Question

TWO MARKS

1) write the essential condition for the following reaction to take place
2AgBr --------> 2Ag +Br 2
Write the applications of this reaction

2 )"we need to balance skeleton chrmical equation"
Give reason to justify the staement

3 )why does the colour copper sulphate solution changes when on iron pin is dipped in it?

4) why do we store silver chloride in dark coloured bottle ? Explain in brief ?

5. What is redox reaction?


THREE MARKS
1) write chemical equation of the reaction in which the following changes takes place with on example of each
A) change in colour
B) change in temperature
C) formation of precipitate

2)Name the two salts that are used in black and white photography .give equations for the reactions when exposed to Sunlight ?

3) Define the term decomposition reaction give example of each of thermal decomposition and electrolytic decomposition?

4)write the chemical equation for reaction taking place when
A) Iron react with steam
B) magnesium react with dil. HCl
C) copper is heated in air

5) "oxidation and reduction prosess occur simultaneously" justify the statement with example?

FIVE MARKS
1) write the balanced chemical equation for the following statements
A)NaoH solution is heated with zinc
B)Excess of Co2 is passed through lime water
C) egg shell dropped in HCL
D)Copper ll oxide react with dilute HC​

Answer 1

Answer:

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