Raghav was having 3 metal pieces- He threw all the three pieces one by one in the lake- He then made a table of his observation Metals A B C Reaction Started floating at the surface of water after reacting with water- No reaction No reaction Identify metal A-A- NaB- ZnC- AlD- Ca

The correct option is D CaThe reaction of calcium with water is less violent. Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g) Calcium starts floating because the bubble ...

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Standard X

Chemistry

Reactivity of Different Metals with Water

Raghav was ha...

Question

Raghav was having 3 metal pieces. He threw all the three pieces one by one in the lake. He then made a table of his observation

Identify metal A.

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Solution

The correct option is D
Ca

The reaction of calcium with water is less violent.

Ca(s) + 2H₂O(l) → Ca(OH)₂(aq) + H₂(g)

Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal.

Sodium react violently with cold water. Metals like aluminium and zinc do not react either with cold or hot water.

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Q. Question 3(iii)
Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows:

\begin{matrix} M e t a l & I r o n (I I) s u l p h a t e & C o o p e r (I I) s u l p h a t e & Z i n c s u l p h a t e & S i l v e r n i t r a t e A . & N o r e a c t i o n & D i s p l a c e m e n t B . & D i s p l a c e m e n t & N o r e a c t i o n C . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & D i s p l a c e m e n t D . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n \end{matrix}

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Q. Four metals A, B, C and D are, in turn, added to the following solutions one by one. The observations made are tabulated below:

Metal	Iron (II) sulphate	Copper (II) sulphate	Zinc sulphate	Silver nitrate
A	No reaction	Displacement	-	-
B	Displacement	-	No reaction	-
C	No reaction	No reaction	No reaction	Displacement
D	No reaction	No reaction	No reaction	No reaction

Answer the following questions based on above information:
(i) Which is the most active metal and why?
(ii) What would be observed if B is added to a solution of copper (II) sulphate and why?
(iii) Arrange the metals A, B, C and D in order of increasing reactivity.
(iv) Container of which metal can be used to store both zinc sulphate solution and silver nitrate solution. Give reason for your choice.
(v) Which of the above solutions can be easily stored in a computer made up of any of these metals?

Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.

Metal	Iron (II) sulphate	Cooper (II) sulphate	Zinc sulphate	Silver nitrate
A.	No reaction	Displacement
B.	Displacement		No reaction
C.	No reaction	No reaction	No reaction	Displacement
D.	No reaction	No reaction	No reaction	No reaction

Use the Table above to answer the following questions about metals A, B, C and D.

(i) Which is the most reactive metal?

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Raghav was having 3 metal pieces. He threw all the three pieces one by one in the lake. He then made a table of his observation Identify metal A.

Raghav was having 3 metal pieces. He threw all the three pieces one by one in the lake. He then made a table of his observation

Identify metal A.