Untitled Quiz

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