CBSE Class 10 Science 2020 · Paper 31/3/1 · Question 16(a)

Acids, Bases and Salts 3 marks Medium

Complete and balance the following chemical equations :

Answer

The products are sodium zincate with hydrogen, calcium hydrogencarbonate, and hydronium with chloride ions.

(i)

2 NaOH_{(aq)} + Zn_{(s)} \to Na_{2} ZnO_{2 (aq)} + H_{2 (g)}

(sodium zincate and hydrogen gas) (ii)

CaCO_{3 (s)} + H_{2} O_{(l)} + CO_{2 (g)} \to Ca(HCO_{3})_{2 (aq)}

(calcium hydrogencarbonate, soluble in water) (iii)

HCl_{(aq)} + H_{2} O_{(l)} \to H_{3} O_{(aq)}^{+} + Cl_{(aq)}^{-}

(hydronium ion and chloride ion)

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