Q1) Select the correct answer fromA,B,C,D and E for each statement given below:
B: Copper (II) Oxide
D: Copper (II) Hydroxide
The black residue obtained on heating copper carbonate.
The basic gas obtained when two gases react in the presence of a catalyst and the reaction is exothermic.
The gas obtained when potassium chloride is heated in the presence of a catalyst.
The pale blue precipitated obtained when copper [II] sulphide reacts with sodium hydroxide.
The gas which reacts with oxygen to give a neutral liquid.
Q3) A chemical reaction is generally accompanied by certain external indications or characteristics. These include - change of - (a) colour (b) state (c) smell (d) evolution of gas (e) formation of a precipitate (f) evolution or absorption of heat. With reference to change of colour - state the change of colour seen when the following are heated (1) copper carbonate (2) zinc carbonate (3) mercury [II] oxide (4) lead [IV] oxide.
Q4) Give a balanced equation for addition of iron to copper [II] sulphate solution. State the change in colour seen.
Q5) In certain reactions a change of state is observed i.e. solid to liquid, liquid to gas etc. - state the change of state of the products - to give the respective reactants in each case.
Q6) In certain reactions a change of smell is observed. Give two examples from daily life of the same.
Q7) In certain reactions an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in each of the following reactions involving addition of:
Q8) Give examples of exothermic reactions i.e. heat evolved in each of the following:
Give two examples of exothermic reactions seen in everyday life.
Q9) Give one example in each case where supplying energy [given below] is necessary for a chemical reaction.
Q10) Representation of the results of a chemical change - is a chemical equation.
For the equation: FeCl_3+3NH_4OH→3NH_4Cl+Fe(OH)_3
Answer the following:
Q2) Give a word equation for each of the following reactions.
Q3) Name the following:
The silvery residue obtained on heating mercury oxide.
The gas evolved when dilute acid is added to chalk (limestone)
Two non-metal which react explosively when brought in close contact.
Two gases which react under pressure in presence of a catalyst at elevated temperatures to give a gaseous product.
A catalyst which increases the rate of a chemical reaction.
Q4) Give reasons for the following
1) Write the word equation for the following molecular equations:
State the characteristics or indications occurring in the above reaction.
State which characteristic does [g] in the above reaction indicates.
Q2) Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
State which characteristic is observed in the above reaction.
Give an example of a similar above characteristic, seen between two other gaseous reactants.
Q4) Write word equation for the following molecular equations:
Q5) Write word equation for the following molecular equations: FeSO_4+2NaOH→Na_2SO_4+Fe(OH)_2↓
State why [↓] indication is seen after Fe(OH)_2 and not after Na_2SO_4
State why [+△] indication is seen after NH_3
State what 200 atmospheres - indicates.
State the function of Fe in the above reaction.
Terms & Policies
Terms & Policies