CHEMISTRY

1. The major constituent of air is

A. nitrogen

B. carbon dioxide

C. oxygen

D. hydrogen

2. The iron ore magnetite consists of

A. Fe2O3

B. Fe3OH4

C. FeCO3

D. 3Fe2O3 .. 3H2O

3. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

A. 5x/36

B. 5x

C. 7.2 x

D. x/6

4. The high reactivity of fluorine is due to

A. its high electro negativity

B. small size of fluorine atom

C. availability of d-orbitals

D. strong F - F bond

5. The main chemical constituent of clay is

A. silicon oxide

B. aluminium borosilicate

C. zeolites

D. aluminium silicate

6. The mineral containing both magnesium and calcium is

A. magnesite

B. calcite

C. carnallite

D. dolomite

ANSWERS:

1. Answer: Option A

2. Answer: Option A

3. Answer: Option A

4. Answer: Option A

5. Answer: Option D

6. Answer: Option D

SHARE

Milan Tomic

Hi. I’m Designer of Blog Magic. I’m CEO/Founder of ThemeXpose. I’m Creative Art Director, Web Designer, UI/UX Designer, Interaction Designer, Industrial Designer, Web Developer, Business Enthusiast, StartUp Enthusiast, Speaker, Writer and Photographer. Inspired to make things looks better.

• 
• 
• 
• 
•