Metal Excess Defect

Q. Which of the following gives crimson red and golden yellow in flame is

1. 
2. 
3. 
4. 

Q. Why line spectrum of atoms is obtained?

Q. Alums are not formed by which alkali metal?

1. Li
2. K
3. Na
4. Cs

Q.

The apperance of colour in solid alkali metal halides is generally due to

1. Interstitial positions

2. F- center

3. Schottky defect

4. Frenkel defect