Plus One Chemistry Important Questions and Answers. We covered all the Plus One Chemistry Important Questions and Answers in this post for free so that you can practice well for the exam.
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Plus One Chemistry Important Objective Questions and Answers for Students
Which of the following statements is not correct for SO₂ gas?
(A) It acts bleaching agent in moist conditions.
(B) Its dilute solution is used as a disinfectant.
(C) Its molecules have linear geometry.
(D) Acidified KMnO4 is decolourised when SO₂ is passed through it.
Option c – Its molecules have linear geometry
Which of the following statements is not correct?
(A) The oxygen molecule is paramagnetic with two unpaired electrons.
(B) Sulphur shows maximum covalency of four.
(C) Ozone can be easily detected by mercury.
(D) Both sulphurous and sulphuric acid are dibasic in nature.
Option b – Sulphur shows maximum covalency of four
In which of the following sulphur is present in the +5 oxidation state?
(A) Dithionic acid
(B) Sulphurous acid
(C) Sulphuric acid
(D) Disulphuric acid
Option a – Dithionic acid
Sulphur trioxide is not directly dissolved in water to form sulphuric acid because
(A) SO3 does not react with water to form acid
(B) SO3 gets oxidised to H₂SO3 when dissolved in water.
(C) It results in the formation of a dense fog of sulphuric acid which is difficult to condense.
(D) Sulphur trioxide is insoluble in water due to its covalent nature.
Option c – It results in the formation of a dense fog of sulphuric acid which is difficult to condense
The dissolution of sulphuric acid in water is
(A) An endothermic process
(B) An exothermic process
(C) A dehydrating process
(D) A displacement process
Option b – An exothermic process
The covalency of oxygen cannot exceed 2, unlike sulphur which can show +4 or +6 because
(A) Oxygen atom does not have d-orbitals.
(B) The oxygen atom has two unpaired electrons in its valance shell.
(C) Oxygen can form a double bond with another oxygen atom.
(D) Electrons of oxygen atoms cannot be promoted to d-orbitals due to their small size.
Option a – Oxygen atom does not have d-orbitals
Which of the following is not correctly matched?
(A) Acidic oxides – P2O5, NO2, Cl₂07
(B) Basic oxides – Na2O, CaO, MgO
(C) Neutral oxides – CO₂, CO, BeO
(D) Amphoteric oxides – ZnO, SnO, Al2O3
Option c – Neutral oxides – CO₂, CO, BeO
Why is sulphur dioxide considered as air pollution?
(A) It increases the temperature of the atmosphere.
(B) It is used as an insecticide which causes air pollution.
(C) causes acid rain due to the formation of sulphuric acid in combination with O₂ and H₂O.
(D) It is a strong oxidising agent and hence oxidises the other components of air.
Option c – causes acid rain due to the formation of sulphuric acid in combination with O₂ and H₂O
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