Analysis of inorganic Substances

Which piece of laboratory equipment is typically used to measure the volume of a liquid with high precision?

• Beaker
• Graduated cylinder
• Test tube
• Burette

What is the purpose of a blank solution in spectrophotometry?

• To provide a reference to zero the instrument
• To dilute the sample
• To act as a negative control
• To increase the intensity of the colour

What is the principle behind flame tests for metal ions?

• Precipitation reactions
• Redox reactions
• Emission of light when electrons drop to lower energy levels
• Absorption of light leading to electron excitation

Which of the following reagents is commonly used to test for sulfates in solution?

• Barium chloride
• Silver nitrate
• Sodium hydroxide
• Hydrochloric acid

In gravimetric analysis, what is the purpose of drying or igniting a precipitate?

• To convert the precipitate to a more reactive form
• To remove all volatile substances and obtain a constant mass
• To dissolve the precipitate for further analysis
• To change the colour of the precipitate for identification

Which ion is typically identified using a silver nitrate test resulting in a white precipitate?

• Chloride
• Sulfate
• Nitrate
• Carbonate

What is the primary use of titration in the analysis of inorganic substances?

• To determine the concentration of a solution
• To identify unknown substances
• To measure the pH of a solution
• To observe colour changes in reactions

Which indicator is commonly used in acid-base titrations?

• Methyl orange
• Phenolphthalein
• Litmus
• Bromothymol blue

What is the colour change observed for iron(II) ions when potassium hexacyanoferrate(III) is added?

• Pale blue to dark blue
• Colourless to brown
• Green to purple
• Yellow to red

Which gas is typically evolved when dilute hydrochloric acid is added to a carbonate?

• Carbon dioxide
• Hydrogen
• Oxygen
• Chlorine