| 1 |
The smallest collection of ions in an ionic compound is called. |
- A. Formula unit
- B. Chemical formula
- C. Formula mass
- D. Molecular formula
|
| 2 |
If the empirical formula of compound is CH2 and its molecular mass is 56 than what is the actual molecular formula of this compound. |
- A. CH2
- B. C2H4
- C. C3H6
- D. C4H8
|
| 3 |
The ration of number of molecules of 2 g H2 g to number of molecules of 64 g gaseous oxygen is. |
- A. 1:1
- B. 1:2
- C. 1:32
- D. 1:4
|
| 4 |
How many moles of water results by burning 4 mole of H2 with excess of oxygen. |
- A. 1 mol
- B. 2 mol
- C. 3 mol
- D. 4 mol
|
| 5 |
How many moles of CO are present having 12.04 x 10<sup>23</sup>molecules of CO2. |
- A. 0.5 mol
- B. 1.0 mol
- C. 1,5 mol
- D. 2.0 mol
|
| 6 |
Chlorine atom and chloride ions. |
- A. Are chemically identical
- B. Are allotropes of chlroin
- C. Have same number of electrons
- D. Have same number of protons
|
| 7 |
Which of the following compound has the highest % o f oxygen by weight |
- A. CH<sub>3</sub>- OH
- B. C<sub>2</sub>H<sub>5</sub>OH
- C. HCOOH
- D. H<sub>2</sub>O
|
| 8 |
The number of moles of hydrogen atoms in 3.2 g of methane CH4. |
- A. 0.2
- B. 0.4
- C. 0.6
- D. 0.8
|
| 9 |
Tin has Isotopes |
|
| 10 |
Haemoglobin is a Macro molecule and consists of approximately atoms. |
- A. 5000
- B. 10,000
- C. 68000
- D. 15000
|