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X class previous year board question Chapter- Metal and non metal
VERY SHORT ANSWER QUESTIONS (1 Mark)
1. Why do silver ornaments loose their shinewhen kept for some time? [2010 (T-1)]
2. Name a metal other than aluminium that iscovered with an oxide film layer. [2010 (T-1)]
3. Name one metal and one non-metal whichexists in liquid state at room temperature?[2010
4. Name a non-metal which is lustrous and ametal which is non-lustrous. [2010 (T-1)]
5. Name two metal which have very low meltingpoint. [2010 (T-1)]
6. If copper metal is heated over a flame, itdevelops a coating. What is the colour and composition of
this coating? [2010 (T-1)]
7. Why is sodium metal kept immersed inkerosene oil? [2010 (T-1)]
8. Name one metal which react with very diluteHNO3 to evolve hydrogen gas. [2010 (T-1)]
9. A non-metal X exists in two different forms Yand Z. Y is the hardest natural substance, whereas Z is
a good conductor of electricity.Identify X, Y, and Z. [2010 (T-1)]
10. An element A form two oxides AO and AO2.The oxide AO is neutral whereas the oxide AO2 is acidic
in nature. Would you call element A a metal or non-metal. [2010 (T-1)]
11. In the refining of silver the recovery of silverfrom silver nitrate solution involves displacement by
copper metal. Give the reasonfor the same. [2010 (T-1)]
12. Name two metals which are both ductile aswell as malleable. [2005, 2006, 2010 (T-1)]
13. The reaction of iron (III) oxide Fe2O3 withaluminium is used to join cracked iron parts of
machines. [2008]
14. Give reason for the following:
(a) Ionic compounds conduct electricity inthe molten state. [2008]
15. Give reason for the following:
Metals can be given different shapes accordingto our needs. [2008]
16. How will you test for the gas which isliberated when hydrochloric acid reacts withan active metal?
[2008]
17. Which reducing agent is used in the reductionof alumina? [2007]
18. What are metalloids? [20
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