Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below.
(a) What will be the action of gas on
(i) dry litmus paper?
(ii) moist litmus paper?
(b) Write a balanced chemical equation for the reaction taking place.
(a) (i) No change will be on dry Litmus paper.
(ii) The gas is sulphur dioxide (SO2), which turns moist blue litmus paper to red because sulphur dioxide reacts with moisture to form sulphurous acid.
(b) S(s) + O2(g) → SO2(g)
Sodium dioxide
SO2(g) + H2O(f) → H2SO3(aq)
Sulphurous acid
Match the words of Column (A) with that of Column (B)
| Column (A) | Column (B) |
|---|---|
|
(a) Phloem |
(i) Excretion |
Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.
| Material medium |
Refractive index |
Material medium |
Refractive index |
| Air | 1.0003 | Canada Balsam |
1.53 |
| Ice | 1.31 | ||
| Water | 1.33 | Rock salt | 1.54 |
| Alcohol | 1.36 | ||
| Kerosene | 1.44 | Carbon disulphide |
1.63 |
| Fused quartz |
1.46 | ||
| Turpentine oil |
1.47 | Ruby | 1.71 |
| Benzene | 1.50 | Sapphire | 1.77 |
| Crown glass |
1.52 | Diamond | 2.42 |
Table 10.3 Absolute refractive index of some material media
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Welcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 6 , Question 9: Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a....
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