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3101.

Which ion is paramagnetic

Answer»

`[NI(H_2O)_6]^(2+)`
`[FE(CN)_6]^(4-)`
`[Ni(CO)_4]`
`[Ni(CN)_4]^(2-)`

Answer :A
Discussion
3102.

Which of the fo llowing statements is correct?

Answer»

OXIDATION numberofoxygen in `KO_(2)` is +1
The specific CONDUCTANCE of an electrolyte SOLUTION decreases with increase in DILUTION
`Sn^(2+)` oxidises `Fe^(3+)`
`Zn//Zn SO_(4)` is a refcrence electrode

Solution :Specific conductance decreases with dilution
Discussion
3103.

Which of the following is a lyophillic colloid ?

Answer»

Milk
Gum
Fog
Blood.

Answer :B
Discussion
3104.

What happens when SO_2 reacts with Cl_2 : (i) in presence of sunlight. (ii) in presence of moisture ?

Answer»

Solution :(i) Sulfuryl CHLORIDE is FORMED
`SO_2 + Cl_2 RARR underset("Sulphuryl chloride")(SO_2Cl_2)`
(ii) `H_2SO_4` is formed :
`SO_2 + H_2O + Cl_2 rarr H_2SO_4 + 2HCL`
Discussion
3105.

Zinc white is a better white pigment than lead because it :

Answer»

Has more covering power than LEAD white
Is not BLACKENED by the ACTION of `H_2S`
Is soluble in water
Becomes yellow when heated

Answer :B
Discussion
3106.

Which does not follow Markownikoff's rule ?

Answer»

`CH_3- CH=CH_2`
` CH_3-CH=CHCH_3`

`CH_3-CH_2- CH = CH_2`

ANSWER :B
Discussion
3107.

The solubility of AgCl will be minimum in

Answer»

`0.1 M CaCl_2`
`0.01 M AgNO_3`
PURE WATER
`0.1 M NH_3`

ANSWER :A
Discussion
3108.

The variety of glass, used for the preservation of eggs is :

Answer»

JENA glass
Safety glass
Water glass
Bottle glass

Answer :C
Discussion
3109.

Which is incorrect statement for XeF_2?

Answer»

It has linear structure
It is hydrolysed rapidly in aqueous solution of a base
It oxidizes `CI^(-) and I^(-)" to "Cl_2 and I_2` respectively
It cannot act as `F^(-)` donor.

Solution :It act as a `F^(-)` donor and forms complexes with covalent fluroides like `PF_(6), AsF_(6) and SbF_(5)`.
`XeF_(2)+PF_(5) to [XeF]^(+) [PF_(6)]^(-)`
(a) The five electron pairs form trigonal bipyramidal with three lone pairs in equatoríal positions. HENCE, the structure of `XeF_(2)`, becomes linear in ACCORDANCE with VSEPR theory.
Discussion
3110.

Which of the following statements is not correct regarding physical adsorption?

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Adsorption increases with INCREASE in
Adsorption in spontaneous
Both ENTHALPY and ENTROPY of adsorption are negative.
Adsorption on solids is riversible.

SOLUTION :Adsorption decrease with increase in temperature.
Discussion
3111.

Which of the following in incorrect match

Answer»

Stability `H_(2)OgtH_(2)SgtH_(2)SegtH_(2)Te`
BOND enthalpy : `H_(2)OgtH_(2)SgtH_(2)SegtH_(2)Te`
KA `H_(2)OgtH_(2)SgtH_(2)SegtH_(2)Te`
B.P : `H_(2)SltH_(2)SeltH_(2)TeltH_(2)O`

ANSWER :C
Discussion
3112.

Waterboils at lower temperature on high altitudes because

Answer»

atmospheric pressure is high there
atmospheric pressure is lower there
water is WEAKLY Hydrogen bonded there
water in PURE from is found there

Answer :B
Discussion
3113.

triangleS for the reaction, MgCO_3(s)rarrMgO(s)+CO_2(g) will be

Answer»

ZERO
`-ve`
`+ve`
`INFTY`

ANSWER :C
Discussion
3114.

What is the relationship between Gibbs free energy of the cell reaction in a galvanic cell and the emf of the cell ? When will the maximum work be obtained froma galvanic cell ?

Answer»

Solution :If concentration of all reacting species is unity, then `E_("cell")=E_("Cell")^(@)` and `DeltaG^(@)=-nFE_("cell")^(@)`
where, `DeltaG_(r)G^(@)` is STAN dard GIBBS energy of the reaction
`E_("cell")^(@)=` emf of the cell
`nF=`charge PASSED
If we want to obtain m aximum WORK from a galvanic cell then charge has to be passed reversible.
The reversibly work done by a galvanic cell is equal to decrease in its Gibbs energy
`Delta_(r)G=-nFE_("cell")`
As `E_("cell")`is an intensive parameter but `Delta_(f)=G` is an EXTENSIVE thermodynamic property and thevalue depends on n.
For reaction, `Zn(s)+Cu^(2+)(aq)rarrZn^(2+)(aq)+Cu(s)` in a galvanic cell.
`Delta_(r)G=-2FE_("cell")` [Here,n=2]
Discussion
3115.

The standard reduction potentials E^(@) for the half reactions are as zn to Zn^(2+) + 2e^(-) , E^(@) = 0.76 V Fe to Fe^(2+) + 2e^(-), E^(@) = 0.41 V The EMF for the cell reaction Fe^(2+) + 2e^(-), E^(@) = 0.41 V The EMF for the cell reaction Fe^(2+) + Zn to Zn^(2+) + Fe is

Answer»

`-0.35` V
0.35 V
1.17 V
`-1.17`V

ANSWER :B
Discussion
3116.

Which one of the following is an antibiotic?

Answer»

ERYTHROMYCIN
atenolol
amlodipine
propranolol

Solution :erythromycin
Discussion
3117.

The true statement amongst the following is :

Answer»

S is a function of temperature but `DeltaS` is not a function of temperature
Both `DeltaS ` and are FUNCTIONS of temperature.
S is not a function of temperature but `DeltaS` is a function of temperature.
Both `S and DeltaS` are not functions of temperature.

ANSWER :B
Discussion
3118.

Which one of the following is called amphoteric solvent

Answer»

Ammonium hydroxide
Chloroform
Benzene
Water

Solution :`UNDERSET("Acid")(H_(2)O) rarr H^(+) + OH^(-)` [Acid due to donation of PROTON]
`underset("Base")(H_(2)O) + H^(+) rarr H_(3)O^(+)` [Basic due to gaining of proton]
Discussion
3119.

Which of the following does not react with Hinsberg's reagent ?

Answer»

`C_2 H_5 NH_2`
`(C_2 H_5)_2 NH`
`(C_2 H_5)_3 N`
`CH_3 NH_2`

ANSWER :C
Discussion
3120.

Which is the formula for PHBV ?

Answer»

`[--O-underset(CH_(3))underset("|")"CH"-CH_(2)-COO-underset(CH_(3))underset("|")"CH"-CH_(2)-CO--]_(N)`
`[--O-underset(CH_(3))underset("|")"CH"-CH_(2)-COO-underset(CH_(2)CH_(3))underset("|")"CH"-CH_(2)-CO--]_(n)`
`[--O-underset(CH_(3))underset("|")"CH"-COO-underset(CH_(2)CH_(3))underset("|")"CH"-CH_(2)-CO--]_(n)`
`[--underset(CH_(3))underset("|")"CH"-CH_(2)-COO-underset(CH_(2)CH_(3))underset("|")"CH"-CH_(2)-CO--]_(n)`

ANSWER :B
Discussion
3121.

Which gives apple green colour in fireworks ?

Answer»

Na
K
Ba
Ca

Answer :C
Discussion
3122.

The vapour pressure of a solution having solid as solute and liquid as solvent is:

Answer»

DIRECTLY PROPORTIONAL to MOLE FRACTION of the solvent
Inversely proportional to mole fraction of the solvent
Directly proportional to mole fraction of the solute
None of these

Answer :A
Discussion
3123.

Which of the following metals is obtained by self reduction process ?

Answer»

Cr
Hg
Ni
Zn

Answer :B
Discussion
3124.

Which of the following concentration cells with produce maximum E_("cell") at 298 K [Take P_(H_2)=1.0 atm in each case.]

Answer»

`PT|H_2(g)|H^(+)(0.01M)||H^(+)(0.1 M) |H_2(g)|Pt`
`Pt|H_2(g)|NH_4Cl(0.01 M)||HCl (0.1 M) |H_2(g)|Pt`
`Pt|H_2(g)|H^(+)(0.1 M)||H^(+) (0.2 M) |H_2(g) | Pt`
`Pt|H_2(g)|H^(+)(pH=0.0)||H^(+)(pH=0.0)|H_2(g)|Pt`

Solution :SINCE `(H^+)` given by `NH_4Cl` will be less than 0.01 M so CELL emf will be more . `E_("cell")` increases as concentration of CATHODIC compartment increases.
Discussion
3125.

When 1 mol CrCl_(3).6H_(2)O is treated with excess of AgNO_(3), 3 mol of AgCl are obtained. The formula of the complex is

Answer»

`[CrCl_(3)(H_(2)O)_(3)].3H_(2)O`
`[CrCl_(2)(H_(2)O)_(4)]Cl.2 H_(2)O`
`[CrCl(H_(2)O)_(5)]Cl_(2).H_(2)O`
`[CR(H_(2)O)_(6)]Cl_(3)`

Solution :Similar to 3 above/ FORMULA will be `[Cr(H_(2)O)_(6)]Cl_(3)`.
Discussion
3126.

Which element shows polymorphism ?

Answer»

O
S
Se
All

Answer :D
Discussion
3127.

Which is a preservative ?

Answer»

Phenol
NaOH
Toluene
Sodium benzoate.

Answer :D
Discussion
3128.

Which are not charateristic of thermosetting plastic ?

Answer»

Once GIVEN a shape can't be remoulded.
Can be given different shape by heating .
Less BRANCHED LINEAR polymer.
Hightly branched cross LINKED polymer.

Solution :N//A
Discussion
3129.

Which point defect decreases the density of a solid ?

Answer»

SOLUTION :SCHOTTKY DEFECT.
Discussion
3130.

Which element forms the oxide of highest valency ?

Answer»

V
Cr
Mn
Fe

Answer :C
Discussion
3131.

Write the IUPAC name of following coordination compounds.[Cr(NH_3)_6]^(3+)

Answer»

SOLUTION :Hexa-ammine CHROMIUM (III) ION
Discussion
3132.

The term "sorption" stands for ........

Answer»

ABSORPTION 
ADSORPTION 
both absorption and adsorption 
desorption 

SOLUTION :The SIMULTANEOUS absorption and adsorption is called sorption.
Discussion
3133.

Write the cell reactions for a) Ni//Ni^(2+)// //Cu^(2+)//Cu b) Cu^(2+)//Cu"//"Cl^(-) 1/2 Cl_(2)

Answer»


ANSWER :
Discussion
3134.

What are the units of Vanderwaals constants a' and b' ?

Answer»

atm `L^(2) MOL^(-2)`
atm `L^(-2) mol^(-2)`
atm L `mol^(-1)`
atm `mol L^(-1)`

Answer :A
Discussion
3135.

Using IUPAC norms, write the systematic names of the following: [NiCl_(4)]^(2-)

Answer»

SOLUTION :Tetrachloridonickelate(II) ION
Discussion
3136.

The standard Gibbs free energy change (DeltaG^(@)) at 25^(@)C for the dissociation of N_(2)O_(4)(g) to NO_(2)(g) is (given, equilibrium constant = 0.15, R=8.314 JK^(-) mol^(-1))

Answer»

1.1 KJ
4.7 KJ
8.1 KJ
38.2 KJ

Solution :`DELTAG^(@)=-RTlnk`
Discussion
3137.

Which of the following compounds shows evidence of the strongest hydrogen bonding

Answer»

Propane-1-ol
Propane-2-ol
Propane-1,2-diol
Propane-1,2,3-triol

Solution :Propane-1,2,3-triol or glycerol has very high BOILING POINT i.e., `290^(@)C` , The high VISCOSITY and high boiling point of glycerol are due to ASSOCIATION of glycerol molecules through extensive INTERMOLECULAR hydrogen bonding due to presence of three polar-OH group
Discussion
3138.

Which will have highest melting point ?

Answer»




SOLUTION :
Discussion
3139.

When nitro methane condenses with acetone it gives

Answer»

1-nitro-2-propanol
1-nitro-2-methoxy propane
1-nitro-2-methoxy-ethanol
1-nitro-2-methoxy-propanol

Answer :D
Discussion
3140.

What are the applications of the principle of depression in freezing point ?

Answer»

Solution :The applications of the principle of depression in freezingpoint are :
(1) In cold countries the frozen ice on roads and footpaths during winter is melted by spraying salts like sodium chloride or `CaCl_(2)` which depresses the freezing point of water.
(2) De-icingof aeroplances and airports is carried out by using salts.
(3) Ethylene glycol is USED as a COMMON automobile antifreeze since it is NONVOLATILE and soluble in water. Therefore it is ALSO used as COOLANT in automobile radiators.
Discussion
3141.

Which of the following has cross -links

Answer»

Vulcanised rubber
Nylon
Phenol-formaldehyde RESINS
Both (a) and (C) are CORRECT

ANSWER :D
Discussion
3142.

Which of the following compounds can exhibits both geometrical and optical isomerims?

Answer»




all of these

Answer :B
Discussion
3143.

What happens when H_2S is passed through aqueous solution of ZnCl_2? Give equation.

Answer»

Solution :A WHITE precipitate of zinc sulphide is formed.
`ZnCl_2 + H_2S RARR ZNS + 2HCl`
Discussion
3144.

Which of the following metal sulphide liberate H_(2)S gas on reaction with dil HCl.

Answer»

ZnS
SnS
CdS
CuS

Solution : , (more STABLE cyclopropyl METHYL CARBOCATION)
Discussion
3145.

Which of the following cations does not form an amine complex with excess of ammonia:

Answer»

`Ag^+`
`CU^(2+)`
`CD^(2+)`
`NA^+`

Answer :D
Discussion
3146.

Which of the following is not true with respect to Ellingham diagram ?

Answer»

Free energy CHANGES follow a straight line. Deviation occurs when there is a PHASE change.
The graph for the FORMATION of `CO_(2)` is a straight line almost parallel to free energy axis.
Negative slope of `CO` shows that it becomes more stable with increase in temperature.
Positive slope of metal oxides shows that their stabilities decrease with increase in temperature.

Answer :B
Discussion
3147.

Which of the following antibiotic is bacteria static ?

Answer»

Aminoglycosides
Penicillin
Ofloxacin
Tetracycline 

ANSWER :D
Discussion
3148.

Write the structures of (i) N-methylethanamine and (ii) 2-aminotoluene.

Answer»

SOLUTION :(i) `UNDERSET("N-Methylethanamine")(CH_(3)-NH-CH_(2)CH_(3))`
(II).
Discussion
3149.

As electrolysis is in progress, if the cathode plate is removed

Answer»

the MOVEMENT of ions STOPPED
the ions move at RANDOM
all ions move towards ANODE
only anions move towards the anode
Discussion
3150.

Which of 0.1 M HCl and 0.1 M KCl do you expect to have greater underset(m)overset(0)(wedge) and why?

Answer»

Solution :The CONCENTRATION of HCL and KCl are same but MOLAR conductivity of HCl is higher. Since SMALLER the cation higher the molar conductivity. `H^(+)` ions are smaller when compared to `K^(+)` ions. 0.1 M HCl will have greater molar conductivity `(wedge_(m))`.
Discussion