18 Questions
What is the characteristic feature of the chemical reaction between sulphuric acid and barium chloride solution?
Formation of a white precipitate of barium sulphate
When colourless solutions of lead nitrate and potassium iodide are mixed, what is formed?
A yellow precipitate of lead iodide
What happens to the color of the potassium permanganate solution when it reacts with citric acid?
The color changes from purple to colourless
Which of the following is NOT a characteristic feature of a chemical reaction?
Increase in temperature of the reaction
What type of gas is produced in a chemical reaction?
Hydrogen gas
Which of the following is a characteristic feature of precipitation in a chemical reaction?
Formation of an insoluble product
Which gas is produced when zinc granules react with dilute sulphuric acid?
Hydrogen gas
What happens to the temperature during the reaction of zinc granules with dilute sulphuric acid?
The temperature increases
Which of the following gases is evolved when magnesium reacts with dilute hydrochloric acid or dilute sulphuric acid?
Hydrogen gas
What gas is produced when dilute hydrochloric acid is poured over sodium carbonate?
Carbon dioxide gas
Which of the following statements is true about the term 'precipitate'?
It is a solid formed during a chemical reaction that separates from the solution
In the reaction between zinc granules and dilute sulphuric acid, what is the purpose of using dilute acid instead of concentrated acid?
To control the rate of the reaction and prevent it from becoming too violent
Which of the following statements accurately describes the formation of a precipitate?
A precipitate is formed when two aqueous solutions react, and one of the products is insoluble in water.
Which of the following reactions involves the formation of a precipitate?
Reaction between potassium iodide and lead nitrate, producing a yellow precipitate of lead iodide.
What is the purpose of passing a gas into an aqueous solution during a chemical reaction?
To form a precipitate when the product is insoluble in the aqueous solution.
Which of the following reactions involves the formation of hydrogen gas?
Reaction between magnesium and a dilute acid, producing hydrogen gas.
Which gas is commonly used to form a precipitate when passed into an aqueous solution?
Carbon dioxide gas
What is the observable change that occurs when a precipitate is formed during a chemical reaction?
A change in the color of the reaction mixture due to the formation of a solid precipitate.
Learn about how precipitates are solid products that form during chemical reactions, often when one product is insoluble in water. Explore different methods of precipitate formation, such as mixing aqueous solutions or passing a gas into a solution.
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