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प्रश्न
Calcium phosphate is present in tooth enamel. Its nature is
विकल्प
basic
acidic
neutral
amphoteric
उत्तर
basic
Explanation -
Ca3(PO4)2 is a salt of strong base Ca(OH)2 and weak acid H3PO4.
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संबंधित प्रश्न
Dilute NaOH can be tested with
(a) red litmus paper
(b) blue litmus paper
(c) lime water
(d) Na2CO3
Why do HCl, HNO3, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?
Dry HCl gas does not change the colour of dry blue litmus paper. Why?
A solution reacts with marble chips to produce a gas which turns lime water milky. The solution contains:
(a) Na2SO4
(b) CaSO4
(c) H2SO4
(d) K2SO4
A substance X which is used as an antacid reacts with dilute hydrochloric acid to produce a gas Y which is used in one type of fire-extinguisher. Name the substance X and gas Y. Write a balanced equation for the chemical reaction which takes place.
Define an acid and a base. Give two examples of each.
Phenolphthalein is a synthetic type of indicator.
Acids turn blue litmus paper to ______.
What happens when a solution of an acid is mixed with a solution of a base in a test tube?
- The temperature of the solution increases
- The temperature of the solution decreases
- The temperature of the solution remains the same
- Salt formation takes place
Common salt besides being used in kitchen can also be used as the raw material for making
- washing soda
- bleaching powder
- baking soda
- slaked lime
