Question 45
Complete the following crossword puzzle (Fig, 3.1) by using the name of the chemical elements. Use the data given in Table 3.2.

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Question 46
(a) In this crossword puzzle (Fig 3.2), names of 11 elements are hidden Symbols of these are given below. Complete the puzzle

1. CI 7. He

2. H 8. F

3. Ar 9. Kr

4. O 10. Rn

5. Xe 11. Ne

6. N

(b) Identify the total number of inert gases, their names and symbols from this crossword puzzle

Question 46
(a) In this crossword puzzle (Fig 3.2), names of 11 elements are hidden Symbols of these are given below. Complete the puzzle

1. CI 7. He

2. H 8. F

3. Ar 9. Kr

4. O 10. Rn

5. Xe 11. Ne

6. N

(b) Identify the total number of inert gases, their names and symbols from this crossword puzzle

Q. Complete the puzzle using the feminine form of the words given.

Which among the following chemical characteristics of elements was used by Mendeleev for giving the classification of his periodic table?

Question 32
Complete the crossword puzzle with the help of clues given below:

Across
1.Pollutant which was used in refrigerators and air conditioners. (18)
3.Produced on incomplete combustion of fuels (14)
6.This chemical protects our crops and is washed into water bodies from the field. (9)
Down
2.This layer protects us from harmful ultraviolet rays. (5)
4.1t is essential for combustion. (6)
5.Disease which is caused by drinking contaminated water. (7)
7. River which is famous in India and sustains most of the northern, central and eastern Indian population. (5)

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Question 45 Complete the following crossword puzzle (Fig, 3.1) by using the name of the chemical elements. Use the data given in Table 3.2.

Question 45
Complete the following crossword puzzle (Fig, 3.1) by using the name of the chemical elements. Use the data given in Table 3.2.