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Metals And Non-metals - Class 10 MCQ


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10 Questions MCQ Test - Metals And Non-metals

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Metals And Non-metals - Question 1

The non-metal which is liquid at room temperature is:

Detailed Solution for Metals And Non-metals - Question 1

Bromine is the only non-metal which exists as a liquid at room temperature.

Metals And Non-metals - Question 2

The number of protons in an atom of an element A is 19 then, the number of electron in its ion A+ is:

Detailed Solution for Metals And Non-metals - Question 2

In the neutral atom of an element,

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Metals And Non-metals - Question 3

Bauxite is an ore of

Detailed Solution for Metals And Non-metals - Question 3

 Bauxite is a commercial ore of aluminium which consists largely of hydrated aluminium oxide, Al2O3.2H2O. 

Metals And Non-metals - Question 4

The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as

Detailed Solution for Metals And Non-metals - Question 4

The process of heating the sulphide ore strongly in the presence of air to convert it into metal oxide, is known as roasting.

Metals And Non-metals - Question 5

In electrolytic refining, the cathode is made up of

Detailed Solution for Metals And Non-metals - Question 5

In electrolytic refining of a metal, the cathode is made up of pure metal whereas the anode is made up of impure metal.

Metals And Non-metals - Question 6

 In the given reaction, Al2O+ NaOH   →  ……X……   +  H2O
What is element X?

Detailed Solution for Metals And Non-metals - Question 6

Aluminium oxide is amphoteric in nature, i.e., it reacts with acids as well as bases to form salt and water.

Metals And Non-metals - Question 7

Which of the following represent the correct order of decreasing reactivity?

Detailed Solution for Metals And Non-metals - Question 7

The decreasing order of the reactivity of the common metals is given below:
  Li, K, Na, Ba, Ca, Mg , Al, Mn, Zn, Fe, Ni, Sn, Pb, [H], Cu,Hg, Ag, Au,Pt 

Metals And Non-metals - Question 8

The electronic configuration of three elements X, Y and Z are as follows:
X = 2, 4, Y = 2, 7, Z = 2,1 Which two elements will combine to form an ionic compound and write the correct formula,

Detailed Solution for Metals And Non-metals - Question 8
Explanation:
Given electronic configurations of the elements X, Y, and Z are:
X = 2, 4
Y = 2, 7
Z = 2, 1
Ionic compounds are formed when atoms gain or lose electrons to achieve a stable electron configuration. The elements X, Y, and Z will combine to form an ionic compound based on their electron configurations.
To determine the correct formula, we need to consider the following:
1. X has 2 valence electrons, so it tends to lose 2 electrons to achieve a stable configuration. It will form a cation with a charge of +2.
2. Y has 2 valence electrons and needs to gain 1 electron to achieve a stable configuration. It will form an anion with a charge of -1.
3. Z has 2 valence electrons and needs to gain 6 electrons to achieve a stable configuration. It will form an anion with a charge of -6.
Based on the charges of the ions formed by X, Y, and Z, we can determine the correct formula for the ionic compound:
- The cation X with a charge of +2 can combine with two anions Z with a charge of -6 to form a neutral compound. The formula for this compound is XZ2.
- The anion Y with a charge of -1 can combine with one cation Z with a charge of +2 to form a neutral compound. The formula for this compound is YZ.
Therefore, the correct formula for the ionic compound formed by X, Y, and Z is YZ.
Metals And Non-metals - Question 9

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 Metals And Non-metals - Question 9

Z is an ionic compound. It has a high melting point.

Metals And Non-metals - Question 10

Which of the statements about the reaction,
ZnO + CO → Zn + CO2 is correct ?

Detailed Solution for Metals And Non-metals - Question 10

The reaction given is: ZnO + CO -> Zn + CO2
To determine which statements about the reaction are correct, we need to analyze the oxidation states of each element involved.
Step 1: Assign oxidation states to each element in the reaction:
- In ZnO, oxygen (O) typically has an oxidation state of -2 and since there is only one oxygen atom, the oxidation state of zinc (Zn) must be +2.
- In CO, oxygen (O) typically has an oxidation state of -2 and carbon (C) typically has an oxidation state of +2, so the oxidation state of carbon (C) in CO is -2.
- In Zn, the overall charge of the compound is 0, so the oxidation state of zinc (Zn) is 0.
- In CO2, oxygen (O) typically has an oxidation state of -2 and since there are two oxygen atoms, the oxidation state of carbon (C) must be +4.
Step 2: Determine the changes in oxidation states:
- The oxidation state of Zn changes from +2 in ZnO to 0 in Zn, which means ZnO is being reduced.
- The oxidation state of C changes from -2 in CO to +4 in CO2, which means CO is being oxidized.
Therefore, the correct statements about the reaction are:
- ZnO is being reduced (ZnO -> Zn)
- CO is being oxidized (CO -> CO2)
Answer: D
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