| 1 |
The largest number of molecules are present in |
- A. 3.6 of H2O
- B. 4.6 g of C2H5OH
- C. 2.8 g of CO
- D. 5.4 g of N2O5
|
| 2 |
A glass is full of water and contains 6.02 x 10<sup>23</sup>molecules of H2O The mass of water molecules is. |
- A. 18 gm
- B. 90 g
- C. 120 g
- D. 180 g
|
| 3 |
Which statement about a molecule is incorrect. |
- A. It exist independently
- B. Molecules of a substances are similar
- C. Hemoglobin is a homoatomic molecules
- D. Oxygen molecule is a macromolecule
|
| 4 |
How many atoms are present in half mol of oxygen gas. Gas exist in diatomic state. |
- A. 3.01 x 10<sup>23</sup>
- B. 6.02 x 10<sup>23</sup>
- C. 2 x 10<sup>23</sup>
- D. 1.003 x 10<sup>23</sup>
|
| 5 |
The mass of one mole of electrons is |
- A. 1.008 mg
- B. 0.55 mg
- C. 0.184 mg
- D. 1.673 mg
|
| 6 |
Tin has isotopes. |
|
| 7 |
The number of moles of CO<sub>2</sub>which contain 8.0 g of oxygen |
- A. 0.25
- B. 0.50
- C. 1.0
- D. 1.50
|
| 8 |
A limiting reactant is one. |
- A. Which is present in least amount
- B. Which produces minimum number of moles of product
- C. Which produces maximum number of moles product
- D. Does not effect the amount of product.
|
| 9 |
During combustion analysis, CO2 produced is absorbed in |
- A. Mg (CLO4)2
- B. 50% KOH
- C. CaCl2
- D. P2O5
|
| 10 |
In mass spectrometry, ions are separated on the basis of. |
- A. Masses only
- B. Charge only
- C. Change to mass ratio
- D. Mass to charge ratio
|