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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

What Are Oxides ?

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प्रश्न

What are oxides ? 

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उत्तर

An oxide is a compound which essentially contains oxygen in its molecule, chemically combined with a metal or a non-metal

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पाठ 6: Chemical Reactions - Exercise 2 [पृष्ठ ८६]

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सेलिना Concise Chemistry [English] Class 8 ICSE
पाठ 6 Chemical Reactions
Exercise 2 | Q 10.1 | पृष्ठ ८६

संबंधित प्रश्‍न

How do the following help in bringing about a chemical change?

catalyst .


Complete and balance the following chemical equations:

`"H"_2"S"` + `"CI"_2`  `→`  


Give reason.

Acidic soil is treated with quick lime.


 Fill in the blank

A change in which the substance can be brought back to its original state is called a _______ change.


Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.

Hydrogen chloride


Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) 

The conversion of ferrous sulphate to ferric sulphate is ______ reaction. 


Distinguish by heating the following in dry test tubs.

Zinc nitrate and copper nitrate.


Select the correct answer for the following options:

The black residue obtained on heating copper carbonate.


On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.

A coloured substance which leaves on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.


Complete the table given below.

Addition of dil. H2SO4 to FeS  Odour of gas evolved  

Select the correct answer from the options given below:

State the gaseous product formed, when

An active metal reacts with dilute sulphuric acid.


Circle the odd one out. Give reason for your choice


What kind of a change is associated with decaying of a plants?


Photosynthesis is a chemical reaction that takes place in the presence of ______.


The water we drink is a combination of hydrogen and oxygen.


Which of the following is/are true when milk changes into curd?

  1. Its state is changed from liquid to semi solid.
  2. It changes colour.
  3. It changes taste.
  4. The change cannot be reversed.

Choose the correct option from below:


______ occurs in the absence of air and in the presence of micro-organisms such as yeast.


Write the chemical reaction of baking soda with lemon.


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


When carbon dioxide is passed through lime water ______.


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