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CHEMISTRY THE P-BLOCK ELEMENTS-11th
QUIZ-18

Dear Readers,

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies.
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything.
.

Q1.Diborane is a Lewis acid forming addition compound B2H6.2NH3 with NH3, a Lewis base. This
  • Is ionic and exists as [BH2(NH3)2]+ and [BH4]- ions
  • On heating is converted into borazine, B3N3H6 (called inorganic benzene)
  • Both (a) and (b) are correct
  • None of the above is correct
Solution
Both (a) and (b) are correct
Q2.When a mixture of carbon monoxide and chlorine is exposed to sunlight the product formed is
  •  Thionyl chloride
  •  Phosgene
  •  Phosphine
  •  Carbon tetrachloride
Solution
CO + Cl2 → COCl2
                   phosgene
Q3.Nitric oxide is paramagnetic in
  •  Gaseous state
  •  Liquid state
  •  Solid state
  •  Polymeric state
Solution
Gaseous state.
Nitric oxide is gas at temperature above 123K. 7 electron of nitrogen and 6 of oxygen, 6 paired and one unpaired electron are present.
Nitric oxide (NO) have one unpaired electron in gaseous state so it is paramgnetic in gaseous state.

Q4.Nitrosonium ion (NO+) is isoelectronic with
  •  Carbon dioxide
  •  Carbon monoxide
  •  Nitrogen dioxide
  •  Nitric oxide
Solution
Carbon monoxide
Nitrosonium ion (NO+) has 14 electrons and so, it is isoelectronic with CO, which also has 14 electrons.
Nitric oxide (NO), carbon dioxide (CO2) and nitrogen dioxide (NO2) have 15, 22 and 23 electrons respectively.

Q5.Select the incorrect statement
  •  Mellitic acid is benzene hexa-carboxylic acid
  •  Pb dissolves in conc. HCl forming PbCl2
  •  Pb dissolves in hot NaOH forming Na2[Pb(OH)6]
  •  Diamond is unreactive but graphite forms (CF)n with F2
Solution
H2PbCl6 is formed

Q6.Concentrated nitric acid, upon long standing turns yellow-brown due to the formation of
  •  NO
  •  NO2
  • N2O
  •  N2O4
Solution
4HNO3 → 2H2O+ 2NO2 + 3O2

Q7.The sides of safety matches contain
  •  Red phosphorus + sand powder
  •  P4S3
  •  Ca3PO4 + glass pieces
  •  KClO3, KNO3, sulphur + antimony
Solution
Red phosphorus + sand powder
The sides of safety matches contains red phosphorus + sand powder. While the head of match stick contain P4S3

Q8.Alum is found to contain hydrated monovalent cation [M(H2O)6]+, trivalent cation [M'(H2O)6]3+ and SO42- in the ratio of
  •  1:1:1
  •  1:2:3
  •  1:3:2
  •  1:1:2
Solution
1:1:2
The formula of alum is K2SO4.Al2(SO43.24H2O.
There are 2 monovalent cation, 2 trivalent cations and 4SO4−2 ion.
Thus the ratio of hydrated monovalent cation, trivalent ion and SO4−2 ion is 1:1:2.



Q9.NaNO2 and NaNO3 are used as food additives and generally added to meat to
  •  Retard oxidation of meat to brown coloured material
  •  Prevent growth of botulism bacteria
  •  Impart red colour to oxidized meat by NO by reaction of heme in blood
  •  Make all of the functions given above effective
Solution
Make all of the functions given above effective
Q10. Select the correct statements
  •  Catenation is maximum is carbon
  •  Carbon has pronounced ability to form pπ-pπ multiple bonds to itself and to other elements like O and N
  •  Both (a) and (b) are correct
  • None of the above is correct
Solution
C=C, C=O, C≡N

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