NCERT Solutions Pg No.: 56 Q1.. You are given a hammer, a battery, a bulb, wires and a switch. Exercise:5

a) How could you use them to distinguish between samples of metals and non-metals?

(b) Assess the usefulness of these tests in distinguishing between metals and non-metals. NCERT Solutions SOLUTION

(a) If the substance can be hammered to convert into sheets then it is metal if it is broken into pieces then it is non-metal. Set up the arrangement using bulb, battery, wire and switch as shown in figure. Place the substance between Point A and B if the bulb starts glowing then the substance is a Metal otherwise it is non-metal because metals are good conductor of electricity. (b) Generally above methods can be used to identify metals and non-metals. But there are some exceptions also for example Sodium is metal which is not malleable in fact it is brittle. Graphite allotrope of non-metal carbon is a good conductor of electricity. NCERT Solutions Pg No.: 56 Q 2. What are amphoteric ? Give two examples of amphoteric oxides. Exercise:6 NCERT Solutions SOLUTION

An amphoteric compound is a molecule or that can react both as an as well as a . Many metals (such as , , , , , and ) form amphoteric oxides or . Amphoterism depends on the of the . NCERT Solutions SOLUTION

ZnO(s) + 2HCl(aq) → ZnCl2(aq) + H2O(l)

ZnO(s) + 2NaOH(a) → Na2ZnO2(aq) + H2O(l)

Al2O3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2O(l)

Al2O3(s) + 2NaOH(aq) → 2NaAlO2(aq) + H2O(l) NCERT Solutions Pg No.: 56 Q 3 Name two metals which will displace from dilute , and two metals which will not. Exercise:7 NCERT Solutions SOLUTION

aluminium, and magnesium, or any other metal placed above hydrogen can be considered as an example of the metals that displace hydrogen from dilute acids; and mercury, and are the metals which will not displace hydrogen. Just VISIT! Link in the Description & in the Pinned Comment

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