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19101.

When Cl_(2) wateris added to an aqueous solution of KI in presence of CHCl_(3) a violet colour is obtained on adding more of Cl_(2)- water, the violet colour disappears and a colourless solution is obtained, this test confirms the presence of which of the following in solution.

Answer»

`CL^(-)`<BR>`Br^(-)`
`I^(-)`
`I^(-),Br^(-)`

SOLUTION :`Br^(-)`
Discussion
19102.

Which of the following statements is true:towards reactivity towards S_N1

Answer»

ALLYL CHLORIDE is more REACTIVE than VINYL chloride
vinyl chloride is as reactive as allyl chloride
Vinyl chloride is more reactive than allyl chloride
Both of them are more reactive than chlorobenzene

Answer :A
Discussion
19103.

What is the highest oxidation state shown by a transition element.

Answer»

SOLUTION :`+8` by OSMIUM.
Discussion
19104.

Which of the following solutions have more relative lowering in vapour pressure at a certain temperature ?

Answer»

90 GRAMS of glucose in 900 grams of `H_(2)O`
34.2 grams of SUCROSE in 450 grams of `H_(2)O`
20 grams of urea in 900 grams of `H_(2)O`
45 grams of glucose in 900 grams of `H_(2)O`

Solution :CALCULATE mole fraction for all
Discussion
19105.

What do you understand by shape selective catalysis ? Why are zeolitesgood shape selective catalysts?

Answer»

Solution :The catalytic reaction that depends upon the pore structure of the catalyst and the SIZE of reactant and product molecules is called shape selective catalysis. Zeolites are good shape selective catalyst because of their honeycomb structure.
The Zeolites are microporous aluminosilicates with three dimensional silicates in which some silicon atoms are replaced by aluminium atoms giving `Al-O-Si` framework. The reaction TAKING place in a zeolite DEPEND upon the size and the shape of the reactant and product molecules as well as upon the pores and cavities of the Zeolites.
Zeolites are being widely used as catalysts in PETROCHEMICAL industries for cracking of hydrocarbons and isomerisation. The Zeolite ZSM-5 converts ALCOHOL to gasoline by dehydrating them to give a mixture of hydrocarbons.
Discussion
19106.

Which does not show mutarotation :

Answer»

Glucose
Fructose
Both (a) and (B)
Sucrose

Answer :D
Discussion
19107.

The secondary valency of Chromium in [Cr(en)_(3)]Cl_(3) is

Answer»

6
3
2
4

Answer :A
Discussion
19108.

Which of the most basic ?

Answer»

`C_2 H_5 NH_2`
`C_6 H_5 NH_2`
`(C_2 H_5)_2 NH`
`C_6 H_5 CH_2 NH_2`

ANSWER :C
Discussion
19109.

Write the overall redox reaction which takes place in the galvanic cell, Pt(s)|Fe^(2+)(aq), Fe^(3+)(aq)||MnO_(4)^(-)(aq), H^(+)(aq),Mn^(2+)(aq)|Pt(s)

Answer»

SOLUTION :At Anode half cell : `5Fe^(2+)_(aq) to 5Fe_((aq))^(3+) + 5E^(Theta)`
At cathode half cell : `MnO_(4(aq))^(-) + 8H_((aq))^(+) + 5e^(Theta) to Mn_((aq))^(2+) + 4H_2O_((l))`
Overall REDOX reaction : `5Fe_((aq))^(2+) + MnO_(4(aq))^(-) + 8H_((aq))^(-) to 5Fe_((aq))^(3+) + Mn_((aq))^(2+) + 4H_2O_(l)`.
Discussion
19110.

Which of the following is not a bacterio static antibiotic ?

Answer»

ERYTHROMYCIN
TETRACYLINE
CHLORAMPHENICOL
PENICILLIN

ANSWER :D
Discussion
19111.

Which one of the following is a cationic detergent ?

Answer»

SODIUM lauryl sulphate
Cetyltrimethylammonium bromide
Sodium dodecylbenzenesulphonate
Glyceryl palmitate

Answer :B
Discussion
19112.

Which of the following reagents is appropriate for converting benzamide to aniline ?

Answer»

`LiAlH_4//` ETHER
`Br_2//NaOH`
`"CC"l_4//NaOH`
`P_2O_5//Delta`

SOLUTION :HOFFMANN bromamide REACTION
Discussion
19113.

What advantage do the fuel cells have over primary and secondary batteries ?

Answer»

Solution :* Primary batteries contain a LIMITED number of reactants and are discharged when the reactants have been consumed.
* Secondary batteries can be recharged but take a LONG TIME to recharge. Fuel cell runs continuously as long as the reactants are SUPPLIED to it and products are removed continuously.
Discussion
19114.

Unlike phosphorus, nitrogen show little tendency for catenation. Or Phosphorus shows greater tendency for catenation than nitrogen.

Answer»

Solution :Due to smaller size, the lone pairs of electons on the two N-atoms REPEL the bond pair of N-N bond. In contrast, because of comparatively LARGER size of P, the lone pairs of electrons on the two P atoms do not repel the bond pair of the P-P bond to the same extent. As a result, N-N single bond is weaker (159 kJ `mol^(-1)`) than P-P single bond (213 kJ `mol^(-1)`). Consequently, NITROGEN shows little tendency for catenation or phosphorus has GREATER tendency for catenation.
Discussion
19115.

Which can have both +ve and -ve odidation states?

Answer»

F
I
Na
He

Answer :B
Discussion
19116.

What will be the mass of one atom of C-12 in grams?

Answer»

SOLUTION :1 mole of C-12 ATOMS = 12 G `=6.022xx10^(23)" atoms"`
Thus, `6.022xx10^(23)` atoms of C-12 have mass = 12 g
`therefore"1 ATOM of C-12 will have mass"=(12)/(6.022xx10^(23))g=1.9926934g.`
Discussion
19117.

The non ideal solution showing positive deviation :

Answer»

have`DELTA`V(mixing)=+ve
have`Delta`H(mixing)=-ve
from MINIMUM boiling azeotropes
have`Delta`V(mixing)=-ve

Answer :A
Discussion
19118.

What is the pH of 1 M CH_3COOH solution? K_a of acetic acid is 1.8 times 10^-5. K=10^-14 mol^2 litre^2.

Answer»

9.4
4.8
3.6
2.4

Solution :`CH_3COO^(-) +H_2O leftrightarrowCH_3COOH+OH^-`
`[OH^-]=C times H`
`h=SQRT((K_w)/K_a TIMESC)=sqrt(10^-14/(1.8 times10^-5) times1)`
`=2.35 times10^-5`
`pOH=4.62`
`thereforepH+pOH=14`
`pH=14-4.62=9.38`
Discussion
19119.

Which of the following would act as flexidentate ligand?

Answer»

`SO_(4)^(2-)`
ETHYLENEDIAMINE
`NH_(2)-NH_(2)`
`CH^(-)`

ANSWER :A
Discussion
19120.

Which of the following substances is involved in all energy transformation reactions in a linving system

Answer»

Calcium
Phosphate
Cyclic AMP
Creatinephosphate

Answer :B
Discussion
19121.

Third transition series starts with the element "…............" and ends at the element"…..............".

Answer»


ANSWER :LANTHANUM, MERCURY
Discussion
19122.

Write the structure of the major organic product in each of the following reaction : C_(6)H_(5)ONa + C_(2)H_(5)Cl to

Answer»

Solution :Reactions giving the structure of main organic product, are as under :
`underset("SODIUM") (C_(6)H_(5)O^(-)NA^(+)) +underset("ETHYL chloride") (C_(2)H_(5) - Cl) to C_(6)H_(5)underset("Phenetole") (-O-) C_(2)H_(5) + NaCl ` (Williamson.s synthesis )
Discussion
19123.

Which of the following statements about enzymes is incorrect :

Answer»

The catalytic ACTION of an enzyme is not specific
An ENZYMATIC reaction is highly sensitive to temperature
The catalytic action of ENZYMES is due to their CAPACITY to lower the energy of activation of a PARTICULAR reaction
None of these

Answer :A
Discussion
19124.

Which of the following is correct about H-bonding in DNA?

Answer»

A - T, G - C
A - G, T - C
G - T, A - C
A - A, T - T

Answer :A
Discussion
19125.

Which of the following compounds is not formed in iodoform reaction of acetone

Answer»

`CH_3COCH_2I`
`CH_3COCHI_2`
`CH_3COCl_3`
`ICH_2COCH_2I`

SOLUTION :
Discussion
19126.

What is the freezing point of a solution containing 6.84g of sucrose per 500g of water ? K_(f) for water is 1.86^(@)C*m^(-1)

Answer»


ANSWER :`-0.074^(@)C`
Discussion
19127.

Two liquids A and B form ideal solutions. At 300 K, the vapour pressure of solution containing 1 mole of A and 3 mole of B is 550 mm Hg. At the same temperature, if one more mole of B is added to this solution, the vapour pressure of the solution increase by 10 mm Hg. The vapour pressure of A and B in their pure state (in mm Hg) respectively are

Answer»

400, 600
500, 500
800, 400
300, 600

Answer :A
Discussion
19128.

Transition element which does not show variable oxidation state is

Answer»

Zn
Sc
Cu
Fe

Answer :B
Discussion
19129.

Which element on reaction with HNO_(3) gives five different products

Answer»

Fe
Cu
Na
Zn

Answer :B
Discussion
19130.

Which is the dispersed phase in Emulsion ?

Answer»

SOLUTION : LIQUID
Discussion
19131.

Which of the following has maximum number of unpaired electrons ?

Answer»

`MG^(2+)`
`TI^(3+)`
`V^(3+)`
`FE^(2+)`

Solution :`Mg^(2+) : 1s^(2)2s^(2)2p^(6), Ti^(3+) = [Ar]`,
`V^(3+) = [Ar] 3d^(1) ""Fe^(2+): [Ar] 3d^(6)`
`therefore " "Fe^(2+)` has maximum number of upaired ELECTRONS i.e. 4
Discussion
19132.

Urnaium is isolated from its ore by dissolving it as UO_2(NO_3)_2 and separating it as solid UO_2(C_2O_4).x H_2OA 1.0 g sample of ore on treatment with nitric acid yielded 1.48 g UO_2(NO_3)_2 which on further treatment with 0.4 g Na_2C_2O_4 yielded 1.23 gUO_2(C_2O_4).xH_2O.Determine weight percentage of uranium in the original sample of x.

Answer»


Solution :Mass of uranium in the sample `1.48/394xx238=0.894 g`
Now, `uderset(3.756)(UO_2(NO_3)_2)+UNDERSET(2.985)(Na_2C_2O_4)+xH_2Oto(UO_2(C_2O_4)xH_2Odarr + 2NaNO_3`
Here `Na_2C_2O_4` is the limiting reagent, therefore , m MOLE of `UO_2(C_2O_4).xH_2O` formed is 2.985.
`IMPLIES M(UO_2(C_2O_4)).xH_2O=1.23/2.985xx1000`=412=238+32+88+18x
`implies x=54/18=3`
Discussion
19133.

Which one of the following is called amphoteric solvent?

Answer»

Ammonium hydroxide
Chloroform
Benzene
Water

Solution :`H_2O to H^+ + OH^-` Acid DUE to donation of proton.
`H_2O+H^+ to H_3O^+`. Base due to accepting a proton. SO water is an amphoteric solvent.
Discussion
19134.

What are pseudo order reaction ? Give example.

Answer»

Solution :The chemical reaction which look like higher order reaction but in REAL they follow lower order kinetics.
For EXAMPLE, `underset"excess"(CH_3COOC_2H_5) + H_2O overset(H^+)to CH_5COOH+ C_2H_5OH`
Rate =`K[CH_3COOC_2H_5]`
Order=1
Discussion
19135.

Which statement is correct with respect to the property of the elements with increase in atomic number in the carbon family?

Answer»

Their metallic CHARACTER decreases
The stability of `+2`OXIDATION state increases
Their ionisation ENERGY increases
Their ATOMIC size decreases

Answer :B
Discussion
19136.

Which of the following would be expected to have the largest antropy per mole

Answer»

`SO_(2)Cl_(2)(s)`
`SO_(2)Cl_(2)(g)`
`SO_(2)Cl_(2)(l)`
`SO_(2)(g)`

SOLUTION :SUPPOSE the no. of gm, 1 gm for each case so the MAX. no. of mole expected for `SO_(2)(g)` which has to expected maximum entropy.
Discussion
19137.

The van't Hoff factor for a solute that associates in solution is

Answer»

ZERO
1
LESS than 1 more tham 1

Solution :`i=("Normal molar mass")/("Observed molar mass")`
Sinces observed molar mass of the SOLUTE is more the the normal mass in case of association, Van'tHoff FACTOR is less than 1.
Discussion
19138.

What is the difference between multimolecular and macromolecular colloids ? Give one example of each. How are associated colloids different form these types of colloids ?

Answer»

SOLUTION :Multimolecular colloids : These are formed when a large number of atoms of SMALLER molecules of a substance AGGREGATE together to form a species having size in the colloidal range e.g., gold sol, sulphur sol (`S_8).`
Macromolecular colloids : These are obtained on dissolution of a macromolecule in a suitable solvent to convert it into colloidal range. These are quite stable and resemble true solutions in many respect. e.g., cellulose, protein etc.
Associated colloids : These colloids behave as strong electrolytes at lower concentrations but at higher concentrations behave as colloids due to the formation of aggregates, called MICELLES. Colloidal BEHAVIOUR is exhibited by them only above a particular temperature, called Kraft.s temperature and a particular concentration called, Critical Micelle Concentration (CMC) e.g. soaps and synthetic detergents.
Discussion
19139.

Which one of the following is a polyamide ?

Answer»

TERYLENE
Nylon-6,6
Bakelite
Buna-S

Answer :B
Discussion
19140.

Which of the following is/are correct for an ideal binary solution of two volatile liquids (eg. Benzene & toluene)?

Answer»

Its vapour is always richer in the more VOLATILE COMPONENT (compared to the liquid).
The liquid will gradually become richer in the less volatile component if such a mixture is boiled (distilled).
The `P_(T)` (ie. The total pressure) above the solution will be the sum of the vapor pressures of the TWO PURE components.
The BOILING point of the solution will be less than the boiling points of the two components.

Answer :A::B
Discussion
19141.

Which of the following reactions will yields phenol ?

Answer»




SOLUTION :PHENOL will be formed in all the three reactionsChlorobenzene will not change to phenol under the reaction CONDITIONS.
Discussion
19142.

Which pair of elements can from alloy ?

Answer»

ZN and Pb
Fe and Hg
Fe and C
C and Pt

Answer :C
Discussion
19143.

Whichmethodis not correctfor refiningofcrudemetals ?

Answer»

Liquation: tin
Zonerefining : SILICON
Mond PROCESS :aluminium
Electrolyticrefining : BLISTER copper

ANSWER :C
Discussion
19144.

w grams of a gas expand isothermally and reversibly at a given temperature T from volume V_1to V_2 . The magnitude of work will be _________ . (assuming these gases as ideal gases)

Answer»

`NH_3gtSO_2gtCl_2gtH_2`
`SO_2gt H_2gtNH_3gtCl_2`
`Cl_2gtNH_3gtSO_2gtH_2`
`H_2gtNH_3gtSO_2gtCl_2`

ANSWER :D
Discussion
19145.

Unit of rate constant for zero order reaction is

Answer»

`MOL L^-1s^-1`
`mol^-1 L s^-1`
`s^-1`
`mol^-2L^2S^-1`

ANSWER :A
Discussion
19146.

The relation between E_("cell")^(@) and K_( c) is given by:

Answer»

`E_("cell")^(@) = (2.303 RT)/(nF) LOG K_( C)`
`E_("cell")^(@) = (2.303 nF)/(RT) log K_( c)`
`E_("cell")^(@) = (2.303 RT)/(nF) xx 1/(log K_( c))`
`E_("cell")^(@) = (2.303 RT)/(nT) log K_( c)`

Answer :A
Discussion
19147.

Vapour pressure increases with increase in

Answer»

Concentration of solution containing non-volatile solute
Temperature UPTO BOILING point
Temperature upto triple poitn
ALTITUDE of the concerned place of boiling

Solution :Vapour pressure becomes identical as the atmospheric pressure at boiling point. If the LIQUID is heated beyond that only evaporation continues, vapour pressure does not RISE further.
Discussion
19148.

Write the IUPAC name of the following compound : (CH_(3))_(3)C CH_(2)Br

Answer»

SOLUTION :`underset("1-Bromo -2, 2- dimethylpropane ") (CH_(3) - underset(CH_(3))underset(|) OVERSET(CH_(3)) overset(|) C - CH_(2)BR) `
Discussion
19149.

Which of the following is/are correct for 2p, orbital :

Answer»

`+ve` and -ve SIGNS represent sign of amplitude of electron wave
Probability of finding the ELECTRONS ALONG xz plane is zero
`+ve`sign represents maximum probability of finding electron and -ve sign represents minimum probability of finding electrons
`2p_y` orbital CONTAINS one radial node

Solution :NA
Discussion
19150.

Why are the elements of group 18 known as noble gases ?

Answer»

Solution :The elements of group 18 have their valence shell orbitals COMPLETELY filled. As a RESULT, they are fairly unreactive and hence are called noble gases. HOWEVER, Xe reacts with highly electronegative elements such as oxygen and fluorine under certain conditioons to form oxides, FLUORIDES and oxyfluorides.
Discussion