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Correct Answer: B) Damp litmus paper turns red then decolourises.
Correct Answer: C) Positive nuclei are attracted to a shared pair of electrons.
Correct Answer: C) Double Displacement.
Correct Answer: B) Atom.
Correct Answer: C) Methane, ethane, propane, butane.
Correct Answer: D) 2-iodobutane.
Correct Answer: D) Protons + neutrons.
Correct Answer: C) Magnesium and hydrochloric acid.
Correct Answer: C) CO is two elements and Co is only one element.
Correct Answer: C) Heat.
Correct Answer: B) They have different molecular formula.
Correct Answer: C) Symbol.
Correct Answer: C) Isotope.
Correct Answer: A) 3.
Correct Answer: D) Ionises partially in water to produce hydrogen ions.
Correct Answer: D) Pentane, hexanol, heptane, octane.
Correct Answer: C) 1:1.
Correct Answer: B) 2:3.
Correct Answer: D) Both mL and cm3.
Correct Answer: C) Gas.
Correct Answer: C) 2-iodo-2-methylpropane.
Correct Answer: A) Atomic #.
Correct Answer: B) Valence Electrons.
Correct Answer: A) Molarity.
Correct Answer: D) Ability to rust Ability to tarnish Reactivity.