Question 19: Generally, non-metals are not lustrous. Which of the following nonmetal is lustrous?
Question 20: Which one of the following four metals would be displaced from the solution of its salts by other three metals?
Explanation: In the reactivity series of metals, silver is at the bottom among given four metals.
Question 21: 2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
Explanation: A mixture of HCl and HNO3 in 3:1 ratio is called Aqua regia, which dissolves gold and silver.
Question 22: An alloy is
Question 23: An electrolytic cell consists of
Question 24: During electrolytic refining of zinc, it gets
Question 25: An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following
Question 26: Alloys are homogeneous mixtures of a metal with a metal or nonmetal. Which among the following alloys contain non-metal as one of its constituents?
Explanation: Steel is a mixture of iron (metal) and carbon (non-metal). Brass is a mixture of copper and zinc. Bronze is a mixture of copper and tin. Amalgam is a mixture of mercury and any other metal.
Question 27: Which among the following statements is incorrect for magnesium metal?
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