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सी.आई.एस.सी.ई.आईसीएसई 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. - Chemistry

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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.

एक पंक्ति में उत्तर
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उत्तर

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

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अध्याय 5: Language of Chemistry - Additional questions

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

संबंधित प्रश्न

State whether the following statement is true or false. In case a statement is false, write the corrected statement.

Iron and rust are the same substances. 


Fill in the blank

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


Give reason .

A person suffering from acidity is advised to take an antacid.


TRUE \ FALSE

Temperature at which a liquid starts boiling is known as the boiling point of that liquid. True or false ?


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

2Mg + O2 → 2MgO


Give a chemical test to distinguish between the following gases. 

CO2 and SO2


Distinguish by heating the following in dry test tubs.

Zinc carbonate, Copper carbonate and lead carbonate.


Give a word equation for the following reaction.

Two gases which combine to give a solid.


Give a word equation for the following reaction.

A compound which on heating shows – colour change from brown to yellow.


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 a black residue and evolves two gases one of which is acidic and coloured and the other neutral and colourless.


Match the chemical reactions in List I with the appropriate answer in List II.

  List I   List II
1. \[\ce{XY⇌[heat]X + Y}\] A: Displacement reaction
2. \[\ce{XY->X + Y}\] B: Double decomposition
3. \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] C: Endothermic reaction
4. \[\ce{X + YZ->XZ + Y}\] D: Thermal dissociation
5. \[\ce{X + Y->[heat]XY -\Delta}\] E: Decomposition reaction

State the following reaction represent oxidation or reduction.

\[\ce{Fe++->Fe+++}\]


NPK are the primary nutrients for plants.


What is the role of a catalyst in a chemical reaction?


Chemical change is a temporary change.


The percentage composition of Nitrogen in Ureas is ______.


Chemists identify gypsum as a natural indicator.


Which of the following are chemical changes?

(i) Decaying of wood

(ii) Burning of wood

(iii) Sawing of wood

(iv) Hammering of a nail into a piece of wood


Chemical changes are important in our day-to-day life. Give examples.


Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.


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