21. In which group of modern periodic table is halogen placed?
22. Water softner is
23. Consider the following statements
1. Dry ice is the solid form of CO2.
2. Dry ice is used primarily as a cooling agent.
3. Water ice is colder than dry ice.
Which of the statement(s) given above is/are correct?
1. Dry ice is the solid form of CO2.
2. Dry ice is used primarily as a cooling agent.
3. Water ice is colder than dry ice.
Which of the statement(s) given above is/are correct?
24. Name the reddish brown gas emitted when vigorously heating lead nitrate.
25. The ionization potential of noble gas is-
26. Diamonds can be synthesized by subjecting pure carbon to:
27. Which gas is known as 'noble gas'?
28. How is carbon black obtained?
29. Match List I with List II.
List-I
List-II
a. Hydrofluoric acid
1. Etching of glass
b. I2 dissolved in alcohol
2. Antiseptic
c. Chlorine
3. Disinfectant
d. Polyvinyl chloride
4. Plastic
| List-I | List-II |
| a. Hydrofluoric acid | 1. Etching of glass |
| b. I2 dissolved in alcohol | 2. Antiseptic |
| c. Chlorine | 3. Disinfectant |
| d. Polyvinyl chloride | 4. Plastic |
30. Following statements are made in connection with Carbon dioxide (CO2).
1. CO2 is a poisonous gas.
2. CO2 is an acidic oxide.
3. CO2 turns lime water milky.
Which of the statement(s) given above is/are correct?
1. CO2 is a poisonous gas.
2. CO2 is an acidic oxide.
3. CO2 turns lime water milky.
Which of the statement(s) given above is/are correct?
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