Color & State Change

Q. Iron is more reactive than copper. Can you write an activity to show this?

Q. Zinc sulphate forms a colourless solution in water. Will you observe any colour change on adding copper turning in it?​

Q. Iron is more reactive than copper. Can you write an activity to show this?

Q.

What happens if a iron nail dipped in copper sulphate solution

Q.

Five 100ml beakers were taken and labelled a, b, c, d, and e about 50 ml of water was taken in each of the beaker and following substances were added to each of them, left undisturbed for sometime and observations where recorded:

Beaker A :CuSo4+Zn

Beaker B :CuSo4+Fe

Beaker C :ZnSo4+Cu

Beaker D :FeSo4+Cu

Beaker E :ZnSo4+Fe

Write also the relevant chemical equation.

Q. Which among the following reacts with steam?

1. Gold
2. Silver
3. Platinum
4. Iron

Q.

Iron nails were dipped in a solution kept in a test tube. After half an hour, it was observed that the colour of the solution has changed. This change of colour is due to the formation of :

1. Zinc sulphate

2. Copper sulphate

3. Iron sulphate

4. Aluminium sulphate

Q. Question 25
Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?

Q. Beakers A, B, and C contain zinc sulphate, silver sulphate, and ferrous sulphate solutions respectively. Copper filings are added to each beaker. Blue colour will appear in which of the following beakers?

1. Beaker A
2. Beaker B
3. Beaker C
4. All the beakers

Q. Beakers A, B, and C contain zinc sulphate, silver sulphate, and ferrous sulphate solutions respectively. Copper filings are added to each beaker. Blue colour will appear in which of the following beakers?

1. Beaker A
2. Beaker B
3. All the beakers
4. Beaker C

Q. A chemical change can be identified by change in colour of the substance.

1. True
2. False

Q.

what would you observe when you put

a) some zinc pieces into blue copper sulphate solution

b) some copper pieces into green ferrous sulphate solution

c) an iron nail into blue copper sulphate solution

Q. zia added a few zinc granules to ferrous sulphate solution and recorded his observations . which of the following are correct? "a) pale green colour of solution turns black.
b) pale green solution of colour of solution disappears and becomes colourless.
c) pale green solution turn blue
d) pale green colour solution disappears, black deposits are seen on granules

Q. Iron is more reactive than copper. Write an activity to show this.

Q. Iron nails were dipped in a solution kept in a test tube. After half an hour, it was observed that the colour of the solution has changed. The solution present in the test tube before the reaction was that of _________.

1. aluminium sulphate
2. zinc sulphate
3. iron sulphate
4. copper sulphate

Q. You have 3 metals and salt solutions of these metals. Test
tube Solution

A	Magnesium sulphate
B	Copper sulphate
C	Ferrous sulphate

When you were away, your younger brother added a metal in a blue coloured solution to make it green. Which of the following could have happened?

1. Iron fell in A
2. Magnesium fell in C
3. Iron fell in B
4. Magnesium fell in B

Q. You have 3 metals and salt solutions of these metals. Test
tube Solution

A	Magnesium sulphate
B	Copper sulphate
C	Ferrous sulphate

When you were away, your younger brother added a metal in a blue coloured solution to make it green. Which of the following could have happened?

1. Iron fell in A
2. Magnesium fell in C
3. Iron fell in B
4. Magnesium fell in B

Q. Which of these suggest that a chemical reaction may be occurring?

1. Change of colour
2. Change of state
3. Change in temperature
4. Emission of gas