Acid and Bases

Question 1

A chemical substance that gives hydrogen ions in aqueous solution is called

Answer 1

an acid

Question 2

If the concentration of the hydrogen ions is high, the pH is

Answer 2

low

Question 3

substances that identify acidity or alkalinity of substances

Answer 3

Indicators

Question 4

substance that changes color when added to another substance

Answer 4

universal indicator

Question 5

Acids turn

Answer 5

blue litmus red

Question 6

Bases turn

Answer 6

red litmus blue

Question 7

Mention some characteristics of Acid:

Answer 7

It has a sour taste
it produces hydrogen ions.
it is corrosive
pH is less than 7

Question 8

all the molecules become ions in

Answer 8

strong acids

Question 9

few molecules become ions in

Answer 9

weak acids

Question 10

If more molecules of an acid are present in a given volume of solution, the acid will be

Answer 10

concentrated

Question 11

If less molecules of an acid are present in a given volume of solution, the acid will be

Answer 11

diluted

Question 12

acid+metal ——-

Answer 12

salt+hydrogen

Question 13

acid+metal oxide——

Answer 13

salt+water

Question 14

acid+alkali——-

Answer 14

salt+water

Question 15

acid+ metal carbonate——

Answer 15

salt+water+carbon dioxide

Question 16

Mention some characteristics of bases

Answer 16

Gives hydroxide ions
has bitter taste
slippery
soapy

Question 17

Water soluble bases are called

Answer 17

alkalis

Question 18

If the concentration of the hydroxide ions is high, the pH is

Answer 18

high

Question 19

when all the molecules become ions in bases

Answer 19

strong bases

Question 20

when few molecules become ions in bases

Answer 20

weak bases

Question 21

If more molecules of a base are present in a given volume of solution, the base will be

Answer 21

concentrated

Question 22

If less molecules of a base are present in a given volume of solution, the base will be

Answer 22

diluted

Question 23

base+acid——-

Answer 23

salt+water

Question 24

carbonate base+acid+salt——-

Answer 24

salt+water+carbon dioxide

Question 25

base+ammonium salt——–

Answer 25

salt+ammonia+water

Question 26

Acids are proton donors or proton acceptors

Answer 26

proton donors

Question 27

Bases are proton donors or proton acceptors

Answer 27

proton acceptors

Question 28

Strong acids have low pH because

Answer 28

more number of free hydrogen ions present in the solution

Question 29

Strong acids are good or bad conductors of electricity

Answer 29

good

Question 30

Strong bases have high pH because

Answer 30

more number of hydroxide ions present in the solution

Question 31

Weak bases are good or bad conductors of electricity

Answer 31

bad

Question 32

When an acid and a base react, what is formed

Answer 32

water

Question 33

Test for ammonium gas

Answer 33

Turns damp red litmus paper blue

Question 34

Test for oxygen

Answer 34

relights a glowing splint

Question 35

test for hydrogen

Answer 35

Pops with a lighted splint

Question 36

test for carbon dioxide

Answer 36

Turns limewater milky

Question 37

test for chlorine

Answer 37

Bleaches damp litmus paper

Question 38

Rainwater with a lower pH than normal is called

Answer 38

acid rain

Question 39

Rainwater is slightly acidic. natural acidity of rainwater is due to

Answer 39

carbon dioxide in the atmosphere dissolving into the rain

Question 40

Burning of fossil fuels in power station forms

Answer 40

sulfuric dioxide and nitrogen oxide

Question 41

list any one effect of acid rain

Answer 41

acid rain effects rivers and lakes and they become acidic and animals can’t live in them.
Soil becomes acidic, so trees don’t grow well

Question 42

How can we reduce acid rain?

Answer 42

pollutants can be removed before they enter the atmosphere

Exhaust systems can be fitted with a catalytic convertor which turns harmful gases into harmless gases