Which one of the following is the most characteristic property of an element?
Atomic number is the fundamental properties of an element. Every atom is identified by its unique atomic number. Atomic number is equal to the number of protons present in an atom of the element.
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Which is not a green house gas in the following?
What enables an electric current to flow in a circuit?
Which of the following statement(s) is/are CORRECT?
I. Bases are soapy to touch.
II. Bases generate OH– ions.
III. Metal oxides dissolve in water to form Acidic solution.
Which of the following statements are CORRECT?
I. Melamine is a Thermo setting plastic.
II. It resists fire.
III It is a poor conductor of heat.
Match the following items of column A with column B.
Metals are generally ______.
I. Ductile
II. Malleable
III. Poor conductors of heat
By volume, 21% of air is _______________.
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