Chemistry Past Questions and Answers

In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?

A In the beaker
B In the conical flask
C In a burette
D In the standard flask
E In the measuring cylinder

Question 102:

A gas jar was inverted over burning yellow phosphorus floating over water in a beaker. After burning, the water level was found to rise in the gas jar. The water level rises because

A Pressure inside the gas jar is greater than pressure outside it
B The air in the gas jar had been used up by burning
C Oxygen in the gas jar had been used up by burning
D Nitrogen in the gas jar had been used up by burning
E The temperature in the jar had risen considerably

Question 103:

You are provided with five gas jars containing SO2, CO2, H2, CO and NO respectively. Select a test from A to E which will identify ANY ONE of the gases completely

A Pass each gas into lime water
B Pass each gas into water and test with litmus paper
C Pass each gas into concentrated sulphuric acid
D Expose each gas to atmospheric air
E Expose each gas to fumes of hydrogen chloride

Question 104:

Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?

A Litmus paper
B Phenolphthalein
C Methyl orange
D Universal indicator
E None of these

Question 105:

Which of the five atoms can be described by the following properties: Relative atomic mass is greater than 30 but less than 40, it has odd atomic number and forms a unipositive ion in solution?