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Published on: 12/10/2019
Acids, Bases and Salts
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
What is neutralization reaction? Give an example.
2.
Define Aqua regia.
3.
What are the various uses of Aqua regia.
4.
Write any four uses of acids.
5.
Name any two metals which do not react with sodium hydroxide.
6.
Write any five uses of salts.
7.
Write any four uses of bases.
8.
The hydrated salt of copper sulphate has______colour
Red
White
Blue
Pink
9.
The nature of the tooth paste commonly used is in nature
acidic
basic
neutral
neutral
10.
Since metal carbonate and metal bicarbonate are basic they react with acids to give salt and water with the liberation of__________
NO2
SO2
CO2
SO4
11.
Acids in plants and animals are organic acids. Whereas acids in rocks and minerals are_________
Inorganic acids
Weak acids
citric acid
ascorbic acid
12.
Zn + 2HCl \(\longrightarrow \) ZnCl2 + ____\(\uparrow \)(H2' O2' CO2)
H2
O2
CO2
CO2
13.
______are bitter in taste
14.
_______acid is used in aerated drinks
15.
Acids react with metallic oxides to produce______
16.
_________ contain one or more replaceable hydrogen atoms
17.
Acid reacts with base to form a neutral product called_____
18.
Citrus fruits
19.
Hardest substance in our body
20.
Oxalic acid
21.
H3O+
22.
Tomato
23.
Interpret: NHSO4 is an acid salt
24.
Interpret: Al(OH)3 & Zn(OH)2 are not alkalis.
25.
Interpret: CH4 and NH3 are not acids
26.
Complete the equation CaO+H2SO4 ⟶ ?+H2O
27.
Complete the equation Mg+? ⟶ ?+H2
1.
Bases react with acid to form salt and water. This reaction is called as Neutralisation reaction.
Eg: \(\underset {Base}{(KOH)} + \underset {(Acid)}{HCl} \longrightarrow \underset {(Salt)}{KCl} + H_2O\)
2.
The Aqua regia is a mixture of hydrochloric acid and nitric acid prepared optimally in a molar ratio of 3:1. It is a yellow-orange fuming liquid.
3.
1. It is used chiefly to dissolve metals such as gold and platinum.
2. It is used for cleaning and refining gold.
4.
Uses of acids:
(i) Hydrochloric acid is used as a cleansing agent in toilets.
(ii) Citric acid is used in the preparation of effervescent salts and as a food preservative.
(iii) Nitric acid is used in the manufacture of fertilizers, dyes, paints and drugs.
(iv) Carbonic acid is used in aerated drinks.
5.
Copper (Cu) & Silver (Ag).
6.
Common Salt (NaCl) :
It is used in our daily food and used as a preservative.
Washing Soda (Sodium Carbonate - Na2CO3) :
(i) It is used in softening hard water.
(ii) It is used in glass, soap and paper industries.
Baking Soda (Sodium bicarbonate -NaHCO3) :
(i) It is used in making of baking powder which is a mixture of baking soda and tartaric acid.
(ii) It is used in soda-acid fire extinguishers.
(iii) Baking powder is used to make cakes and bread, soft and spongy.
(iv) It neutralizes excess acid in the stomach and provides relief.
Bleaching powder (Calcium Oxychloride - CaOCI2) :
(i) It is used as disinfectant.
(ii) It is used in textile industry for bleaching cotton and linen.
Plaster of Paris (Calcium Sulphate Hemihydrate - CaSO4 .1/2 H2O) :
(i) It is used for plastering bones
(ii) It is used for making casts for statues.
7.
(i) Sodium hydroxide is used in the manufacture of soap.
(ii) Calcium hydroxide is used in white washing of building.
(iii) Magnesium hydroxide is used as a medicine for stomach disorder.
(iv) Ammonium hydroxide is used to remove grease stains from clothes.
8.
(c)
Blue
9.
(b)
basic
10.
(c)
CO2
11.
(a)
Inorganic acids
12.
(a)
H2
13.
( )
Bases
14.
( )
Carbonic acid
15.
( )
salt and water
16.
( )
Acids
17.
( )
Salt
18.
Alkaline soil
19.
Calcium phosphate
20.
Removing black stains
21.
Hydronium ion
22.
Oxalic acid
23.
It is formed by the partial replacement of hydrogen ion of sulphuric acid (H2SO4) by an metal present in sodium hydroxide (NaOH)
NaOH+H2SO4 ⟶ NaHSO4+H2O
24.
Al(OH)3 & Zn(OH)2 are water insoluble bases. So they bases not solution
25.
CH4 and NH3 do not produce hydrogen ion (H+) in its aqueous solution
26.
CaO+H2SO4 ⟶ CaSO4+H2O
27.
Mg+H2SO4 ⟶ MgSO4 +\({ H }_{ 2 }\uparrow \)
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
