Free MCQs & Online Quiz Practice for Exams

Q: What is the oxidation number assigned to manganese in KMnO₄

A) +7

B) +3

C) +2

D) +4

Q: In a particular redox reaction the oxidation number of phosphorus changed from -3 to 0 From this information it may be concluded that phosphorus

A) Lost 3 electrons and was reduced

B) Lost 3 electrons and was oxidized

C) Gained 3 electrons and was reduced

D) Gained 3 electrons and was oxidized

Q: Which statement is true for an electrochemical cell

A) Oxidation occurs at the anode only

B) Reduction occurs at the anode only

C) Oxidation occurs at both the anode and cathode

D) Reduction occurs at both the anode and cathode

Q: In which of the following does sulphur have an oxidation number of +7

A) HSO₃

B) SO₃

C) H₂SO₄

D) H₂S₂O₈

Q: What happens to the reducing agent in an oxidation-reduction reaction

A) It is oxidized as it gains electrons

B) It is oxidized as it loses electrons

C) It is reduced as it gains electrons

D) It is reduced as it loses electrons

Q: In an electrochemical cell electrons travel in which direction

A) From the anode to the cathode through the external circuit

B) From the anode to the cathode through the salt bridge

C) From the cathode to the anode through the external circuit

D) From the cathode to the anode through the salt bridge

Q: Which one of the groups below contains only ionic compounds?

A) Calcium Oxide, Hydrogen Chloride, Magnesium Oxide

B) Calcium Oxide, Magnesium Oxide, Sodium Chloride

C) Carbon Dioxide, Copper Sulphate, Hydrogen Chloride

D) Copper Sulphate, Methane, Sodium Chloride

Q: An atom with a charge is called

A) an electron

B) a molecule

C) a metal

D) an ion

Q: An element X is in group VI of the periodic table. The ion will be represented by

A) X⁺

B) X²⁻

C) X³⁻

D) X⁻

Q: Which pair of elements will join to form a compound with one to one ratio

A) Magnesium and Chlorine

B) Sodium and Oxygen

C) Potassium and Fluorine

D) Lithium and Sulphur

Q: When calcium atom becomes a calcium ion (Ca²⁺)

A) it loses an electron

B) it gains electron

C) it loses two electrons

D) it gains two electrons

Q: Which two elements will form a covalent compound

A) Sodium and Oxygen

B) Carbon and Oxygen

C) Copper and Oxygen

D) Magnesium and Oxygen

Q: In the formation of an ionic bond the atoms taking part

A) only gain electrons

B) share electrons

C) lose and gain of electrons

D) Only lose electrons

Q: Fluorine has an electronic configuration 2,7 and Oxygen 2,6. The formula of fluorine oxide will be

A) FO

B) c) OF₂

C) d) F₂O₂

D) F₂O

Q: Which of these statements about covalent bonds is incorrect

A) HCl contains one pair of shared electrons

B) CCl₄ contains four pairs of shared electrons

C) H₂O contains three pairs of shared electrons

D) NH₃ contains three pairs of shared electrons

Q: Which of the following ions do not have the electronic configuration of an argon atom

A) Ca²⁺

B) None of them

C) K⁺

D) Ar

Q: Ms. Aisha was busy in dissecting and analyzing the heart of frog. Probably she is a:

A) Cell biologist

B) Taxonomist

C) Histologist

D) Palaeontologist

Q: How many people get lung cancer by smoking? This question can be answered through:

A) Biometry

B) Biophysics

C) Bio-economics

D) Biogeography

Q: Al-Qanun fil-Tibb is the famous book of:

A) BU Ali Sina

B) Jabir bin Hayyan

C) Abdul Malik Asmai

D) Ibn Nafees

Q: One of the following contains large number of cells but is not multicellular:

A) Frog

B) Volvox

C) Mushroom

D) Chlamydomonas