- (A) Location of nucleus by Rutherford
- (B) Atomic number by Moseley
- (C) X-rays by Roentgen
- (D) Natural radioactivity by Henry Bacquerel.
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- (A) Melting point of elements
- (B) Boiling point of elements
- (C) Ionization energy of elements
- (D) Coordination number of ions
- (A) Boron & Beryllium
- (B) Nitrogen & Phosphorous
- (C) Magnesium & Aluminium
- (D) Gallium & Helium
- (A) Same number of electrons in the valence shell
- (B) Similar physical state
- (C) Remarkable reducing properties
- (D) Homovalent (show same valency)
- (A) Acidic
- (B) Basic
- (C) Acidic and basic
- (D) Neutral and acidic
- (A) 2
- (B) 4
- (C) 8
- (D) 7
- (A) 2
- (B) 4
- (C) 6
- (D) 8
- (A) Acetic acid
- (B) Formic acid
- (C) Carbonic acid
- (D) Benzoic acid
- (A) Oxalic acid
- (B) Succinic acid
- (C) Adipic acid
- (D) Acetic acid
- (A) Aromatic
- (B) Dicarboxylic
- (C) Hydrocarbons
- (D) Strong acids
