NCERT Class 11 Chapter 10 Chemistry s Block Elements MCQ

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1. 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), (ii) and (iii)

B. (i) and (ii)

C. (ii) and (iv)

D. (ii) and (iii)

2. Which of the following alkali metal is highly radioactive?

A. Francium

B. Rubidium

C. Caesium

D. None of these

3. Which of the following statements is not correct for alkali metals?

A. Alkali metals exist in free state in nature.

B. Alkali metals are the most electropositive metals

C. These metals have the largest size in a particular period of the periodic table.

D. None of these

4. Which of the following has largest size ?

A. Na^–

B. Na

C. Na⁺

D. Can’t be predicted

5. Ionization potential of Na would be numerically the same as

A. electronegativity of Na⁺

B. ionization potential of Mg

C. None of these

D. electron affinity of Na⁺

6. 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

7. Which of the following has density greater than water?

A. Rb

B. Na

C. Li

D. K

8. 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

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

A. Rb

B. Ba

C. Ag

D. Pb

10. 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. Cs

B. K

C. Na

D. Rb

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11. In the case of the alkali metals

A. the cation is smaller than the atom

B. the cation and the atom have about the same size

C. the cation is larger than the atom

D. the cation is less stable than the atom

12. The element which on burning in air gives peroxide is

A. sodium

B. caesium

C. lithium

D. rubidium

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

A. Li

B. Rb

C. K

D. Na

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

A. KO₂

B. Li₂O

C. Both

D. None of these

15. Which hydride is most stable

A. LiH

B. KH

C. NaH

D. CsH

16. The most stable compound is

A. LiF

B. LiCl

C. LiBr

D. LiI

17. Which of the following represents a correct sequence of reducing power of the following elements?

A. Li > Cs > Rb

B. Cs > Li > Rb

C. Rb > Cs > Li

D. Li > Rb > Cs

18. What is the colour of solution of alkali metals in liquid ammonia?

A. Blue

B. Violet

C. Bronze

D. Green

19. Which is most basic in character ?

A. CsOH

B. NaOH

C. KOH

D. LiOH

20. Which compound will show the highest lattice energy

A. NaF

B. RbF

C. CsF

D. KF

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21. CsOH is

A. Strongly basic

B. Weakly basic

C. Slightly acidic

D. Amphoteric.

22. Solvays process is used for the manufacture of :

A. NaOH

B. (Na₂CO₃. 10H₂O)

C. K₂CO₃

D. Na₂O₂

23. Alkali metals give a _________________when dissolved in liquid ammonia

A. Deep blue solution

B. Colourless

C. Red colour

D. None of the Above

24. What are Oxo-Acids?

A. Acid containing Oxygen

B. Acid containing Sulphur

C. Acid containing Carbon

D. None of the Above

25. In curing cement plasters, water is sprinkled from time to time. This helps in

A. converting sand into silicic acid

B. Keeping it cool

C. Developing interlocking needle like crystals of hydrated silicates

D. Hydrating sand and gravel mixed with cement.