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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.

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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

MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

Reduction reaction is the exact opposite of

  1. displacement reaction
  2. decomposition reaction
  3. oxidation reaction
  4. none of these

TRUE \ FALSE

Electrolytic refining is a method in which a thin coating of a metal is done over another metal.


Explain the type of reactions on the basis of the direction of reaction.


Fill in the blank

A new substance is always formed in a _______ change.


Fill in the blank:

The basic conditions necessary for a chemical reaction is _______


Balance the following equation :

Fe + H2O → Fe3O4 + H2


Explain the following reaction with one suitable example of Decomposition reaction


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

Potassium fluoride


Define the following term:

Precipitate


State the type of reactions for the following represent and balance the ones that are not balanced.

Cl2 + 2KBr → 2KCl + Br2 


State the main characteristics of chemical reactions. Give at least one example in each case.


Explain the following statement: Digestion is a chemical change.


Assertion: The formation of iron oxide from iron is a chemical change.

Reason: For the rust to form from iron, it must be exposed to air and water.


Mention the various conditions required for a chemical reaction to occur.


Which of the following is not an “element + element → compound” type reaction?


Water boiling into water vapour is an example of chemical change.


Arrange the following statements in correct sequence:

  1. One side is water-loving and other water-hating molecules.
  2. When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
  3. The dirt surrounded by the detergent molecules floats in the water making it dirty.
  4. Finally, the cloth is clean.
  5. The detergent molecules have two sides.
  6. Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.

Classify the following as physical or chemical properties

Most metal oxides form alkalis on interacting with water.


Give an example of a chemical reaction for the following situation:

A change in colour is observed


The chemical formula of rust is ______.


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