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4701.

What is the (i) volume of gases evolved at STP and (ii)pH of solution on the electrolysis of 10L of the following solutions when 1F of electricity is passed : a. Aqueous solution of Na_(2)SO_(4) b. Aqueous solution of CH_(3)COONa c. Aqueous solution of HCOOK

Answer»

Solution :`a.`
`i.` Since `E^(c-)._(red)` of `H_(2)gtE^(c-)._(red)` of `Na^(o+)` ion.
and `E^(c-)._(o x i d)` of `H_(2)OgtE^(c-)._(o x i d e)` of `SO_(4)^(2-)` ion.
So the reduction and oxidation of `H_(2)O` takes place to give `H_(2)(` CATHODE `)` and `O_(2)(` anode `)` , RESPECTIVELY.
At cathode`:`
`H_(2)O+e^(-) rarr overset(-)(O)H+(1)/(2)H_(2)(g)""(` Reduction `)`
At anode `:`
`H_(2)O rarr (1)/(2)O_(2)(g)+2H^(o+)+2e^(-)""(` Oxidation `)`
First method
At cathode `:`
`1e^(-)+1F=(1)/(2)mol `of`H_(2)=(22.4)/(2)L` at `STP`
`=11.2 L `of `H_(2)`
At anode `:`
`2e^(-)=2F=(1)/(2) mol `of `O_(2) =(22.4)/(2)L` at `STP`
`:. 1F=(22.4)/(2x2) =5.6L` or `O_(2)`
Total volume of gases at `STP=11.2+5.6=16.8L`
Second method
At cathode `:`
`1F=1Eq O_(2)=(22.4)/(4)L=11.2L H_(2)`
`(n` factor for `O_(2)=4)`
Total volume `=(11.2 +5.6=16.8L)`
`ii. pH` of solution
Since `overset(c-)(O)H` ions are formed at cathode and `H^(o+)` ions are formed at anode. So they will remaing in the solution and will neutralize to give neutral solution.
At cathode `:`
`1F=1Eq OH`
`[overset(-)(O)H]=("Equivalent")/("Volume in L")=(1)/(10)N` or `M`
at anode `1F=1Eq of H^(o+)`
or `2F=2 mol`of `H^(o+)`
`[H^(o+)]=(1)/(10)N` or `M`
Therefore, `0.1M overset(-)(O)H` ion will neutralize `0.1 M H ^(o+)` ion to give neutral solution with `pH=7`

`b.`
`i. CH_(3)COONa(ag)overset(El e ctrolysis)rarr CHCOO^(ddot(c-))+Na^(o+)`
Since `E^(-)._(red )` of `H_(2)Ogt E^(c-)._(red)` of `Na^(o+)` ion,so reduction of water takes place at cathode to give `H_(2)(g)`.
At cathode `:`
`H_(2)O+e^(-) rarr overset(-)(O)H+(1)/(2)H_(2)uarr""(` Reduction `)`
At anode `:`
Kolbe's reaction `:`

At anode, the oxidation of `CH_(3)COOoverset(ddot(c))` takes place to give `2 mol ` of `CO_(2)(g)` and ` mol ` of ethane `(C_(2)H_(6))` gas.
At cathode `:`
`1e^(-)=1F=(1)/(2) mol `of `H_(2)=(22.4)/(2)=11.2L` of `H_(2)`
At anode `:`
`2e^(-)=2F=(2mol ` of `CO_(2)+1 mol` of `C_(2)H_(6))`
`:. 2F=3 mol ` of gases
`1F=(3)/(2) mol` of gases
`=(3)/(2)xx22.4 L` at `STP`
`=33.6 L` at `STP` ltbtgt Total volume of gases at `STP =(11.2+33.6)`
`=44.8L`
`ii. pH` of solution `:` Solution will be basic due to the formation of `overset(-)(O)H` ions at cathode.
`1e^(-)=1F=1Eq overset(-)(O)H` ion.
`[overset(-)(O)H]=("Equivalent")/("Volume in L")=(1Eq)/(10L)=10^(-1)N` or `M`
`:. pOH=1implies pH=14-1=13`
`c.`
`i. HCOOK (aq) overset(El ectrolysis)rarrHCOO^(ddot(c-))+K^(o+)`
Since `E^(c-)._(red)` of `H_(2)OgtE^(-)._(red)` of `K^(o+)` ion, so reduction of `H_(2)O` takes place to give `H_(2)O(g)` .
At cathode `:`
`H_(2)O(g)+e^(-)rarr overset(-)(O)H+(1)/(2)H_(2)(g)""(`Reduction `)`
At anode `:` Kolbe's reaction

At anode, the oxidation of `HCOO^(ddo(c-))` takes place to give `1 mol `of `H_(2)O(g)`and `2 mol` of `CO_(2)(g)`.
`1e^(-)=1F=(1)/(2) mol `of `H_(2)=(22.4)/(2)=11.2L` of `H_(2)`
At anode `:`
`2e^(-)=2F=(1 mol `of `H_(2)+2 mol` of `CO_(2))`
`2F=3 mol` of gases
`1F=(3)/(2) mol`of gases
`=(3)/(2) xx 22.4 L `at `STP`
`=33.6 L` at `STP`
Total volume of gases at `STP =11.2 +33.6`
=44.8 L`
`ii. pH` of solution `=13[` PROCEED as in part `(b) (ii)` above `]`
Discussion
4702.

Which kind of isomerism is exhibited by the octahedral complex, [Co(NH_3)_4Br_2]Cl ?

Answer»

GEOMETRICAL and inoization
Geometrical and optical
Optical and ionization
Only geometrical

Answer :A
Discussion
4703.

Which one of the following is amino acids

Answer»

`CH_(3)CONH_(2)`
`CH_(3)CONHCH_(3)`
`CH_(3)NHCO`
`NH_(2)CH_(2).COOH`

Solution :GLYCINE `to NH_(2) -CH_(2)-COOH`
Discussion
4704.

Which of the following graphs represents zero order if AtoP At t=0implies[A]_(0) at t=timplies[A]_(t)

Answer»




SOLUTION :a. `(C_(O)-C_(t))=x=Kxxt,C_(t)=C_(0)-Kxxt` (d) `t_(1/2)=(C_(0))/(2K)`
Discussion
4705.

Which of the following is/are true order (s):

Answer»

`{:(B^(+) lt B lt B^(-) ,Size):}`
`{:(I lt Br lt CIlt F ,"Electron gain enthalpy"):}`
`{:(O lt O^(-) lt O^(+) ,Z_(eff)):}`
`{:(Na lt AI lt Mg lt Si,"Ionisation potential"):}`

Solution :Consider the factors on which these PROPERTIES depend:
(A) Cation is smaller while ANION is bigger than its parent atoms.
(B) Correct order is `CI gt F gt Br gt I`.
(C ) Cation is smaller as it is formed by the loss of electron(s). The anion is formed by the gain of electron(s). The size of anion increases with increase in charge on anion i.e. as the `Z//e` ratio decreases the size increases.
(D) Across the period the size decreases and NUCLEAR size increases. So, ionisation energy increases. However, the first ionisation energy of `Mg` is greater than `AI` because of high penetration power of `2s^(2)` electrons of `Mg` as compared to that of `2p^(1)` electron of `AI`.
Discussion
4706.

The time taken for an electron to complete one revolution in Bohr orbit of hydrogen atom is

Answer»

`(4m^(2)pir^(2))/(n^(2)h^(2))`
`(n^(2)h^(2))/(4mr^(2))`
`(4pi^(2)mr^(2))/(NH)`
`(nh)/(4pi^(2)mr^(2))`

Solution :We KNOW according to Bohr.s theory `mvr=(nh)/(2pi)`
`rArrv=(nh)/(2pimr)`
`therefore` Time required for one complete REVOLUTION,
`T=(2pir)/V=(2pir)/(nh)2pimr=(4pi^(2)mr^(2))/(nh)`
Discussion
4707.

Which among the following are used as catalyst in cracking?

Answer»

OXIDES of AI
OXIDE of Cr, Mo
Oxide of V
All of these

Answer :B
Discussion
4708.

Write the IUPAC names of all the possible isomers with molecular formula C_3H_8O

Answer»

SOLUTION :
Discussion
4709.

Which one does not exist

Answer»

`ClF_(5)`
`BrI_(5)`
`ClBr_(3)`
`ICl`

SOLUTION :`BrI_(3),ClBr_(3)` ( Steric FACTOR & E.N. difference )
Discussion
4710.

The work done by a system is 8 Joule, when 40 joule heat is supplied to it .What is the increase in internal energy of the system?

Answer»

25J
30J
32J
28J

Answer :C
Discussion
4711.

Write the formula of an oxo-anion of manganese (Mn) in which it shows the oxidation state equal to its group number.

Answer»

Solution :`MnO_(2)` PERMANGANATE ion
OXIDATION STATE of Mn is `MnO_(4)^(-)` is +7.
7 is also the group number of Mn in the periodic table.
Discussion
4712.

What is the atomic number of an element of Mn^(2+) ion. Whose electronic structure is [Ar]3d^(8)?

Answer»

27
25
26
28

Answer :D
Discussion
4713.

Which catalyst is used in Ostwald's method ?

Answer»

PT (20 %) + Rh (80 %)
Pt (80 %) + Rh (20 %)
Pt (10 %) + Rh (90 %)
Pt (90 %) + Rh (10 %)

ANSWER :D
Discussion
4714.

Which compound responds to carbylamine best ?

Answer»

p-mehtyl benzylamine
N-mehtyl-O-methylamiline
N-ethyl-N-methyl ethanamine
N, N-dimethyl AMINO benzene

Answer :A
Discussion
4715.

The shape of [Ni(CO)_(4)]is………….. Whereas the shape of [Ni(CN)_(4))]^(2-) is……… .

Answer»


ANSWER :TETRAHEDRAL,SQUARE PLANAR
Discussion
4716.

What kind of phenomenon is corrosion ?

Answer»

SOLUTION :ELECTROCHEMICAL
Discussion
4717.

Which of the following is cathodic reaction?

Answer»

`Fe^(2+) rarr Fe^(3+)`
`4OH^(-) rarr 2H_(2)O + O_(2)`
`2H_(2)O rarr 2OH^(+) + H_(2)`
`2SO_(4)^(2-) rarr S_(2)O_(6)^(2-)`

Answer :C
Discussion
4718.

What is the action of acidified potassium dichromate on : (a ) SO_(2) (b )KI Draw structure of dichromate ion .

Answer»

Solution :(a) Action of acidified potassium dichromate on `SO_(2)`: Wehen passed through acidfied potassium dichromate solution , sulphur OXIDE gas is oxidized to sulphuric acid . The COLOUR of the solution turns orange to green because potassium dichromate is reduced to chlorine sulphate .
`{:(3SO_(2)(g),+,K_(2)Cr_(2)O_(7)(aq),+,H_(2)SO_(4)(aq),to),("Sulphur",,"Potassium",,"Sulphuric",),("dioxide",,"dichromate",,"acid",):}`
`{:(K_(2)SO_(4)(aq),+,Cr_(2)(SO_(4))_(3)(aq),+,H_(2)O(I)),("Potassium",,"Chromic",,"Water"),("sulphate",,"sulphate",,):}`
(b) Action of acidified potassium dichromate on KI : When potassium iodide is treated with potassium dichromate it is oxidised to iodine . The colour of this solution changes to brown due to the liberation of Iodine gas . ,
` {:(K_(2)Cr_(2)O_(7),+,6KL,+,7H_(2)SO_(4),to),("Potassium",,"Potassium",,"Sulphuric",),("dichromate",,"Iodine",,"acid",):}`
` {:(4K_(2)SO_(4),+,Cr_(2)(SO_(4))_(3),+,7H_(2)O,+,3I_(2)),("Potassium",,"Chronic",,"Water",,"Iodine"),("sulphate",,"sulphate",,,,):}`
The structure of dichromate ION is :

Discussion
4719.

The role of fluorspar, which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite is

Answer»

as a catalyst
to MAKE fused MIXTURE conducting
to LOWER the melting temperature of the mixture
to decrease the rate of oxidation of carbon at anode

Answer :B::C
Discussion
4720.

Which of the following are S_(N)2 reactions-

Answer»




ANSWER :A::C
Discussion
4721.

What is Urotropine? How is it prepared? Mention its structure and uses.

Answer»

Solution :
(i) Urotropine is HEXAMETHYLENE tetramine.
(ii) FORMALDEHYDE reacts with ammonia to form hexamethylene tetramine, which is called Urotropine.
`undersets("formal dehyde")(6HCHO ) + 4NH_3 to underset("hexamethylene tetramine")((CH_2)_6N_4 +6H_2O)`
Uses:
(i) Urotropine is used as a medicine to treat URINARY infection.
(ii) Nitration of Urotropine under controlled condition gives an explosive RDX (Research and development explosive). It is also called cyclonite or cyclotri METHYLENE trinitramine.
Discussion
4722.

When an allele fails to express itself in presence of the other allele, the former is said to be -----

Answer»

`H_2SO_4` is STRONGER than HCI
`H_2SO_4`is weaker than HCI
`H_2SO_4` and HCl both have the same strength
The data are not SUFFICIENT to COMPARE the strength of `H_2SO_4` and HCI

Answer :A
Discussion
4723.

Which of the following cannot reduce Tollen's reagent?

Answer»

HCOOH
HCHO
`CH_(3)CHO`
`CH_(3)COCH_(3)`

ANSWER :D
Discussion
4724.

Which of the following can be prepared only by electrolysis

Answer»

`Cl_(2)`<BR>`Br_(2)`
`F_(2)`
`I_(2)`

ANSWER :C
Discussion
4725.

When silver chloride is treated with aqueous ammonia, the complex obtained is

Answer»

`[AG(NH_3)_4]^OPLUS`
`[Ag(NH_3)_6]^oplus`
`[Ag(NH_3)_2]^oplus`
`[Ag(NH_3)(H_2O]^oplus`

Answer :C
Discussion
4726.

Which one of the following is an oxide ore ?

Answer»

MALACHITE
Copper glance
HEMATITE
Zice blende.

Answer :C
Discussion
4727.

Which one of the following compound is capcabel of existing in a meso form

Answer»

3,3-dibromopentane
4-bromo-2-pentanol
3-bromo-pentanol
2,4-dibromopentane

Solution :2, 4-dibromopentane CONTAINS TWO similar ASYMMETRIC carbon atoms and any compound with two or more asymmetric carbon atoms but also having a PLANE of symmetry is called meso-compound.
Discussion
4728.

Which halogen does not show bleaching property:

Answer»

`F_2`
`Cl_2`
`Br_2`
`I_2`

ANSWER :D
Discussion
4729.

Which of the following statements is/are true for the solutions of alkali metals and alkaline earth metals in ammonia (l) ?

Answer»

Concentrated solutions of alkali metals in ammonia are copper bronzed COLOURED and have a metallic lusture
Dilute solutions of alkaline earth metals are deep blue-black in colour due to the spectrum from the solvated electron
Concentrated solutions of the alkaline earth metals in ammonia are bronze coloured
Evaporation of the ammonia from solutions of alkali metals YIELDS the METAL , but with alkaline earth metals evaporation of ammonia gives hexammoniaes of the metals.

Solution :(A)Due to the formation of metal ION clusters
(B)`M+(x+y)NH_3toM^(+)(NH_3)_x + e^(-)(NH_3)_y`
(C ) due to the formation of metal clusters.
(D)`M(NH_3)_6 to` true STATEMENT
Discussion
4730.

Which of the following statements is true for proteins ?

Answer»

They ACT as ANTIBODIES
They act as hormones.
They CATALYSE the BIOCHEMICAL reactions.
all of these

Answer :D
Discussion
4731.

The value of n in the molecular formula Be_(n)Al_(2)Si_(6)O_(18) is:

Answer»

1
2
3
4

Answer :C
Discussion
4732.

Which of the following statements regarding copper salts are true?

Answer»

thecolourof anhydrous `CuSO_(4)` is BLUE
"splitting of silver" can be prevented bycovering the surface of MOLTEN silver with charcoal
Iodine liberated in areaction can ber estimated by titration against a standard thiosulphate solution
Lanthanium is first electron of thirdtransition series

Answer :A::B::D
Discussion
4733.

Which of the following , glycol is an important constituent ?

Answer»

DACRON
NYLON 6
teflon
Viscose RAYON .

Solution :Dacron is a polymer of ETHYLENE glycoland dimethyl terephthalate
Discussion
4734.

The value of enthalpy change (DeltaH) for the reaction C_(2)H_(5)OH(l)+3O_(2)(g)to2CO_(2)(g)+3H_(2)O(l), at 27^(@)C is -1366.5" kJ "mol^(-1). The value of internal energy change for the above reaction at this temperature will be

Answer»

`-1371.5kJ`
`-1369.0kJ`
`-1364.5kJ`
`-1361.5kJ`

Solution :`DeltaH=DeltaE+Deltan_(g)RT`
where, `Deltan_(g)=`NUMBER of moles of gaseous products-no. of moles of gaseous reactants
=2-3=-1
`implies -1365.5=DeltaE-1xx8.314xx10^(-3)xx300`
`DeltaE=-1364.0" KJ "mol^(-1)`
Discussion
4735.

Which substance do not allow to increase the pH higher than neutral value in stomach ?

Answer»

METAL HYDROXIDE
Metal carbonate
Metal sulphide
Metal OXIDE 

SOLUTION :Metal hydroxide
Discussion
4736.

Which one is a homopolymer?

Answer»

 BAKELITE
 Nylon-6,6
 TERYLENE
NEOPRENE

ANSWER :D
Discussion
4737.

What is Aldol condensation ?

Answer»

Solution :Aldehydes and ketones having at least one hydrogen at `PROP`-carbon undergo CONDENSATION reaction in PRESENCE of dilute `N_aOH,Na_2CO_3 or Ca(OH)_2` giving aldol.
Discussion
4738.

Which element among inert gases has maximum number of compounds ? Write the formula of one of the compounds formed by the element.

Answer»

Solution :Xenon (Xe) forms MAXIMUM number of compounds. For example, `XeF_(2)` (xenon DIFLUORIDE) or `XeO_(3)` (xenon trioxide).
Discussion
4739.

Which compound in each of the following pairs will react faster in S_(N)2 reaction with OH^(-)? 2. (CH_3)_(3)C Cl or CH_(3)Cl.

Answer»

Solution :`S_(N)2` reactivity of alkyl HALIDES increases as the hindrance AROUND the `alpha`-CARBON (i.e., the carbon undergoing NUCLEOPHILIC attack) decreases and ALSO the +ve polarsation of the `alpha`-carbon increases. Both these factors are favourable for `CH_(3)Cl` and hence, it reacts faster in `S_(N)2` reaction with `OH^(Theta)`.
Discussion
4740.

What are tetrahedral and octahedral voids in a close-packed structure of particles? How many voids are there in a ccp structure of 'N' atoms? Why is the number of octahedral voids in an hcp or a ccp arrangement of particles equal to the number of packed particles?

Answer»

Solution :In a CCP structures of N ATOMS, there are 2N number of tetrahedral VOIDS and N number of octahedral voids. Thus, TOTAL number of voids present in that ccp structure is (2N + N) = 3N.
Discussion
4741.

Which one of the following has no unpaired electrons ?

Answer»

`O_(2)`
`O_(2)^(-)`
`O_(2)^(+)`
`O_(2)^(2-)`

ANSWER :D
Discussion
4742.

Use/application of catalyst……..

Answer»

For Gibb.s ENERGY REACTION
For reaction enthalpy
For increase/decrease of ACTIVATION energy of reaction
It is EQUILIBRIUM constant

Answer :C
Discussion
4743.

Whichofthe followingstatements,abouttheadvantage ofroastingofsulphideorebeforereductionisnottrue ?

Answer»

ROASTING ofthesulphideto the OXIDE isthermodynamicallyfeasible.
Carbonand hydrogenare suitablereducingagentsformetalsulphides.
The` Delta_ FG ^(@) `ofthesulphideisgreaterthen thosefor` CS_ 2andH_2S `
The` Delta_fG^(@) `isnegativeforroastingofsulphideoretooxide.

Answer :B
Discussion
4744.

Write the I.U.P.A.C. name of the [Co(NH_3)_3Cl_2(NO_2)].

Answer»

triamminedichloridonitrito-N-cobalt(III)
dichlorotriamminenitrito-N-cobalt(III)
dichlorotriamminenitrito-N-cobalt(II)
NONE of these

Answer :A
Discussion
4745.

Write the structure of 3 - oxopentanal.

Answer»

SOLUTION :`CH_(3)-CH_(2)-UNDERSET(O)underset(||)C-CH_(2)-CHO`
Discussion
4746.

Write IUPAC name of the following. CH_3NH_2

Answer»

SOLUTION :Aminomethane
Discussion
4747.

Which is most soluble in water

Answer»

OXALIC acid
Ethyl chloride
Ethyl bromide
n-Hexane

Answer :A
Discussion
4748.

Under which one of the following conditions. Does the reaction.

Answer»

`NH_(4)OH//80^(@)C`
`Conc.H_(2)SO_(4)//160^(@)C`
`"anhydrous"ZnCl_(2)//150^(@)C`
`"dilute" HCl, THF, 80^(@)C`

Solution :N/A
Discussion
4749.

What is the order of polarity of the following bond? (i) C-H (ii) F-H (iii) Br -H (iv) Na-I (v) K-F (vi) Li-Cl

Answer»

`Li-ClgtK-FgtF-HgtBr-HgtC-HgtNa-I`
`K-FgtLi-ClgtF-HgtBr-HgtNaIgtC-H`
`K-FgtF-HgtLiClgtBr-HgtNa-IgtC-H`
`K-FgtLi-ClgtF-HgtNa-IgtBr-HgtC-H`

Solution :Higher the VALUE of ELECTRONEGATIVITY difference, higher will be the POLAR nature of the compound.
Discussion
4750.

What is freon ?

Answer»

SOLUTION :DICHLORODIFLUOROMETHANE `(CF_2Cl_2)`.
Discussion