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Class 11 Chemistry MCQ Question of The s-Block Elements with Answers?

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Students can solve these The s-Block Elements Class 11 MCQ Questions with Answers and survey their level of the preparations for upcoming exams. Students are encouraged to practice the Class 11 Chemistry MCQ Questions of The s-Block Elements with Answers are accessible here. MCQ Questions for Class 11 Chemistry with Answers are ready according to the Latest Exam Pattern and syllabus.

The initial two groups of components are known as s-Block elements. Elements with the last valence electron in the s orbital are gathered under s-Block components. Metals and components which has 2 electrons in their outermost s orbital are known as alkaline earth metals. Components with 1 electron in their outermost s orbital are known as alkali.

Learn the important multiple-choice questions and score well in examinations: –

Practice MCQ Questions for class 11 Chemistry Chapter-Wise

1. CsOH is

(a) Strongly basic
(b) Weakly basic
(c) Slightly acidic
(d) Amphoteric

2. Solvays process is used for the manufacture of :

(a) NaOH
(b) (Na2CO3. 10H2O)
(c) K2CO3
(d) Na2O2

3. Alkali metals give a .............when dissolved in liquid ammonia

(a) Deep blue solution
(b) Colourless
(c) Red colour
(d) None of the above

4. What are Oxo-Acids?

(a) Acid containing Oxygen
(b) Acid containing Sulphur
(c) Acid containing Carbon
(d) None of the above

5. The substance not likely to contain CaCO3 is

(a) Dolomite
(b) A marble statue
(c) Calcined gypsum
(d) Sea shells

6. Carnallite is the mineral of:

(a) Na
(b) Ca
(c) Mg
(d) None of the above

7. The wire of flash bulb is made up of:

(a) Mg
(b) Ag
(c) Cu
(d) Ba

8. The basic strength of which hydroxide is maximum

(a) LiOH
(b) NaOH
(c) Ca (OH)2
(d) KOH

9. Which of the following alkali metals has the least melting point?

(a) Na
(b) K
(c) Rb
(d) Cs

10. The hydration energy of Mg2+ is larger than that of

(a) Al3+
(b) Na+
(c) Be26
(d) Mg3+

11. The salt that is added to table salt to make it flow freely in rainy season is

(a) KCl
(b) KI
(c) Ca3(PO4)2
(d) Na3PO4

12. Which of the following metals is not manufactured by electrolysis?

(a) Na
(b) Mg
(c) Al
(d) Fe

13. Which element is deposited at the cathode during the electrolysis of brine in Nelson's cell?

(a) H2
(b) Na
(c) CI2
(d) O2

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

(a) Francium
(b) Rubidium
(c) Caesium
(d) None of these

15. 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

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

(a) Rb
(b) Ba
(c) Ag
(d) Pb

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

(a) Li
(b) Rb
(c) K
(d) Na

18. 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

19. The most stable compound is

(a) LiF
(b) LiCl
(c) LiBr
(d) LiI

20. Which compound will show the highest lattice energy

(a) NaF
(b) RbF
(c) CsF
(d) KF

21. When crystal of caustic soda is exposed to air, a liquid layer is deposited because:

(a) crystal melts
(b) crystal loses water
(c) crystal absorbs moisture and CO2
(d) crystal sublimes

22. Brine is chemically:

(a) conc. solution of Na2CO3
(b) conc. solution of Na2SO4
(c) conc. solution of NaCl
(d) conc. solution of alum

23. NO2 is obtained by heating:

(a) CsNO3
(b) KNO3
(c) LiNO3
(d) NaNO3

24. Alkali metals are characterised by:

(a) Good conductors of heat and electricity
(b) High melting points
(c) Low oxidation potentials
(d) High ionisation potentials

25. Alkali metal that reacts with nitrogen to form nitride is -

(a) Li
(b) Na
(c) Cs
(d) None of the above

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Answer:

1. Answer : (a) Strongly basic

Explanation: Caesium is an alkali metal. As we move down the group, the basic strength of alkali hydroxide increases Li to Cs.

2. Answer : (b) (Na2CO3. 10H2O)

Explanation: The Solvay process or ammonia-soda process is the major industrial process for the production of sodium carbonate (soda ash, Na2CO3). The ammonia-soda process was developed into its modern form by the Belgian chemist Ernest Solvay during the 1860s.

3. Answer : (a) Deep blue solution

Explanation: Alkali metals dissolve in liquid ammonia giving deep blue solutions, which conduct electricity. The blue colour of the solution is due to ammoniated electrons, which absorb energy in the visible region of light.

4. Answer : (a) Acid containing Oxygen

Explanation: An oxyacid, oxoacid, or ternary acid is an acid that contains oxygen. Specifically, it is a compound that contains hydrogen, oxygen, and at least one other element, with at least one hydrogen atom bond to oxygen that can dissociate to produce the Hcation and the anion of the acid. e.g., carbonic acid, H2CO3 (OC(OH)2; sulphuric acid, H2SO4 (O2S(OH)2).

5. Answer : (c) Calcined gypsum

Explanation: The composition of gypsum is CaSO4 ∙2H2O. It does not have CaCO3.

6. Answer : (c) Mg

Explanation: Carnallite is a halide mineral a hydrated potassium magnesium chloride. It is variably colored yellow to white, reddish or blue. It takes place with a series of potassium and magnesium evaporite. Many minerals are composed of calcium.

7. Answer : (a) Mg

Explanation: Austrian Paul Vierkotter used magnesium coated wire in an evacuated glass globe to create the first modern photoflash bulb (or flashbulb). 

8. Answer : (d) KOH

Explanation: Potassium hydroxide or caustic potash (KOH) is the strongest base among these hydroxides. Basic strength of hydroxide increase in a group from top to bottom and decrease in a period from left to right.

9. Answer : (d) Cs

Explanation: Cesium (Cs), because as the size of the metal increases, the strength of metallic bonding decreases and hence its meling point decreases. Since the size of Cs is the biggest, therefore its melting point is the lowest.

10. Answer : (b) Na+

Explanation: Hydration energy depends on charge of ion and ionic radius. Higher the charge, greater the hydration energy. On the other hand, smaller the size, greater the hydration energy. Charge is considered first for comparison. Hence, Mg2+ has higher hydration energy than Na+.

11. Answer : (c) Ca3(PO4)2

Explanation: Both Ca and P are needed by human beings. Also they prevent moisture absorbing power of other components such as MgCl2, CaCl2, CaSO4 and MgSO4 present in commercial sodium chloride.

12. Answer : (d) Fe

Explanation: Method of extraction of a metal depends on the reactivity of the metal. Iron (Fe) is not manufacture by electrolysis. Moderately reactive metals like zinc and iron are extracted by reduction of their oxides using carbon.

13. Answer : (a) H2

Explanation: In such cases, electrolysis of brine gives hydrogen gas at the cathode and chlorine gas at the anode.

14. Answer : (a) Francium

Explanation: Naturally occurring radioactive metals include polonium (Po), francium (Fr), radium (Ra), actinium (Ac), thorium (Th), protactinium (Pa), uranium (U), neptunium (Np), and plutonium (Pu).

15. Answer : (a) Ionic radius

Explanation: The ionic radii of alkali metal increases as the atomic number increases when we move form top to bottom because on moving down the group .There is a increase in the number of shells and therefore, ionic radii increases.

16. Answer : (a) Rb

Explanation: The reason for flame colouration is that the energy of the flame causes an excitation of the outermost electrons which when return to their original position, give out the energy so absorbed in the visible region. Thus, Rb gives a red-violet colour to the flame.

17. Answer : (a) Li

Explanation: Lithium (Li) is the alkali metal which forms only normal oxide, Li2O when heated in air.

2Li +1/2O2 → Li2O

18. Answer : (a) KO2

Explanation: KO2 is used because it not only provides oxygen but also removes CO2 both of which are important life supporting processes.

19. Answer : (a) LiF

Explanation: The electronegativity of halogens is as F > Cl > Br > I . Among alkali metals the electropositive character increases as Li < Na < K < Rb < ds. Hence, LiF is the most stable compound.

20. Answer : (a) NaF

Explanation: Sodium fluoride (NaF) shows highest lattice energy among these compounds since Na+ features ions of the same charge, the lattice energy increases as the size of the ions increases.

21. Answer : (c) crystal absorbs moisture and CO2

Explanation: Sodium hydroxide is hygroscopic. When exposed to air, it absorbs moisture and carbon dioxide and forms sodium carbonate.

22. Answer : (c) conc. solution of NaCl

Explanation: Brine is a high-concentration solution of salt (NaCl) in water (H2O).Brine forms naturally due to evaporation of ground saline water but it is also generated in the mining of sodium chloride.

23. Answer : (c) LiNO3

Explanation: Alkali metal nitrates, except lithium, decompose upon strong heating to give oxygen gas and a metal nitrite.

24. Answer : (a) Good conductors of heat and electricity

Explanation: These elements are also excellent conductors of heat and electricity. The alkali metals are very reactive and so are usually found in compounds with other elements, such as salt (sodium chloride, NaCl) and potassium chloride (KCl).

25. Answer : (a) Li

Explanation: Alkali metals that react with nitrogen directly to form nitride is Li. This anamolous behaviour is due to its small size and high polarizing power.

6Li + N2(g) → 2Li3N

Click here to practice MCQ Questions for The s-Block Elements class 11

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