Which of the following are exothermic reactions?
(i) Burning of coal.
(ii) Reaction of water with quicklime.
(iii) Respiration.
(iv) Evaporation of water.
In the balanced equation
a Fe2O3 + b H2 → c Fe + d H2O
The values of a, b, c and d are the respectively:
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Carbon dioxide turns lime water milky due to the formation of:
When a solution of barium chloride in water is added to an aqueous solution of sodium sulphate, the following happens:
The process of reduction involves ______.
In the reaction: 3MnO2 + 4Al → 3Mn + 2Al2O3
The oxidising agent is:
When magnesium ribbon is burnt in air, the ash formed is:
The gas produced on addition of dilute sulphuric acid on powdered zinc is:
When in the blue solution of copper sulphate, zinc strip is dipped, after some time the colour changes to:
In the reaction: SO2(g) + 2H2S(g) → 2H2O(l) + S (s)
The reducing agent is:
A white precipitate can be formed when dil H2SO4 is added to aqueous solution of:
When a solution of barium chloride in water is added to an aqueous solution of sodium sulphate, the following happens :
The formula of rust is:
In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
Which one of the following four metals would be displaced from the solution of its salt by other three metals ?
Which is the reducing agent in the reaction ?
ZnO + C → Zn + CO
The values of a, b, c and d in the balanced chemical equation, a BaCl2 + b Al2(SO4)3 → c AlCl3 + d BaSO4 are:
The formulae of quick lime and limestone are respectively:
............ is a process in which there is loss of electrons.
Which of the following statements about the given reaction are correct?
3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent
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