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Science Olympiad Test: Metals and Non-Metals- 2 - Class 10 MCQ


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15 Questions MCQ Test Olympiad Preparation for Class 10 - Science Olympiad Test: Metals and Non-Metals- 2

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Science Olympiad Test: Metals and Non-Metals- 2 - Question 1

Although metals forms basic oxides, which of the following metals form an amphoteric oxide?

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 1

An amphoteric oxide is an oxide that can act either as an acid or as a base to create salt and water in a reaction. The oxidation states open to a chemical species are based on amphoterism. Amphoteric oxides and hydroxides are formed when metals have several oxidation states.
The reactions are given below:
Acts as a basic oxide
Al2O3+ 6HCl → 2AlCl3 + 3H2O
Acts as an acidic oxide
Al2O3+ 2NaOH → 2NaAlO2 + H2O

Science Olympiad Test: Metals and Non-Metals- 2 - Question 2

Reaction between X and Y forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z?

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 2

Because X loses electrons, it is an electropositive metal, whereas Y gains electrons, making it a non-metal.

  • An ionic compound is a mixture of metals and nonmetals.
  • Ionic compounds are solids with a high melting point and good conductivity in molten form.
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Science Olympiad Test: Metals and Non-Metals- 2 - Question 3

Which among the following statements is incorrect for magnesium metal?

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 3

Magnesium reacts with cold water to form magnesium oxide and evolves hydrogen gas is a wrong statement because Magnesium Hydroxide is formed not Magnesium oxide.

Science Olympiad Test: Metals and Non-Metals- 2 - Question 4

Which of the following can undergo a chemical reaction?

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 4

Iron is more reactive than copper hence it displaces copper in the reaction to form FeSO4.

  • Iron displaces copper from its solution. Therefore, copper is less reactive than iron.
  • Copper does not displace any metal therefore it is the least reactive.
Science Olympiad Test: Metals and Non-Metals- 2 - Question 5

Two ml each of concentrated HCl, HNO3 and mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C. The metal could be.

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 5

As per the given question, the Aqua regia is the given mixture to test the metals in test tubes A, B and C. A mixture of three parts of concentrated hydrochloric acid and one part of concentrated nitric acid(Aqua regia - 3 : 1 ratio) is capable of dissolving gold.
Gold is a metal that cannot be dissolved in dilute acids and dissolves only in aqua regia.
Hence, the metal in test tube C must be gold (Au).

Science Olympiad Test: Metals and Non-Metals- 2 - Question 6

If copper is kept open in air, it slowly losses its shining brown surface and gains a green coating. It is due to the formation of

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 6

Metals are usually reactive. Pure copper metal when left exposed to air starts reacting with some gases in the air like carbon dioxide and water vapor. This leads to the formation of copper carbonate and others.
Copper carbonate makes the shiny copper metal become dull and greenish in color.

Science Olympiad Test: Metals and Non-Metals- 2 - Question 7

Silver articles become black on prolonged exposure to air. This is due to the formation

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 7

Silver article become black when exposed to air, because of presence of H2S gas present in air. Thus, silver on reaction with H2S forms a black coating of Ag2S.
Ag (Silver) + H2O (Hydrogen sulphide) → Ag2S (Silver sulphide) + H2

Science Olympiad Test: Metals and Non-Metals- 2 - Question 8

Which of the following metals exist in their native state
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 8

An element is said to be in its native state if it is found in nature in its elementary (uncombined) form. Only metals like gold, platinum, and mercury are mostly found in the free state, i.e., in the pure form.

Science Olympiad Test: Metals and Non-Metals- 2 - Question 9

The electronic configuration of three elements X, Y and Z are X—2, 8;  Y—2, 8, 7 and Z—2, 8, 2 which of the following is correct?

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 9

X = 2, 8 = 10: It is the electronic configuration of neon.
Y = 2, 8, 7 = 17: It is the configuration of the halogen family of chlorine atom which is non-metal
Z = 2, 8, 2 = 12: It is the configuration of alkaline earth metals of magnesium atom which is metal.
Therefore, X is a noble gas, Y is a non-metal, and Z is a metal.

Science Olympiad Test: Metals and Non-Metals- 2 - Question 10

Which of the following statement is not correct?

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 10
  • All metals are solid state at room temperature except mercury. Hence, it is incorrect.
  • All metal are good conductors of heat and electricity.
  • All metal form basic oxides.
  • All metal possess lustre when freshly prepared.
Science Olympiad Test: Metals and Non-Metals- 2 - Question 11

Which of the following are not ionic compounds?
(i) KCl 
(ii) HCl
(iii) CCl4
(iv) NaCl

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 11

Carbon tetrachloride is a covalent compound and dissolves in ether and alcohol like organic compounds. Hydrochloric acid is the gas dissolved in water while hydrogen chloride is the gaseous compound which is covalent in nature by its molecular structure. NaCl and KCl are ionic compounds which dissociate into its ions in the aqueous solution.

Science Olympiad Test: Metals and Non-Metals- 2 - Question 12

Which of the following ore cannot be concentrated by electromagnetic separation?

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 12

Electromagnetic separation is used to concentrate magnetic ores. From the following options, only cuprite is non-magnetic in nature so it cannot be concentrated by electromagnetic separation technique.

Science Olympiad Test: Metals and Non-Metals- 2 - Question 13

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) ?

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 13

HON3 is oxidising agent. It oxidzes metal to metal oxide which further dissolves in HNO3 to form metal nitrate and HNO3 itself is reduced to NO2 or NO or N2O depending upon the nature of the metal and concentration of acid. Mn and Mg are the only metals which react with dilute of HNO3 to produce H2 gas.

Science Olympiad Test: Metals and Non-Metals- 2 - Question 14

Cinnabar is an ore of

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 14
  • An ore consists of desired metal compound from which the metal can be extracted profitably.
  • Cinnabar is an ore of mercury. Its chemical formula is HgS.
  • It is the most common source used for refining elemental mercury.
Science Olympiad Test: Metals and Non-Metals- 2 - Question 15

All ores are minerals but all mineral  are not

Detailed Solution for Science Olympiad Test: Metals and Non-Metals- 2 - Question 15

Ores are minerals from which metals can be extracted conveniently and profitably. Let us take the ore of aluminium, that is bauxite.
Minerals are substances from which metals cannot be extracted conveniently and profitably. For example, Kaolinite is a clay mineral of aluminium. But it is not an ore because aluminium cannot be extracted profitably.
Hence, we can conclude that all ores are minerals but all minerals are not ores.

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