हिंदी

Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.

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प्रश्न

Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.

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उत्तर

Out of sodium and sulphur, sodium is a metal. so sodium reacts with oxygen to form sodium oxide.

\[\ce{\underset{Sodium}{4Na(s)} + \underset{Oxygen}{O2(g)} -> \underset{Sodium oxide}{2Na2O(s)}}\]

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2018-2019 (March) Set 1

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

The chemical name of baking soda is ______.


Fill in the blank

 A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.


Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.

\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]


Name three reducing agents ?


State four conditions necessary for chemical reactions to take place.


Fill in the blank:
The substances formed as a result of a chemical reaction are called _______


A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.


Give an example of a reaction where the following are involved

Heat


What do you observe? When

Water is added to the quick lime.


Name: Two nitrates that do not produce nitrogen dioxide on heating.


Give a chemical test to distinguish between the following gases. 

CO2 and SO2


Distinguish by heating the following in dry test tubs.

Copper Sulphate and copper carbonate


Distinguish by dilute sulphuric acid.

Copper and magnesium?


A chemical reaction is often accompanied by external indications or characteristics which include – 

  1. Colour change
  2. Effervescence or gas evolved
  3. Evolution or absorption of heat
  4. Formation of a precipitate.

With reference to each of the above indications, state the external indication seen during – Addition of water to quicklime.


Two chemical species X and Y combine together to form a product P which contains both X and Y

\[\ce{X + Y -> P}\]

X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?

(i) P is a compound

(ii) X and Y are compounds

(iii) X and Y are elements

(iv) P has a fixed composition


Classify each of the following, as a physical or a chemical change. Give reasons.

(a) Drying of a shirt in the sun.

(b) Rising of hot air over a radiator.

(c) Burning of kerosene in a lantern.

(d) Change the colour of black tea by adding lemon juice to it.

(e) Churning of milk cream to get butter.


Galvanization is a process in which ______ is coated as a layer of iron.


How would you show that the settling of curd is a chemical change?


Explain how the painting of an iron gate prevents it from rusting.


______ is a chemical substance is used in whitewashing.


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