CBSE Class 7 Solved Objective Questions Chapter - Acids, Bases and Salts MCQs 1. The word acid comes from the Latin word ------ which means sour.( acere) 2. The substances used to test whether a substance is acidic or basic are known as ----(indicators) 3. The most commonly used natural indicator is litmus paper . It is extracted from ----(lichens) 4. In acidic solution, litmus paper turns into ------(red) 5. In basic solution, litmus paper turns into ------(blue) 6. In distilled water , litmus paper turns into ------(purple) 7. China rose indicator turns acidic solutions ------and basic solutions to ------ [dark pink (magenta) , green] 8. The reaction between an acid and a base is known as ----- [neutralization] 9. Salt and water are produced in neutralization process with the evolution of heat.[ water] 10. HCl + NaOH ----> ------- + H 2 O [NaCl] 11. Our stomach contains -------. It helps us to digest food[hydrochloric acid] 12. indigesti
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