CBSE Class 10 Science 2019 Delhi Set 1

Question : 22

Total: 28

Blue litmus solution is added to two test tubes A and B containing dilute HCl and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.
OR
What is observed when 2‌mL of dilute hydrochloric acid is added to 1g of sodium carbonate taken in a clean and dry test tube? Write chemical equation for the reaction involved.

Solution:

Test tube A will show colour change because acids turn blue litmus to red. So the final colour of test tube would be red.
OR
A brisk effervescence would be observed if HCl is added to Na2CO3 due to the evolution of CO2 gas.
Na2CO3+HCl→NaCl+H2O+CO2

Go to Question:

Prev Question

Next Question