Which of the following gases is heavier than oxygen?
[A] Ammonia
[B] Methane
[C] Helium
[D] Carbon dioxide

Which of the following is the process of loosing electrons?
[A] reduction
[B] oxidation
[C] both oxidation and reduction
[D] radiation

Most liquids that conduct electricity are solutions of acids, base and which of the following?
[A] Aluminium
[B] Copper
[C] Iron
[D] Salts

Which does the gas turn lime water milky?
[A] Oxygen
[B] Hydrogen
[C] Carbon Dioxide
[D] Carbon Monoxide

Due to which of the following acids, Milk tastes sour when kept in the open for sometime?
[A] Lactic Acid
[B] Citric Acid
[C] Acetic Acid
[D] Carbonic Acid

Which two elements are combined to form candles?
[A] Paraffin Wax and Stearic Acid
[B] Bees Wax and Stearic Acid
[C] Higher Fat Acids and Stearic Acid
[D] Bees Wax and Paraffin Wax

Which one of the following forms the chief constituent of Vinegar?
[A] Formic acid
[B] Acetic acid
[C] Salicylic acid
[D] Oxalic acid

Which particle is the most essential component to continue the chain reaction during the uranium fission?
[A] Electron
[B] Proton
[C] Neutron
[D] Positron

What kind of fertilizer is Urea?
[A] Sodium fertilizer
[B] Phosphatic fertilizer
[C] Nitrogenous fertilizer
[D] Potassium fertilizer

Which of the following is a physical change?
[A] Oxidation
[B] Reduction
[C] Sublimation
[D] Decomposition

The nucleus of an atom consists of which of the following?
[A] Electrons and Neutrons
[B] Electrons and Protons
[C] Protons and Neutrons
[D] All of the above