Write the electron-dot structures for sodium, oxygen and magnesium. - Science


Write the electron-dot structures for sodium, oxygen and magnesium.



The representation of elements with valence electrons as dots around the elements is referred to as electron-dot structure for elements.

(a) Sodium(2, 8, 1)=`dot(Na)`

(b) Oxygen (2, 6) = :`ddotO`:

(c) Magnesium (2,8,1) = `ddot(Mg)`

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Chapter 3: Metals and Non-metals - Intext Questions [Page 49]


NCERT Science Class 10
Chapter 3 Metals and Non-metals
Intext Questions | Q 1.1 | Page 49


.................... 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

_________ 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’.

 Write equations for the reactions of calcium and potassium with water

The solution of Aluminium sulphate in water is .....................

(a) Green

(b) Colourless

(c) Pink

(d) Blue

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

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

Give reason for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.

Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.

Fill in the following blank with suitable word:

Calcium is a ................. reactive metal than sodium.

Write the equation for the reaction of Iron with dilute hydrochloric acid.

Name the products formed. Also indicate the physical states of all the substances involved.

The elements whose oxides can turn phenolphthalein solution pink are:
(a) Na and K
(b) K and C
(c) Na and S
(d) K and P

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

An element X reacts with hydrogen, when heated, to form a covalent hydride H2X. If H2X has a smell of rotten eggs, the element X is likely to be:
(a) carbon
(b) sulphur
(c) chlorine
(d) phosphorus

In a solution of lead acetate, a strip of metal M was dipped. After some time, lead from the solution was deposited on the metal strip. Which metal is more reactive, M or lead?

Choose the correct alternative and rewrite the following:

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

Choose the correct alternative and rewrite the following:

Which of the following is lue in colour?

Calcium floats over water during the reaction with water. Give reason.  

Write the chemical equation of the above process.

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. 

Which one among the following is an acidic oxide?

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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