WorksheetsUntitled Quiz
Total questions: 10
Worksheet time: 5mins
What is the procedure to soften hard water using washing soda?
Add some sugar and stir
Add some salt and stir
Add some vinegar and stir
Add some soap and stir
What causes the hardness of water from a well or a bore-well?
Presence of chlorides and sulphates of sodium
Presence of chlorides and sulphates of calcium and magnesium
Presence of nitrates and phosphates of calcium and magnesium
Presence of carbonates and bicarbonates of calcium and magnesium
What is the reaction of Na2 CO3 with H2 SO4?
Na2 CO3 (s) + H2 SO4 (aq) → Na2 SO4 (s) + H2 O (l) + CO2 (g)
Na2 CO3 (s) + H2 SO4 (aq) → Na2 SO4 (aq) + H2 O (l) + CO2 (g)
Na2 CO3 (s) + H2 SO4 (aq) → Na2 SO4 (aq) + H2 CO3 (aq)
Na2 CO3 (s) + H2 SO4 (aq) → Na2 SO4 (aq) + H2 CO3 (s)
What is the color of litmus in the aqueous solution of washing soda?
Red
Blue
Green
Yellow
What is the property of washing soda that makes it absorb moisture if left exposed to air?
It is hydrothermal
It is hydrophilic
It is hydrophobic
It is hygroscopic
What is the main use of washing soda?
Washing windows
Washing dishes
Washing cars
Washing clothes
What industry uses sodium carbonate?
Textile industry
Food industry
Automobile industry
Glass and paper industry
What is the chemical formula of washing soda?
Na2 CO3 .15 H2 O
Na2 CO3 .5 H2 O
Na2 CO3 .10 H2 O
Na2 CO3 .H2 O
What is the reaction of Na2 CO3 with MgCl2?
MgCl2 (aq) + Na2 CO3 (s) → MgCO3 (aq) + 2 NaCl (s)
MgCl2 (s) + Na2 CO3 (aq) → MgCO3 (s) + 2 NaCl (aq)
MgCl2 (aq) + Na2 CO3 (s) → MgCO3 (s) + 2 NaCl (aq)
MgCl2 (s) + Na2 CO3 (aq) → MgCO3 (aq) + 2 NaCl (s)
What is the appearance of washing soda at room temperature?
Yellow powder
Blue powder
White powder
Green powder
