P-Block Elements MCQs | P-Block Elements Multiple Choice Questions and Answers

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Questions
1 Which statement correct about halogens?
A They are all diatomic and form univalent ions
B They are all capable of exhibiting several oxidation stables
C They are all diatomic and form diatomic ions
D They are all reducing agents

Answer: They are all diatomic and form univalent ions
2 Which one of the following is the strongest acid?
A SO (OH)2
B SO2(OH)2
C ClO2(OH)
D ClO3(OH)

Answer: ClO3(OH)
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3 Fluorine react with water to give :
A Hydrogen fluoride and oxygen
B Hydrogen fluoride and ozone
C Hydrogen fluoride and oxygen fluoride
D Hydrogen fluoride, oxygen and ozone

Answer: Hydrogen fluoride, oxygen and ozone
4 Oxidising action increases from left to right in the order:
A Cl2 < Br2 < I2 < F2
B Cl2 < I2 < Br2 < F2
C I2 < F2 < Cl2 < Br2
D I2 < Br2 < Cl2 < F2

Answer: I2 < Br2 < Cl2 < F2
5 The solubility of iodine in water is greatly increased by :
A Adding an acid
B Boiling the solution
C Cooling the solution
D Adding potassium iodide

Answer: Adding potassium iodide
6 The correct statement is :
A SO2 is the anhydride of sulphurous acid
B H2S is the anhydride of hydrosulphuric acid
C NO2 is the anhydride of HNO3
D HCL is anhydride of HCl

Answer: SO2 is the anhydride of sulphurous acid
7 When excess of Kl is added to copper sulphate solution:
A Cuprous iodide is formed
B I2 is liberated
C Potassium iodide is oxidized
D all

Answer: all
8 Gaseous HCl is a poor conductor of electricity while its aqueous solution is a good conductor this is because :
A H2O is a good conductor of electricity
B a gas cannot conduct electricity, but a liquid can
C HCl gas does not obey ohm’s law; whereas the solution does
D HCl ionizes in aqueous solution

Answer: HCl ionizes in aqueous solution
9 Which reaction yield the greatest quantity of chlorine form a given quantity of hydrochloric acid ?
A Warming con, HCl with KMno2
B Warming con. HCl with pbO2
C Maxing conc. HCl with KMnO4
D Treating beaching powder with HCl

Answer: Treating beaching powder with HCl
10 Iodine is placed between two liquids C6H6 and water :
A It dissolve more in C6H6
B It dissolve more in water
C It dissolve equally in both
D Does not dissolve in both

Answer: It dissolve more in C6H6
11 If Cl2 gas is passed in to aqueous solution of Kl containing some CCl4 and the mixture is shaken then:
A Upper layer becomes violet
B Lower layer becomes violet
C Homogenous violet layer is formed
D None of these

Answer: Lower layer becomes violet
12 K2[HgI4] detect the ion/group :
A NH2
B NO
C NH4+
D Cl–

Answer: NH4+
13 Which pair give Cl2 at room temperature?
A conc. HCl + KMnO4
B NaCl + conc. H2SO4
C NaCl + MnO2
D NaCl + conc. NHO3

Answer: conc. HCl + KMnO4
14 Among the C – x bond (where X = Cl, Br, I) the correct bond energy order is:
A C – Cl > C – Br < C– I
B C – l > C – Cl > C – Br
C C – Br > C – Cl > C – I
D C – l > C – Br > C – CI

Answer: C – Cl > C – Br < C– I
15 The bonds present in N2O5 are:
A Only ionic
B Only covalentC
C Co-valent and co-ordinate
D Covalent and ionic

Answer: Co-valent and co-ordinate
16 Which of the following is/are paramagnetic:
A Only NO2
B NO2, NO
C NO, NO2, N2O5
D All are paramagnetic

Answer: NO2, NO
17 Nitrogen (I) oxide is produced by:
A Thermal decomposition of ammonium nitrate
B Disproportionation of N2O4
C Thermal decomposition of ammonium nitrite
D none of the above

Answer: Thermal decomposition of ammonium nitrate
18 The gas which does not show oxidising and bleaching property:
A Chlorine
B Ozone
C Sulphure dioxide
D Nitrocellulose is formed

Answer: Nitrocellulose is formed
19 Dinitrogen tetroxide N2O4, is mixed anhydride because it:
A Is mixture of N2O3 and N2O5
B Decomposes into two oxides of nitrogen reacts
C Reacts with water to form nitric acid
D Reacts with water to form two acid

Answer: Decomposes into two oxides of nitrogen reacts
20 Fixation of nitrogen means:
A Reaction of nitrogen with oxygen
B Conversion of free atmospheric nitrogen into nitrogen compound
C Decomposition of nitrogenous compounds to yield free nitrogen
D The action of denitrifying bacteria on nitrogen compound

Answer: The action of denitrifying bacteria on nitrogen compound
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