Question

1. Arrange the following metals in the decreasing order of chemical reactivity; placing the most active first. Cu, Mg, Fe, Na, Ca, Zn.
2. Name two metals which can displace hydrogen from dilute HCI.
3. Name the metal which occurs below copper in the reactivity series. Also name the metal that lies just above hydrogen in the reactivity series.
4. An element X on reacting with oxygen forms an oxide X2O. this oxide dissolves in water and turns blue litmus red.
5. If an iron nail is left in a filled bottle of boiled water how long will it take to corrode?
6. Give reason-
a.Bells used in temples are made of metals not wood .
b.Gold and silver are used for making jewellery.
c. Phosphorus kept stored in water.
7. Which gas is produced when sodium added to water?
8. Write the chemical reaction when zinc reacts with dilute H2SO4.
9. Complete the reactions-
1. S +O2----------------_______
2. SO2 + --------- _---------------H2SO3
3. CuSO4 + Zn--------------------- ------------ + Cu
4. CO2 +Ca(OH)2-----------------------------
5. K + O2--------------- ----------------
6. Mg + O2------------------- ----------------
7. Metals + H2O--------------- ______________ + H2

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

1. Na>Ca>Mg>Zn>Fe>Cu

2. Magnesium and Aluminum

3.Mercury

4.Na

5.No

6.a. Because metals have the capability to produce sound when hit with a solid object, i.e, they are Sonorous. Wood is not sonorous as it is a non-metal

b. Platinum Gold and silver are used to make jewellery because of the following reasons.

They are highly lustrous metals which are resistant to corrosion.

They are highly malleable and ductile so can be transformed into any shape or design

c. White Phosphorus is stored under water and not kerosene. It is kept submerged in water because it is a highly reactive metal and when it is exposed to air it autoignition as its ignition temperature is low.

When exposed to air, it is oxidized rapidly to phosphorus pentoxide.

7.The reaction of sodium and water produces hydrogen gas and heat, which is not a good combination! Sodium must be stored under mineral oil, or some other high-molecular weight hydrocarbon.

8.Zn+2H2SO4(dil)→ZnSO4+2H2.

Zinc (Zn): 1

Explanation:

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