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

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Solution

(a) The names of these elements are given as follows:
1. Cl - Chlorine 7. He - helium
2. H - Hydrogen 8. F - Fluorine
3. Ar - Argon 9. Kr - Krypton
4. O - Oxygen 10. Rn - Radon
5. Xe - Xenon 11. Ne - Neon
6. N - Nitrogen

(b) Total number of inert gases in this crossword puzzle is 6. Their names and symbols are as follows
$\begin{matrix} S . N o & N a m e o f g a s & S y m b o l 1. & H e l i u m & h e 2. & N e o n & N e 3. & A r g o n & A r 4. & K r y p t o n & K r 5. & X e n o n & X e 6. & R a d o n & R n \end{matrix}$

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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

Q. 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.

Q. Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words.
(D) 1 : Thorough washing
2 : Animal fibre
3 : Long thread like structure
Across
(A) 1 : Keeps warm
2 : Its leaves are eaten by silkworms
3 : Hatches from egg of moth

Make a crossword puzzle on real numbers.

Question 10
Complete the crossword puzzle using the hints given below.
Across
1. The process of the fusion of the gametes.
6. The type of fertilization in hen.
7. The term used for bulges observed on the sides of the body of Hydra.
8. Eggs are produced here.
Down
2. Sperms are produced in these male reproductive organs.
3. Another term for the fertilized egg.
4. These animals lay eggs.
5. A type of fission in amoeba.

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Modern Periodic Table

Standard XII Chemistry

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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