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Which one of the following is also called stranger gas?

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Important Questions on Elements and Compounds

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General Science>Chapter 12 - Elements and Compounds>Self Check>Q 1
Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to:
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General Science>Chapter 12 - Elements and Compounds>Self Check>Q 2
Rubies and sapphires are chemically known as _____. 
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General Science>Chapter 12 - Elements and Compounds>Self Check>Q 5
Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal respectively?
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General Science>Chapter 12 - Elements and Compounds>Self Check>Q 6
Which one among the following is called philosopher's wool?
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General Science>Chapter 12 - Elements and Compounds>Self Check>Q 7
Which one of the following does not contain silver?
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General Science>Chapter 12 - Elements and Compounds>Self Check>Q 8
Which are the materials generally employed as solder in soldering operation in electronics?
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General Science>Chapter 12 - Elements and Compounds>Self Check>Q 10

Graphene is frequently in the news recently. What is its importance?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and had high optical transparency.
4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs.
Which of the statement(s) given above are correct?

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General Science>Chapter 12 - Elements and Compounds>Self Check>Q 11

Consider the following statements regarding pH value,

1. Plants and animals are pH sensitive as they survive within the pH range of 7.0 to 7.8.

2. Human blood has pH value 7.36-7.42.

3. A change in pH of blood by 0.2 units results in death.

Which of the statement(s) given above is/are correct?