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15251.

Which defines the standard reduction electrode potential of Zn^(2+) ions

Answer»

`Zn^(2+) (aq) + 2 E^(-)to Zn(s) , [Zn^(2+)] = 1 M`
`Zn(G) to Zn^(2+) + 2E^(-) , [Zn^(2+)] = 1 M`
`Zn^(2+) (aq) to Zn(s) + 2e^(-) , [ Zn^(2+)] = 1 M`
`Zn^(2+) (g) + 2 e^(-)to Zn(s) - 2e^(-), [Zn^(2+)] = 1 M`

Solution :`E^(@) = E ` , when `[Zn^(2+)] = 1M`,
Also process is `Zn^(2+) (aq)+ 2e to Zn(s)`
Discussion
15252.

Which one of the following is not dissolved in dilute hydrochloric acid ?

Answer»

MnS
ZnS
`BaCO_(3)`
`BaSO_(4)`

ANSWER :D
Discussion
15253.

Write the formula of (i) hexaaquairon (II) sulphate (ii) potassium hexacyanoferrate (III) (iii) hexaammine platinum (IV) chloride (iv) potassium trioxalatoaluminate (III).

Answer»

Solution :(i) `[Fe(H_(2)O)_(6)]SO_(4)` (II) `K_(3)[Fe(CN)_(6)]` (III) `[Pt(NH_(3))_(6)]Cl_(4)` (iv) `K_(3)[Al(C_(2)O_(4))_(3)]`
Discussion
15254.

What are paramagnetic materials ? Give examples.

Answer»

Solution :PARAMAGNETIC materials : These materials are attracted by magnetic fields. They contain permanent magnetic DIPOLES due to presence of atoms, IONS or molecules with unpaired electrons. Eg, `O_(2), Cu^(2+), Fe^(2+) and Cr^(3+)` etc. The magnetic dipoles are REPRESENTED by ARROWS.
Discussion
15255.

Which of the following is not true for H_2SO_4?

Answer»

LOW volatility
strong AFFINITY with `H_2O`
ACT as OXIDISING agent
more volatility

Answer :D
Discussion
15256.

Which of the following alloy is not used to make resistance wire?

Answer»

Nitinol
German silver
Nichrome
Cupronickel

Answer :A
Discussion
15257.

Which of the following element having one electron in 5d orbital in its electronic configuration ?

Answer»

Pm
Tb
Nd
Gd

Answer :D
Discussion
15258.

While charging lead storage battery

Answer»

`PbSO_4` on cathodc is reduced to Pb
`PbSO_4` on ANODE is oxidised to `PbO_2`
`PbSO_4` on anode is reduced to Pb
`PbSO_4` on cathode is oxidised to Pb

SOLUTION :CHARGING : anode : `PbSO_(4)(s) + 2e^(-) to Pb(s) + SO_4^(2-) (aq)`
Cathode : `PbSO_4(s) + 2H_2O(l) to PbO_2(s) + SO_4^(2-) (aq) + 2e^(-)` .
Discussion
15259.

When 1 mole of NH_4OH is neutralised by 1 mole of HCl, heat evolved is:

Answer»

57.2kJ
greater than 57.2 kJ
less than 57.2 kJ
None of these

Answer :C
Discussion
15260.

Which of the following does no belong to same group ?

Answer»

ZN, CD, Hg
CU, Ag, pt
Cr, MO, W
Sc, Y, La

ANSWER :B
Discussion
15261.

Which of the following are pseudohalides:

Answer»

ONC
`OCN^-`
`SCN^-`
All

Answer :D
Discussion
15262.

Vitamin B_(6) is known as

Answer»

PYRIDOXINE
Thiamine
Tocopherol
Riboflavin

Answer :A
Discussion
15263.

What are ferromagnetic substances ?

Answer»

Solution :The substances wihich are strongly attracted by external magnetic FIELD and do not lose their MAGNETISM even when the external magnetic field is removed, are called ferromagnetic substances.
Example `Fe, CO, Ni, CrO_(2), GD`.
Discussion
15264.

Which of the following factor (s) affect the solubility of a gaseous solution in the fixed volume of liquid solvent? (i) Nature of solute (ii) Temperatute (iii) Pressure

Answer»

<P>(i) and (III) at CONSTANT T
(i) and (II) at constant P
(ii) and (iii) only
(iii) only.

Solution :are the correct answer.
Discussion
15265.

When Na_2S is added to sodium nitroprusside solution:

Answer»

Beautiful viloet colour is produced
A COMPLEX `[FE(CN)_5 NOS]^(4-)` is formed
The complex `Na_4[Fe(CN)_5 NOS]` is formed
All

Answer :D
Discussion
15266.

Which of the following compounds is a good conductor of electricity in solution state?

Answer»

Covalent
Molecular
Metallic
Ionic

SOLUTION :Ionic compounds are dissociated in solution STATE and form ions. Ions are good carrier of CHARGE which make solution CONDUCTING
Discussion
15267.

Thomas slag is :

Answer»

`FeSiO_(3)`
`CaSIiO_(3)`
`Ca_(3)(PO_(4))_(2)`
`MnSiO_(3)`

ANSWER :C
Discussion
15268.

Which of the following statement (s) are wrong?

Answer»

Photons having energy `400 kJ` will break `4` mole bonds of a moiecule `A_(2)` where `A-A` bond dissociation energy is `100 kJ//mol`.
TWO bulbs are emitting light having wavelenght `2000Å` & `3000 Å` respectively. If the bulbs `A` & `B` are `40` watt and `30` watt respectively then the ratio of no. of photons emitted by `A` & `B` PER day is `1:2`
When an electron make transition from LOWER to higher orbit, PHOTON is emitted.
None of these

Solution :(A) Since the NUMBER of photons is not specified `("it may or may not be equal to" 4 N_(A))`. So, this statement is not always true.
(B) No. of photon emitted per day xx Energy of one photon =energy emitted per day.
For bulb `A, n_(e_(A))xx12400/2000xx1.6xx10^(-19)=40xx24xx3600`
For bulb `B, n_(e_(B))xx12400/3000xx1.6xx10^(-19)=30xx24xx3600`
`:. n_(e_(A)): n_(e_(B))=8:9`.
Discussion
15269.

Write the general structure of Zwitter ion.

Answer»

SOLUTION :
Discussion
15270.

Which of the following expressions correctly represents the relationship between the average molar kinetic energy bar(KE) of CO and N_(2) molecules at the same temperature ?

Answer»

`bar( KE) ( CO) =bar( KE) ( N_(2))`
`bar( KE) ( CO) gtbar( KE) ( N_(2))`
`bar( KE) ( CO) ltbar( KE) ( N_(2))`
cannot be predicted unless that VOLUME of the gases are GIVEN.

Solution :Kinetic energy of a gas depends only on TEMPERATURE.
Discussion
15271.

What type of defect can arise when a solid is heated ?

Answer»

SOLUTION :VACANCY DEFECT.
Discussion
15272.

What are carbohydrates ?

Answer»

SOLUTION :CARBOHYDRATES are optically active polyhydroxy aldehydes or polyhydroxy KETONES or the compounds which PRODUCE such units on HYDROLYSIS.
Discussion
15273.

Vitamin B_(12) is rich in

Answer»

MEET
Fish
Egg
all

Answer :D
Discussion
15274.

When ammonical solution of common salt is saturated with carbon dioxide we get:

Answer»

`NH_4HCO_3`
`(NH_4)_2 CO_3`
`NaHCO_3`
`MgCO_3`

ANSWER :C
Discussion
15275.

Which metal is not present in German silver ?

Answer»

Cu
Ni
Zn
Sn

Answer :D
Discussion
15276.

Which of the following products is obtained by the oxidation of propionaldehyde

Answer»

ACETIC acid
Formic acid and acetic acid
Propanoic acid
n-propyl alcohol

Solution :`UNDERSET("Propanal")(CH_(3)-CH_(2)-CHO) overset("Oxidation")rarr underset("Propanoic acid")(CH_(3)CH_(2)-COOH)`
Discussion
15277.

Which statements is/are correct ?

Answer»

In voltaic cell OXIDATION occurs at at anode
In an electrolitic cell reduction occurs at cathode
In a CONDUCTIVITY cell electrolysis does not take place
`H^(+)` has greater CONDUCTANCE then `OH^(-)`

Solution :In voltic cell oxidation occur at anode
anode ` Zn//Z^(+2)////Cu^(+2)//Cu`
`(-ve)"anodecathode" Zn to 2e^(-) + Zn^(+2)`
chemical energy ` to` electrical energy , In electrolytic cell reduction occur at cathode cathode Electrical energy ` to ` Chemical energy at cathode `B^(+) + E^(-) to ` B (reduction )
Discussion
15278.

Which of the following is isobutyric acid

Answer»




ANSWER :C
Discussion
15279.

Using the electrochemical series table, explain why Cu (I) sulphate does not exist in aqueous solution

Answer»

Solution :Positive `E^@` VALUE of `2CU^+ to CU^(2+)+Cu`
shows that Cu (l) is not STABLE
Discussion
15280.

Thermal decomposition of gaseous ammonia is a zero order reaction. What is the catalyst in this case?

Answer»

SOLUTION :PLATINUM
Discussion
15281.

Which of the following statements are correct for SO_(3) gas? I) It act are bleaching agent in moist conditions II) It's molecule has linear geometry III) It's dilute solution is used as disintectant IV) It can be prepared by the reaction of dilute H_(2)SO_(4) with Metal sulphide

Answer»

I and III
II and IV
I and IV
II and III

Solution :`SO_(2)` is bent (or) V-shape molecule and it is preparedin the ACTION of concentrated`H_(2)SO_(4)` on metal sulphide.
Discussion
15282.

Which of the following combinations is not allowed (assume z - axis as internuclear axis) ?

Answer»

2S and 2s
`2p_(X)` and `2p_(x)`
2s and `2p_(Z)`
`2p_(x)`and`2p_(y)`

ANSWER :D
Discussion
15283.

Which of the following is non -existent

Answer»

`AlF_(6)^(3-)`
`COF_(6)^(3-)`
`BF_(6)^(3-)`
`SiF_(6)^(2-)`

Solution :Maximum covalency of B is only 4as it does not have d-orbitals `(1S^(2)2s^(2)2P^(1))`
Discussion
15284.

Write the IUPAC name of the following complex:K_2[HgI_4]

Answer»

SOLUTION :POTASSIUM tetraiodomercurate (II)
Discussion
15285.

Which is incorrect physical property order for the given alkaline earth metals?

Answer»

Metallic RADIUS : `Ba gt Sr gt CA gt Mg gt Be`
Reducing NATURE : `Ba Sr gt Ca gt Mg gt Be`
Density : `Ba gt Sr gt Be gt Mg gt Ca`
NEGATIVE hydration enthalpy : `Be^(2+) gt Mg^(2+)gt Ca ^(2+)gt Ba^(2+) gt Sr^(2+)`

Answer :D
Discussion
15286.

Which of the following is non biodegradable ?

Answer»

Nylon-6
POLYESTER
PGA
Daxtran

Solution :Polyester
Discussion
15287.

What is meant by non-ideal solution showing the positive deviation from Raoults law?

Answer»

SOLUTION :If the VAPOUR pressure of solution is GREATER than the expected from Raoult's LAW, then that solution is called non-ideal solution showing deviation from Raoult's law.
Discussion
15288.

Which of the following ions dissolve in excess of aq. NH_(3)

Answer»

`Al^(3+)`
`CU^(2+)`
`AG^(+)`
`ZN^(2+)`

Answer :B::C::D
Discussion
15289.

What is the role of limestone in the extraction of iron from red haematite?

Answer»

Solution :Lime acts as a flux. So in the REMOVAL of GANGUE forms FUSIBLE material, called SLAG.
`CaCO_3 rarr CaO` +CO_2`
`SiO_2 + CaO rarr CaSiO_3`
Discussion
15290.

The test used for identifying peptide linkage in protein is

Answer»

Ninhydrin TEST
Biuret test
Borsche's test
Molisch's test

Solution :Biuret test GIVES BLUISH violet colour due to the presence of `-CO- NH-` GROUP
Discussion
15291.

Which of the following on Hoffmann's bromamide reaction gives alkanamine?

Answer»

`RCH_2NH_2`
` RCONHR'`
` RCONH_2`
` RCOONH_4`

ANSWER :C
Discussion
15292.

Which of the following statements regarding acetanilide is not true ?

Answer»

It is a weaker base than aniline
It is less REACTIVE TOWARDS electrophilic substitution than aniline
Nitration of acetanilide gives p-isomer as major product

SOLUTION :The N-phenyl derivative of the amide of any ACID is KNOWN as anilide. Acetanilide is N-phenyl derivative of acetamide. Its structure is
Discussion
15293.

Which one of the following is an example for globular protein?

Answer»

KERATING
Myoglobe
COLLAGEN
Etastin

ANSWER :B
Discussion
15294.

Which of the following observations is correct andis used in the identification of carboxylic acids

Answer»

Carboxylic acids liberates `CO_(2)` gas from `NaHCO_(3)` SOLUTION
They produce FRUITY SMELL of esters when heated with alcohol in presence of conc. `H_(2)SO_(4)`.
Both (a) and (b)
Iodoform test

Solution :`RCOOH + NaHCO_(3) rarr RCOONa + H_(2)CO_(3) rarr CO_(2)`
(`RCOOD` more acidic than `H_(2)CO_(3)`)
Hence carboxlyic ACID liberates `CO_(2)` from solidum bicarbonate solution.
`RCOOH + R'OH overset("conc." H_(2)SO_(4))rarr underset((" Fruity smell"))underset(" Easter")(R-COOR' + H_(2)O)`
Hence they give fruity smell when warmedwith alcohol in the presence of conc. `H_(2)SO_(4)` Hence choice (c ) is CORRECT as (a) and (b) both are correct. Any carboxylic acid even `CH_(3)COOH` does not give iodoform test as the H-atom attached to C is not more acidic than H-atom attached to O. Hence (d) is incorrect.
Discussion
15295.

Which one of the following is not a common component Photochemical Smog

Answer»

Acrolein
Chlorofluorocarbons
Ozone
Peroxyacetyl nitrate

Answer :B
Discussion
15296.

Write the equations for the preparation of 1-bromobutane from : (i) "1-butanol"""(ii)"but -1-ene"

Answer»

Solution :(i) BUTANOL `to` bromobutane
`CH_(3)CH_(2)CH_(2)CH_(2)OHoverset(SOCl_(2))toCH_(3)CH_(2)CH_(2)CH_(2)CL`
(II) But -1-ene `to` Brombutane
`CH_(3)CH_(2)CH_(2)CH_(2)+HBroverset("PEROXIDE")toCH_(3)CH_(2)CH_(2)CH_(2)Br`
Discussion
15297.

Which of the followings is not correct about colloids?

Answer»

The`[H]^(+)` at which COLLOID PARTICLES do not carry CHARGE is called isoelectric point of colloid
At isoelectric point colloidal state possess minimum stability
At isoelectric point sol particles possess no electrophoretic motion
Silicic ACID sol have minimum stability at its isoelectric point

Solution :It is an EXCEPTION and the silicic acid sol possess maximum stability.
Discussion
15298.

Where does the water present in the egg go after boiling the egg ?

Answer»

SOLUTION :On boiling, during denaturation process water GETS ABSORBED in denaturated PROTEINS.
Discussion
15299.

violet coloured complex obtained in the detectiomn of sulphuris :

Answer»

`Na_(2)[Fe(NO)(CN)_(5)]`
`Na_(3)[Fe(ONSNa)(CN)_(5)]`
`Na_(4)[Fe(CN)_(5)NOS]`
Both (b) and (c)

SOLUTION :Both (b) and (c ) are the same .
Discussion
15300.

Which one of the following metals is used in the filaments of photo-electric cells that convert light into electric energy ?

Answer»

Tungsten
Copper
Rubidium
Aluminium

Solution :The PERMANENT hardness of water is due to PRESENCE of chloride and SULPHATES salts of calcium and magnesium . This type of hardness of can be removed by Calgon's method , Ion-exchange method and treatment with washing soda . Boiling can REMOVE only the temporary hardness of water but not permanent hardness.
Discussion