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Water · ICSE STD 7 (ICSE - English Medium). 14 questions.

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14 questions · timed · auto-graded

Question 11 Mark
Complete and balance the equations. $MgSO_4 + Na_2CO_3 \rightarrow $
Answer
$\underset{\text {magnesium sulphate}}{MgSO_4} + \underset{\text {sodium carbonate}}{Na_2CO_3} \rightarrow \underset{\text {magnesium carbonate}}{MgCO_3} + \underset {\text {sodium sulphate}}{Na_2SO_4}$
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Question 21 Mark
Complete and balance the equations. $CaCl_2 + Na_2CO_3 \rightarrow$
Answer
$\underset{\text {calcium chloride}}{CaCl_2} + \underset{\text {sodium carbonate}}{Na_2CO_3} \rightarrow \underset{\text {calcium carbonate}}{CaCO_3} + \underset {\text {sodium chloride}}{2NaCl}$
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Question 31 Mark
Complete and balance the equations. $Ca(HCO_3)_2$heat
Answer
$\underset{\text {calcium bicarbonate}}{Ca(HCO_3)_2} \xrightarrow {heat} \underset{\text {calcium carbonate}}{CaCO_3} + \underset{\text {water}}{H_2O} + \underset {\text {carbon dioxide}}{CO_2}$
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Question 41 Mark
Complete and balance the equations. $SO_3 + H_2O \rightarrow $
Answer
$\underset{\text {sulphur trioxide}}{SO_3} + \underset{\text {water}}{H_2O} \longrightarrow \underset{\text {sulphuric acid}}{H_2SO_4}$
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Question 51 Mark
Complete and balance the equations. $MgO + H_2O \rightarrow $
Answer
$\underset{\text {magnesium oxide}}{MgO} + \underset{\text {water}}{H_2O} \longrightarrow \underset{\text {magnesium hydroxide}}{Mg(OH)_2}$
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Question 61 Mark
Complete and balance the equations. $Na_2O + H_2O \rightarrow $
Answer
$\underset{\text {sodium oxide}}{Na_2O} + \underset{\text {water}}{H_2O} \longrightarrow \underset{\text {sodium hydroxide}}{2NaOH}$
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Question 71 Mark
Complete and balance the equations. $Na + H_2O \rightarrow $
Answer
$\underset{\text {sodium}}{2Na} + \underset{\text {water}}{2H_2O} \longrightarrow \underset{\text {sodium hydroxide}}{2NaOH} + \underset {\text {hydrogen gas}}{H_2}$
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Question 81 Mark
Complete and balance the equations. $K + 2H_2O \rightarrow $
Answer
$\underset{\text {potassium}}{2K} + \underset{\text {water}}{H_2O} \longrightarrow \underset{\text {potassium hydroxide}}{2KOH} + \underset {\text {hydrogen gas}}{H_2}$
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Question 91 Mark
Name the following.
The acid formed when sulphur trioxide reacts with water
Answer
Sulphuric acid $(H_2SO_4)$
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Question 111 Mark
Name the following.
The chemical added to kill germs during purification of water
Answer
Chlorine (bleaching powder)
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Question 141 Mark
Name the following.
The continuous circulation of water in nature
Answer
Water cycle or hydrological cycle
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