Explain the Following Reaction with the Help of a Balanced Chemical Equation: Magnesium Reacts with Hot Water. - Science and Technology 2


Explain the following reaction with the help of a balanced chemical equation:
Magnesium reacts with hot water.



Magnesium does not react with cold water but reacts with hot water to form magnesium hydroxide with the evolution of hydrogen gas.
Mg + 2H2O → Mg(OH)2 + H2

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2016-2017 (March)



.................... liberated when acetic acid reacts with sodium metal.
(a) Hydrogen
(b) Chlorine
(c) Oxygen
(d) Nitrogen

A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green

Metal A has electronic configuration (2, 8, 1) and metal B has (2, 8, 8, 2). Which is more reactive? Why? Identify these metals.

_________ solution is blue in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3

Iron is
(a) More reactive than zinc
(b) More reactive than aluminium
(c) Less reactive than copper
(d) Less reactive than aluminium

Name the following:
Metals which forms an amphoteric oxide.

‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so:
i. What is the nature of oxide E2O ?
ii. Write the name of element ‘E’.

 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?
(ii) What would you observe if B is added to a solution of copper (II) sulphate?
(iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.

The reaction of an iron nail with copper sulphate solution is ........... reaction.

(a) Combination

(b) Displacement

(c) Double displacement

(d) Decomposition

A solution of _________________ in water is green in colour.

(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3

Name two metals which form amphoteric oxides.

How do metals react with hydrogen? Explain with an example.

Out of aluminium, copper, calcium and tin, the most reactive metal is:
(a) aluminium
(b) copper
(c) tin
(d) calcium

The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead

Out of the following oxides, the amphoteric oxide is:
(a) Fe2O3
(b) Al2O3
(c) P2O5
(d) N2O

The elements whose oxides can turn litmus solution blue are:
(a) carbon and sulphur
(b) sodium and carbon
(c) potassium and magnesium
(d) magnesium and sulphur

Which of the following reactions will not occur? Why not?

(a) MgSO(aq) + Cu (s) → CuSO(aq) + Mg (s)

(b) CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu (s)

(c) MgSO4 (aq) + Fe (s) → FeSO4 (aq) + Mg (s)

In nature, metal A is found in a free state while metal B is found in the form of its compounds. Which of these two will be nearer to the top of the activity series of metals?

Choose the correct alternative and rewrite the following:

Reaction of iron nails whith copper sulphate solution is an example of _____________________

Write the chemical equation of the above process.

Rewrite the following statement by selecting the correct option.
A solution of Al2(SO4)3 in water is _____________.

Answer the following question:
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is metal or a non - metal. Explain with a proper example. 

The substance that will be flattened on beating with a hammer is

Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?

Which of the following property is not responsible for copper to be used as electrical conduction wires?

Find the odd one out:

Tungsten wire is used in electric bulbs.


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