CBSE Class 11 Chemistry The S Block Elements Worksheet Set A

The S Block Elements MCQ Questions with Answers Class 11 Chemistry

Question- Which of the following pairs of substances would give same gaseous product on reaction with water?

(a) Na and Na₂O₂

(b) Ca and CaH₂

(c) Ca and CaO

(d) Ba and BaO₂

Answer-(b)

Question-  Which of the following alkali metal is highly radioactive?

(a) Rubidium

(b) Caesium

(c) Francium

(d) Both (a) and (c)

Answer-(c)

Question- Which of the following is used as a source of oxygen in space capsules, submarines and breathing masks ?

(a) Li₂O

(b) Na₂O₂

(c) KO₂

(d) K₂O₂

Answer-(c)

Question- Ionization potential of Na would be numerically the same as

(a) electron affinity of Na⁺

(b) electronegativity of Na⁺

(c) electron affinity of He

(d) ionization potential of Mg

Answer-(a)

Question-  Which hydride is most stable

(a) NaH

(b) KH

(c) CsH

(d) LiH

Answer-(d)

Question- Which of the following has density greater than water?

(a) Li

(b) Na

(c) K

(d) Rb

Answer-(d)

Question- Which one of the alkali metals, forms only, the normal oxide, M₂O on heating in air ?

(a) Rb

(b) K

(c) Li

(d) Na

Answer-(c)

Question- The elements of group 1 provide a colour to the flame of Bunsen burner due to

(a) low ionization potential

(b) low melting point

(c) softness

(d) presence of one electron in the outermost orbit

Answer-(a)

Question- In the case of the alkali metals

(a) the cation is less stable than the atom

(b) the cation is smaller than the atom

(c) the cation and the atom have about the same size

(d) the cation is larger than the atom

Answer-(b)

Question- Which of the following statements is not correct for alkali metals?

(a) Alkali metals are the most electropositive metals.

(b) Alkali metals exist in free state in nature.

(c) These metals have the largest size in a particular period of the periodic table.

(d) Both (b) and (c)

Answer-(b)

Question- The metal that produces red-violet colour in the nonluminous flame is

(a) Ba

(b) Ag

(c) Rb

(d) Pb

Answer-(c)

Question- The alkali metals have low melting point. Which of the following alkali metal is expected to melt if the room temperature rises to 30°C?

(a) Na

(b) K

(c) Rb

(d) Cs

Answer-(d)

Question- The element which on burning in air gives peroxide is

(a) lithium

(b) sodium

(c) rubidium

(d) caesium

Answer-(b)

Question- Which one of the following properties of alkali metals increases in magnitude as the atomic number rises ?

(a) Ionic radius

(b) Melting point

(c) Electronegativity

(d) First ionization energy.

Answer-(a)

Question- The ionic mobility of alkali metal ions in aqueous solution is maximum for

(a) Li⁺

(b) Na⁺

(c) K⁺

(d) Rb⁺

Answer-(d)

Question- Group 2 elements are called alkaline earth metals why? Choose the correct reason(s).
(i) Hydroxides formed by group 2 elements are alkaline in nature.
(ii) Their metal oxides are found in the earth’s crust.
(iii) Their oxides are alkaline in nature
(iv) Group 2 elements react with alkalies.

(a) (i) and (ii)

(b) (ii) and (iv)

(c) (i), (ii) and (iii)

(d) (ii) and (iii)

Answer-(c)

Question- For an aqueous solution under an electric field which of the following have lowest mobility ?

(a) Li⁺

(b) Na⁺

(c) K⁺

(d) Rb⁺

Answer-(a)

Question- Which is the most basic of the following?

(a) Na₂O

(b) BaO

(c) As₂O₃

(d) Al₂O₃

Answer-(a)

Question- Which of the following has largest size ?

(a) Na

(b) Na⁺

(c) Na^–

(d) Can’t be predicted

Answer-(c)

Question- The most stable compound is

(a) LiF

(b) LiCl

(c) LiBr

(d) LiI

Answer-(a)

Students must free download and practice these worksheets to gain more marks in exams.CBSE Class 11 Chemistry The S Block Elements Worksheet Set A