Science (English Medium) Class 11 - CBSE Question Bank Solutions

Which of the following statements is not true about classical smog?

Which of the following statements about photochemical smog is wrong?

From where does ozone come in the photochemical smog?

Assertion (A): Photochemical smog is oxidising in nature.

Reason (R): Photochemical smog contains NO₂ and O₃, which are formed during the sequence of reactions.

How can you apply green chemistry for the following:

To control photochemical smog.

Match the following prefixes with their multiples:-

Convert the following into basic units:

28.7 pm

Convert the following into basic units:

15.15 pm

Convert the following into basic units:

25365 mg

In terms of period and group, where would you locate the element with Z =114?

Which element do you think would have been named by Lawrence Berkeley Laboratory?

Which element do you think would have been named by Seaborg’s group?

Write Lewis dot symbols for atoms of the following elements: Mg, Na, B, O, N, Br.

Draw the Lewis structures for the following molecule and ion:

H₂S

Draw the Lewis structures for the given molecule and ion:

SiCl₄

Draw the Lewis structures for the given molecule and ion:

BeF₂

Draw the Lewis structures for the given molecule and ion:

`"CO"_3^(2-)`

Draw the Lewis structures for the following molecule and ion:

HCOOH

Explain why BeH₂ molecule has a zero dipole moment although the Be–H bonds are polar.

What are the reactions involved for ozone layer depletion in the stratosphere?