1Why might you feel hotter on cloudy nights than on clear nights?
2What is the importance of greenhouses in our daily life? What happens if there are no greenhouses?
3What are the sources of carbon dioxide in the atmosphere?
4What difference is seen in the temperature of the air inside and outside the transparent plastic box kept in sunlight?
5What is the cause of the difference in temperature outside and inside the box?
6What would happen if acid is dropped on a leaf? Why are old monuments fading day by day, and what must be done to prevent it?
7A piece of bone is kept in hydrochloric acid for a day and then taken out. What do you find, and what is the conclusion?
8What products are formed on heating limestone to a high temperature using coal?
9How is carbon dioxide collected in the gas jar?
10Which compound is formed when carbon dioxide gas is passed through lime water for some time?
11In what ratio should ammonium chloride and calcium hydroxide be mixed for the laboratory preparation of ammonia gas?
12Give reason: carbon dioxide can be collected in an open glass jar.
13Give reason: the bottle of liquid ammonia should be placed in cold water or ice for some time before opening its lid.
14Describe the laboratory preparation of carbon dioxide with a labelled diagram.
15Dilute hydrochloric acid is poured through a thistle funnel onto marble chips in a bottle, and the gas formed is led into an upright gas jar. Which gas is being collected in the gas jar?
16Write a balanced chemical equation for the preparation of this gas (carbon dioxide from marble chips and dilute hydrochloric acid).
17Which litmus paper is used to identify carbon dioxide?
18Why is the gas jar collecting carbon dioxide kept straight upright?
19Write any three properties of carbon dioxide gas.
20Write any four uses of carbon dioxide gas.
21Describe the laboratory preparation of ammonia gas with a labelled diagram.
22A mixture of ammonium chloride and calcium hydroxide is heated in a slightly inclined hard glass test tube, and the gas is passed through a lime tower into an inverted gas jar. Which gas is being collected in the gas jar?
23Write the balanced chemical equation for the preparation of ammonia gas.
24Which litmus is used to identify ammonia gas?
25Why is the hard glass test tube slightly inclined when ammonia is prepared?
26What is the use of the lime tower?
27Write any four uses of ammonia gas.
28What happens when carbon dioxide is passed through lime water for some time? Write a balanced chemical reaction.
29What happens when carbon dioxide is passed through lime water for a long time? Write a balanced chemical reaction.
30What happens when burning magnesium is inserted into a jar full of carbon dioxide gas? Write a balanced chemical reaction.
31What happens when the mixture of ammonium chloride and calcium hydroxide is heated? Write a balanced chemical reaction.
32What happens when ammonia is mixed with water? Write a balanced chemical reaction.
33What happens when ammonia reacts with hydrochloric acid? Write a balanced chemical reaction.
34Write two differences between a natural and an artificial greenhouse.
35The greenhouse effect is both necessary and harmful for the earth. Explain how.
36How does the temperature rise inside an artificial greenhouse? Explain using short and long waves.
37What is acid rain? Write any two of its effects.
38How does the pH of ordinary rain differ from that of acid rain?