हिंदी
सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Fill in the Blank: in Some Chemical Reactions an Insoluble ________ is Formed When Two Solutions Are Mixed.

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प्रश्न

Fill in the blank:

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

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उत्तर

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

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अध्याय 5: Language of Chemistry - Objective type questions

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एस पी सिंग Concise Chemistry [English] Class 7 ICSE
अध्याय 5 Language of Chemistry
Objective type questions | Q 1.5

संबंधित प्रश्न

FILL IN THE BLANK

Negatively charged ions are called ..........


Is kerosene an electrolyte or a non-electrolyte ?


Write true or false  : 

Hydrogen sulphide has rotten egg smell .


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

2Mg + O2 → 2MgO


Explain by writing a word equation.

Hard water gets softened on mixing with a solution of washing soda.


Give an example of a reaction where the following are involved

Heat


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

NaOH + HCl → NaCl + H2O


Give a chemical test to distinguish between the following gases. 

H2 and O2


Distinguish by heating the following in dry test tubs.

Zinc nitrate and copper nitrate.


Distinguish by heating the following in dry test tubs.

Copper Sulphate and copper carbonate


Select the correct answer for the following options:

The gas obtained when potassium chlorate is heated in the presence of a catalyst.


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.


Explain the term chemical reaction with special reference to reactants and products.


Select the correct answer from the options given below:

State the gaseous product formed, when

An ammonium salt reacts with an alkali.


______ is not a chemical change.


Chemists identify gypsum as a natural indicator.


If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

Can you change rust back into iron by some simple method?


The chemical formula of rust is ______.


Define the following term:

Chemical change


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