Explain the different products formed during
electrolysis of sodium chloride (NaCl) in solution & in fused state.
State two properties of bleaching powder.
Ans.
i) Electrolysis of aqueous solution of NaCl
when electricity is passed through an aqueous
solution of sodium chloride commonly known an brine (10% NaCl), it decomposes
to form sodium hydroxide. Chlorine (Cl2) gas is liberated at anode
& hydrogen (H2) gas at cathode respectively.
2NaCl
+ 2H2O -------> 2NaoH + C2 + H2
ii)
Electrolysis of fused sodium chloride : When sodium chloride is heated at high
temperature, it melts. The moten state is termed as fused state. NaCl in fused
state conducts electricity. During electrolysis Cl2 (g) is liberated
at anode & sodium is deposited at the cathode.
2NaCl -------> 2Na + Cl2
Give the properties of NaCl with its uses.
Ans.
Properties of NaCl.
i)
Impure NaCl is brown in colour known as rock salt & purified NaCl is white
(colourless), crystalline ionic compound.
ii)
It is soluble in water.
Uses of NaCl.
i)
NaCl is an essential constituent of our daily life. It is used in food items.
ii)
It is used in the preparation of baking soda (NaHCO3) & washing
soda (Na2CO3).
State applications of baking soda [(NaHCO3)
sodium bicarbonate]
Ans.
i) Baking soda also called as sodium
bicarbonate, has many appliances.
ii)
It is used in the preparation of light, soft & spongy breads, cakes & dhokla.
iii)
It is used to treat slightly alkaline hyperactivity, i.e. acidity in the stomoch.
iv)
Its solution is used in fire, extinguishers to produce carbon dioxide &
water.
How bleaching powder is prepared?
Ans.
When dry slaked lime reacts with chlorine
gas, it gives bleaching powder.
Ca(OH)2 + Cl2 -------> CaOCl2 + H2O
Slaked lime chlorine Bleaching
powder
State two properties of bleaching powder.
Ans. i) Bleaching powder is a white powder with
strong odour of chlorine gas.
ii) It is an
oxidizing agent in many chemical reactions.
Give uses of bleaching powder (CaOCl2)
Ans. i) Bleaching powder (CaOCl2) is used
to disinfect a place which is not clean.
ii) It is also
used to disinfeet water.
iii) It is used for
bleaching cotton in the textile industry, wood pulp in paper factories &
washed clothes in laundry.
iv) It is used
in the preparation of chloroform.
Chemical reactions, Chemical reaction, iron nail &
burning candle, Iron, Ferrous chloride, Hydrogen gas, sodium hydroxide, aluminium
ribbon, Slaked lime, bleaching powder, Bleaching powder, Calcium carbonate, Chlorine,
Sodium carbonate, Sodium chloride, carbon dioxide universal indicator,
hydrogen, PH, ion, Magnesium ribbon, Magnesium chloride, sodium carbonate, sodium
chloride, Aluminum carbonate, Aluminium chloride, sodium bicarbonate, sodium
chloride Copper oxide (basic oxide) Hydrochloride acid copper chloride salt The
Acid Base Chemistry, Acids and Bases, Indicators, Strength of Acids & Bases, Acids, Bases & their reactivity, Ionization of Acids and Bases, Salts.Slaked
lime, chlorine, Bleaching powder, baking soda, washing soda, sodium bicarbonate
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