Q1.the reaction between copper sulphate and hydrogen sulphide can be classified as
1.combination
2.decomposition
3.double displacement
4.displacement
Q2.Peristalic movement refers to
1.contraction and relaxation of heart
2.contraction and expansion of heart
3.contraction and expansion of walls of food pipe
4.movement of food throughout the body
Dear Student,
Ans1. Option (3) is correct: Double displacement reaction
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. This is an example of Double Displacement reaction.
The colour of the solution faded because of the formation of black-coloured CuS and Sulphuric acid. A black precipitate of copper sulphide is formed.
Equation: H2S (g) + CuSO4 (aq) → CuS (s) + H2SO4 (aq)
Ans 2. Option (3) is correct: Contraction and expansion of walls of food pipe
Peristalsis refers to the process by which the food is transported from the buccal cavity to the stomach with the help of the expansion and contraction of the muscles present in the oesophagus. After the peristaltic movement in the oesophagus, food particles move down the oesophagus and reach the stomach.
Ans1. Option (3) is correct: Double displacement reaction
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. This is an example of Double Displacement reaction.
The colour of the solution faded because of the formation of black-coloured CuS and Sulphuric acid. A black precipitate of copper sulphide is formed.
Equation: H2S (g) + CuSO4 (aq) → CuS (s) + H2SO4 (aq)
Ans 2. Option (3) is correct: Contraction and expansion of walls of food pipe
Peristalsis refers to the process by which the food is transported from the buccal cavity to the stomach with the help of the expansion and contraction of the muscles present in the oesophagus. After the peristaltic movement in the oesophagus, food particles move down the oesophagus and reach the stomach.
Regards