Ch 2

Question 1

Strong acids

Answer 1

Hcl
H2so4

Question 2

Weak acids

Answer 2

Hno3 (nitric acid)
CH3cooH (acetic acid)

Question 3

Strong bases

Answer 3

Naoh
Koh

Question 4

Weak bases

Answer 4

Caoh2
Mgoh2
Nh4oh(ammonium) hydroxide

Question 5

Red cabbage in acid and base

Answer 5

Base-red
Acid-green

Question 6

Hydrangea

Answer 6

Acid - blue
Base - pink

Question 7

Methyl orange

Answer 7

Acid - red
Base- yellow

Question 8

Phenophthalein

Answer 8

Acid - colourless
Base- pink

Question 9

Acid + metals

Answer 9

Salt +h2

Question 10

Zn + naoh

Answer 10

Na2 zno2 + h2
(Sodium
Zincate)

Question 11

Metal carbonates and hc

Answer 11

Salt + h2o + co2

Question 12

Na2co3 + hcl

Answer 12

Nacl + h2o + co2

Question 13

Nahco3 + hcl

Answer 13

Nacl + h2o +co2

Question 14

Caoh(lime water) + co2

Answer 14

Caco3 + h2o

Question 15

Caco3 + h2o+ co2

Answer 15

Ca(hco3)2

Question 16

Cuo colour

Answer 16

Black

Question 17

Cuo + hcl

Answer 17

Cucl2 +h20
(Blue- green)

Question 18

Humid temp and passing of hcl

Answer 18

Calcium chloride

Question 19

Hydrogen ions exis in

Answer 19

-H+
-H3o ( hydronium ion)

Question 20

H+ + OH-

Answer 20

H2o

Question 21

Acid rain

Answer 21

Ph<5.6

Question 22

Body works in ph

Answer 22

(7-7.8)

Question 23

Ph in soil of backyard

Answer 23

5-7

Question 24

To neutralize acidic medium in stomach

Answer 24

Magnesium hydroxide (milk of magnesia)

Question 25

Tooth decay occurs in

Answer 25

< 5.5

Question 26

Neetle leaves sting sol

Answer 26

Dock plant

Question 27

Acid in tamarind

Answer 27

Tartaric

Question 28

Tomato acid

Answer 28

Oxalic

Question 29

Curd

Answer 29

Lactic acid

Question 30

Ant , neetle sting

Answer 30

Methanoic acid

Question 31

Common salt

Answer 31

Nacl NaOH + HCl = Nacl + H2o

Question 32

Caustic soda

Answer 32

-Sodium hydroxide (NaOh) -by chlor alkali process -h2 from cathode -cl2 from Anode NaCl+ H2o = NaOH + Cl2 + H2

Question 33

Uses of naOH

Answer 33

Grese Soaps and detergents Paper making Artificial fibres

Question 34

Cl2 uses

Answer 34

Water treatment Disinfection Pesticide Swimming pools

Question 35

H2 uses

Answer 35

Fuels Margarine Ammonia for fertilisers

Question 36

Bleaching powder

Answer 36

Caocl2 Caoh2 + co2= caocl2 + h2o (Slaked lime)

Question 37

Uses of bleaching powder

Answer 37

Bleaching clothes Bleaching wood pulp in paper industry Oxidising agent Germ free water

Question 38

Baking soda

Answer 38

Nahco3 Nacl+h2o+co2+nh3 =nh4cl +nahco3 (Ammonium chloride) Sodium hydrogen carbonate

Question 39

On heating nahco3

Answer 39

Na2co3 + h2o + co2 (Sodium carbonate)

Question 40

Washing soda

Answer 40

Sodium carbonate decahydrate Na2co3.10h2o Recrystallising na2co3 produced on heating nahco3

Question 41

Washing soda uses

Answer 41

Industry Glass soap paper industry Munufacture borax Cleaning agent Remove permanent hardness

Question 42

Plaster of paris

Answer 42

Calcium sulphate hemihydrate Caso4.1/2 h2o On heating gypsum at 373k Gypsum= caso4.2h2o

Question 43

Uses of pop

Answer 43

Doctor for fractured bones Building monuments Toys Decoration To smoothen surfaces

Question 44

Ch

Question 45

Ch