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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

What Are Oxides ? - Chemistry

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

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

संबंधित प्रश्न

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

light.


Complete and balance the following chemical equations

Na + H2 O →


What are biocatalysts ?


Name three reducing agents ?


Write true or false :

When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .


State four conditions necessary for a chemical reaction to take place.


Explain the following reaction with one suitable example of Decomposition reaction


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.


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. 


What do you understand by 'chemical reaction'?


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 dilute acid to an active metal.


Complete the table given below.

Heat on sodium chloride Colour imparted to flame during flame test  

Give a balanced equation for the conversion of an ammonium salt to a basic gas.


What happens when cane sugar is strongly heated? Mention any two changes in it.


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


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


Write the equation for the process of formation of rust.


______ is the chemical name of rust.


What is the difference between reactants and products?


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