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this question if of class 10th
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Answers
Answer:
7.Chemical name--Sodium hydrogen carbonate
Formula--NaHCO3
9.PH papers are paper infused, or saturated, with pH indicators or more frequently, a mixture of indicators. They are used to test for alkaline or acidity of a solution or substance such as soil. pH papers are usually sold as strips. The scale will tell you if the substance is acidic or alkaline, and to what degree.
10.Plaster of Paris in contact with moisture (water) changes to solid hard mass, gypsum. Therefore, it gets wasted. Hence it should be stored in moisture proof containers.
11
1.Salting icy roads and walkways lowers the freezing point of the water that forms ice which leads to melting and prevents falling snow or rain from being able to freeze.
2.Calcium chloride can be used in place of common salt.
3.The ten most important moral values for students and everyone in general to lead a great life are:
Honesty:
Respect:
Family:
Education and Hard Work:
Adjustment & Compromise:
Compassionate Nature:
Have a look at Presentation on Why Personality Development for Students:
Justice:
12.Q solution has more concentration of H+ ion.We know that, In pH scale 7 is neutral and less than 7 are acidic and more than 7 are basic.
13.
1.To see if the river water contains some acid or not, the specialist can use a blue litmus paper. If the blue litmus paper changes to red, then it is confirmed that the river contains some acid and if the colour does not change, this means river does not contain any acid.
2.Melting is incorrectly used in place of corroding. Corroding is the correct term.
3.Iron drain covers began fizzing because when acid ran over them reacts with iron; it releases hydrogen gas. Due to the formation of hydrogen gas, bubbles occur and this causes fixing of drain covers.
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Explanation:
ANSWER NO. 6 AND 8 IS IN THE TWO ATTACHMENTS
