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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

A Solution of a Substance ‘X’ is Used for White Washing Name the Substance ‘X’ and Write Its Formula.

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प्रश्न

A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.

एक पंक्ति में उत्तर
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उत्तर

Calcium oxide CaO

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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 10.1

संबंधित प्रश्न

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

catalyst .


Give reason.

Acidic soil is treated with quick lime.


FILL IN THE BLANK

In a ............ change, new substances are formed.


Fill in the blank:

In some chemical reactions an insoluble ________ is formed when two solutions are mixed.


Write true or false :

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


Explain the following reaction with one suitable example of Displacement reaction.


Complete the statement by filling the gap using an  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)

An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.


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

Sodium chloride


Give reason for the following:

Silver nitrate solution is kept in coloured bottles.


Give a word equation for the following reaction.

Two solids which combine on heating, to give a liquid.


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 white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.


Higher order Thinking question

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


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.


Analogy:

H2O: Water:: NaCl: ______.


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.


Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings


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

A change in colour is observed


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.

Write a word equation for the chemical change, if any.


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