13. Why is lime water basic in nature?
14. Why are the fruit juice and curd not kept in the pot of bell metal?
15. What is called oxyacid? Give example.
16. Name the plants from where the litmuspigment can be obtained?
17. What is called indicator? Give example.
18. What do you mean by a factory indicators?
19. Write the reaction between metal oxide anddilute HCI?
20. Why are metallic oxide called basic oxides?
21. What is universal indicator?
22. What is PH ?
23. What are acidic salts? Give
examples.
24. What are basic salts? Give examples.
25. Name the products which are formed fromthe chloro-alkali process.
26. Write the chemical formulae of the following salts washing soda ,Baking soda, Bleaching powder.
Answers
13) beacuse it does not have so much acidic ptoperties.
14) its not kept in ball metal because the ball metal would corrod and may cause poisanace substance to the food.
17)Indicators are the instruments which do conndect electricity.Eg:-stell or iron.
22) PH are the strips from which we know that the liquid is acidic or neutrial or non acidic.
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Answer:
13.Lime juice is the juice obtained from lime, a citrus fruit. This contains citric acid, and is therefore sour in taste. On the other hand, lime water is a saturated solution of a base called calcium hydroxide (chemical formula Ca(OH)) in water. Hence, lime water is not acidic but basic in nature.
14.Fruit juice and curd get rancid very easily so it is necessary to keep them safe but pot made up of reactive metal react with it due to which fruit juice and curd get destroy. hence, they are not kept in pot of ball metal
15.An oxyacid is an acid that contains an oxygen atom bonded to a hydrogen atom and at least one other element. ... An oxyacid has the general structure X-O-H. Also Known As: oxoacid. Examples: Sulfuric acid (H2SO4), phosphoric acid (H3PO4), and nitric acid (HNO3) are all oxyacids
16.Litmus is mixture of natural dyes and they are extracted from lichens eg. Rocella tinctoria, Lecanora tartarea etc. The litmus is then absorbed onto paper to make an indicator for acids and bases
17.An indicator is a substance that changes its colour in acidic and basic medium.An indicator shows one colour in acidic medium and different colour in basic medium so that they are called indicators. eg:-Litmus , turmeric.
18.There are certain substances whose odour (smell)changes in acidic or basic solutions. ... An olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution.
19.Metallic oxides react with acids to give salts and water. ... After the reaction takes place the colour of the solution becomes blue-green due to the formation of copper (II) chloride and the copper oxide dissolves. This proves that metallic oxides are basic oxides.
20.Metallic oxides are basic in nature because they react with dilute acids to form salt and water. They also react with water to form metal hydroxides which are alkaline in nature, as these metal hydroxides release OH- ions in solution. ... Therefore non metallic oxides are acidic in nature
Explanation:
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