मराठी
सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

A Solution of a Substance ‘X’ is Used for White Washing Write the Reaction of the Substance ‘X’ Named in (A) Above with Water.

Advertisements
Advertisements

प्रश्न

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

एका वाक्यात उत्तर
Advertisements

उत्तर

\[\ce{\underset{\text{quick lime}}{CaO} + H2O ->\underset{\text{slaked lime}}{Ca(OH)2}}\]

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 5: Language of Chemistry - Additional questions

APPEARS IN

सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Additional questions | Q 10.2

संबंधित प्रश्‍न

Give a reason.

Wasp sting is treated with vinegar.


TRUE \ FALSE

Evaporation of water is a physical change. True or false ?


What do you observe when :

an iron nail is kept in tap water for few days


Write true or false :

When potassium iodide solution is added to lead acetate solution a red precipitate is formed.


A chemical equation is a statement that describes a chemical change in terms of


State what you would observe when the following substance is heated in a glass test tube red lead.


Name the type of chemical reaction shown by the following equation :

Fe2O3 + 2Al → Al2O3 + 2Fe


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. 


Give an example of a reaction where the following are involved

Electricity


Give reason for the following:

Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.


What do you observe? When

Water is added to the quick lime.


State the original colour of the following substance and colour of residue obtained after heating.

Ammonium dichromate


What do you observe when CO2 is passed through lime water first and then a little in excess.


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.


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


Higher order Thinking question

A very hot glass on putting in cold water cracks. What does this change indicate?


A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.

Are these changes chemical in nature?


Write five changes in the characteristics of a substance that can take place during a chemical change. 


______ is a chemical substance is used in whitewashing.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×