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11401.

When a small amount of HCl is added to an aqueous solution of BiCl_(3), a white precipitate is formed. This is due to

Answer»

`Bi(OH)_(3)`
`Bi_2O_3`
`BiOCl`
none of the above

Solution :`BiCl_3`, being the salt of a strong acid and weak base, undergoes partial hydrolysis under WEAKLY acidic conditions to give a WHITE precipitate of BIOCI, which dissolves in the EXCESS of the acid.
`BiOCI_(3)+3HOH to underset("ppt".)(BiOCl)+2HCl`
`BiOCl+2HCl to BiCl_(3)+H_(2)O`
BiOCl is used as a white pigment under the NAME pearl white.
Discussion
11402.

Which halogen reacts with KHSO_(4) to form potassium per di sulphate

Answer»

Cl
Br
I
F

Solution :`2KHsO_(4)+F_(2)t o K_(2) S_(2) O_(8)+2HF`
Discussion
11403.

What are tranquilisers ? Give an example.

Answer»

Solution :Tranquilisers are NEUROLOGICALLY ACTIVE DRUGS. They affect the message TRANSFER mechanism from nerve to receptor. Noradrenaline is an example of tranquilisers.
Discussion
11404.

Write the electronic configuration of Ce^(4+) and Co^(2+),

Answer»

Solution :`Ce (Z = 58) toCe^(4+) 4e^(-)`
`Ce^(4+)- 1s^(2)2S^(2)2P^(6)3s^(2)3p^(6)4s^(2)3d^(10)4p^(6)5s^(2)4d^(10)5p^(6)`
`Co^(2+)- 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(5)`
Discussion
11405.

Which of the following shows maximum molar conductance ?

Answer»

`[CO(NH_(3))_(6)]Cl_(3)`
`[Co(NH_(3))_(3)Cl_(3)]`
`[Co(NH_(3))_(4)Cl_(2)]Cl`
`[Co(NH_(3))_(5)Cl]Cl_(2)`

Solution :N//A
Discussion
11406.

Which of the following statements is true in aqueous medium?

Answer»

`CH_(2)CH_(2)S^(-)` is a stronger base and more nucleophilic than `CH_(3)CH_(2)O^(-)`
`CH_(3)CH_(2)S` is a stronger base but is LESS nucleophilic than `CH_(3)CH_(2)O^(-)`
`CH_(3)CH_(2)S^(-)` is a weaker base but is more nucleophilic than `CH_(3)CH_(2)O^(-)`
`CH_(3)CH_(2)S^(-)` is a weaker base and less nucleophilic than `CH_(3)CH_(2)O^(-)`

Solution :In PROTIC solvent `CH_(3)CH_(2)S^(-)` is more nucleophilic than
`CH_(3)CH_(2)O`:
Discussion
11407.

Which of thefollowing combination of orbitals do / does not form bond (if x-axis is internuclear axis) ?

Answer»

`s+p_(Z)`
`s+s`
`p_(z)+p_(x)`
`d_(XY)+p_(y)`

SOLUTION :`s+p_(z) : " Non-bonding" "" s+s: SIGMA- "bond" "" p_(z)+p+_(x) : "Non-bonding" "" d_(x)+p_(y) : PI ` bond
Discussion
11408.

Which of the following molecules contain asymmetric carbon atom ?

Answer»

`CH_3CHClCOOH`
`CH_3CH_2COOH`
`ClCH_2. CH_2COOH`
`Cl_2CHCOOH`

ANSWER :A
Discussion
11409.

The vapour of a hydrocarbon is 2.47 times heavier than that of oxygen. What is its molecular weight ?

Answer»


ANSWER :79.04
Discussion
11410.

Transition metal ions are generally coloured. Why?

Answer»

Solution :COLOUR of transition METAL ions is DUE to d`d ELECTRONIC transition.
Discussion
11411.

Toluene reacts with Cl_(2) in presence of light to give

Answer»

BENZYL chloride
p-chlorotoluene
Benzoyl chloride
o-chlorotoluene

Answer :A
Discussion
11412.

What is the basicity of H_3PO_4?

Answer»

SOLUTION :`H_3PO_4`CONTAINS three P-OH bonds and THEREFORE, its basicity is three.
Discussion
11413.

Which are insecticides ?

Answer»

Baygon
Saline
Methoxy chlor
All of these

Answer :D
Discussion
11414.

When nitrobenzene is treated with Br_(2) is presence of FeBr_(3), the major product formed is m- bromonitrobenzene. Find the statements which are related to obtain the m-isomer.

Answer»

The electron DENSITY on meta CARBON is more than that on ortho and para positions.
The intermediate carbonium ion FORMED after initial ATTACK of `Br^(+)` at the meta position is least destablized.
Loss of aromaticity when `Br^(+)` attacks at the ortho and para positions and not at meta position
Easier loss of `H^(+)` to regain aromaticity from the meta position than from ortho and para positions.

Answer :A
Discussion
11415.

The volume of water to be added to 200 mL of seminormal HCl solution to make it decinormal is

Answer»

200 mL
400 mL
600 mL
800 mL

Answer :d
Discussion
11416.

Which is best reagent to accomplish the following conversion ? CH_(3)CH_(2)Br overset((?))rarr CH_(3)CH_(3)

Answer»

conc. `H_(2)SO_(4)`<BR>Na
conc. HCl
Mg, then `H_(2)O`

SOLUTION :`underset(""CH_(3)CH_(3)+Mg(OH)Br) underset(""darrH_(2)O)(CH_(3)CH_(2)Br+Mg rarrCH_(3)CH_(2)MGBR)`
Discussion
11417.

Write the formula of the compound of phosphorus which is obtained when conc. HNO_(3) oxidises P_(4).

Answer»

SOLUTION :`{:(""2HNO_(3) RARR H_(2)O + 2NO_(2) + [O] xx 10),(""P_(4) + 10[O] rarr P_(4)O_(10)),(P_(4)O_(10) + 6H_(2)O rarr 4 H_(3)PO_(4)),(bar(P_(4) + 20 HNO_(3) rarr underset("Orthophosphoric acid")(4H_(3)PO_(4)) + 2NO_(2) + 4 H_(2)O)):}`
Discussion
11418.

Write preparation of interhalogen compounds and state its uses.

Answer»

Solution :
Preparation: The interhalogen compound can be prepared by the direct COMBINATION or by the action of halogen on lower interhalogen compounds.
`underset("equal volume")(Cl_(2) + F_(2)) overset(437 K)to 2ClF, I_(2) + underset("excess.)(3Cl_(2)) to 2lCl_(3)`
`underset("excess")(Cl_(2) _ 3F_(2)) overset(573 K) to 2ClF_(3), underset("diluted with WATER")(Br_(2) + 3F_(2) to 2BrF_(3))`
`underset("equimolar")(I_(2) + Cl_(2)) to 2lCl, Br_(2) + underset("excess")5F_(2) to 2BrF_(5)`
Uses of interhalogen compounds : These compounds can be used as non AQUEOUS solvents.
They are very useful fluorinating agents.
`CIF_3` and `BrF_3` are used for the PRODUCTION of `UF_6` in the ENRICHMENT of uranium-235
`U_(s) + 3ClF_(3)(g) + 3ClF_(g)`
Discussion
11419.

Which of the following compounds would exhibit co-ordination isomerism:

Answer»

`[Cr(H_2O)_6CI_2]`
`[Cr(NH_3)_6][Co(CN)_6]`
`[Cr(EN)_2]NO_2`
`[NI(NH_3)_6][BF_4]_2`

ANSWER :B
Discussion
11420.

The van't Hoff factor (i) for a dilute solution of K_3[Fe(CN)_6] is:

Answer»

10
4
5
0.25

Answer :B
Discussion
11421.

Which one of the following compounds gives aspirin on reacting with acetic anhydride in the presence of cone H_(2)SO_(4)?

Answer»




ANSWER :B
Discussion
11422.

To an acid solution of an anion, a few drops of KMnO_(4) solution are added. Which of the following, if present will not decolourise the KMnO_(4) solution

Answer»

`CO_(3)^(2-)`
`NO_(2)^(-)`
`SO_(3)^(2-)`
`CL^(-)`

ANSWER :A
Discussion
11423.

Using the Ellingham diagram given below. Predict the conditions under which Aluminium might be expected to reduce magnesia.

Answer»

Solution :MAGNESIUM can reduce ALUMINIUM OXIDE and aluminium can also reduce magnesium oxide.
Discussion
11424.

What is the basic structural difference between starch and cellulose ?

Answer»

Solution :The basic structural difference between STARCH and cellulose is of linkage between glucose UNITS. In starch, there is `alpha`-D glucosidic linkage. But in cellulose, there is a LINEAR POLYMER of `beta`-D-glucose in which `C_1` of one glucose UNIT is connected to `C_4` of the other through `beta`-D-glucosidic linkage.
Discussion
11425.

When MnO_(2) is fused with KOH, a coloured compound is formed then the compound will be

Answer»

 `KMnO_(4)`
`Mn_(3)O_(4)`
 purple ICON lour
 BROWN in colour

Answer :A::C
Discussion
11426.

Which of the following compounds is most basic?

Answer»




Solution :`C_(6)H_(5)CH_(2)NH_(2)` is the strongest base SINCE the lone pair of electrons on the N-atom is not delocalized over the benzene RING while in all the remaining AMINES, it is delocalized over the enzene ring
Discussion
11427.

Whal is the percentage of copper in blister copper?

Answer»

SOLUTION :The PERCENTAGE of COPPER in BLISTER copper is 97-98%
Discussion
11428.

Zinc(II) ion on reaction with NaOH first give a white precipitate which dissolves in excess of NaOH due to the formation of :

Answer»

`ZnO`
`Zn(OH)_(2)`
`[Zn(OH)_(4)]^(2-)`
`[Zn(H_(2)O)_(4)]^(2-)`

Answer :C
Discussion
11429.

Writethe reactions ofnitricacid with - (i) carbon (ii) iodine (iii) sulphureand (iv) phosporus .

Answer»

SOLUTION :(i) `C_((S)) underset("(hot, conc.)")(4HNO_(3)) to CO_(2(s)) + 2H_(2)O_((I)) + 4NO_(2(g))`
(ii) `I_(2) + 10 HNO_(3) to underset("IODIC acid") (2HIO) + 10NO_(2) + 4H_(2)O`
(III) (iii) `S_(8) + 48HNO_(3) to 8H_(2)SO_(4) + 48NO_(2) + 16H_(2)O`
(iv)`P_(4) + 20HNO_(3) to 4H_(3)PO_(4) + 20NO_(2) + 4H_(2)O`
Discussion
11430.

We have three aqueous solutions of NaCl labelled as 'A', 'B and 'C'with concentrations 0.1 M, 0.01 M,respectively. The value of van't Hoff factor for these solutions will be in the order ………….. .

Answer»

`i_(A)lt i_(B)lt i_(C)`
`i_(A)gt i_(B)gti_(C)`
`i_(A)=i_(B)=i_(C)`
`i_(A) lt i_(B) gt i_(C)`

ANSWER :A
Discussion
11431.

What is gold number?

Answer»

Solution :Gold NUMBER is DEFINED as minimum number of milligram of a protective colloid that must ADDED to 10ml of a STANDARD gold solution to PREVENT coagulation when 1 ml of a`10%` aqueous solution of NaCl is added to it. Lower the gold number means greater is the protective power of the protecting colloid and vice versa.
Discussion
11432.

Which is insoluble in water

Answer»

`H_(2)S`
`HgCl_(2)`
`Ca(NO_(3))_(2)`
`CaF_(2)`

SOLUTION :`CaF_(2)` is insoluble in water.
Discussion
11433.

When phenol reacts with benzene diazonium chloride, the product obtained is

Answer»

PHENYL hydrazine
p-amino azobenzene
phenol hydroxylamine
p-hydroxy azobenzene

Answer :D
Discussion
11434.

Which oxide of manganese is amphoteric

Answer»

`MnO_(2)`
`Mn_(2)O_(3)`
`Mn_(2)O_(7)`
`MnO`

SOLUTION :`MnO_(2)` FORMS AMPHOTERIC oxide due to intermediate oxidation state.
Discussion
11435.

Which of the following compound give methane on treatment with CH_3MgI

Answer»




SOLUTION :
Discussion
11436.

Which of the following is an example of associated colloid?

Answer»

Protein + Water
Soap + Water
Rubber + BENZENE
`As _(2) O_(3)+Fe[OH]_(3).`

Answer :B
Discussion
11437.

Which noble gas is used in filling ballons for meteorological observation ?

Answer»

SOLUTION :Helium is USED for FILLING BALLOONS for meterorological observation because it is non-inflammable.
Discussion
11438.

Which of the following will not form Grignard reagent with Mg/dry ether ? (1) CH_2Br-CH_2Br(2) CH_2Br-CH_2-CH_2Br Select the correct answer using the codes gives below

Answer»

Only (4)
Only (2)
1,2,and 3
1,2,3 and 4

Answer :C
Discussion
11439.

What percent of octahedral voids are occupied by cation in a rock-salt structure ?

Answer»

`100%` 
`50%`
`33%` 
`25%` 

ANSWER :A
Discussion
11440.

Which compound is prepared by the following

Answer»

`XeF_4`
`XeF_2`
`XeF_6`
NONE of these

Answer :B
Discussion
11441.

The standard reduction potential of four elements A, B, C, D, are -3.05V. -1.66 V, - 0.40 V, +0.80V. The highest electropositivity in aqueous media among these will be shown by:

Answer»

A
B
C
D

Answer :A
Discussion
11442.

Which of the following molecules is not an exception to the octet rule ?

Answer»

`BF_(3)`
`CO_(2)`
`IF_(7)`
`PF_(5)`

Answer :B
Discussion
11443.

When 400 mL of 0.2 N solution ofa weak acid is neutralized by a dilute aqueous solution of sodium hydroxide un der standard conditions, 4.4 kJ amount of heat is liberated. Therefore, the standard enthalpy of neutralization of this weak acid in kJ equiv""^(-1) is

Answer»

`-11`
`-44`
`-55`
`-22`

Answer :C
Discussion
11444.

Which ofthefollowingstatementisfalse ?

Answer»

40 % solutionHCHOisknownasformalin
HCHOisleastreactivein itshomologousseries
Theboilingpointof ISO - vareladehydeless thann- varelaldehyde(4 )
Theboilingpointofketones arehigherthanthatofaldehydes

Solution :Formaldehydeisthe mostreactiven itshomologousseries. Orderofreactivityofsomealdehydesis as follows.
` HCHO gt CH _ 3CHO gt CH_ 3 CH_ 2CHO`
Discussion
11445.

Which gives aldehyde on hydration by H_(2)SO_(4) and HgSO_(4)

Answer»

`CH_(3)-C=-CH`
`CH_(3)C=-C-CH_(2)-CH_(3)`

ANSWER :D
Discussion
11446.

Which of the following substances has the greatest ionic character ?

Answer»

`Cl_(2)O`
`NCl_(3)`
`PbCl_(2)`
`BaCl_(2)`

Solution :According to Fajan.s rule :
Covalent character `prop (1)/("size or cation" prop "sizer of anion")`
Among the given species order of sizer of cations
`N^(3+),O^(2+) lt PB^(2+), lt Ba^(2+)`
Order of size of ANIONS `O^(2) gt Cl^(-)`
Hence the order of covalent character is
`NCl_(3) gt Cl_(2) O gt PbCl_(2) gt BaCl_(2)`
`Bcl_(2)` is m ost ionicin nature
Discussion
11447.

White phosphorous is also called as, ……………… .

Answer»

RED phsophorous
BLACK PHOSPHOROUS
Scarlest phosphorous
YELLOW phosphorous

Solution :Yellow phosphorous
Discussion
11448.

The spin magnetic moment of cobalt in Hg[Co(SCN)_(5)] is

Answer»

`sqrt(3)`
`sqrt(8)`
`sqrt(15)`
`sqrt(24)`

ANSWER :C
Discussion
11449.

When 2-butanol is heated with an excess of concentrated sulphuric acid, the main product is

Answer»

1-Butene
2-Butene
2-Methyl propene
2-Methyl-2-butene

Answer :B
Discussion
11450.

Which of the following order is not correct :-

Answer»

`H_(2)O gt HF gt NH_(3)` mpt
`CH_(3)-O-CH_(3) lt C_(2)H_(5)-OH` bpt
`(CH_(3))_(2)SO_(4) gt H_(2)SO_(4)`volatility
`HCL gt HF`(BOILING point)

Answer :D
Discussion