State whether the given statement  is true or false?The indications that a chemical reaction has occurred are Change in temperature, Change of colour, Formation of precipitates.

# State whether the given statement  is true or false?The indications that a chemical reaction has occurred are Change in temperature, Change of colour, Formation of precipitates.

1. A
True
2. B
False

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### Solution:

The given statement is true.
Concept- The following are the signs that let us know if the reaction has happened or not: -
Temperature change: When a reaction takes place, the mixture or solution either gets hotter or colder.
Change in colour: We can state that a reaction has taken place when a coloured solution changes colour or a colourless solution begins to take on some colour. For instance, when mixing colourless substrates to make dibenzylideneacetone, the result is a brilliant yellowish substance.
Gas emission: This refers to the release or evolution of gases or fumes that are produced during a reaction. For instance, hydrogen gas is created when salt and alcohol are combined.
Precipitate formation: If we combine two liquids and a precipitate forms at the bottom of the beaker or test tube, we have experienced a reaction. For instance, when silver nitrate and sodium chloride solution are combined, a white precipitate results.
Change in pH: A reaction occurs when two solutions with differing pH values are combined, and the resulting solution has a pH that is entirely different.
Hence, the given statement is true.

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