Ques. No. 9

Ques. No. 9 NCHAPTER EXERCISE Voy Short Answer Which following i' obta.ns•d J Name the 4 For 'he a reducing e-hcape• than Answer (SAJ Type I Ouestions 5 What is the purpose Of adding C) to molten iron Aluminium occurs i n combined state. Klicreas gold is found in free State in nature. Why? CBSE 7 What is the difference between sodium atom and sodium ion? 8 Why is i t that non-metals do not displace hydrogen from dilute acids? Short Answer (SAJ Type Ouesnons 9 Answer the following: (i) Name a metal which does not stick to glass. What is the nature of zinc oxide? (iii) What is deposited at the cathode. a pure or impure metal? (iv) Will carbon monoxide (CO) change the colour of blue litmus? 10 Zn is more electropositive than Fe. Therefore, it should get corroded faster than Fc, But it does not happen. Instead, it is used to galvanise iron. Explain CBSE2007 why does it happen so? II Write the equations for the reactions of (i) iron with steam (ii) calcium with water Wii) potassium with water 13 Long Answ« Type 16 An •n Name each Will be required State whiOi 01 place O' which will not. giving each? Znls» ZnSO,Wi Znso.(aq) BOTS A non-metal A which is the largest of air, when heated with H, in : 3 presence Of catalyst 'Fc' gives a gas E_ On With02, gives an oxide C. this oxadc water in the presence of air. it gives an D acts as a strong oxidising agent. •i» Identify A, B,Cand D. To which group Ot the periodic table. do non-metal belongs? Value Based Questions N'BQS 17 Noble gases. which have a completely shell, show little chemical activity. At temperature they do not show chemical However. a large number of compounds gases particularly those of xenon and kry been prepared. Read the above passage and answer questions. (i) Write One use of each At and Kr. (ii) What are the values associated helium in artificial respiration in RELATED ONLINE VIDEOS

Dear student
Solution to your asked query 9 is provided below:

(i) Mercury does not stick to a glass
(ii) Zinc oxide is basic in nature.
(iii) In general, the polarity of the cathode and anode is decided on the basis of the device used for different purposes.
In an electrolytic cell, the cathode is taken as a negative electrode while the anode is taken as a positive electrode. The two types of ions in refining are cations and anions. Cations carry pure metal while the anions carry the impurity. And since cations always possess a positive charge, therefore, they are attracted towards cathode as they are negatively charged (unlike charges attract each other) while the anions carry negative charge hence they get attracted towards the anode. Hence pure metal is always collected at the cathode.

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2] it is basic in nature since metal oxides are basic in nature
3]a pure metal is deposited at cathode
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