Question 1: Which of the following property is generally not shown by metals?
Explanation: Metals have a typical shine, known as metallic lustre.
Question 2: The ability of metals to be drawn into thin wire is known as
Question 3: Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
Explanation: Electrical conductivity has no role to play in heating of a cooking utensil. Malleability, rather than ductility is required to make thin sheet of metal. So, options (ii) and (iii) are easily ruled out.
Question 4: Which one of the following metals does not react with cold as well as hot water?
Explanation: Iron reacts with steam but not with hot or cold water.
Question 5: Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
Explanation: Refer to equation given in explanation of previous question.
Question 6: What happens when calcium is treated with water?
Explanation: Calcium hydroxide and hydrogen gas are formed when calcium reacts with water. This reaction is not as violent as reaction of sodium with water.
Ca + 2H2O → Ca(OH)2 + H2
Question 7: Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
Explanation: When nitric acid reacts with metal it does not produce hydrogen gas. Nitric acid is a strong oxidizing agent and hence it oxidizes the hydrogen gas to form water. Nitric acid itself gets reduced to form oxide of nitrogen (N2O, NO, NO2).
Question 8: The composition of aqua-regia is
Question 9: Which of the following are not ionic compounds?
Explanation: These are covalent compounds.
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