Q1. Write the number of covalent bonds in the molecule of Propane (C3H8)?
(Ans) Ten covalent bonds.
Q2. What is the common name of the compound CaoCl2?
(Ans.) CaOCl2 ( Bleaching powder).
Q3. Name the quantity which is same in all the resistors when they are connected in series.
(Ans) Electric current
Q4. 2g of ferrous sulphate crystals are heated in a boiling tube. State the colour of ferrous sulphate crystals both before and after heating.
(Ans) Before heating, it is pale green after heating, it is brown or reddish brown.
Q5. Why do silver articles become black when exposed to air ?
(Ans) Silver articles get tarnished by reacting with atmospheric air to form silver sulphide.
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