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प्रश्न
Name the gases which turn moist red litmus blue.
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उत्तर
Basic gases (NH3)
संबंधित प्रश्न
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
Give reason.
Acidic soil is treated with quick lime.
Give an example of a reaction where the following are involved
Light
Give an example of a reaction where the following are involved
Pressure
What do you observe when Cobalt chloride paper is introduced in water vapour.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A coloured substance which leaves on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
A chemical reaction is often accompanied by external indications or characteristics.
Mention the various conditions required for a chemical reaction to occur.
Rusting of iron is ______.
