Question 1 :
What does decomposition reaction for silver bromide require energy in the form of?
Question 2 :
A shiny brown coloured element βXβ on heating in air forms a black coloured compound. What is the black coloured compound formed?
Question 3 :
When a magnesium ribbon is burnt in air, the ash formed is
Question 4 :
State true or false: In electrolysis of water experiment the amount of gas collected in one test tube is equal to the amount of gas collected in another test tube.
Question 5 :
What does decomposition reaction for water require energy in the form of?
Question 6 :
$Fe_2O_3$ + 2Al β $Al_2O_3$ + 2Fe. The above reaction is an example of a
Question 9 :
Write the balanced chemical equations for Calcium hydroxide + Carbon dioxide β Calcium carbonate + Water.
Question 10 :
In the refining of silver from silver nitrate, which reaction is involved?
Question 14 :
Why are decomposition reactions called the opposite of combination reactions? Explain.
Question 15 :
What does decomposition reaction for water require energy in the form of?
Question 17 :
What does decomposition reaction for calcium carbonate require energy in the form of?
Question 19 :
$Fe_2O_3$ + 2Al β $Al_2O_3$ + 2Fe.
The above reaction is an example of a
Question 20 :
What does decomposition reaction for silver bromide require energy in the form of?
Question 22 :
When zinc granules are added to sulphuric acid, the product formed is ?
Question 23 :
What is the substance getting oxidised in $4Na(s) + O_2(g) β 2Na_2O(s)$ ?
Question 25 :
What is the substance getting oxidised in $CuO(s) + H_2(g) β Cu(s) + H_2O(l) $?
Question 26 :
Balance the chemical equation:- $BaCl_2 + H_2SO_4 β BaSO_4 + HCl$.
Question 27 :
A solution of a substance βXβ is used for whitewashing. Name the substance βXβ and write its formula.
Question 29 :
Name the gas collected in one of the test tubes which is double the amount collected in the other in electrolysis of water experiment.
Question 30 :
Magnesium ribbon is rubbed before burning because it has a coating of
Question 31 :
What type of a reaction is $H_2 (g) + Cl_2 (g) β 2HCl(g) ? $
Question 33 :
Write the balanced chemical equations for Aluminium + Copper chloride β Aluminium chloride + Copper.
Question 35 :
What is the colour of the copper sulphate solution after dipping an iron nail in it?
Question 36 :
A solution of a substance X' is used for white washing. Name the substance 'X'.
Question 37 :
A shiny brown coloured element βXβ on heating in air forms a black coloured compound. What is it?
Question 38 :
Balance the chemical equation:- $ NaOH + H_2SO_4 β Na_2SO_4 + H_2O$.
Question 40 :
Write the balanced chemical equations for Zinc + Silver nitrate β Zinc nitrate + Silver.
Question 42 :
What happens when dilute hydrochloric acid is added to iron filings ?
Question 45 :
Why are oil and fat containing food items are flushed with nitrogen?
Question 46 :
When a magnesium ribbon is burnt in oxygen, it gets converted to
Question 47 :
When you add lead nitrate to potassium iodide, their particles combine to form?
Question 48 :
What happens when dilute hydrochloric acid is added to iron filings ?
Question 50 :
What type of a reaction is $Mg (s) + 2HCl (aq) β MgCl_2 (aq) + H_2 (g) ? $