p-Block Elements  MCQs

MCQs of p-Block Elements

Showing 51 to 60 out of 173 Questions
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51.
Give the correct order of stability of halide compound of group-16.
(a) F- > Cl- > Br- > I-
(b) Br- > I- > F- > Cl-
(c) I- > Br- > Cl- > F-
(d) Cl- > F- > I- > Br-
Answer:

Option (a)

52.
Which of the following is a basic oxide ?
(a) CO2
(b) SO2
(c) N2O
(d) Na2O
Answer:

Option (d)

53.
What is the complex obtained when Al2O3 reacts with aqueous solution of HCl ?
(a) [Al(H2O)6]2+
(b) [Al(H2O)6]3+
(c) [AlCl6]-3
(d) [Al(H2O)4Cl2]+
Answer:

Option (b)

54.
How much potential is applied between Al-rods in Siemens - Halske's ozonizer ?
(a) 8,000 - 10,000 V
(b) 30,000 - 40,000 V
(c) 3,000 - 8,000 V
(d) 1,000 - 2,000 V
Answer:

Option (a)

55.
What is the colour of ozone gas ?
(a) Deep blue
(b) Deep violet
(c) Light blue
(d) Deep red
Answer:

Option (c)

56.
Which of the following is incorrect regarding the utilities of ozone ?
(a) As an oxidizing agent in the manufacture of KMnO4.
(b) To sterilize drinking water.
(c) As a bleaching agent in the bleaching of starch.
(d) In Holme's signal.
Answer:

Option (d)

57.
Name the gas used to bleach starch.
(a) H2O2
(b) O3
(c) O2
(d) N2
Answer:

Option (b)

58.
How many atoms of sulphur are arranged in cyclic fashion in the crystal of monoclinic allotrope of sulphur ?
(a) 2
(b) 10
(c) 8
(d) 6
Answer:

Option (c)

59.
At which temperature (allotropes) rhombic sulphur and monoclinic sulphur are stable ?
(a) 396 K
(b) 936 K
(c) 369 K
(d) 639 K
Answer:

Option (c)

60.
Which of the following statements is wrong ?
(a) ONCl and ONO- are not isoelectronic.
(b) O3 is a bent molecule.
(c) Ozone is dark violet in solid state.
(d) Ozone is a diamagnetic gas.
Answer:

Option (a)

Showing 51 to 60 out of 173 Questions
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