concentration for a strong electrolyte can be represented by the equation, Lambda_m=Lambda_m^@ -AC^(1//2) The value of constant A for a given solvent and temperature depends upon the type of electrolyte i.e., cations and anions produced on dissociation of electrolyte in the solution . Which of the following statements is correct regarding variations of molar conductivity with concentration.

Answer»

Molar conductivity DECREASE with decrease in concentration
Variation is molar conductivity of weak and strong ELECTROLYTES is same.
Molar conductivity increases with decrease in concentration.
When concentration of the solution APPROACHES zero, the molar conductivity is known as conductance.

Answer :C
Discussion
1292.

Trioxalatoaluminate(III) and tetrafluoro-borate(III) ions are :

Answer»

`[Al(C_(2)O_(4))_(3)],[BF_(4)]^(3-)`
`[Al(C_(2)O_(4))_(3)]^(3+),[BF_(4)]^(3+)`
`[Al(C_(2)O_(4))_(3)]^(3-),[BF_(4)]^(-)`
`[Al(C_(2)O_(4))_(3)]^(2-),[BF_(4)]^(2-)`

SOLUTION :`[overset(+3)Al(C_(2)O_(4))_(3)]^(3-), [overset(+3)BF_(4)]^(-)`
Discussion
1293.

What is the decreasing order of strength of the bases OH^(-), NH_(2)^(-), H - C -= C^(-) and CH_(3) - CH_(2)^(-)

Answer»

`CH_(3) - CH_(2)^(-) gt NH_(2)^(-) gt H - C^(-) gt OH^(-)`
`H - C -= C^(-) gt CH_(3) - CH_(2)^(-)gt NH_(2)^(-) gt OH^(-)`
`OH^(-) gt NH_(2)^(-) gt H - C -= C^(-) gt CH_(3) - CH_(3)^(-)`
`NH_(2)^(-) gt H - C -= C^(-) gt OH^(-) gt CH_(3) - CH_(2)^(-)`

Solution :order of basic strength
`CH_(3) - CH_(2)^(-) gt BAR(N)H_(2) gt HC -= C^(-) gt OH^(-)`
because their acids have following order of acidic strength
`H - OH gt HC -= CH gt NH_(3) gt CH_(3) - CH_(3)`
(conjugate base of strong ACID is weaker while conjugate base of WEAK acid is stronger).
Discussion
1294.

Which chemical principle is involved in choosing a reducing agent for getting the metal from its oxide ore ? Consider the metal oxides, Al_(2)O_(3) and Fe_(2)O_(3) and justify the choice of reducing agent in each case.

Answer»

Solution :The principle is linked with Ellingham diagram. According to it, only that REDUCING agent can be successful whose SELECTION gives a decrease in FREE energy `(DELTAG^(@))`.
Discussion
1295.

Which branched chain isomer of the hydrocarbon with molecular mass 72 gives only one isomer of monosubstituted alkyl halide?

Answer»

Isopentane
Neopentane
Isohexane
Neohexane.

Solution :Neopentane gives only one-substituted ALKYL HALIDE.
`underset("Neopentane")(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(3)underset("Monohalogenation")overset(Cl_(2)//HV)tounderset("Neopentyl chloride")(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)Cl`.
Discussion
1296.

Which of the following will not give test for N in sodium extract?

Answer»

`CH_(5)NHNH_(2)`
`NH_(2)CONH_(2)`
`NH_(2)-NH_(2)`

Solution :The correct ANSWER is (C) because hydrazine is not an organic compound and cannot form `CN^(o-)` WHEREAS a,b,d are organic compounds.
Discussion
1297.

The relation between solubility of a gas in liquid at constant temperature and external pressure is stated by which law?

Answer»

Raoult's LAW
van't HOFF Boyle's law
van't Hoff CHARLE's law
HENRY's law

Solution :Henry's law states the RELATION between solubility of gas in liquid at constant temperature and external pressure.
Discussion
1298.

Which of the following is a natural polymer ?

Answer»

CELLULOSE
CODEL
NYLON
TERYLENE

SOLUTION :Cellulose
Discussion
1299.

Which type of isomerism shown by the product of reaction between benzaldehyde and hydroxyl amine is?

Answer»

SYN and anti
cis and trans
E and Z
NONE of these

Solution :
Discussion
1300.

Which is /are correct statement.

Answer»

`W_("adiabatic")gtW_("isothermal")` in an ideal gas compression from same intial state to same FINAL volume
The volume of `gamma(gamma=C_(p)/C_(v))` remains CONSTANT for diatomic gas at all temperature
Entropy increases when an ideal gas expanded isothermally.
`Delta_(r)H&Delta_(r)S` both are +ve for the decomposition of `MgCO_(3)(s)`.

Answer :A::C::D
Discussion