English Medium इयत्ता १० - CBSE Question Bank Solutions

Which class of carbon compounds is responsible for the depletion of ozone layer at the higher level of the atmosphere?

How is ozone formed in the higher level of atmosphere?

 “Damage to the ozone layer is a cause of concern”. Justify this statement.

Which compounds are responsible for the depletion of ozone layer?

What would be the effects on widening of ozone hole?

Why is ozone layer called ozone umbrella/shield?

How are CFCs harmful?

Briefly explain depletion of ozone layer and its effects.

Explain what is smog. Give its effects.

Explain ozone layer, its depletion and effects of ozone depletion.

How is ozone formed in the upper atmosphere? State its importance. What is responsible for its depletion? Write one harmful effect of ozone depletion.

A reagent which can help us to distinguish between alkenes and alkynes is ______.

Which of the following are correct structural isomers of butane?

1. \[\begin{array}{cc}
   \ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{..}\\
   |\phantom{....}|\phantom{....}|\phantom{....}|\phantom{..}\\
   \ce{H - C - C - C - C - H}\\
   |\phantom{....}|\phantom{....}|\phantom{....}|\phantom{..}\\
   \ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{..}
   \end{array}\]
2. \[\begin{array}{cc}
   \ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\
   |\phantom{....}|\phantom{....}|\\
   \ce{H - C - C - C - H}\\
   |\phantom{.....}\backslash\phantom{..}|\\
   \phantom{.....}\ce{H}\phantom{.......}\ce{C - H}\\
   \phantom{.........}|\\
   \phantom{.........}\ce{H}
   \end{array}\]
3. \[\begin{array}{cc}
   \ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\
   |\phantom{....}|\phantom{....}|\\
   \ce{H - C - C - C - H}\\
   |\phantom{....}\phantom{....}|\\
   \ce{H}\phantom{........}\ce{H}\\
   |\\
   \ce{H - C - H}\\
   |\\\ce{H}
   \end{array}\]
4. \[\begin{array}{cc}
   \ce{H}\phantom{...}\ce{H}\\
   |\phantom{....}|\\
   \ce{H - C - C - H}\\
   |\phantom{....}|\\
   \ce{H - C - C - H}\\
   |\phantom{....}|\\
   \ce{H}\phantom{...}\ce{H}
   \end{array}\]

Pentane has the molecular formula C₅H₁₂. It has ______.

How many electrons are there in the outermost orbit of carbon?

Hydrocarbons are mainly composed of which of these?

The number of isomers of pentane is ______.

The problem caused due to ozone hole is ______.

Which of the following may be a conclusion of the excessive exposure of humans to sun’s ultraviolet rays?

1. Peptic ulcers
2. Eye disease like cataract
3. Damage to lungs
4. Skin cancer

Which of the following radiations is responsible for the conversion of atmospheric oxygen to ozone?