Lakshyank has 44 Acids, Bases and Salts questions for CBSE X. Try a few below, then practise the rest free.
Sodium hydrogen carbonate reacts with acetic acid to evolve a gas. Which properties are true? (i) Turns limewater milky; (ii) extinguishes a burning splinter; (iii) reacts with and is absorbed by sodium hydroxide solution; (iv) has a pungent odour.
Correct!
The answer is C, (i),(ii),(iii).
NaCl+NH₃+CO₂+H₂O produces X and Y. Heating X gives Z,which can be hydrated to washing soda. Identify Y and Z.
Correct!
The answer is C, NH₄Cl and Na₂CO₃.
Which sodium-carbonate compound is used to remove permanent hardness of water?
Correct!
The answer is B, Washing soda, Na₂CO₃·10H₂O.
Which school-level equation represents chlorine reacting with dry slaked lime near 313 K?
Correct!
The answer is D, Ca(OH)₂+Cl₂→CaOCl₂+H₂O.
What balanced equation represents dilute HCl reacting with sodium hydroxide?
Correct!
The answer is B, HCl+NaOH→NaCl+H₂O.
How can baking soda yield sodium carbonate, and what forms on crystallisation of the carbonate solution under the usual school conditions?
Correct!
The answer is A, 2NaHCO₃→Na₂CO₃+CO₂+H₂O; crystals of Na₂CO₃·10H₂O.
What is the process of lowering an acid’s concentration by adding water called?
Correct!
The answer is A, Dilution.
How can a generally basic toothpaste help protect teeth from acid damage?
Correct!
The answer is B, Help neutralise acids produced by bacteria.
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