Chemistry Past Questions And Answers
1611
Which of the following statement is an exception in the assumptions of the kinetic theory of gases?
- A) The particles are of negligible size
- B) the particles are in constant random motion
- C) the particles are of negligible mass
- D) the particles collide with each other
1612
Which of the following is a example of a chemical change?
- A. Dissoultion of salt in water
- B. Rusting of iron
- C. Melting of ice
- D. Separating a mixture by distillation
1613
Fats are classified as
- A. hydrocarbons
- B. alkanoates
- C. alkanols
- D. carbohydrates
1614
Copy and complete the following table
| Element | Number of Neutrons | Electronic Configuration | Group in the periodic Table |
| \(^{23}_{11}Na\) | --- | 1s\(^{2}\)2s\(^{2}\)2p\(^{6}\)3s\(^{1}\) | 1 |
| \(^4_2He\) | 2 | ---- | --- |
| ---- | 7 | 1s\(^{2}\)2s\(^{2}\)2p\(^{2}\) | ---- |
1615
Which of the following sources of energy contributes to green-house effect?
- A. Natural gas
- B. Nuclear
- C. Wind
- D. Solar
1616
Which of the following pairs of compounds would form a precipitate when their aqueous solutions are mixed?
- A. NaCl and KNO3
- B. KCL and NaNO3
- C. K2SO4 and BaCl2
- D. NH4NO3 and CO3
1617
Zinc and carbon rods are used as anode and cathode respectively in a
- A. Leclanche cell
- B. lead accumulator
- C. Daniel cell
- D. voltaic cell
1618
The separation of petroleum fractions depends on the differences in their
- A. melting points
- B. molar masses
- C. solubilities
- D. boiling points
1619
A consequence of global warming is
- A. air pollution
- B. High Humidity
- C. flooding
- D. Water pollution
1620
Water for town supply is chlorinate to make it free from
- A) bad colour
- B) bacteria
- C) temporary hardness
- D) permanent hardness