HARD
10th CBSE
IMPORTANT
Earn 100

A student takes about 2 mL ethanoic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He reports the following observations:
I. Immediately a colourless and odourless gas evolves with a brisk effervescence.
II. The gas turns lime water milky when passed through it.
III. The gas burns with an explosion when a burning splinter is brought near it.
IV. The gas extinguishes the burning splinter that is brought near it.
The correct observations are:

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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 56
In an experiment to study the properties of ethanoic acid, a student takes about 3 mL of ethanoic acid in a dry test tube. He adds an equal amount of distilled water to it and shakes the test tube well. After some time he is likely to observe that:
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 57
A student prepared 20% sodium hydroxide solution in a breaker to study saponification reaction. Some observations related to this are given below:
(i) Sodium hydroxide solution turns red litmus blue.
(ii) Sodium hydroxide readily dissolves in water.
(iii) The beaker containing solution appears cold when touched from outside.
(iv) The blue litmus paper turns red when dipped into the solution.
The correct observations are:
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 58
In order to study saponification reaction, we first prepare 20% solution of sodium hydroxide. If we record the temperature of this solution just after adding sodium hydroxide flakes to water and also test its nature using litmus, it may be concluded that the process of making this solution is:
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 59
A student takes about 4 mL of distilled water in four test tubes marked P, Q, R and S. He then dissolves in each test tube an equal amount of one salt in one test tube, namely sodium sulphate in P, Potassium sulphate in Q, calcium sulphate in R and magnesium sulphate in S. After that he adds an equal amount of soap solution in each test tube. On shaking each of these test tubes well, he observes a good amount of lather (foam) in the test tubes marked:
EASY
10th CBSE
IMPORTANT
ESSENTIALS OF CHEMISTRY X>Chapter 4 - Carbon and its Compounds>Value Based Questions>Q 60
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.
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: