Give reason :
1) Size of atom decreases on moving from left to right in periodic table .
2) Noble gas do not react.
3) Aluminum oxide need 2050° C to dissociate . Why ?
4) Why Temp. is less that 200°. C in Lab prep. of HCl
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Answers
Answer:
1. Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius.
2. The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore, they rarely react with other elements since they are already stable...
3. I not know 3rd Answer
4. In the laboratory preparation of hydrogen chloride from sodium chloride, the gas can be obtained both below and above 200° C. However, the lower temperature is preferred because a higher temperature causes sodium sulphate to form a hard crust, which sticks to the bottom of the flask, and is difficult to remove