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Test: Materials: Metals & Non Metals- 2


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20 Questions MCQ Test Science & Technology for UPSC CSE | Test: Materials: Metals & Non Metals- 2

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Test: Materials: Metals & Non Metals- 2 - Question 1

Metal oxides are :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 1

Metal oxides are basic in nature. When metal oxides react with water, they form bases. Water soluble bases are called s alkalis.

Test: Materials: Metals & Non Metals- 2 - Question 2

Bases turn :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 2

Bases turns red litmus blue but acids turn blue litmus red. Litmus is extracted from lichens that give different colour with different pH.

Test: Materials: Metals & Non Metals- 2 - Question 3

When non-metals react with water then        

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 3

Non-metals don't react with water but the non-metal oxides do react with water and they produce acids. One example is chlorine gas (chlorine oxide) reacts with clouds (water) to form acids which come down as acid rain.

Test: Materials: Metals & Non Metals- 2 - Question 4

The metal which can form a barrier layer of oxide on its surface is :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 4

Aluminium form a barrier layer of oxide on its surface which prevents the further corrosion of aluminium on heating in presence of water.

Test: Materials: Metals & Non Metals- 2 - Question 5

Metal are hard but _____ can be cut with a knife

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 5

Most of the metals are hard but potassium is very soft metal which can be cut with knife. It is stored in kerosene oil to prevent accidental fire.

Test: Materials: Metals & Non Metals- 2 - Question 6

Oxides of non-metals are :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 6

Oxides of non-metal are acidic in nature. Non-metal oxide like SO2 and NO2, when dissolve in water they form sulphuric acid and nitric acid respectively.

Test: Materials: Metals & Non Metals- 2 - Question 7

Metal oxides react with water to produce :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 7

Metal oxides react with water to produce hydroxides of metal which are basic in nature.

Test: Materials: Metals & Non Metals- 2 - Question 8

If metallic Zinc is added to copper sulphate solution :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 8

Zn +CuSO4→ZnSO4 +Cu.Zn +CuSO4→ZnSO4 +Cu.If Zinc is added to copper sulphate solution, Copper is displaced by Zinc because zinc is more reactive than copper.

Test: Materials: Metals & Non Metals- 2 - Question 9

Copper is more reactive than :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 9

Copper is more reactive than Silver but less reactive than magnesium, zinc and iron. Reactivity depends upon ability to loose electrons more easily.

Test: Materials: Metals & Non Metals- 2 - Question 10

Metals that react with oxygen include :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 10

Metals reacts with oxygen to form metal oxide , which are basic in nature. Iron, copper and aluminium reacts with oxygen to form their respective oxides.

Test: Materials: Metals & Non Metals- 2 - Question 11

Calcium disappears into water forming :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 11

When calcium hydroxide (lime water) is passed through carbon dioxide gas water turns milky due to formation of calcium carbonate, which is soluble in water.

Test: Materials: Metals & Non Metals- 2 - Question 12

Metals that react with both acids and bases are called :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 12

Metals that reacts with both acids and bases are called amphoteric. Amphoteric oxides are acidic as well as basic in nature.

Test: Materials: Metals & Non Metals- 2 - Question 13

How many electrons are generally present in metals in their valence shell?

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 13

Metals generally have 1, 2 or 3 electrons in their outermost orbit or valence shell. e.g.,

The number of valence electrons in sodium, magnesium and aluminium metals are 1, 2 and 3 respectively.

Test: Materials: Metals & Non Metals- 2 - Question 14

Brass is an alloy of :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 14

Homogenous mixture of two or more metal or non-metal is called alloy. Alloy of zinc and copper is called brass.

Test: Materials: Metals & Non Metals- 2 - Question 15

Zinc reacts with hydrochloric acid to form :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 15

Zinc reacts with hydrochloric acid to form zinc chloride with evolution of hydrogen gas. Zn+2HCl→ZnCl2+ H2

Test: Materials: Metals & Non Metals- 2 - Question 16

When Silver is added to Copper Nitrate solution result is :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 16

When silver is added to copper nitrate solution, no reaction takes place because silver is less reactive than copper.

Test: Materials: Metals & Non Metals- 2 - Question 17

Rust formation is called:

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 17

Formation of rust on metal surface like iron is also called as corrosion. Corrosion occurs in presence of water and oxygen.

Test: Materials: Metals & Non Metals- 2 - Question 18

That property of a metal by virtue of which it can be drawn into wires is 

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The property of a metal by virtue of which metal can be drawn into thin wires is called ductility. Gold is the most ductile metal.

Test: Materials: Metals & Non Metals- 2 - Question 19

The metal alloyed with gold for making jewellery :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 19

You can wear red gold jewellery with your pieces in white and yellow gold without worrying about the metals clashing. Pure gold is too soft for everyday wear, so it is alloyed with a mixture of metals like silver, copper, platinum, palladium, and zinc to give it strength and durability.

Test: Materials: Metals & Non Metals- 2 - Question 20

Gas evolved when Calcium oxide reacts with water is/are :

Detailed Solution for Test: Materials: Metals & Non Metals- 2 - Question 20

Solution : 

The correct option is Option C.

The calcium metal begins to bubble vigorously as it reacts with the water, producing hydrogen gas, and a cloudy white precipitate of calcium hydroxide.

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