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प्रश्न
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
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उत्तर
Chemical Change.
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संबंधित प्रश्न
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
Define precipitation reaction.
What are homogenous reactions ?
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
Give an example of a reaction where the following are involved:
Close contact
Give an example of the following chemical change.
Two gases combine to form white solid
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium dichromate.
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 |
Give a suitable example with an equation to show the representation of a chemical reaction.
A chemical reaction is often accompanied by external indications or characteristics.
NPK are the primary nutrients for plants.
______ is not a chemical change.
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
Water boiling into water vapour is an example of chemical change.
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.
Are these changes chemical in nature?
Write the equation for the process of formation of rust.
