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14901.

Which of the following is most easily hydrolysed?

Answer»

`SF_(6)`
`NF_(3)`
`CCl_(4)`
`TeF_(6)`

Answer :D
Discussion
14902.

The velocity of a reaction is doubled for every 10^(@)C rise in temperature. If the temperature is raised by 50^(@)C the reaction velocity increases by about

Answer»

12 times
16 times
32 times
50 times

Solution :`{:("Temperature range","CHANGE in velocity of reaction"),(0-10^(@),"2 times"),(10^(@)-20^(@),2^(2)" times"),(20^(@)-30^(@),2^(3)" times"),(30^(@)-40^(@),2^(4)" times"),(40^(@)-50^(@),2^(5)" times"):}`
THEREFORE for `50^(@)` RISE in temperature velocity INCREASES by `2^5` = 32 times.
Discussion
14903.

Which of the following is a sulphide ore ?

Answer»

CARNALLITE 
Magnetite 
COPPER pyrites 
Malachite 

Solution :Chemical formula for magnetite is `Fe_3O_4` malachite is `CuCO_3, CU(OH)_(2)` carnallite is `KCI CDOT MgCl_2 cdot6H_2O` and copper pyrites is `CuFeS_2`therefore copper pyrites is a sulphide ore.
Discussion
14904.

Which of the following are correct statements

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Spontaneous adsorption of gases on solid surface is an exothermic process as ENTROPY decrease during adsorption
FORMATION of micelles takes place when temperature is below Kraft Temperature `(T_k)` and concentration is above CRITICAL micelle concentration (CMC)
A colloid of `Fe(OH)_3` is prepared by adding a little excess (required to completely precipitate `Fe^(3+)` ions as `Fe(OH)_3` ) of NaOH in `FeCl_3` solution the particles of this sol will move towards cathode during electrophoresis.
According to Hardy-Schuize rules the coagulation (flocculating) value of `Fe^(3+)` ION will be more than `Ba^(2+)` or `Na^(+)`

Solution :(A)`DeltaG=DeltaH-TDeltaSltO " " as " " DeltaSltO " " so DeltaH` has to be negative
(B)micelles formation will take place above `T_k` and above CMC
( C)`Fe(OH)_3` sol prepared by the hydrolysis of `FeCl_3` solution adsorbs `Fe^(3+)` and this is positively charged.
`FeCl_3 +3H_2O hArrFe(OH_3)+3HCl , " " Fe(OH)_3+FeCl_3 tounderset("Fixed part.")(Fe(OH)_3)|Fe^(3+), " " underset("Diffused part.")(3Cl^(-))`
Positive charge on colloidal sol is due to adsorption of `Fe^(3+)` ion (COMMON ion between `Fe(OH)_3` and `FeCl_3`)
(D)`Fe^(3+)` ions will have greater flocculatibility power so smaller flocculating value.
Discussion
14905.

Which of the following will be reduced in Cannizzaro reaction with C_(6)H_(5)CHO?

Answer»

p-methoxy benzaldehyde
p-methyl benzaldehyde
p-methoxy benzaldehyde
p-aceto benzaldehyde

Answer :(C,d)
Discussion
14906.

Using IUPAC norms, write the systematic names of the following: [Ni(NH_(3))_(6)]Cl_(2)

Answer»

SOLUTION :Hexaamminenickel(II) CHLORIDE
Discussion
14907.

Which one of the following formula represents equivalent conductance?

Answer»

`I/P CDOT l/a`
`I/P cdot A/l`
`C xxl/a`
`(k xx 10^(-3))/(N)`

Answer :D
Discussion
14908.

Which one of the following is used in silvering of mirrors?

Answer»

Paraldehyde
Benzaldehyde
Acetone
ACETALDEHYDE

SOLUTION :Acetaldehyde
Discussion
14909.

Zr and Hf have almost identical atomic radii. Give reason?

Answer»

Solution :(i) DUE to lanthanoid contraction.
(II) POOR shielding effect.
Discussion
14910.

Which one of the following salt is not used in Antacid ?

Answer»

MAGNESIUM carbonate
Magnesium hydroxide
Sodium bicarbonate
Potassium carbonate.

Answer :D
Discussion
14911.

The standard reduction potential at 25^(@)C for the reduction of water 2H_2O+2e^-

Answer»


ANSWER :A::D
Discussion
14912.

Which one is not correct for a homologous series?

Answer»

All members have a GENERAL formula
all members have same chemical properties
All members have same PHYSICAL properties
All members have same FUNCTIONAL GROUP.

Answer :C
Discussion
14913.

Which is in the decreasing order of boiling points of hydrides?

Answer»

`NH_(3) GT PH_(3) gt AsH_(3) gt SbH_(3)`
`SbH_(3) gt AsH_(3) gt PH_(3) gt NH_(3)`
`PH_(3) gt NH_(3) gt AsH_(3) gt SbH_(3)`
`SbH_(3) gt NH_(3) gt AsH_(3) gt PH_(3)`

ANSWER :4
Discussion
14914.

When formic acid is heated with concentrated H_(2)SO_(4), the gas evolved is

Answer»

only `CO_(2)`
only 'CO'
a mixture of 'CO' and `'CO_(2)'`
a mixture of `'SO_(2)' and 'CO_(2)'`

SOLUTION :`underset("FORMIC ACID")(HCOOH) underset(Delta)overset("Conc."H_(2)SO_(4))rarr H_(2)O + CO UARR`
Discussion
14915.

Which among in following is a chain growth polymer

Answer»

NYLON
BAKELITE
TERYLENE
Teflon

Answer :D
Discussion
14916.

Which one of the following structure represents the peptide chain

Answer»

`-overset(H)overset(|)(N)-overset(|)underset(|)(C)-underset(O)underset(||)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-underset(O)underset(||)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-overset(O)overset(||)(C)-`
`-overset(H)overset(|)(N)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(O)overset(||)(C)-underset(H)underset(|)(N)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(H)overset(|)(N)-underset(O) underset(||)(C)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-`
`-overset(H)overset(|)(N)-underset(O)underset(||)(C)-underset(H)underset(|)(N)-overset(|)underset(|)(C)-NH-overset(O)overset(||)(C)-NH-`
`-overset(H)overset(|)(N)-underset(O)underset(||)(C)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-`

Solution :In peptide LINKAGE i.e.,. -CONH -group , the carboxyl group of one amino acid molecules forms an amide by combination with the amino group of the next amino acid molecule with the liberation of water molecule
Discussion
14917.

What will be the order of reaction and rate constant for a chemical change having log t_(50%) vs log concentration of (a) curves as:

Answer»

0,1
1, 1
2, 2
1, 0

Answer :A
Discussion
14918.

Which of the following can show both tautomerism and optical isomerism

Answer»




ANSWER :B
Discussion
14919.

Which of the following statements is correct about D - Glucose and D - Galactose compounds?

Answer»

They are diastereomers
Both are COMPONENTS of lactose
They are C - 4 epimers
All the above are correct

Answer :D
Discussion
14920.

Which of the following is least soluble in water?

Answer»

`BeCO_(3)`
`MgCO_(3)`
`BrCO_(3)`
`CaCO_(3)`

ANSWER :A
Discussion
14921.

Which one of the following will give a pair of enantiomorphs?

Answer»

`[Cr(NH_(3))_(6)][Co(CN)_(6)]`
`[Co(EN)_(2)Cl_(2)]Cl`
`[PT(NH_(3))_(4)][PtCl_(4)]`
`[Co(NH_(3))_(4)Cl_(2)]NO_(2)`

Answer :B::C
Discussion
14922.

Total number of position isomers of tetrachlorocyclobutane shows geometrical isomerism.

Answer»


SOLUTION :
Discussion
14923.

Thermodynamic predicts that the reaction of H_(2)" with " O_(2) at normal temperature and pressure is spontaneous . However , if a mixture of H_(2) and O_(2)is kept for years in a closed container at normal conditions , no perceptible amount of water is found to be produced . Why does it so happen ?

Answer»

Solution :This happens because of very HIGH activation ENERGY for the formation REACTION of WATER from`H_(2) and O_(2)` . As a result, the reaction occur tooslowly to form even a perceptible amount of water.
Discussion
14924.

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour ?

Answer»

`[NI (NH_(3))_(6)]^(2+)`
`[ZN^(**) NH_(3) )_(6) ]^(2+)`
`[CR(NH_3)_(6)]^(3+)`
`[Co(NH_(3))_(6)]^(3+)`

ANSWER :D
Discussion
14925.

Which of the following can not show linkage isomerism ?

Answer»

`CN^-`
`NO_2^-`
`H_2O`
`SCN^-`

ANSWER :C
Discussion
14926.

Which of the following arrangements shows schematic alignment of magnetic moments of ferromagnetic substances ?

Answer»




SOLUTION :The domainsof feromagnetic substance are ORIENTED inone direction in magnetic moment THUS,it is REPRESENTED as
Discussion
14927.

What is major product formed when 3,3-dimethyl -2-butanol is heated in the presence of H_(2)SO_(4).

Answer»

Solution :Saytezeff's rule: During intramolecular dehydration, if there is possibility to form a CARBON- carbon double bond at different locations, the preferred location is the one that gives the more (highly) SUBSTITUTED alkene i.e., the stable alkene.
For EXAMPLE, the dehydration of 3,3-dimethyl -2- butanol gives a mixture of alkenes. The secondary carbocation, FORMED in this reaction undergoes rearrangement to form a more stable tertiary carbocation.
Discussion
14928.

Which of the following factor is responsible for the Pi character in metal carbon bond (M-C) in carbonyl complexes ?

Answer»

Overlap and DONATION from the LONE pair of C into a vacant (hybrid) metal orbital to form a `M leftarrow C` bond,
Overlap and the donation from a filled `d_(xz)" or "d_(yz)` orbital on M into a vacant antibonding `pi_(p)^(**)` orbital on CO to form a `M rightarrow C` bond
Overlap and the donation from the lone pair on vacant (hybrid) metal orbital into C to form a `M rightarrow C` bond
Overlap and the donation from a filled vacant antibonding `pi_(p)^(**)` orbital on CINTO`d_(xz)" or "d_(yz)` orbital on M to form `M leftarrow C` bond

Answer :B
Discussion
14929.

Which of the aromatic compounds reacts fastest with methoxide ion?

Answer»




ANSWER :B
Discussion
14930.

Which pair is isotonic at same temperature ?

Answer»

0.1 M urea and 0.1 M KCl
0.1 M `Ba(NO_(3))_(2)` and 0.1 M `Na_(2)SO_(4)`
0.2 M NACL and 0.2 M `Na_(2)SO_(4)`
`0.2 M BaCl_(2)` and 0.2 M Sucrose

Answer :B
Discussion
14931.

Which of the following hydrolysed at the fastest rate ?

Answer»




SOLUTION :
Discussion
14932.

which substance acts as superconductor at 4 K ?

Answer»

HG
Cu
Na
Mg

Solution :Hg ACTS as a SUPERCONDUCTOR at 4 K
Discussion
14933.

The red colour of oxyhaemoglobin is mainly due to

Answer»

d - d transition
METAL to LIGAND CHARGE TRANSFER transition
ligand to metal charge transfer transition
intraligand `pi-pi^(**)` transition

Answer :A
Discussion
14934.

Write the IUPAC name of following coordination compounds.Ni(NH_3)_6]CI_2

Answer»

SOLUTION :Hexa-ammine NICKEL (II) CHLORIDE
Discussion
14935.

Write one chemical reaction to illustrate Wacker's process for converting ethylene into ethanal.

Answer»

SOLUTION :`underset("Ethylene")(CH_(2)=CH_(2))+H_(2)O+PdCl_(2) underset("AIR or "O_(2))OVERSET(CuCl_(2))to underset("Ethanal")(CH_(3)CH=)O+Pd+2HCl`
Discussion
14936.

Which metal crystalises in a simple cubic structure?

Answer»

POLONIUM
COPPER
Nickel
Iron

SOLUTION :Polonium is the only metal which crystalliz in a simple CUBIC structure.
Discussion
14937.

Which of the following is the limitation of crystal field theory? (i) Ligands are assumed as point charges. (ii) It does not accounts for the covalent character of bonding between the ligand and the central atom. (iii) It does not explain how colour of coordination compounds depends on ligand attached to central metal atom/ion

Answer»

(i) and (II)
(ii) and (III)
(ii) only
(i), (ii) and (iii)

ANSWER :A
Discussion
14938.

The value of Henry constant K_(H) is

Answer»

greater for GASES with higher solubility.
greater for gases with lower solubility.
constant for all gases.
not related to the solubility of gases.

Solution :is the correct ANSWER. In general, higher the value of `K_(H)` lower is the solubility of gas in a liquid.
Discussion
14939.

Thereagents NH_(4)Cl and NH_(3) will precipitate :

Answer»

`Ca^(2+)`
`Al^(2+)`
`Bi^(2+)`
`MG^(2+)`

Solution :`AI^(3+)` and `Br^(3+)` are PRECIPITATE as their hydroxides `[AI(OH)_(3),Bi(OH)_(3)]` with ammoniumhydroxide in the PRESENCE of ammonium CHLORIDE
Discussion
14940.

Vitamine B_12 contains

Answer»

`Fe`
`CO`
`ZN`
`CA`

ANSWER :B
Discussion
14941.

Which of the following statement is not true for carbon?

Answer»

It forms compounds with multiple bonds.
Its ionization ENERGY is very high.
It undergoes catenation.
It SHOWS inert pair effect.

Solution :Carbon, the FIRST member of group 14 elements does not have d- and f-orbitals and thus does not SHOW inter pair effect.
Discussion
14942.

Which of the following processes is accompanied by an increase in entropy?

Answer»

Normal rubber BAND to stretched rubber band
Normal egg to hard boiled egg
Formation of `NH_3` from `N_2` and `H_2`
All of these

Solution :When an egg is boiled, the entropy increases because denaturation OCCURS RESULTING into a change of PROTEINS and helical form into RANDOM coiled form.
Discussion
14943.

What weight of KMnO_(4) will be required to prepare 250 mL of its N/10 solution if eq.wt of KMnO_(4) " is " 31.6 ?

Answer»

SOLUTION :m.e of `KMnO_(4)` solution `= 1/10 xx250 = 25 ""…(Eqn.1)`
Discussion
14944.

{:(underset(("Colligative properties"))("ColumnI"),underset(("Assume m = M"))underset(("Auueous solution"))"ColumnII"),((A) DeltaT_(f)=0.3xxK_(f),(P)0.1m - ca(NO_(3))_(2)),((B)DeltaT_(b) = 0.28 xx K_(b),(Q) 0.14 m - NaBr),((C)pi=0.19xxRT,(R)0.1m-MgCl_(2)(alpha=0.9)),((D) (P^(0)-P)/(P^(0))=(((DeltaT_(f))/(K_(f))))/((1000/(18))+((DeltaT_(f))/(K_(f)))),(S)0.28m-"Urea"),(,""(T)0.1m-"HA(monobasic acid)""," K_(a)=0.81):}

Answer»

<P>

Answer :(A)P(B)Q,R,S(C)T(D)P,Q,R,S,T
Discussion
14945.

Which one of the following the correct statement?

Answer»

Bleaching powder is a SOURCE of chlorine
Bleaching powder is USED to change hard water to SOFT water
Bleaching powder is obtained by TREATING calcium carbonate with chlorine
Bleaching powder is green in colour Halogen prepared from sea-weeds is

Answer :A
Discussion
14946.

Which of the listed oxidation states is common for all lanthanoids ?

Answer»

`+2`
`+3`
`+4`
`+5`

Solution :+ 3 OXIDATION state is common in all the LANTHANOIDS.
Discussion
14947.

The threshold wavelength for the ejection of electron for metal X is 330 nm. The work function for photoelectric emission from metal X is (h=6.6xx10^(-34)Js)

Answer»

`1.2xx10^(-18)J`
`1.2xx10^(20)J`
`6xx10^(-19)J`
`6xx10^(-12)J`

Solution :Work function
`hv_(0)=(hc)/(lamda_(0))=(6.6xx10^(-34) xx3.0xx10^(8))/(330xx10^(-9))` `=6.0xx10^(-19)J`
Discussion
14948.

When O_(2) is adsorbed on a metallic surface, electron transfer occurs from the metal to O_(2).The truestatement(s) regarding this adsorption is (are)

Answer»

`O_(2)` is physisorbed
heat is released
occupany of `pi ***wp` of `O_(2)` is increased
bond length of `O_(2)` is increased.

Solution :As ELECTRON transfer occurs from the metal to `O_(2)` it is chemisorption.
Adsorption is an exothermic process i.e. heat is released. The electronic configuration of `O_(2)` MOLECULE is
`KK sigma 2s^(2), sigma***2s^(2), sigma2p_(z)^(2),(pi2p_(x)^(2)=pi2p_(y)^(2)),(pi***2p_(x)^(1)=pi***2p_(y)^(1))`
When electron transfer occurs, it occupies `pi**2p_(x)` orbital, so bond order decreases from 2.0 to 1.5 hence, the bond length increases.
Discussion
14949.

Two elements X (atomic weight = 75) and Y (atomic weight = 16) combine to give a compound having 75.8% of X. The formula of the compound is

Answer»

XY
`X_(2)Y`
`XY_(2)`
`X_(2)Y_(3)`.

SOLUTION :`X=75.8%, Y=24.2%. "Find the empirical FORMULA."`
Discussion
14950.

Write the main differences between the structures of starch and cellulose.

Answer»

Solution :100 to 3000 D- glucose units are joined by `alpha` 1, 4 - glycoside LINKAGES and ALSO `alpha` 1, 6 – cross links in starch. 300 to 2500 D- glucose units are joined by `BETA` 1, 4-glycoside linkages in cellulose.
Cellulose has packed arrangement of chains. Hence, it is stiff and hard.
Discussion