EASY
10th CBSE
IMPORTANT
Earn 100

Hard water is not available for an experiment. Some salts are given below:
(i) Sodium chloride
(ii) Sodium sulphate
(iii) Calcium chloride
(iv) Calcium sulphate
(v) Potassium chloride
(vi) Magnesium sulphate
Select from the following a group of these salts, each member of which may be dissolved in water to make it hard.

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Important Questions on Carbon and its Compounds

EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 61
What do we observe on pouring acetic acid on red and blue litmus papers?
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 62
A student puts a drop of reaction mixture of a saponification reaction first on a blue litmus paper and then on a red litmus paper. He may observe that:
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 63
In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following groups of salts available in your school, a group, each member of which, if dissolved in distilled water, will make it hard:
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 64
For preparing soap in the laboratory we require an oil and a base. Which of the following combinations of an oil and a base would be best suited for the preparation of soap?
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 65
When you add a few drops of acetic acid to a test-tube containing sodium bicarbonate, which of the following is your observation?
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 66
A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory there are some salts which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts a group each salt of which when dissolved in distilled water will make it hard:
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 67
While studying saponification reaction, what do you observe when you mix an equal amount of colourless vegetable oil and 20% aqueous solution of NaOH in a beaker?
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 68
You have four test tubes, A,B,C and D containing sodium carbonate, sodium chloride, lime water and blue litmus solutions respectively. Out of these the material of which test tube/test tubes would be suitable for the correct test of acetic/ethanoic acid?