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Answers
1. chlorine
2. b option
3. Winter inversion, valley effect in addition to industrial emissions, vehicular emissions are some of the reasons for the increasing amount of air pollution in winter. Dust storms, crop fires, burning of solid fuels for heating, as well as firecracker-related pollution during Diwali also increases winter pollution.
4. The ratio by mass of Nitrogen with Hydrogen in ammonia is 14:3.
5. i. (NH4)2Cr2O7
ii. Al2(SO4)3
iii. Ca3(PO4)2
6. The scattering of the light through the colloid is known as Tyndall effect. The sugar solution is not a colloidal solution, the particles in the sugar solution are too small. ... So, a solution of sugar and water does not show Tyndall effect. On the other hand, the mixture of water and milk show Tyndall effect.
7. a. Isotopes are atoms with the same number of protons but differing numbers of neutrons. Isobars are atoms of different chemical elements having equal values for atomic mass. Isotopes have the same atomic number. Isobars have different atomic numbers.
b. Nuclear medicine uses radioactive isotopes in a variety of ways. One of the more common uses is as a tracer in which a radioisotope, such as technetium-99m, is taken orally or is injected or is inhaled into the body. The radioisotope then circulates through the body or is taken up only by certain tissues.
c. A neutral atom of Carbon-12 contains six protons, six neutrons, and six electrons; therefore, it has a mass number of 12 (six protons plus six neutrons). Neutral carbon-14 contains six protons, eight neutrons, and six electrons; its mass number is 14 (six protons plus eight neutrons).
Unsourced material may be challenged and removed. Chlorine (17Cl) has 25 isotopes with mass numbers ranging from 28Cl to 52Cl and 2 isomers (34mCl and 38mCl). There are two stable isotopes, 35Cl (75.77%) and 37Cl (24.23%), giving chlorine a standard atomic weight of 35.45.
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