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Monday, 14 September 2015

METALS AND NON – METALS test1

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METALS AND NON – METALS
FORMATIVE ASSESSMENT I

MARKS-30 
Instructions:
 Questions : 1 to 5 – 1 Mark each
 Questions : 6 to 9 – 2 Marks each
 Questions : 10 to 13 – 3 Marks each
 Question 14 – 5 Marks

1) Which metal other than mercury is liquid at room temperature?

2) Why the item made of silver turns black when exposed to air?

3) Which non – metal is lustrous?

4) What is an amalgam?

5) What is the nature of oxides of metal?

6) Give reasons for the following:
a) Na, K and Ca metals form hydrides by combination with hydrogen gas, but most other
metals do not.
b) Metals conduct electricity.

7) Write the equations for the reactions of:
a) Iron with steam.
b) Calcium and potassium with water.

8) What is activity series? How does it help us in predicting the relative reactivities of various metals?

9) What is the difference between sodium atom and sodium ion?

10)
a) Write electron dot structure for sodium and oxygen.
b) Show the formation of Na2O by electron transfer.
c) What are the ions present in these compounds?

11) Write three properties of ionic compounds.

12) Explain how a metal low in the activity series can be extracted. Write suitable example.

13) Give reasons:
a) Platinum, gold and silver are used to make jewellery.
b) Sodium, potassium and lithium are stored under oil.
c) Aluminium is a highly reactive metal; still it is used to make utensils for cooking.

14) Name the following:
a) A non – metal that is a good conductor of electricity.
b) A metallic oxide which can not be reduced by coke.
c) A metallic oxide which is amphoteric in nature.
d) A non – metallic oxide which is neutral.
e) Principal ore of aluminium.




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