Chemistry Mcqs

Many properties of an element and its compounds can be predicted from the position of the element in the periodic table. What property could not be predicted in this way ?

• (A)  The nature of its oxides
• (B)  The charge on its ions
• (C)  The formula of its oxide
• (D)  Its number of isotopes

Answer

Submitted By :Ali Uppal

The longest period in the modern periodic table is___________________?

• (A)  6th
• (B)  7th
• (C)  2nd and 3rd both
• (D)  5th

Answer

Submitted By :Ali Uppal

Noble gases are named so because they are__________________?

• (A)  less reactive
• (B)  Zero group elements
• (C)  Having completely filled valence shell
• (D)  All

Answer

Submitted By :Ali Uppal

Which element was not known when Mendeleev proposed his classification ?

• (A)  Hydrogen
• (B)  Sodium
• (C)  Copper
• (D)  Germanium

Answer

Submitted By :Ali Uppal

The scientist who did not contribute in the construction of periodic table ?

• (A)  Al-Razi
• (B)  Moseley
• (C)  Dobereiner
• (D)  Democritus

Answer

Submitted By :Ali Uppal

Among halogens the highest boiling point is of___________________?

• (A)  Flrorine
• (B)  Chlorine
• (C)  Bromine
• (D)  Iodine

Answer

Submitted By :Ali Uppal

Which of the following always increases on going from top to bottom in a group ?

• (A)  Metallic character
• (B)  Electronegativity
• (C)  Oxidizing power
• (D)  Tendency to get reduced

Answer

Submitted By :Ali Uppal

An element having low value of ionization energy and low value of electron affinity is likely to belong to__________________?

• (A)  Group IA
• (B)  Group IB
• (C)  Group VIIA
• (D)  Group VIII

Answer

Submitted By :Ali Uppal

Which of the following cannot exist in solution_________________?

• (A)  O-2
• (B)  H+
• (C)  Cl-
• (D)  Na+

Answer

Submitted By :Ali Uppal

Which one of the following element has highest oxidation state in its compounds ?

• (A)  Cr
• (B)  Mn
• (C)  Sn
• (D)  O

Answer

Submitted By :Ali Uppal