Which of the following is a displacement reaction?
Magnesium ribbon is rubbed before burning because it has a coating of
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Which of the following are exothermic processes?
(i) Reaction of water with quick lime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)
Give the ratio in which hydrogen and oxygen are present in water by volume.
MnO2 + 4HCl → 2 + 2H2O + Cl2
identify the substance reduced in the above equation.
When Ag is exposed to air it gets a black coating of
Which of the following is an endothermic process?
A substance added to food containing fats and oils is called:
Name the products formed when iron filings are heated with dilute hydrochloric acid
Which of the following gases can be used for storage
A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple color of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
When green colored ferrous sulphate crystals are heated, the colour of the crystal changes because
Which of the following reactions will not take place?