Chapter No. 8: Metallurgy.
The flame colour of copper strip is ___________
A. red
B. bluish green
C. white
D. brown
Which of the following elements reacts vigorously with water?
A. Mg
B. K
C. Al
D. Ca
What will you observe when calcium is treated with water?
A. It reacts violently with water
B. It reacts slowly to form calcium oxide.
C. Bubbles of hydrogen gas are formed which stick to the surface of calcium.
d. Bubbles of oxygen gas are formed.
When an iron nail is kept dipped in freshly prepared ferrous sulphate solution taken in a test-tube, _____________
A. the blue colour of the solution changed to green.
B. the green colour of the solution changed to blue.
C. the solution becomes colourless.
D. the colour of the solution did not change.
In which of the following pairs the displacement reaction does NOT occur?
A. CuSO4 solution and silver metal.
B. AgNO3 solution and copper metal.
C. CuSO4 solution and Zn metal
D. FeSO4 solution and AI metal.
When an aluminium strip is dipped into freshly prepared FeSO4 solution, the green colour of the solution __________________.
A. turns to colourless
B. turns light red
C. turns light yellow
D. remains same
The greenish layer formed over the surface of copper vessels is of ____________
A. copper chloride
B. copper sulphate
C. copper oxide
D. basic copper carbonate
Which of the following CAN be used for giving glitter to a corroded copper article?
A. Lemon juice
B. Tamarind juice
C. Silver nitrate solution
D. All of these.
Answers:
Chapter No. 8: Metallurgy.
The flame colour of copper strip is ___________
A. red
B. bluish green
C. white
D. brown
Which of the following elements reacts vigorously with water?
A. Mg
B. K
C. Al
D. Ca
What will you observe when calcium is treated with water?
A. It reacts violently with water
B. It reacts slowly to form calcium oxide.
C. Bubbles of hydrogen gas are formed which stick to the surface of calcium.
d. Bubbles of oxygen gas are formed.
When an iron nail is kept dipped in freshly prepared ferrous sulphate solution taken in a test-tube, _____________
A. the blue colour of the solution changed to green.
B. the green colour of the solution changed to blue.
C. the solution becomes colourless.
D. the colour of the solution did not change.
In which of the following pairs the displacement reaction does NOT occur?
A. CuSO4 solution and silver metal.
B. AgNO3 solution and copper metal.
C. CuSO4 solution and Zn metal
D. FeSO4 solution and AI metal.
When an aluminium strip is dipped into freshly prepared FeSO4 solution, the green colour of the solution __________________.
A. turns to colourless
B. turns light red
C. turns light yellow
D. remains same
The greenish layer formed over the surface of copper vessels is of ____________
A. copper chloride
B. copper sulphate
C. copper oxide
D. basic copper carbonate
Which of the following CAN be used for giving glitter to a corroded copper article?
A. Lemon juice
B. Tamarind juice
C. Silver nitrate solution
D. All of these.
