The normal rain water is slightly acidic and its $pH$ value is $56$ because of which one of the following ?
The normal rain water is slightly acidic and its $pH$ value is $56$ because of which one of the following ?
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- $CO _2+ H _2 O \rightarrow H _2 CO _3$
- $N _2 O _5+ H _2 O \rightarrow 2 HNO _3$
- $2 SO _2+ O _2+2 H _2 O \rightarrow 2 H _2 SO _4$
- $4 NO _2+ O _2+2 H _2 O \rightarrow 4 HNO _3$
The Correct Option is A
Approach Solution - 1
So , the correct option is (A) : $CO _2+ H _2 O \rightarrow H _2 CO _3$
Approach Solution -2
Rainwater is naturally slightly acidic due to the dissolution of carbon dioxide (\( \text{CO}_2 \)) in water, forming carbonic acid (\( \text{H}_2\text{CO}_3 \)):
\[ \text{CO}_2 + \text{H}_2\text{O} \rightarrow \text{H}_2\text{CO}_3 \]
This weak acid dissociates to give a small concentration of \( \text{H}^+ \) ions, lowering the pH of the rainwater to about 5.6.
The other options are related to pollutants like NO\(_2\), SO\(_2\), and N\(_2\)O\(_5\), which are not the primary cause of the natural acidity of rainwater.
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Concepts Used:
Allotropes of Carbon
The existence of a chemical element in one or more physical forms happening in the same physical state is called Allotropes or allotropy. Allotropes may show different physical or chemical states turning on the atom arrangement or the number of existent atoms. While carbon and sulfur is the common element presenting allotropy. Carbon can make further allotropes due to its five-membered valency.
Read More: Allotropes of Carbon
Allotropes of Carbon:
Carbon is part of a p-block element.
- The atomic number of carbon = 6
- It belongs to group 14.
- It makes up about 18.5% of the human body by mass.
Carbon has only two types of allotropes, such as;
- Crystalline
- Amorphous
The crystalline form of carbon consists of allotropes like;
- Diamond
- Graphite
- Fullerenes
The amorphous form of carbon consists of allotropes like;
- Coal
- Coke
- Wood charcoal
- Animal charcoal
- Lampblack
- Gas carbon