Free Periodic Properties and Trends MCQs with Answers

• A. Bitumen
• B. Bauxite
• C. Metalloids
• D. Ores

Explanation: Metal-bearing rocks from which metals can be extracted economically are called ores.

• A. Electronic shells
• B. Proton shells
• C. Neutron shells
• D. Nucleus

Explanation: Atomic radius increases down a group because each successive element contains an additional occupied electronic shell, placing the outer…

• A. Mn
• B. Ni
• C. Sb
• D. Sn

Explanation: Cassiterite is tin(IV) oxide, SnO2, so it is an important ore of tin, Sn.

• A. Cl
• B. Br
• C. I
• D. F

Explanation: Chlorine has the greatest electron affinity among these elements because its larger atomic size allows an incoming electron to enter…

• A. 2
• B. 3
• C. 4
• D. 5

Explanation: Orthophosphoric acid, H3PO4, has three ionisable hydrogen atoms attached to oxygen, so its basicity is 3.

• A. H3PO3
• B. H3PO4
• C. H3PO2
• D. H2P2O7

Explanation: In H3PO2, hydrogen has oxidation state +1 and oxygen has -2, so 3(+1) + P + 2(-2) = 0, giving P = +1.

• A. smelting
• B. roasting
• C. calcinations
• D. froth floatation

Explanation: Smelting is the metallurgical process in which a metal or its compound is heated strongly, often with a reducing agent, to produce the…

• A. +3
• B. +2
• C. +1
• D. +4

Explanation: Lanthanides most commonly lose their two 6s electrons and one additional electron to form the stable oxidation state +3.

• A. Be
• B. Cl
• C. K
• D. P

Explanation: Beryllium is called a bridge or diagonal element because it shows similarities with aluminium, which lies diagonally below it in the…

• A. Lother Meyer
• B. A.E de Chancourtois
• C. Newland
• D. Dobereiner

Explanation: The telluric helix was proposed by A.E. de Chancourtois, who arranged elements around a cylinder in order of increasing atomic weight and…

• A. Li, Be, B
• B. F, Cl, Br
• C. Cl, Br, I
• D. Na, K, Rb

Explanation: Dobereiner's triads contain three elements with similar properties, such as chlorine, bromine and iodine, written as F, Cl and Br in the…

• A. Fe>Co> Ni
• B. Co > Ni > Fe
• C. Ni> Co> Fe
• D. Co >Fe>Ni

Explanation: The atomic weights are Fe = 55.85 g mol-1, Co = 58.93 g mol-1 and Ni = 58.69 g mol-1.

• A. Cl2O
• B. Cl2O6
• C. ClO2
• D. Cl2O7

Explanation: The anhydride of an oxyacid is formed by removing water from the acid. For perchloric acid, 2HClO4 loses H2O to give Cl2O7, so the…

• A. XeF4
• B. XeOF4
• C. XeOF2
• D. Na4XeO6

Explanation: In XeOF4, fluorine contributes 4 x -1 = -4 and oxygen contributes -2, so xenon must be +6 because x - 4 - 2 = 0 and x = +6.

• A. HF
• B. HBr
• C. HC
• D. HI

Explanation: The reducing strength of hydrogen halides increases down the group because the H-X bond becomes weaker, making the halide ion more willing…

• A. Xe
• B. Kr
• C. Rn
• D. All of the above

Explanation: Fluorine is sufficiently reactive to form compounds with the noble gases xenon, krypton and radon under suitable conditions, such as XeF2…

• A. All are non-metals
• B. All the halogens have electronic conviguration ns2p5
• C. They have high electron attinity and ionization energy
• D. All the halogens react with noble gases to form their halides

Explanation: Halogens do not all react with noble gases to form halides; noble gases are generally unreactive, although some xenon and krypton…

• A. Fluorine
• B. Chlorine
• C. Bromine
• D. Iodine

Explanation: Fluorine has the highest electronegativity because its very small atomic radius and strong effective nuclear attraction pull bonding…

• A. I2O4
• B. I4O2
• C. I2O5
• D. All are equally useful

Explanation: Iodine(V) oxide, I2O5, quantitatively oxidizes carbon monoxide to carbon dioxide: I2O5 + 5CO → I2 + 5CO2.

• A. Normal salt
• B. Double salt
• C. Mixed salt
• D. Complex

Explanation: Bleaching powder is represented approximately as Ca(OCl)Cl or CaOCl2 and contains chloride and hypochlorite ions associated with calcium…