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.
(a) False
The metal which is liquid at room temperature is Mercury(Hg). Another metal called Gallium also exists as liquid at room temperature.
(b) False
Coal is made up of carbon. Carbon is a nonmetal. It is non-malleable and non-ductile; hence, coal cannot be drawn into wires.
(c) False
Metals react with dilute acids to form metallic salts and hydrogen gas. For example, zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas.
(d) True
Sodium is a very reactive metal. It can even react with the moisture in the air. The reaction of sodium with water is exothermic. It produces a lot of heat.
(e) False
Copper is less reactive than zinc. It is placed below zinc in the reactivity series of metals. Hence, copper cannot displace zinc from zinc sulphate solution.
(f) True
Rust is a chemically known as iron oxide. Metal oxides are basic in nature. Since, rust is a metal oxide, it will be basic in nature.
(g) False
Metals react with water to produce hydrogen gas. For example, sodium reacts with water to form sodium hydroxide and hydrogen gas.
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- 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. ( )
- 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
- 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……………
- Which of the following statements is not correct?(a) All metal carbonates react with acid to give a salt, water and carbon dioxide(b) All metal oxides react with water to give salt and acid(c) Some metals react with acids to give salt and hydrogen(d) Some non-metal oxides react with water to form an acid
- State whether the following statements are True or False :Sodium is more reactive than magnesium.Magnesium reacts with cold water.All metals exist in solid form at room temperature.Gallium has a low melting point.Gold is alloyed with copper to make it hard.
- A set of metals in order of their increasing chemical reactivity is given below : silver, copper, lead, iron, zinc, magnesium and sodium.Which of the above metals is stored in kerosene ?Which metals will react with cold water ?Which gas will be liberated when metals react with cold water ?Which of the metals will react with oxygen when heated ?Which of the metals become black in the presence of hydrogen sulphide ?
- (a)How do metals react with hydrogen? Explain with an example.(b)How do non-metals react with hydrogen? Explain with an example.
- State whether the following statement are True/False.The property of metals by virtue of which they can be drawn into wires is called ductility.Metals are good conductors of electricity but poor conductor of heat.Articles made up of metals produce ringing sound when struck hard.Oxides of non-metals and metals are acidic in nature.A less reactive metal displaces a more reactive metal from its salt solution in water.
- From among the set of metals — sodium, zinc, iron, copper, silver, select the following giving equations for each reaction :(a) Two metals which will liberate hydrogen from water.(b) One metal which is used to prepare hydrogen gas in the laboratory.(c) One metal which will displace copper from copper sulphate solution.(d) One metal which will not displace copper from copper sulphate solution.
- (a)Why does aluminium not react with water under ordinary conditions?(b)Name two metals which can displace hydrogen from dilute acids.(c)Name two metals which cannot displace hydrogen from dilute acids.
- 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.
- 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
- The metal X reacts with dilute hydrochloric acid to form a gas Y. The metal X also reacts with sodium hydroxide solution (on heating) to form the same gas Y. When a lighted matchstick is applied, this gas burns by producing a ‘pop’ sound.(a) Name two metals which could behave like X(b) Name the gas Y
- (a)Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.(b)Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.
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