CBSE Class 10 Chemistry Metals and Non Metals Worksheet Set D

Assertion and Reason Type MCQs :

Following questions consists of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
A. Both assertion and reason are true, and reason is the correct explanation of assertion.
B. Both assertion and reason are true, but reason is not the correct explanation of assertion.
C. Assertion is true but reason is false.
D. Assertion is false and reason is true.

Question. Assertion(A): MgCl₂ is a covalent compound.
Reason (R): MgCl2is a good conductor of electricity in molten state.

Answer: D

Question. Assertion: MgO exists in liquid state.
Reason: The electrostatic forces of attraction between Mg²⁺ and 0^2- ions constitute ionic bond.

Answer: D

Question. Assertion(A): Magnesium chloride is an ionic compound.
Reason (R): Metals and non-metals react by mutual transfer of electrons.

Answer: A

Question. Assertion: Silver and gold do not react with oxygen even at high temperatures.
Reason: Silver and gold are less active metals.

Answer: A

Question. Assertion: Copper displaces silver from silver nitrate solution.
Reason: Copper is more reactive than silver.

Answer: A

Question. Assertion: On reacting with water, calcium starts floating over water.
Reason: Calcium reacts with cold water at room temperature.

Answer: B

Question. Assertion: C and N do not react with dil. HCl and dil. H₂SO₄.
Reason: Metals do not react with dil. HCl and dil. H₂SO4.

Answer: C

Question. Assertion: Aluminium oxide and zinc oxide are acidic in nature.
Reason: Amphoteric nature means that substance have both acidic and basic character.

Answer: C
 

I. On the basis of reactivity of different metals with oxygen, water and acids as well as displacement reactions, the metals have been arranged in the decreasing order of their reactivities. This arrangement is known as activity series or reactivity series of metals.
The basis of reactivity is the tendency of metals to lose electrons. If a metal can lose electrons easily to form positive ions, it will react readily with other substances. Therefore, it will be a reactive metal. On the other hand, if a meal loses electrons less rapidly to form a positive ion, it will react slowly with other substances. Therefore, such a metal will be less reactive.

Question. Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because HNO, is a strong oxidising agent. It oxidises the H, produced to water and itself gets reduced to any of the nitrogen oxides (N,O, NO, NO₂). But _____________ and _____________ react with very dilute HNO3 to evolve H2 gas.
A. Pb, Cu
B. Na, K
C. Mg, Mn
D. Al, Zn

Answer: C

Question. Which of the following metals reacts vigorously with oxygen?
A. Zinc
B. Magnesium
C. Sodium
D. Copper

Answer: C

Question. Which of the following metal is less reactive than hydrogen?
A. Copper
B. Zinc
C. Magnesium
D. Lead

Answer: A

Question. Which of the following represents the correct order of reactivity for the given metals?
A.Na>Mg>Al>Cu
B.Mg>Na>Al>Cu
C.Na>Mg>Cu>Al
D.Mg > Al > Na > Cu

Answer: A

II. Ionic compound is a chemical compound in which ions are held together by ionic bonds. An ionic bond is the type of chemical bond in which two oppositely charged ions are held through electrostatic forces. We know that, metal atoms have loosely bound valence electrons in their valence shell and non-metal atoms need electrons in their valence shell to attain noble gas configuration. The metal atom loses the valence electrons while non-metal atom accepts these electrons. By losing electrons, metal atoms change to cations and by accepting electrons, non-metals form anions. Ionic compounds are generally solid and exist in the form of crystal. They have high melting and boiling points.

Question. Ionic compounds are soluble in _____________.
A. Kerosene
B. Petrol
C. Water
D. None of these

Answer: C

Question. Which of the following statements is correct about ionic compounds?
I. They conduct electricity in solid state.
II. They conduct electricity in solutions.
III. They conduct electricity in molten state.
A. I only
B. II only
C. III only
D. II and III only

Answer: D

Question. Select the incorrect statement.
A. Ionic compounds are generally brittle
B. Ions are the fundamental units of ionic compounds
C. Formation of ionic bonds involve sharing of electrons
D. NaCl is an ionic compound.

Answer: C

Question. Which of the following can change to a cation?
A. Fluorine
B. Oxygen
C. Potassium
D. Neon

Answer: C

Question. Which of the following can change to an anion?
A. Iodine
B. Magnesium
C. Calcium
D. Xenon

Answer: A

III. The arrangement of metals in a vertical column in the decreasing order of their reactivities is called the reactivity series or activity series of metals. The most reactive metal is at the top position of the reactivity series. The least reactive metal is at the bottom of the reactivity series. Hydrogen, though a non-metal, has been included in the activity series of metals only for comparison. Apart from it, the hydrogen atom also has tendency to lose its valence electron and form cation which behaves like metal H→H⁺ + e⁻

Question. The most reactive metal is
A. potassium
B. barium
C. zinc
D. calcium

Answer: A

Question. The metal which does not liberate hydrogen gas after reacting with acid is
A. zinc
B. lead
C. iron
D. gold

Answer: D

Question. Which of the following metals does not react with water at all?
(I) Sodium
(II) Copper
(III) Aluminium
(IV) Gold
A. I and III only
B. IV only
C. II and IV only
D. I, II, III and IV 

Answer: C

Question. Which metal can be displaced by copper from its salt solution?
A. Zinc
B. Silver
C. Iron
D. Lead

Answer: B

Question. An element 'X after reacting with acids liberates hydrogen gas and can displace lead and mercury from their salt solutions. The metal 'X is
A. copper
B. gold
C. calcium
D. hydrogen.

Answer: C