Science: Synthetic Fiber and Ans
(Q.)Give one example of each: metals and non-metals. (Ans)
Metals: Copper.
Non-Metals: Sulphur.
(Q.)Name the metal, which is the best conductor of heat and electricity. (Ans)
Copper.
(Q.)Name the property by virtue of which metals can be drawn into thin wires. (Ans)
Ductility.
Q.)Name the gas produced, when metals reacts with acids.
(Ans)
Hydrogen gas.
(Q.)What is the color of the copper sulphate solution?
(1 Mark)
(Ans)
Blue.
(Q.)State the nature of oxides of non-metals.
(1 Mark)
(Ans)
The oxides of non-metals are generally, basic in nature.
(Q.)Which metal is stored in kerosene?
(1 Mark)
(Ans)
Sodium.
(Q.)Name the property of the metal by which it can be drawn into thin sheets.
(1 Mark)
(Ans)
Malleability.
Q.)What happens when sulphur reacts with oxygen?
(1 Mark)
(Ans)
Sulphur di oxide is formed.
S + O2 SO2
(Q.)Which non-metal catches fire, if exposed to air?
(1 Mark)
(Ans)
Phosphorus.
(Q.)Name the gas that burns with a POP sound.
(1 Mark)
(Ans)
Hydrogen gas.
(Q.)What are displacement reactions?
(1 Mark)
(Ans)
The reactions in which more reactive metals displace less reactive metals from their compounds in aqueous solution are called displacement reaction.
(Q.)Give one use of non-metal in our daily life.
(1 Mark)
(Ans)
Chlorine gasis used in purification of water.
(Q.)What are metalloids?
(1 Mark)
(Ans)
Metalloids are those elements which possess some properties of metals and some properties of non-metals.
(Q.)Which metal is use to wrap food items?
(1 Mark)
(Ans)
Aluminium.
(Q.)What happens when sulphur di- oxide reacts with water? Give the chemical reaction involved.
(2 Marks)
(Ans)
When sulpur dioxide reacts with water, sulphurous acid is formed.
SO2 + H2O H2SO3
(Q.)Why lemon pickle cannot be stored in an aluminium foil?
(2 Marks)
(Ans)
Aluminium reacts with the citric acid present in the lemon. Hence, lemon pickles can't be
Metals: Copper.
Non-Metals: Sulphur.
(Q.)Name the metal, which is the best conductor of heat and electricity. (Ans)
Copper.
(Q.)Name the property by virtue of which metals can be drawn into thin wires. (Ans)
Ductility.
Q.)Name the gas produced, when metals reacts with acids.
(Ans)
Hydrogen gas.
(Q.)What is the color of the copper sulphate solution?
(1 Mark)
(Ans)
Blue.
(Q.)State the nature of oxides of non-metals.
(1 Mark)
(Ans)
The oxides of non-metals are generally, basic in nature.
(Q.)Which metal is stored in kerosene?
(1 Mark)
(Ans)
Sodium.
(Q.)Name the property of the metal by which it can be drawn into thin sheets.
(1 Mark)
(Ans)
Malleability.
Q.)What happens when sulphur reacts with oxygen?
(1 Mark)
(Ans)
Sulphur di oxide is formed.
S + O2 SO2
(Q.)Which non-metal catches fire, if exposed to air?
(1 Mark)
(Ans)
Phosphorus.
(Q.)Name the gas that burns with a POP sound.
(1 Mark)
(Ans)
Hydrogen gas.
(Q.)What are displacement reactions?
(1 Mark)
(Ans)
The reactions in which more reactive metals displace less reactive metals from their compounds in aqueous solution are called displacement reaction.
(Q.)Give one use of non-metal in our daily life.
(1 Mark)
(Ans)
Chlorine gasis used in purification of water.
(Q.)What are metalloids?
(1 Mark)
(Ans)
Metalloids are those elements which possess some properties of metals and some properties of non-metals.
(Q.)Which metal is use to wrap food items?
(1 Mark)
(Ans)
Aluminium.
(Q.)What happens when sulphur di- oxide reacts with water? Give the chemical reaction involved.
(2 Marks)
(Ans)
When sulpur dioxide reacts with water, sulphurous acid is formed.
SO2 + H2O H2SO3
(Q.)Why lemon pickle cannot be stored in an aluminium foil?
(2 Marks)
(Ans)
Aluminium reacts with the citric acid present in the lemon. Hence, lemon pickles can't be