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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

What Do You Observe When Iron Nail is Kept in Copper Sulphate Solution for Sometime. - Chemistry

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प्रश्न

What do you observe when Iron nail is kept in copper sulphate solution for sometime.

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उत्तर

When an iron nail is kept in copper sulphate solution, a reddish brown coating is seen on the iron nail after sometime. Also, the colour of the copper sulphate solution changes from blue to green. This is observed because iron displaces copper from copper sulphate solution as iron is more reactive than copper.

Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)

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अध्याय 6: Chemical Reactions - Exercise 2 [पृष्ठ ८६]

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सेलिना Concise Chemistry [English] Class 8 ICSE
अध्याय 6 Chemical Reactions
Exercise 2 | Q 7.1 | पृष्ठ ८६

संबंधित प्रश्न

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

light.


Complete and balance the following chemical equations:

N2 + O2  →


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


MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

Reduction is a chemical reaction in which there is

  1. removal of hydrogen
  2. removal of oxygen
  3. addition of oxygen
  4. none of these

FILL IN THE BLANK

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


True or false 

New substances are formed in a chemical change.


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


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)

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


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)

Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.


Explain by writing a word equation.

Limestone powder disappears on adding to dilute hydrochloric acids.


Give an example of a reaction where the following are involved:

Close contact


Give an example of the following chemical change.

Two gases combine to form white solid


Define:
Electrochemical reaction
Give one example


Name: Two carbonates do not produce carbon dioxide on heating.


State the original colour of the following substance and colour of residue obtained after heating.

Copper carbonate


Give a chemical test to distinguish between the following gases. 

HCl and Cl2


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.


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

Zinc carbonate to zinc oxide


Burning of paper is a ______ change.


Chemists identify gypsum as a natural indicator.


Match the following:

1. Sodium Chloride a. CaSO41/2H2O
2. Calcium sulphate dihydrate b. C2H5Oh
3. Magnesium sulphate hydrate c. CaSO4.2H2O
4. Calcium sulphate hemihydrate d. NaCl
5. Phenol e. MgSO4.H2O

What is the use of indicator?


Write word equations for two chemical reactions with the help of materials given in the box.

Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water


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.

Are these changes chemical in nature?


______ occurs in the absence of air and in the presence of micro-organisms such as yeast.


We are advised to not to play with fireworks. Give reason.


Write the characteristics of chemical change.


Photosynthesis is a chemical charge. Justify your answer.


The reaction of H2 gas with oxygen gas to form water is an example of ______.


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