p-Block Elements  MCQs

MCQs of p-Block Elements

Showing 151 to 160 out of 173 Questions
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151.
Decide whether the following statements are true or false.

(1) The oxidation number of chlorine in perchloric acid is +7.

(2) Fluorine forms only one oxoacid HOF, which is called hypofluorous acid.

(3) IF7 is a colourless gas with pentagonal bipyramidal structure.

(4) Hydrochloric acid reacts with ammonia gas and produces white clouds (fumes) of NH4Cl. In this reaction NH3 is reduced.

(5) The molecular formula of phosgene, phosphine and tear gas are respectively PH3, COCl2 and CCl3 . NO2.

(6) HCl and HOCl are formed on long standing of chlorine water. Hence the colour of chlorine water changes from colourless to yellow.

(a) TFFFTT
(b) TFFTFT
(c) TTTFTF
(d) FTFTTF
Answer:

Option (c)

152.
What is used as promoter in small proportion with catalyst FeO used in manufacture of ammonia gas ?
(a) K2O.Fe2O3
(b) Al2O3.CrO2
(c) K2O.Fe3O4
(d) K2O.Al2O3
Answer:

Option (d)

153.
What is the shape of PCl5 in liquid and gaseous states ?
(a) Trigonal bipyramidal
(b) Pyramidal
(c) Angular
(d) Tetrahedral
Answer:

Option (a)

154.
Nitrogen element exists as dinitrogen gas having triple bond. Mention the correct statement for this.
(a) Its size and electronegativity is more hence it does not form pπ-pπ bond.
(b) Its size is small and electronegativity is high, hence it forms pπ-pπ bond.
(c) dπ-pπ bond can be formed in it.
(d) None of the above.
Answer:

Option (b)

155.
Which of the following elements does not belong to p-block ?
(a) Sr
(b) Po
(c) As
(d) Ga
Answer:

Option (a)

156.
How many atoms of sulphur are arranged in cyclic form in the crystal of monoclinic sulphur ?
(a) 2
(b) 10
(c) 8
(d) 6
Answer:

Option (c)

157.
NCl3 is possible but NCl5 is not possible in case of nitrogen. For phosphorus, PCl3 and PCl5 - both are possible. The reason for this is _____ .
(a) P-atom possesses vacant d-orbital; while N-atom does not possess.
(b) the electronegativity of P is less than that of N
(c) the tendancy to form hydrogen bond in phosphorus is less than that in nitrogen
(d) at normal temperature, phosphorus is solid, while nitrogen possesses gaseous state
Answer:

Option (a)

158.
The number of single electron pairs on Xe-atom in XeF2, XeF4 and XeF6 are respectively _____ .
(a) 2, 3, 1
(b) 1, 2, 3
(c) 4, 1, 2
(d) 3, 2, 1
Answer:

Option (d)

159.
Mention the correct order of stability of dihalides of Si, Ge, Sn and Pb.
(a) GeX2 < SiX2 < SnX2 < PbX2
(b) SiX2 < GeX2 < PbX2 < SnX2
(c) SiX2 < GeX2 < SnX2 < PbX2
(d) PbX2 < SnX2 < GeX2 < SiX2
Answer:

Option (a)

160.
Which of the rows in the following arrangements is not according to the property mentioned against it ?
(a) B < C < O < N

The first ionization enthalpy increases.

(b) CO2 < SiO2 < SnO2 < PbO2

The strength as oxidizing agent increases.

(c) HF < HCl < HBr < HI

Acidic strength increases.

(d) NH3 < PH3 < AsH3 < SbH3

Basic strength increases.

Answer:

Option (d)

Showing 151 to 160 out of 173 Questions
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