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प्रश्न
What kind of a change is associated with decaying of a plants?
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उत्तर
Decaying plants is associated with slow change and chemical change.
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
catalyst .
How do the following help in bringing about a chemical change?
heat.
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
Write true or false :
No new substance is formed during a chemical reaction.
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
Select the correct answer for the following options:
The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
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.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
Explain the following statement: Digestion is a chemical change.
Limestone contains ______ mainly.
A reaction between an acid and a base is called ______.
Silver metal can displace hydrogen gas from nitric acid.
Chemists identify gypsum as a natural indicator.
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
What changes do you expect?
How would you show that the settling of curd is a chemical change?
