p-Block Elements  MCQs

MCQs of p-Block Elements

Showing 121 to 130 out of 173 Questions
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121.
Which acid is obtained by dissolving PCl3 in water ?
(a) H3PO3
(b) H3PO2
(c) H3PO4
(d) H4P2O7
Answer:

Option (a)

122.
Mention the decreasing order of ionic characteristics of M-X bond.
(a) M-Cl > M-I > M-Br > M-F
(b) M-F > M-Cl > M-Br > M-I
(c) M-I > M-Br > M-Cl > M-F
(d) M-I > M-Cl > M-Br > M-I
Answer:

Option (b)

123.
Mention the correct order of stability of halide compounds.
(a) HF > HCl > HBr > HI
(b) HF < HCl < HBr < HI
(c) HI < HCl < HH < HBr
(d) HCl > HBr > HI > HF
Answer:

Option (a)

124.
Which of the following properties is applicable to dichlorine gas ?
(a) It gives chloride and chlorate by reaction with cold and dilute alkali.
(b) Mixture of chloride and hypochlorite is obtained by reaction with cold and dilute alkali.
(c) Reacts with hot and concentrated alkali and gives chloride and chlorate.
(d) (B) and (C)
Answer:

Option (a)

125.
Which substance is obtained by reaction of hot and concentrated NaOH with Cl2 ?
(a) NaOCl
(b) NaClO3
(c) NaClO4
(d) NaClO2
Answer:

Option (b)

126.
When chlorine water is kept open for a long period, then _____
(a) HCl is formed.
(b) HOCl is formed.
(c) HCl and HOCl are formed.
(d) Solution becomes yellow colored.
Answer:

Option (c)

127.
Which is the real order of basicity of hydrides of elements of Group-15 ?
(a) NH3 < PH3 < AsH3 < SbH3 < BiH3
(b) BiH3 < SbH3 < AsH3 < PH3 < NH3
(c) NH3 > PH3 > BiH3 > AsH3 > SbH3
(d) NH3 > PH3 > AsH3 > SbH3 > BiH3
Answer:

Option (d)

128.
What will be the molecular formula of bromic acid ?
(a) HOBrO
(b) HOBrO3
(c) HOBrO2
(d) HOBrO4
Answer:

Option (d)

129.
In which of the following compounds there is only one nonbonding electron pair ?
(a) XeOF4
(b) XeF2
(c) XeF4
(d) All the given
Answer:

Option (a)

130.
Which form of allotropes of phosphorus burns easily in air ?
(a) Red
(b) Yellow
(c) Black
(d) None of these
Answer:

Option (b)

Showing 121 to 130 out of 173 Questions
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