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?

Ans:-Acidic

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