Wednesday, July 13, 2011

CBSE Chemistry X- Ch: Metal and non Metal:Important guess very short type Questions answer solved

1 marks questions (very short answer type question)
Q.1:- Name a metal which can be cut with a knife?
Ans:- sodium
Q.2:- hich metal is the best conductor of electricity?
Ans:- silver
Q.3 Which metal is poorest conductor of electricity?
Ans:- iron
Q.4 Which metal is most ductile?
Ans.:- gold
Q.5 Which metal is best conductor of heat ?
ans:- silver(and copper)
Q.6:- Which metal other than mercury is liquid at room temperature? 
Ans:- Gallium
Q.7:- Which metal is poorest conductor of heat?
Ans:- lead (and mercury)
Q.8:- What is the nature of oxides of metal?
Ans:- Basic
Q.9:- What is the nature of oxides of non- metal?
Q10:-Which non-metal conduct electricity?
Ans:-Graphite, allotrope of carbon conduct electricity.
Q.11:- Which non-metal is lusturous?
Ans:- iodine
Q.12:- Why metals are hard and have high melting point?
Ans:- because of their crystalline structure metals are hard.
Q.13:- What is an amalgam? Ans:- An alloy of two metals in which one is mercury is called amalgam.
Q.14:- What are the constituents of solder?
Ans:- tin and lead
Q.15:- Name the green coloured compound which appears on the surface of copper utensils?
Ans:- Basic copper carbonate
Q.16:- Why the item made of silver turns black when exposed to air?
Ans:- due to formation of silver sulphide
Q.17:- What are amphoteric oxides? Give an example.
Ans:- Oxides which react with both acids as well as bases to produce salt and water are called amphoteric oxides .for example:- Al2O3 . ZnO
Q.18:- Why sodium is kept immersed in kerosene oil?
Ans:- because sodium react with air to form Na2O (sodium oxide).
Q.19:- Which gas is produced when dil. HCl is added to a reactive metal? Write the chemical reaction when iron reacts with dil. H2SO4?
Ans:- hydrogen gas is produce when dil. HCl is added to a reactive metal.
Fe(s) + H2SO4(dil.) ------> FeSO4(aq) +H2(g)
Q.20:- Why metals like potassium and sodium catch fire when treated with water? 
Ans:- The reaction between sodium and water is so violent that the H2 gas released catches fire .Reaction:- 2Na(s) + 2H2O(l) ----------> 2NaOH(aq) + H2(s) + heat energy

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