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7751.

When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N the solution turns light blue.Addition of aqueous NaCl to the blue solution gives a white precipitate O.Addition of aqueous NH_(3) dissolves O and gives an intense blue solution. The metal rod M is :

Answer»

`Fe`
`Cu`
`Ni`
`Co`

Solution :`Cu(M)+AgNO_(3)(N)`(queous colourless solution) `to` Resultant solution contains `Cu(NO_(3))_(2)` (blue solution) and `AgNO_(3)` (colourless solution)
Note: Here it is considered that COMPLETE `AgNO_(3)` is not utilized in the reaction.
`AgNO_(3)(aq)+NACL(aq) to AgCl DARR`(white) `(O)+NaNO_(3)`
Solution containing white ppt. of `AgCl` also contains `Cu(NO_(3))_(2)` which DEVELOPED deep blue colouration with aqueous `NH_(3)` solution
`AgCl darr ("white")+2NH_(3)(aq.) to [Ag(NH_(3))_(2)]^(+)`
`Cu(NO_(3))_(2)(aq.)+4NH_(3) (aq.) to [Cu(NH_(3))_(4)](NO_(3))_(2)` (deep blue solution)
So, Metal rod `M` is `Cu`.
The compound `N` is `AgNO_(3)` and the final solution contains `[Ag(NH_(3))_(2)]^(+)` and `[Cu(NH_(3))_(4)]^(2+)`
Discussion
7752.

The tendencies of the electrodes made up of Cu, Zn and Ag to release electrons when dipped in their respective salt solutions decrease in the order

Answer»

ZngtAggtCu
CugtZngtAg
ZngtCugtAg
AggtCugtZn

Solution :In electrochemical series element are PLACED in order of their decreasing tendency to lose electrons. FIRST ZN COMES, then comes Cu and then comes Ag.
ZngtCugtAg
Discussion
7753.

Write the structures of the following organic halogen compounds: (i) 2-chloro-3-methylpentane.

Answer»

SOLUTION :`overset(1)(C)H_(3)-underset(Cl)underset(|)overset(2)(C)H-underset(CH_3)underset(|)overset(3)(C)H-overset(4)(C)H_(2)-overset(5)(C)H_(3)`
Discussion
7754.

What is the correct relationship between pHs of isomolar solutions of sodiumsoxide pH_(1)sodium suphide pH_(2)sodium selenide pH_(3) and sodium telluride pH_(4)

Answer»

`pH_(1)gtpH_(2)gtpH_(3)gtpH_(4)`
`pH_(1)gtpH_(2)=pH_(3)gtp_(4)`
`pH_(1)ltpH_(2)ltpH_(3)ltpH_(4)`
`pH_(1)ltpH_(2)ltpH_(3)=pH_(4)`

ANSWER :A
Discussion
7755.

Which of the following is not a nitro-derivative

Answer»

`C_(6)H_(5)NO_(2)`
`CH_(3)CH_(2)ONO`

`C_(6)H_(4)(OH)NO_(2)`

SOLUTION :`CH_(3)CH_(2)-O-N=O` is a nitrite derivative, hence it is not a nitro derivative.
Discussion
7756.

Which of the following compound is both hygroscopic and explosive

Answer»

`XeF_2`
`XeO_4`
`XeO_3`
`XeF_6`

ANSWER :C
Discussion
7757.

Which is hydrated to a maximum extent ?

Answer»

`CH_3-underset(CH_3)underset|oversetoverset(CH_3)|C-CH=CH_2`
`CH_3CH=CH_2`
`CH_2=CH_2`
`CH-=CH`

ANSWER :A
Discussion
7758.

Which of the following practices involve green chemistry ?(i) Substitute CFCs by environmental friendly HFCs and other compounds (ii) Replace halogenatedsolvent by liquid CO_(2) for drycleaning , (iii) Use of H_(2)O_(2) for bleaching instead of Cl_(2) (iv) Use of tamarind seeds to clean municipal and industrial waste water.

Answer»

(i) and (II)
(ii) and (IV)
(III) and (iv)
(i),(ii) NAD (iii)

ANSWER :D
Discussion
7759.

What is a biodegradable polymer ? Give an example of a biodegradable aliphatic polyster.

Answer»

Solution :Polymers which disintegrate by themselves over a period of time DUE to ENVIRONMENT degradution by bacteria etc. are called biodegradable polymers. An example of biodegradable aliphatic POLYESTER is PHB , i.e., Poly-`beta`-hydroxybutyrate -co-`beta`-hydroxyvalerate.
`UNDERSET(3-"Hydroxybutanoic acid")(n HO -underset(CH_3)underset(|)(CH)-CH_(2)-COOH)+nHO-underset(CH_2CH_3)underset(|)(CH)-CH_(2)-COOHoverset("Polymerization")to`
Discussion
7760.

Which on ozonolysis form a mixture of two ketones -

Answer»

`(CH_3)_3C=C(C_2H_5)_2`
`(CH_3)_2CHCH=C(CH_3)_2`

`CH_3CH_2overset(CH_3)OVERSET(|)C=C(CH_3)_2`

ANSWER :A::C::D
Discussion
7761.

Which amongst following is called spin paired complex ?

Answer»

`[Co(NH_(3))_(6)]^(3+)`
`[CoF_(6)]^(3-)`
`[NiCl_(4)]^(2-)`
All complexes with STRONG field ligands

Solution :`[Co(NH_(3))_(6)]^(3+) implies d^(6), t_(2G)^(2,2,2), eg^(0,0`
Discussion
7762.

The trialkylborate on reaction with sodiumhydride in tetrahydrofuran to form………….. .

Answer»

`NaBH_(4)`
`NA[BH(OR)_(3)]`
`Na[B(OR)_(3)]`
`Na[BH(OR)_(3)]^(-)`

ANSWER :B
Discussion
7763.

Which of the following combinations will produce ethyl isothiocyanate ?

Answer»

`C_(2)H_(5)NH_(2)+S_(8) OVERSET(HgCl_(2))(rarr)`
`C_(2)H_(5)CN+S_(8) rarr`
`C_(2)H_(5)NC+S_(8) rarr`
`C_(2)H_(5)NO_(2)+S_(8) rarr`

Solution :`C_(2)H_(5)NC+1/8 S_(8) rarr underset("Ethyl ISOTHIOCYANATE")(C_(2)H_(5)-N=C=S)`
Discussion
7764.

Under what condition does each protein take a shape that is energetically most stable ?

Answer»

Solution :It takes energetically most stable SHAPE in NORMAL physiological STATE.
Discussion
7765.

Which will dehydrate easily

Answer»

3-methyl-2-butanol
Ethyl alcohol
2-methyl propane-2-ol
2-methyl butanol-2

Answer :D
Discussion
7766.

The species having pyramidal shape is

Answer»

`SO_(3)`
`BrF_(5)`
`SiO_(3)^(2-)`
`OSF_(2)`

SOLUTION :`SO_(3)` (PLANAR), `BrF_(5)` (T-shaped) and `SiO_(3)^(2-)` (planar). However, `OSF_(2)` like `OSCl_(2)` is pyramidal.
Discussion
7767.

The metal which cannot be extracted by smelting process?

Answer»

Pb
Fe
Zn
Al

Answer :C
Discussion
7768.

Vit-B_2 is also known as

Answer»

Tocopherols
Retinol
riboflavin
pyridoxine

Answer :C
Discussion
7769.

Which one of the following is used for treatment of syphilis ?

Answer»

IPRONIAZID
SALVARSAN
CHLORAMPHENICOL
Terpincol

Answer :B
Discussion
7770.

Write the structures and names of all the stereoisomers of the following compounds: [Pt(NH_(3))_(2)Cl_(2)]

Answer»

SOLUTION : `[PT(NH_(3))_(2)Cl_(2)]`

Diamminedichloridoplatinum(II)
Discussion
7771.

Which of the following statements are not true about the following decomposition reaction? 2KCIO_3to2KCI +3O_2

Answer»

POTASSIUM is undergoing OXIDATION.
Chlorine is undergoing oxidation.
Oxygen is reduced
None of the SPECIES are undergoing oxidation or reduction.

SOLUTION :
Discussion
7772.

You are provided with samples of some impure metals such as titanium and nickel. Which method would you recommend for the purification of each of these metals?

Answer»


Answer :TITANIUM is PURIFIED by van-Arkel method. Nickel is purified by Mond PROCESS.
Discussion
7773.

Which of the following compounds is not a Lewis acids?

Answer»

`BF_(3)`
`SnCl_(4)`
`R-OR`
`P-MgX`

Answer :C
Discussion
7774.

Which one of the following forms of iron is called Mallaeable iron?

Answer»

WROUGHT iron
Cast iron
Pig iron
Spiegel

Answer :1
Discussion
7775.

Which has the maximum ksp value ?

Answer»

KOH
RbOH
LiOH
NaOH

Answer :B
Discussion
7776.

Which of the following statement regarding ozone is not correct?

Answer»

The ozone molecule is ANGULAR in shape.
The ozone is resonance hybrid of two structures.
The oxygen-oxygen BOND length in ozone is identical with that of molecular oxygen.
Ozone is used as a GERMICIDE and DISINFECTANT for the purification of air.

Solution : The bond length is INTERMEDIATE between that for a single bond `(1.48Å" as in "H_2O_2)` and for a double bond `(1.21 Å" as in "O_2).`
Discussion
7777.

Which metal in the first transition series exhibits +1 oxidation state most frequently and why ?

Answer»

Solution :Cu has the ELECTRONIC configuratio `3d^(10)4s^(1)`. It can EASILY LOSE `4s^(1)` ELECTRON to give the stable `3d^(10) ` configuration . Hence, it SHOWS `+1` oxidation state. We write it as Cu(I).
Discussion
7778.

Which of the following will not act as antacid ?

Answer»

SODIUM hydrogencarbonate
MAGNESIUM hydroxide
Sodium CARBONATE
ALUMINIUM carbonate

Answer :C
Discussion
7779.

Which of the following alkenes shown below has the Z-configuration of its double bond?

Answer»




ANSWER :C
Discussion
7780.

When silver chloride is dissolved in a large excess of ammonia, practically all silver ion can be assumed to exist in form of a sigle ionic species [Ag_(x)[NH_(3))_(y)]^(x+). Computerthe values of x and y using the following two cells. (a) Ag|0.4 xx 10^(-3)M AgCl, 1M NH_(3)||40 xx 10^(-3), MAgCl, 1M NH_(3)|Ag E_(cell) = 0.1185 V at 298 K (b) Ag|3 xx 10^(-3)M AgCl, 1M NH_(3)||3.0 xx 10^(-3)M, AgCl, 0.001 M NH_(3)|Ag E_(cell) = 0.1263 V at 298 K.

Answer»


ANSWER :`X = 1, y = 2 ;`
Discussion
7781.

Which of the following statements is/are false ?

Answer»

In `[PtCl_(2)(NH_(3))_(4)]^(2+)` complex ion, the cis-form is OPTICALLY active, while trans-form is optically inactive
In `[Fe(C_(2)O_(4))_(3)]^(3-)`, geometrical isomerism does not EXIST while optical isomerism exists
`[Mabcd]^(n+-)` square planar complexes exhibit both optical as well as geometrical isomerism
In `[Mabcd]^(n+-)` tetrahedral complexes, optical isomerism cannot be observed

Solution :(a) cis and trans form are optically inactive.
Discussion
7782.

We observe blue colour if :

Answer»

Cu electrode is PLACED in the `AgNO_(3)` solution
Cu electrode is placed in the `ZnSO_(4)` solution
Cu electrode is placed in the DIL. `HNO_(3)`
Cu electrode is placed in dil. `H_(2)SO_(4)`

Answer :A::C
Discussion
7783.

The reagent can be converted to benzaldehyde by

Answer»

`SnCl_(2)+HCl`
`H_(2)//Ni`
`Na//"Alcohol"`
`CrO_(2)Cl_(2)`

Answer :D
Discussion
7784.

Which of the following oxides of nitrogen will be the most stable one ?

Answer»

`2NO_2(G)HARR N_2(g) + 2O_2(g) , K = 6.7 xx 10^(16) MOL. 1^(-1)`
`2NO(g) hArr N_2(g)+ O_2(g) , K= 2.2 xx 10^30 mol.1^(-1)`
`2N_2O_5(g) hArr 2N_2(g) + 5O_2(g), K = 1.2 xx 10^(34) mol.l^(-1)`
`2N_2O (g)hArr 2N_2(g)+ O_2(g), K =3.5 xx 10^33 mol.l^(-1)`

Answer :A
Discussion
7785.

What is the magnetic moment of K_(3)[FeF_(6)] ?

Answer»

3.87 BM
4.98 BM
5.91 BM
6.92 BM

Solution :`[FeF_(6)]^(3-) implies d^(5)` (HIGH SPIN)
Discussion
7786.

The "spin-only" magnetic moment [in units of Bohr magneton, (mu_(B))] of Ni^(2+) in aqueous solution would be (At. NO. Ni=28)

Answer»

6
1.73
2.84
4.9

Solution :The number of UNPAIRED electrons in `Ni^(2+)(aq)=2` Water is weak LIGAND hence no pairing will take place spin magnetic moment
`=sqrt(N(n+2))=sqrt(2(2+2))=sqrt(8)=2.82`
Discussion
7787.

Which among the following pairs of elements is 'not' an example of chemical twins ?

Answer»

Zr and Hf
Nb and Ta
Mo and W
Ta and Re

Solution :a PAIR of elements having similar properties due to similar atomic radii are called chemical twins and they are elements of 4d and 5d - series because they have large DIFFERENCE in their atomic radii while all other elements have almost similar atomic radii.
Zr (145 Pm) and Hf (144Pm)
Nb (134 Pm) and Ta(134 Pm)
Mo (129 Pm) and W (130 Pm)
Ta (134 Pm) ad Re (114 Pm).
Discussion
7788.

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

Answer»

Solution :
The common example of MULTIMOLECULAR colloid is sulphur sol which consists of particles of `S_8`molecules. The common example of macromolecule is starch. The associated colloids are substances which behave as normal electrolytes at low concentrations but behave as colloidal particles at higher concentration. For example, soaps and DETERGENTS. They differ from multimolecular and MACROMOLECULAR colloids in the sense that they behave as normal electrolytes at low concentrations but EXHIBIT colloidal STATE properties at higher concentrations due to the formation of aggregated particles called micelles.
Discussion
7789.

Which of the following is the correct order of decreasing S_N22 reactivity' ? (X=a halogen)

Answer»

` RCH_2 X GT R_2 CHX gt R_3 CX`
` R_3 CX gt R_2 CHX gt RCH_2 X `
` R_2 CHX gt R_3 CX gt RCH_2X `
` RCH_2 X gt R_3 CX gt R_2 CHX`

ANSWER :A
Discussion
7790.

Write the IUPAC name of the given compound :

Answer»


ANSWER :The IUPAC NAME is N, N-Dimethylbutanamide.
Discussion
7791.

Write the IUPAC name of the given compound :

Answer»

SOLUTION :
Discussion
7792.

Which one of the following formula represents a first order reaction?

Answer»

`K = x/t`
`K = 1/(2T)[1/((a-x)^2)-1/a^2]`
`K = 2.303 t log""a/((a_0-x))`
`K = 1/t xx x/(a(a-x))`

Answer :C
Discussion
7793.

The use of ""^(12)Cscale has superseded the older scale of atomic mass based on ""^(16)O isotope, one important advantage of the former being

Answer»

the ATOMIC masses on `""^(12) C`scale became whole numbers
`""^(12)C`is more abundant in the earth's crust than `""^(16)O`
the difference between the physical and chemical atomic masses got narrowed down significantly
`""^(12)C`is SITUATED midway between METALS and non-metals in the PERIODIC table.

Solution :Physical atomic WEIGHTS are obtained by taking mass of 0-16 isotope as 16.00000. Chemical atomic weights are obtained by taking the average mass of the natural mixture of oxygen isotopes as 16.00000. Knowing the percentage (0-16,0-17, 0-18), the true mass is actually found to be 16.00447. Taking C-12 as the reference, the difference between two narrowed down.
Discussion
7794.

Which one of the following ores is best concentrated by froth flotation method:

Answer»

Galena
Malachite
MAGNETITE
Siderite

SOLUTION :frothfloatation methodismainlyapplicableforsulphideores
(1)malachiteore `Cu(OH)_2 . CucO_3`
(2) magneticore : ` Fe_3 O_4`
(3) sideriteore : `FeCO_3`
(4) Galena ore ` : PBS ` (SULPHIDE ore)
Discussion
7795.

Which has highest value of pKa?

Answer»

Phenol
Ethanol
o - Nitrophenol
o - Cresol

Answer :C
Discussion
7796.

Which of the following compounds of xenon cannot be prepared

Answer»

XEF
`XeF_(2)`
`XeF_(4)`
`XeF_(6)`

ANSWER :A
Discussion
7797.

When electricity is passed through a solution of AlCl_(3), 13.5 g of Al is deposited. The number of faradays must be

Answer»

`1.0`
`1.5`
`0.5`
`2.0`

ANSWER :B
Discussion
7798.

Which element does not form stable diatomic molecule ?

Answer»

Oxygen
PHOSPHOROUS
Chlorine
Nitrogen

Solution :Phosphorous can FORM STABLE `P_4` MOLECULE, not `P_2` molecule.
Discussion
7799.

Write two uses of Bakelite ?

Answer»

Solution :It is used for MAKING electric goods, FOUNTAIN pen, PLYWOOD, combs ETC.
Discussion
7800.

Which of the following is incorrect abut Lother Meyer curve.

Answer»

Curve was ploted between atomic volume and atomic MASS.
Peaks of all curves were occupied by alkali metals.
BOTTON is GENERALLY occupied by high melting solids
Ascending PART of cures were occupied by alkaline earth metals.

Solution :Theory BASED
Discussion