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प्रश्न
Limestone contains ______ mainly.
पर्याय
calcium chloride
Calcium carbonate
calcium nitrate
calcium sulphate
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उत्तर
Limestone contains Calcium carbonate mainly.
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संबंधित प्रश्न
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
MATCH THE COLUMNS
| 1 . `H_2` + `CI_2` `→` 2HCI | a. displacement reaction |
| 2. `2FeCI_3`+ `H_2` `→` `2FeCI_2` +2HCI` | b. addition of an electronegative redical |
| 3. Fe + `CuSO_4` `→``FeSO_4` +Cu` | c. removal of an electronegative redical |
| 4. `2H_2O` +`4NO_2`+`O_2` `→` `4HNO_3` | d.reduction by adding hydrogen |
| 5. 3Fe +`3CI_2` `→` `2FeCI_3` | e.electrolysis of water |
| 6. `FeCI_3`+ 3NaOH `→``Fe(OH)_3``↓`+NaCI | F.double decomposition,precipitation reaction |
| 7.`2H_2O` `→` `2H_2``↑`+`O_2` | e. combination or synthesis reaction |
Write a short note on the information derived from a balanced chemical equation.
Define an electrochemical reaction.
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
Name: Two carbonates do not produce carbon dioxide on heating.
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Which of the following is/are true when milk changes into curd?
- Its state is changed from liquid to semi solid.
- It changes colour.
- It changes taste.
- The change cannot be reversed.
Choose the correct option from below:
When magnesium is burnt in the air, a new substance is formed which is ______.
