In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Here, we have provided case based/passage based questions for Class 10 Science Chapter 3 Metals And Non Metals.
Question 1:
Read the following and answer any four questions from (i) to (v).
On the basis of reactivity of different metals with oxygen, water and acids as well as displacement reactions, the metals have been arranged in the decreasing order of their reactivities. This arrangement is known as activity series or reactivity series of metals.
The basis of reactivity is the tendency of metals to lose electrons. If a metal can lose electrons easily to form positive ions, it will react readily with other substances. Therefore, it will be a reactive metal. On the other hand, if a meal loses electrons less rapidly to form a positive ion, it will react slowly with other substances. Therefore, such a metal will be less reactive.
(i) Which of the following metals is less reactive than hydrogen?
(a) Copper
(b) Zinc
(c) Magnesium
(d) Lead
Answer
Answer: (a) Copper is placed below hydrogen in activity series therefore, it is less reactive than hydrogen.(ii) Which of the following metals is more reactive than hydrogen?
(a) Mercury
(b) Platinum
(c) Iron
(d) Gold
Answer
Answer: (c) Iron is placed above hydrogen in activity series therefore, it is more reactive than hydrogen.(iii) Which of the following metals reacts vigorously with oxygen?
(a) Zinc
(b) Magnesium
(c) Sodium
(d) Copper
Answer
Answer: (c)(iv) Which of the following represents the correct order of reactivity for the given metals?
(a) Na > Mg > Al > Cu
(b) Mg > Na > Al > Cu
(c) Na > Mg > Cu > Al
(d) Mg > Al > Na > Cu
Answer
Answer: (a)(v) Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because HNO, is a strong oxidising agent. It oxidises the H, produced to water and itself gets reduced to any of the nitrogen oxides (N,O, NO, NO2). But _____________ and _____________ react with very dilute HNO3 to evolve H2 gas.
(a) Pb, Cu
(b) Na, K
(C) Mg, Mn
(d) Al, Zn
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