metals and non metals

Question 1

a metal which gives hydrogen gas on reacting with dilute acid and alkali

Answer 1

zinc

Question 2

a property possessed by metals in which they can be beaten into sheets

Answer 2

malleability

Question 3

an allotrope of nonmetal which allows electricity to pass through it

Answer 3

carbon

Question 4

a metal which is unaffected by dilute or concentrated acid

Answer 4

aluminum

Question 5

2 best malleable metals

Answer 5

gold and silver

Question 6

a metal which is a good conductor of heat and electricity

Answer 6

silver

Question 7

a metal which is so soft it can be cut with a knife

Answer 7

sodium

Question 8

non metal which is a good conductor of electricity

Answer 8

graphite

Question 9

non metal which is a liquid at room temperature

Answer 9

bromine

Question 10

what are the characteristics of non metals

Answer 10

brittle

acidic oxides

covalent chlorides

5,6,7 valence electrons

discharged at the anode

Question 11

metallic oxide which is amphoteric on nature

Answer 11

zinc oxide

Question 12

metallic oxide which cannot be reduced by normal reducing agents

Answer 12

magnesium oxide

Question 13

hydroxide of this metal is soluble in sodium hydroxide solution

Answer 13

lead

Question 14

chemically rust is __________

Answer 14

Fe2O3.xH2O

Question 15

metal which reacts reversibily with steam

Answer 15

iron

Question 16

metals turn litmus paper_________

Answer 16

blue

Question 17

highly ductile metal

Answer 17

silver

Question 18

the reducing agent used for reuduction of copper2oxide to copper

Answer 18

hydrogen

Question 19

zinc oxide can only be reduced by _________

Answer 19

coke

Question 20

which oxides can be reduced by heating

Answer 20

mercury and silver

Question 21

oxides of sodium and pottasium can be reduced by ___________

Answer 21

electrolysis

Question 22

the metals whose hydroxide does not decompose on heating but its nitrate decomposes is ______________

Answer 22

sodium

Question 23

state 1 observation when zinc granule is added to copper sulphate solution

Answer 23

a red metal starts precipitating and the blue color of copper sulphate solution fades due to the formation of colourless zinc sulphate

Question 24

the gas evolved on reaction of aluminium with boiling concentrated caustic alkali solution

Answer 24

hydrogen

Question 25

examples of metalloids

Answer 25

boron germanium arsenic

Question 26

why aluminium cannot be obtained by the reduction of its oxide with carbon

Answer 26

aluminium has a greater affinity for oxygen than carbon

Question 27

2 metals which on reaction with dilute nitric acid produce hydrogen gas

Answer 27

magnesium and manganese

Question 28

why does calcium not occur in free state

Answer 28

calcium is more electropositive element than hydrogen because it is placed higher than hydrogen in the reactivity series this means it reacts with oxygen and water immediately thus it does not occur freely in free state

Question 29

a non metal which reacts with concentrated nitric acid to form its own acid as one of the products

Answer 29

sulphur

Question 30

2 necessary conditions for rusting

Answer 30

--> presence of oxygen and moisture --> presence of carbon dioxide accelerates the formation of rust

Question 31

2 ways in which rusting can be prevented

Answer 31

--> by painting --> by galvanization

Question 32

a metallic oxide which cannot be reduced with hydrogen

Answer 32

copper oxide [CuO]

Question 33

a metal which is lighter than water

Answer 33

sodium

Question 34

a metal which is unaffected by dilute or concentrated acids

Answer 34

platinum

Question 35

non metal which forms acidic and neutral oxides

Answer 35

carbon

Question 36

non metal which has a metallic lustre

Answer 36

graphite

Question 37

what oxides do metal form

Answer 37

basic oxides

Question 38

what oxides do non metal form

Answer 38

acidic oxides

Question 39

non metal which is slightly soluble in water chemically reactive and spontaneously ignite in an abundant supply of air

Answer 39

white phosphorus

Question 40

a metal which oxidises in air and reacts explosively in water

Answer 40

sodium

Question 41

nitric acid can be stored in an aluminium container but sodium hydroxide cannot be stored in it

Answer 41

the nitric acid reacts with aluminium to form a thin protective aluminium oxide layer on the aluminium surface. This oxide layer renders aluminium passive and prevents it to further react or dissolving in nitric acid. Aluminum is more reactive than Sodium, so displacement reaction will occur and aluminum will displace sodium from sodium hydroxide 2Al + 2NaOH + 2H2O --> 2NaAlO2 + 3H2

Question 42

non metals dont reactwith _____ & ________

Answer 42

water and dilute acids

Question 43

metals react wtih water to form _____ and _____

Answer 43

oxides and hydroxides

Question 44

metals react wtih dilute acids to form _____ and _____

Answer 44

salt and evolve hydrogen gas

Question 45

the metallic oxide which cannot be reduced by hydrogen

Answer 45

zinc oxide

Question 46

non metals turns neutral litmus _____ color

Answer 46

red color

Question 47

1 metal that coul be obtained by the reduction of its oxides with metals

Answer 47

iron

Question 48

2 metals forming hydroxides that decompose on heating

Answer 48

zinc and iron

Question 49

2 metals which dont react with steam

Answer 49

copper and silver

Question 50

what color is cuso4

Answer 50

deep blue