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9801.

Which ion forms a hydroxide highly soluble in water ?

Answer»

`Ni^(2+)`
`K^+`
`ZN^(2+)`
`Al^(3+)`

ANSWER :B
Discussion
9802.

Zinc displaces copper from the solution of its salt because

Answer»

ATOMIC number of zinc is more than that of copper
Zinc SALT is more soluble in water tha the copper salt
Gibbs free energy of zinc is LESS than that of copper
Zinc is placed higher than copper in electro-chemical series

Solution :The reduction potential of ZN is very higher than Cu.
Discussion
9803.

To which of the following class of organic compounds does the soap belongs?

Answer»

Esters
Amines
SALTS of ORGANIC acids
Aldehydes

ANSWER :C
Discussion
9804.

When fluroide is heated with conc H_2SO_4 and MnO_2 the gas evolved is:

Answer»

HF
`MnF_2`
`F_2`
None

Answer :D
Discussion
9805.

Which of the following metal is leached by cyanide process?

Answer»

AG 
NA 
AI 
CU 

ANSWER :A
Discussion
9806.

The total number of amino acids in insulin is ……………………

Answer»

51
45
67
39

Answer :A
Discussion
9807.

What is renaturation?

Answer»

SOLUTION :The REVERSAL of denaturation is KNOWN asrenaturation. As a result of denaturation, the PROTEIN undergoes changes physically and CHEMICALLY.
Discussion
9808.

When ether is exposed in air for sometime in explosive substance produced is

Answer»

peroxide
TNT
Oxide
Superoxide

Answer :D
Discussion
9809.

Which one the following compound when heated with KOH and primary amines give carbylamine test :

Answer»

`CHCl_3`
`CH_3Cl`
`CCl_4`
`CH_3NC`

ANSWER :A
Discussion
9810.

Which is not an ore of gold ?

Answer»

Syvanite
Calaverite
Covellite
Bismuth aurite

Answer :C
Discussion
9811.

Which of the following compound reacts with acetic anhydride to produce a compound which is a pain killar and antipyretic?

Answer»

OXALIC acid
Cinnamic acid
Benzoic acid
Salicylic acid

Answer :C
Discussion
9812.

Which oxide of Mn is acidic in nature?

Answer»

MNO
`Mn_2O_7`
`Mn_2O_3`
`MnO_2`

ANSWER :B
Discussion
9813.

Which of the following will give characteristic colour with FeCl_(3)?

Answer»


`CH_(3)COCH_(2)CO_(2)C_(2)H_(5)`

ANSWER :A::B::C
Discussion
9814.

Write the skeleton equation for the followingchemical reaction and balance them by oxidation number method : (i) Chloride ions reduce manganese dioxide to manganese (II) ions in acidic medium and get itself oxidized to chlorine gas . (ii) The nitrate ions in acidic medium oxidize magnesium to Mg^(2+) ions but itself gets reduced to nitrous oxide .

Answer»

Solution :(i) The skeleton EQUATION for the given process is
`MnO_(2) + Cl^(-) to Mn^(2+) + Cl_(2) + H_(2)O`
Step (1) : `overset(+4)Mnoverset(+2)O_(2) + Cl^(-) to Mn^(2+) + overset(0)Cl_(2) + overset(+1)H_(2) overset(-2)O`
Step (2) :

Step (3) : Equalize the increase/decrease in O.N. by multiplying
`MnO_(2) " by 1 and" Cl^(-) " by " 2 `
` MnO_(2) + 2Cl^(-) to Mn^(2+) + Cl_(2) + H_(2)O`
Step (4): Balanceother atoms except H and O. Here they are all balanced .
Step(5) : Balance O atoms by adding `H_(2)O` molecules to the SIDE falling short of O atoms
`MnO_(2) + 2Cl^(-) to Mn^(2+) + Cl_(2) + H_(2)O + H_(2)O`
Step (6) : Balance H atoms by adding `H^(+)` ions to the side falling short of H atoms.
`MnO_(2) + 2Cl^(-) + 4H^(+) to Mn^(2+) + Cl_(2) + 2H_(2)O`
(ii) The skeleton equation for the given process is
`MG + NO_(3)^(-) to Mg^(2+) + Na O + H_(2)O`
Step (1) : `overset(0)Mg + (overset(+5)Noverset(-2)O_(3))^(-) to Mg^(2+) + overset(+1)N_(2) overset(-2)O + overset(+1)H_(2) overset(-2)O `
Multiply `NO_(3)^(-)` by 2 to equalize N atom
Step (2) :

Step (3) : Equalize increase /decrease in O.N. by multiplying Mg by 4 and `2NO_(3)^(-)` by 1 .
`4Mg + 2NO_(3)^(-) to 4Mg^(2+) + N_(2)O + H_(2)O`
Step (4) : Balance atoms other than O and H
`4Mg + 2NO_(3)^(-) to 4Mg^(2+) + N_(2)O + H_(2)O`
Step (5) : Balance O atoms
`4Mg + 2NO_(3)^(-) to 4Mg^(2+) + N_(2)O + H_(2)O + 4H_(2)O`
Step (6) : Balance H atoms as is done in acidic medium
`4Mg + 2NO_(3)^(-) + 10H^(+) to 4Mg^(2+) + N_(2)O + 5H_(2)O`
Discussion
9815.

Which of the following will not show coupling reaction with benzenediazonium chloride?

Answer»

Aniline
Phenol
2-Naphthol
Benzyl alcohol

Solution :Only aromatic `1^(@)` AMINES and phenols SHOW COUPLING REACTION.
Discussion
9816.

Write the structure of the alkene formed by dehydrohalogenation of I-bromo methyl cyclohexane with alcholie KOH

Answer»

SOLUTION :
Discussion
9817.

Write three points of difference between sols and emulsions.

Answer»
Discussion
9818.

Which of the following is most polarised

Answer»

KR
He
AR
Xe

Solution :Xe is highly POLAR SINCE the ionisation potential of xenone is quiteclose to the ionisation potential of oxygen.
Discussion
9819.

The reagent used in the conversion of phenol to 1, 4 -benzo quinone is ………………………. .

Answer»

SOLUTION :ACIDIFIED `K_2Cr_2O_7`
Discussion
9820.

Which alkyl halide has the highest density and why?

Answer»

SOLUTION :`CH_(3)I`, because of its LOWEST carbon CONTENT and heaviest halogen i.e., I.
Discussion
9821.

When a buffer solution of sodium acetate and acetic acid is diluted with water

Answer»

ACETATE ion CONCENTRATION increases
`H^(+)` ion concentration increases
`OH^(-)` ion concentration increases
`H^(+)` ion concentration remain unaltered

Solution :BUFFER solution have CONSTANT pH. When we add the water into this buffer solution. So no effect on it.
Discussion
9822.

What happens when benzoic acid is added to benzene ?

Answer»

Solution :Benzoic ACID MOLECULES diamerise due to HYDROGEN BONDING.
Discussion
9823.

Where among the following metal complexes the one which exhiibits optical activity is: (AA=bidentate ligand, A, X=monodentate ligand)

Answer»

CIS-`[MA_(4)X_(2)]`
TRANS-`[MA_(4)X_(2)]`
cis-`[M(A A)_(2)X_(2)]`
trans-`[M(A A)_(2)X_(2)]`

ANSWER :C
Discussion
9824.

Which compound has identical C-C bond length.

Answer»




Solution :Compound has IDENTICAL C- C bond length due to negative CHARGE PARTICIPATE in reso and molecule GET aromaticity.
Discussion
9825.

Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide ?

Answer»

`Be(OH)_(2)`
`Mg(OH)_(2)`
`Ca(OH)_(2)`
`Ba(OH)_(2)`

Solution :`Be(OH)_(2)` is amphoteric and therefore, is SOLUBLE in NAOH.
Discussion
9826.

Which of the following is an example of ambidentate ligand

Answer»

`CO`
`CN^(-)`
`H_2O`
`SO_4^(2-)`

ANSWER :B
Discussion
9827.

Which is correct order of stability of free Radical?

Answer»




Solution :Stability of free RADICAL ` PROP + M, +H, +Iprop (1)/(-M,-H,-I)`
Discussion
9828.

What happens when aldehyde is reduced ?

Answer»

SOLUTION :PRIMARY ALCOHOL is FORMED.
Discussion
9829.

(X) is very important laboratory reagent which is prepared by its naturally occurring ore which is called pyrolusite. Pyrolusite when fused with alkali in the presence of O_(2), green compound (Y) is produced. (Y) is converted into (X) by electrolysis or by using ozone. Q. Select the correct statements.

Answer»

(X) is TETRAHEDRAL and diamagnetic
(Y) is tetrahedral and paramagnetic
(X) produce dimanganese hepta oxide (ioly liquid) with CONC. `H_(2)SO_(4)`.
all are correct.

Answer :D
Discussion
9830.

What is tincture of iodine? What is its use ?

Answer»

Solution : 2-3% solution of IODINE in ALCOHOL and WATER is called tincture of iodine. It is a powerful antiseptic. It is APPLIED on wounds
Discussion
9831.

(X) is very important laboratory reagent which is prepared by its naturally occurring ore which is called pyrolusite. Pyrolusite when fused with alkali in the presence of O_(2), green compound (Y) is produced. (Y) is converted into (X) by electrolysis or by using ozone. Q. On small scale (X) is prepared by disproportionation of (Y) is acidic solution. which of the following is produced by disproportionation of (Y) in slightly alkaline solution.

Answer»

`KMnO_(4),Mn^(+2)`
`KMnO_(4),MnO_(2)`
`MnO_(2),Mn^(+2)`
`K_(2)MnO_(4),Mn^(+2)`

ANSWER :B
Discussion
9832.

Which compound will not give positive chronyl chloride test:

Answer»

COPPER chloride `CuCl_(2)`
Mercuric chloride, `HgCl_(2)`
Zinc chloride, `ZnCl_(2)`
ANILINIUM chloride, `C_(6)H_(5)NH_(3)^(+)Cl^(-)`

Answer :B
Discussion
9833.

The vapour pressure of a dilute solution of glucose (C_(6)H_(12)O_(6)) is 750 mm Hg at 373K . Calculate (i) molality and (ii) mole fraction of the solute.

Answer»

SOLUTION :MOLE FRACTION of SOLUTE `=(N)/(n+N)
Discussion
9834.

Which of the following reactions is correct?

Answer»

a.
b.
C.
d.

Solution :`ROH` (aliphatic alcohol) on reaction with `(HNO_(3)+H_(2)SO_(4))` gives `R-O-NO_(2)`. So `(a)` is incorrect and `(b)` is correct.
c. `LAH` REDUCES `(-CHO)` group to alcohol without affecting the `(C=C)` bond.
So, the statement `(c )` is WRONG.
d. ETHERS are obtained (Williamson synthesis) when `1^(@) RX` reacts with `3^(@)` alkoxide. In the problem, `3^(@) RX` reacts with `1^(@)` alkoxide. So alkene will be obtained. So, the statement `(d)` is wrong, and consequently the answer is `(b)`.
Discussion
9835.

Zn, Cd, Hg belong to d-block elements even though they do not have partially filled d-orbitals. Give reason.

Answer»

Solution :(i) Zn, Cd, Hg belong to d-block ELEMENTS even though they do not have partially filled d-orbitals EITHER in their elemental state or in their normal oxidation STATES.
(ii) HOWEVER they are treated as transition elements, because their PROPERTIES are an extension of the properties of the respective transition elements.
Discussion
9836.

Which detergent is useful for domestic purpose ?

Answer»

ANIONIC
Cationic
Non anionic
All of the GIVEN 

SOLUTION :Anionic
Discussion
9837.

Which of the following is not a biodegradable polymer ?

Answer»

PHBV
PGA
PMMA
PCL

Answer :C
Discussion
9838.

Which of the following pairs of cations can be separated by using dilute HCl in cold conditions?

Answer»

`AG^(+), Cu^(2+)`
`Ag^(+), Hg_(2)^(2+)`
`Ag^(+), Pb^(2+)`
`Pb^(2+), Hg_(2)^(2+)`

ANSWER :A
Discussion
9839.

Using IUPAC norms, write the systematic names of the following: [Ti(H_(2)O)_(6)]^(3+)

Answer»

SOLUTION :Hexaaquatitanium(III) ION
Discussion
9840.

Which one of the following pairs of substances on reaction will not evolve H_(2) gas ?

Answer»

Iron and `H_(2)SO_(4)` (aq)?
Iron and steam
COPPER and HCl(g)
Sodium and ethyl alcohol

Solution :Copper is LESS reactive THA hydrogen and does not displace hydrogen from HCl.
Discussion
9841.

Which is amphoteric ?

Answer»

`AL(OH)_3`
`B(OH)_3`
`MG(OH)_3`
`NaOH`

ANSWER :A
Discussion
9842.

Which one of the following is not a coordination compound ?

Answer»

`K_(3)[Fe(CN)_(6)]`
`NaFeCl_(4)`
`FeSO_(4). (NH_(4))_(2)SO_(4)`
`Fe(H_(2)O)_(6)Cl_(3)`.

Answer :C
Discussion
9843.

Write the correct IUPAC name of the following compounds. (i)

Answer»


SOLUTION :
Discussion
9844.

What should be added to reduce the intensity of colour in coloured solution ?

Answer»

SALT
`Cl_(2)` gas
CHARCOAL
Powder of FE 

SOLUTION :Charcoal
Discussion
9845.

Write the IUPAC name for the following compouns. (i)K_2 [Fe(CN)_3(Cl)_2( NH_3) ] (ii)[Cr(CN)_2(H_2O) _4][CO(o x)_2(3n) ] (iii)[Cu(NH_3) _3Cl_2] (iv) [Cr(NH_3)_3 (NC)_2(H_2O)]^(+) (v)[Fe(CN)_6]^(4-)

Answer»

Solution :Potassium monoamminedichlorotricuano ferrate (III)
(ii). Tetraaquadicyanido CHROMIUM (II) mono (ethylene DIAMINE ) dioxalato cobaltate (IV)
(iii) diammine DICHLORO COPPER (II)
(iv) Trimmine monoqua di isocyanido KN-chrommium (III) ion.
(V) Hexacyano Ferrate (II) ion.
Discussion
9846.

Write the structure for the following oxoacids of phosphorus. (i) Hypophosphorousacid (ii) Orthophosphorous acid (iii) Orthophosphoric acid (iv) Pyrophosphoric acid

Answer»

SOLUTION :
Discussion
9847.

Which series of elements would have nearly the same atomic radii ?

Answer»

Fe, CO, Ni
Na, K, RB
F, CL, Br
Li, Be, B

Answer :A
Discussion
9848.

Write the hydrolysed product of : (i) Maltose(ii) Cellulose

Answer»

SOLUTION :(i) `ALPHA`-D-glucose(II) `BETA`-D-glucose
Discussion
9849.

What product is formed by mixing the solution of K_(4)[Fe(CN)_(6)] with the solution of FeCl_(3)

Answer»

Ferro-ferricyanide
Ferri-ferrocyanide
Ferri-ferricyanide
None of these

Solution :`Fe^(3+)+K_(4)[Fe(CN)_(6)]toKunderset("PRUSSIAN BLUE")([Fe[Fe(CN)_(6)]])+3K^(+)`
Discussion
9850.

Washing soap can be prepared by saponification with alkali of which of the following oil

Answer»

Rose oil
PARAFFIN oil
Groundnut oil
Keroseneoil

Solution : Any OILS which are good for eating or cooking, can be used in making SOAP. One of the best is said to be COCONUT oil Groundnut, Shea butter, Cocoa butter, Sun flower and many other vegetable oils are ALSO used.
Discussion