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 oxides? Give two examples of amphoteric oxides. Exercise:6 NCERT Solutions SOLUTION
An amphoteric compound is a molecule or ion that can react both as an acid as well as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation state of the oxide. 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 hydrogen from dilute acids, 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 silver are the metals which will not displace hydrogen. Just VISIT! Link in the Description & in the Pinned Comment
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