Solutions — Chemistry STD 12 Science — Question

If a current of 0.5 ampere flows through a metallic wire for 2 hours, then how many electrons would flow through the wire?

In the following pairs of halogen compounds, which compound undergoes faster S_N1 reaction?

1.  

2.  

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What are zwitter ions?

During nuclear explosion, one of the products is ⁹⁰Sr with half-life of 28.1 years. If 1μg of ⁹⁰Sr was absorbed in the bones of a newly born baby instead of calcium, how much of it will remain after 10 years and 60 years if it is not lost metabolically.

Match the common names given in Column I with the IUPAC names given in Column II.

	Column I (Common names)		Column II (IUPAC names)
(i)	Cinnamaldehyde	(a)	Pentanal
(ii)	Acetophenone	(b)	Prop-2-enal
(iii)	Valeraldehyde	(c)	4-Methylpent-3-en-2-one
(iv)	Acrolein	(d)	3-Phenylprop-2-enal
(v)	Mesityl oxide	(e)	1-Phenylethanone

Answer the following question:
Give reasons for the following:

1. At higher altitudes, people suffer from a disease called anoxia. In this disease, they become weak and cannot think clearly.
2. When mercuric iodide is added to an aqueous solution of KI, the freezing point is raised.

Write a note on primary structure of protein compounds.

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

1. Both assertion and reason are true and the reason is the correct explanation of assertion.
2. Both assertion and reason are true and the reason is not the correct explanation of assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.
5. Assertion is false but reason is true.

Assertion: Conductivity of all electrolytes decreases on dilution.
Reason: On dilution number of ions per unit volume decreases.