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Home/chapter 6

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Sonal Chauhan
Sonal Chauhan
Asked: November 27, 2024In: Class 6 Maths

What is an area? Find area of a square and area of a rectangle.

Area is the region enclosed by a shape. The area of a square is side x side. The area of a rectangle is length x breadth. Both are expressed in square units. Class 6 NCERT Ganita Prakash Chapter 6 Perimeter and ...

area of a rectanglearea of a squarecbsechapter 6class 6mathsolutions
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Gk
Gk
Asked: February 7, 2024In: Class 12 Chemistry

Why are aryl halides less reactive towards nucleophilic substitution compared to haloalkanes?

Aryl halides exhibit lower reactivity in nucleophilic substitution due to the resonance effect, which imparts partial double bond character to the C—X bond, making bond cleavage more challenging compared to haloalkanes.

chapter 6chemistryclass 12
  • 1 1 Answer
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Gk
Gk
Asked: February 7, 2024In: Class 12 Chemistry

Why is it crucial to carry out Grignard reactions in dry ether, and what is the significance of avoiding moisture?

Grignard reactions are carried out in dry ether to avoid even traces of moisture. Moisture reacts with Grignard reagents, leading to the protonation of the carbon-magnesium bond and hindering the desired reactivity. Avoiding moisture is essential to prevent unwanted side ...

chapter 6chemistryclass 12
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Ganpati
Ganpati
Asked: February 7, 2024In: Class 12 Chemistry

When was the use of DDT banned in the United States, and what factor contributed to the environmental issues associated with DDT?

The use of DDT was banned in the United States in 1973. DDT’s chemical stability, fat solubility, and slow metabolism in animals led to its accumulation in fatty tissues, causing environmental concerns and contributing to its ban in the U.S., ...

chapter 6chemistryclass 12
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  • 17 Views
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Ganpati
Ganpati
Asked: February 7, 2024In: Class 12 Chemistry

What led to the extensive global use of DDT after World War II, and what problems emerged with its widespread application?

DDT’s global use increased significantly after World War II due to its effectiveness against malaria-spreading mosquitoes and typhus-carrying lice. However, problems emerged in the late 1940s, including the development of insect resistance and high toxicity towards fish.

chapter 6chemistryclass 12
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