Fill in the blanks :
Phosphorus is a very ………… non-metal.
Metals are …….. conductors of heat and ………
Iron is ……… reactive than copper.
Metals react with acids to produce ………. gas.

Academic Chemistry NCERT Class 8

Fill in the blanks.

Phosphorus is a very reactive non-metal.
Metals are good conductors of heat and electricity.
Iron is more reactive than copper.
Metals react with acids to produce hydrogen gas.

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Updated on: 17-Mar-2023

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Fill in the following blanks with suitable words:(a) Metals are……………. conductors of heat and………………(b) Most non-metals are……………. conductors of heat and electricity.(c) Phosphorous is a very……………. Non-metal.(d) Metals react with acids to produce………… gas.(e) Iron is more…………. than copper.(f) Metals form………oxides whereas non-metals form………oxide.(g) Sulphur forms………oxide whereas magnesium forms……………oxide.(h) A non-metal is used to make an antiseptic solution called tincture……………
State whether the following statements are true or false?(a) All metals exist in solid form at room temperature.(b) Coal can be drawn into wires.(c) Non-metals react with dilute acids to produce hydrogen gas.(d) Sodium is a very reactive metal.(e) Copper displaces zinc from zinc sulphate solution.(f) Rust formed on iron objects is basic in nature.(g) Non-metals react with water to form a gas which burns with a ‘pop’ sound.
State whether the following statement is true or false:Non-metals react with dilute acids to produce a gas which burns with a pop sound.
Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?MagnesiumAluminiumIronCopper
Most non-metals are (bad/good) conductors of heat.
Mark ‘T’ if the statement is true and ‘F’ if it is false.Generally, non-metals react with acids. ( )Sodium is a very reactive metal. ( )Copper displaces zinc from zinc sulphate solution. ( )Coal can be drawn into wires. ( )
……… are the good conductors of heat and electricity.
Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?H2SO4HClHNO3All of these
Fill in the following blanks with suitable words:(a) Magnesium liberates ________ gas on reacting with hot boiling water.(b) The white powder formed when magnesium ribbon burns in oxygen is of ________.(c) Ordinary aluminium stripes are not attacked by water because of the presence of a layer of ________ on the surface of aluminium.(d) A metal having low melting point is ________ but a non-metal having very high melting point is ________.(e) Calcium is a ________ reactive metal than sodium.
Are black and dull surfaces good conductors of heat?
Black and dull surfaces are absorbers of heat. Why the answer to this question is not black and dull surfaces are good conductors of heat?
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4.
Iron is more reactive than copper. Can you write an activity to show this?
Give two examples each: The metals that are good conductors and poor conductors of heat, respectively.
(a) Why is an iron grill painted frequently?(b) Explain why, though aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air.

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