CBSE Class 12 The p Block Elements Multiple Choice Questions with Answers. MCQ Questions Class 12 The p Block Elements with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 The p Block Elements MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 The p Block Elements with Answers - Set - 5
Question 1:
H3PO2 is the molecular formula of an acid of phosphorus. Its name and basicity respectively are
(a) phosphorous acid and two
(b) hypophosphorous acid and two
(c) hypophosphorous acid and one
(d) hypophosphoric acid and two.
Correct Answer – (C)
Question 2 :
Oxidation states of P in H4P2O5, H4P2O6, H4P2O7 are respectively
(a) +3, +5, +4
(b) +5, +3, +4
(c) +5, +4, +3
(d) +3, +4, +5
Correct Answer – (D)
Question 3 :
Strong reducing behaviour of H3PO2 is due to
(a) high electron gain enthalpy of phosphorus
(b) high oxidation state of phosphorus
(c) presence of two —OH groups and one P—H bond
(d) presence of one —OH group and two P—H bonds
Correct Answer – (D)
Question 4 :
Which of the following oxoacids of phosphorus has strongest reducing property?
(a) H4P2O7
(b) H3PO3
(c) H3PO2
(d) H3PO4
Correct Answer – (C)
Question 5 :
Identify the incorrect statement related to PCl5 from the following :
(a) PCl5 molecule is non-reactive.
(b) Three equatorial P – Cl bonds make an angle of 120° with each other.
(c) Two axial P – Cl bonds make an angle of 180° with each other.
(d) Axial P – Cl bonds are longer than equatorial P – Cl bonds.
Correct Answer – (A)
MCQ Questions Class 12 The p Block Elements with Answers
Question 6:
How many bridging oxygen atoms are present in P4O10?
(a) 6
(b) 4
(c) 2
(d) 5
Correct Answer – (A)
Question 7:
Which of the following statements is not valid for oxoacids of phosphorus?
(a) Orthophosphoric acid is used in the manufacture of triple superphosphate.
(b) Hypophosphorous acid is a diprotic acid.
(c) All oxoacids contain tetrahedral four coordinated phosphorus.
(d) All oxoacids contain atleast one P O unit and one P—OH group
Correct Answer – (B)
Question 8:
Which is the correct statement for the given acids?
(a) Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid.
(b) Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid.
(c) Both are diprotic acids.
(d) Both are triprotic acids.
Correct Answer – (A)
Question 9:
PCl3 reacts with water to form
(a) PH3
(b) H3PO3, HCl
(c) POCl3
(d) H3PO4
Correct Answer – (B)
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