Heated saw dust catches fire when a drop of concentrated nitric acid is added to

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Question
Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
Options
A. dehydration
B. oxidation
C. reduction
D. dehydrogenation

Correct Answer

oxidation

Explanation

Saw dust contains carbon which is oxidised to carbon dioxide by concentrated nitric acid;

8. Silver Mirror test is given by which one of the following compounds? 1. Benzophenone 2. Acetaldehyde 3. Acetone 4. Formaldehyde
Options
A. Only 1
B. Only 2
C. 1 and 3
D. 2 and 4

Correct Answer: 2 and 4

Explanation:

Both Formaldehyde and Acetaldehyde will give this test

$H C H O \overset{[A g (N H_{3})_{2}^{+}]}{?} \overset{A g}{S i l v e r m i r r o r} + O r g a n i c c o m p o u n d$

$C H_{3} - C H O \overset{[A g (N H_{3})_{2}^{+}]}{?} \underset{S i l v e r m i r r o r}{A g} + O r g a n i c c o m p o u n d$

10. Cutting and peeling of onion brings tears to the eyes because of the presence of _____ ?
Options
A. Amino acid
B. Sulfur
C. Carbon
D. Fat

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