Acids And Bases

Question 1

Acid/Base + Metal ›

Answer 1

Salt + Hydrogen gas

Question 2

Metal carbonate/Metal hydrogencarbonate + Acid ›

Answer 2

Salt + Carbon dioxide + Water

Question 3

Base + Acid ›

Answer 3

Salt + Water

Question 4

Metal oxide + Acid ›

Answer 4

Salt + Water

Question 5

Bases which are soluble in water

Answer 5

Alkalis

Question 6

Alcohol and glucose do not conduct electricity because

Answer 6

These aren’t ionic compounds. They’re rather covalent compounds and share electrons, thus by having no free electrons, they cannot conduct electricity.

Question 7

p in pH stands for

Answer 7

potenz in German, meaning power

Question 8

pH of body

Answer 8

7.0-7.8

Question 9

pH of acid rain

Answer 9

<5.6

Question 10

Tooth decay starts when pH of mouth is

Answer 10

<5.5

Question 11

Enamel is made up of

Answer 11

Calcium hydroxyapatite, crystalline form of Calcium phosphate

Question 12

NaCl(aq) + H2O(l) ›

Answer 12

NaOH(aq) + Cl2(g) + H2(g) (chlor-alkali process)

Question 13

Formation of Bleaching Powder

Answer 13

Action of chlorine on dry slaked lime.

Ca[OH]2 + Cl2 › CaOCl2 + H2O

Question 14

Bleaching powder

Answer 14

CaOCl2

Question 15

Uses of bleaching powder

Answer 15

1. Textile industry, wood in paper factory, washed clothes.
2. Oxidising agent
3. Drinking water free from germs

Question 16

Formation of Sodium hydrogencarbonate

Answer 16

NaCl + H2O + CO2 + NH3 (ammonia) › NH4Cl (ammonium chloride) + NaHCO3 (sodium hydrogencarbonate)

Question 17

Baking Soda

Answer 17

NaHCO3 (Sodium hydrogencarbonate)

Question 18

Sodium hydrogencarbonate when cooking

Answer 18

NaHCO3 + ∆ →Na2CO3 + H2O + CO2

Question 19

Baking powder

Answer 19

NaHCO3 + Tartaric acid → CO2 + H2O + Baking Soda

Question 20

Formation of Washing Soda

Answer 20

Na2CO3 (sodium carbonate) + 10H2O → Na2CO3•10H2O

Question 21

Uses of washing soda

Answer 21

1. Glass soap and paper industries
2. Manufacturing of borax
3. Cleaning agent
4. Removing permanent hardness of water

Question 22

Hydrated and anhydrous Copper Sulphate soln.

Answer 22

CuSO4•5H2O + ∆ → CuSO4

Question 23

Formation of Plaster of Paris

Answer 23

Heating Gypsum at 100°C or 373°K.

CaSO4•2H2O (Gypsum) + 100°∆ → CaSO4•½H2O (Plaster of Paris/Calcium sulphate hemihydrate) + 1½H2O