Question

Write 'True' or 'False'.
1. Corrosion is a chemical reaction.
2. A gas is produced when an acid reacts with iron.
3. Indicators produce a gas when they are added to an acid.
4. Alum is used to bake cakes.
5. Detergents and lime are basic in nature.​

Answer 1

Answer:

1 True 2 True 3 False 4 False 5 True

Answer 2

Required Answer:

1. Corrosion is a chemical reaction.

$\large{\underline{\textsf{\textbf{\green{ True}}}}}$

2. A gas is produced when an acid reacts with iron.

$\large{\underline{\textsf{\textbf{\green{ True}}}}}$

$\longmapsto$ We know that, hydrogen and salt is produced when a metal reacts with acid . Same here, iron(metal) reacts with acid to produce gas(hydrogen).

3. Indicators produce a gas when they are added to an acid.

$\large{\underline{\textsf{\textbf{\red{ False }}}}}$

$\longmapsto$ Indicators don't produce gas,they are just used to identify the nature of substance as it is acidic or basic.

• Examples of indicators are : Turmeric paper, china rose, litmus paper and etc.

4. Alum is used to bake cakes.

$\large{\underline{\textsf{\textbf{\green{ True}}}}}$

$\longmapsto$ Alum is used for baking and pickling.

5. Detergents and lime are basic in nature.

$\large{\underline{\textsf{\textbf{\red{ False }}}}}$

$\longmapsto$ Detergents are basic in nature but lime(fruit) is acidic in nature because it contains citric acid.

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