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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

Complete and Balance the Following Chemical Equations: Pb (No_3)_2 - Chemistry

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प्रश्न

Complete and balance the following chemical equations:

\[\ce{Pb(NO3)2->[heat]}\] _________

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एक पंक्ति में उत्तर

उत्तर

\[\ce{Pb(NO3)2->[heat]PbO + 4No 2+ O2↑}\] 

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अध्याय 6: Chemical Reactions - Exercise 1 [पृष्ठ ७३]

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सेलिना Concise Chemistry [English] Class 8 ICSE
अध्याय 6 Chemical Reactions
Exercise 1 | Q 6.7 | पृष्ठ ७३

संबंधित प्रश्न

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

Iron pipes coated with zinc do not get rusted easily.


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

pressure.


 What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.


 Fill in the blank.
 The formation of gas bubbles in a liquid during a reaction is called ......................


Give reason.

Wasp sting is treated with vinegar.


What are oxides ? 


MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

Compounds, which in their molten state allow an electric current to pass through them are called

  1. electrolytes
  2. non-electrolytes
  3. non-conductors
  4. none of these

FILL IN THE BLANK

........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.


FILL IN THE BLANK

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


FILL IN THE BLANK

The new substances formed during a chemical reaction are called the ..................


TRUE \ FALSE

Positively charged electrode is called the anode. True or false ?


Fill in the blank:
The substances which undergo chemical change are called _______


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


Complete the statement by filling the gaps using 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)

A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.


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

Hydrogen chloride


Explain,giving one example of the following chemical changes:

Reversible reaction


Define:
 Photochemical reaction
Give one example 


Give a chemical test to distinguish between the following gases. 

H2 and CO2


What do you observe when dilute sulphuric acid is added to the following:

Sodium Sulphide


Give balanced equation for the following conversion affected by heat alone on the substance:

Copper carbonate to copper oxide


State the following reaction represent oxidation or reduction.

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


Differentiate between the following:

Neutralization reaction and a precipitation reaction.


When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.


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


Classify the following as physical or chemical properties

Most metal oxides form alkalis on interacting with water.


State whether the following statements are true or false:

When a candle burns, both physical and chemical changes take place.


Rusting of iron is  ______.


When carbon dioxide is passed through lime water ______.


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