CBSE Class 11 Chemistry The S Block Elements Worksheet

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)

The S Block Elements MCQ Questions with Answers Class 11 Chemistry

Question- Which of the following represents a correct sequence of reducing power of the following elements?

(a) Li > Cs > Rb

(b) Rb > Cs > Li

(c) Cs > Li > Rb

(d) Li > Rb > Cs

Answer-(a)

Question-Na metal is stored in

(a) C₆H₆

(b) kerosene

(c) alcohol

(d) toluene

Answer-(b)

Question-Why lithium react less vigorously with water than other alkali metals?

(a) Lithium has most negative E value

(b) Lithium has small size and very high hydration energy.

(c) Lithium has least negative E value

(d) Both (a) and (b)

Answer-(b)

Question-Which of the following metal is used as a coolant in breeder nuclear reactors?

(a) Potassium

(b) Sodium

(c) Caesium

(d) Rubidium

Answer-(b)

Question- Washing soda has formula

(a) Na₂CO₃.7H₂O

(b) Na₂CO₃.10H₂O

(c) Na₂CO₃.3H₂O

(d) Na₂CO₃

Answer-(b)

Question- Which compound will show the highest lattice energy ?

(a) RbF

(b) CsF

(c) NaF

(d) KF

Answer-(c)

Question-In Solvay ammonia process, sodium bicarbonate is precipitate due to

(a) presence of NH₃

(b) reaction with CO₂

(c) reaction with brine solution

(d) reaction with NaOH

Answer-(c)

Question- In crystals which one of the following ionic compounds would you expect maximum distance between centres of cations and anions?

(a) LiF

(b) CsF

(c) CsI

(d) LiI

Answer-(c)

Question-The products obtained on heating LiNO2 will be

(a) Li₂O+ NO₂ +O₂

(b) Li₃N + O₂

(c) Li₂O+ NO+ O₂

(d) LiNO₃ + O₂

Answer-(a)

Question-What is the colour of solution of alkali metals in liquid ammonia?

(a) Bronze

(b) Blue

(c) Green

(d) Violet

Answer-(b)

Question-On heating anhydrous Na₂CO₃,.......is evolved

(a) CO₂

(b) water vapour

(c) CO

(d) no gas

Answer-(d)

Question-Which of the following metal is used along with lithium to make the alloy named ‘white metal’ ?

(a) Nickel

(b) Aluminium

(c) Silver

(d) Lead

Answer-(d)

Question-Which of the following does not illustrate the anomalous properties of lithium?

(a) The melting point and boiling point of Li are comparatively high

(b) Li is much softer than the other group I metals

(c) Li forms a nitride Li3N unlike group I metals

(d) The ion of Li and its compounds are more heavily hydrated than those of the rest of the group

Answer-(b)

Question-Which is most basic in character ?

(a) CsOH

(b) KOH

(c) NaOH

(d) LiOH

Answer-(a)

Question- Identify the correct statement

(a) Elemental sodium can be prepared and isolated by electrolysing an aqueous solution of sodium chloride

(b) Elemental sodium is a strong oxidising agent

(c) Elemental sodium is insoluble in ammonia

(d) Elemental sodium is easily oxidised

Answer-(d)

Question- Among LiI, NaI, KI, the one which is more ionic and more soluble in water is

(a) KI

(b) NaI

(c) LiI

(d) None of these

Answer-(a)

Question-The process associated with sodium carbonate manufacture is known as

(a) Chamber

(b) Haber

(c) LeBlanc

(d) Castner

Answer-(c)

The S Block Elements MCQ Questions with Answers Class 11 Chemistry

Question- Why Solvay process cannot be extended to the manufacture of potassium carbonate?

(a) Ammonium hydrogen carbonate does not react with potassium chloride.

(b) Potassium hydrogen carbonate is too soluble to be precipitated by the addition of ammonium hydrogencarbonate to a saturated solution of potassium chloride.

(c) Ammonium carbonate is precipitated out instead of potassium hydrogen carbonate on reaction of ammonium hydrogen carbonate with potassium chloride

(d) None of the above

Answer-(b)

Question-Which of the following atoms will have the smallest size ?

(a) Mg

(b) Na

(c) Be

(d) Li

Answer-(c)

Question- Baking soda is

(a) NaHCO₃

(b) K₂CO₃

(c) Na₂CO₃

(d) NaOH

Answer-(a)

Question- Out of the following elements which one do you expect to be most reactive, chemically ?

(a) Mg

(b) Ca

(c) Sr

(d) Ba

Answer-(d)

Question-Which of the following is the most abundant ion within cell fluids?

(a) Sodium ions

(b) Potassium ions

(c) Calcium ions

(d) None of these

Answer-(b)

Question-The first ionization energy of magnesium is lower than the first ionization energy of

(a) Lithium

(b) Sodium

(c) Calcium

(d) Beryllium

Answer-(d)

Question-Which of the following is non-metallic?

(a) B

(b) Be

(c) Mg

(d) Al

Answer-(a)

Question-Electronic configuration of calcium atom may be written as

(a) [Ne], 4p²

(b) [Ar], 4s²

(c) [Ne], 4s²

(d) [Ar], 4p²

Answer-(b)

Question-The outer electronic configuration of alkaline earth metal is

(a) ns²

(b) ns¹

(c) np⁶

(d) nd¹⁰

Answer-(a)

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 first ionization energies of alkaline earth metals are higher than those of alkali metals. This is because

(a) there is no change in the nuclear charge

(b) there is decrease in the nuclear charge of alkaline earth metals

(c) there is increase in the nuclear charge of alkaline earth metals

(d) none of these

Answer-(c)

Question-The most electropositive amongst the alkaline earth metals is

(a) beryllium

(b) magnesium

(c) calcium

(d) barium

Answer-(d)

Question-Baking powder contains :

(a) NaHCO₃, Ca(H₂PO₂)₂ and starch

(b) NaHCO₃, Ca(H₂PO₂)₂

(c) NaHCO₃, starch

(d) NaHCO₃

Answer-(a)

Question-Alkaline earth metals are not found free in nature because of

(a) their thermal instability

(b) their low melting points

(c) their high boiling points

(d) their greater chemical reactivity

Answer-(d)

Question-Which is manufactured by electrolysis of fused NaCl ?

(a) NaOH

(b) Na

(c) NaClO

(d) NaClO₃.

Answer-(b)

Question- Which of the following is/are present as impurity in crude sodium chloride, obtained by crystallisation of brine solution?
(i) Sodium sulphate (ii) Calcium chloride
(iii) Magnesium chloride (iv) Potassium chloride

(a) (i), (ii) and (iv)

(b) (ii) and (iii)

(c) (iii) and (iv)

(d) (i), (ii) and (iii)

Answer-(d)

Question-A firework gives out crimson coloured light. It contains a salt of

(a) Ca

(b) Na

(c) Sr

(d) Ba

Answer-(c)

The S Block Elements MCQ Questions with Answers Class 11 Chemistry

Question- The metals A and B form oxide but B also forms nitride when both burn in air. The A and B are

(a) Cs, K

(b) Mg, Ca

(c) Li, Na

(d) K, Mg

Answer-(d)

Question- Calcitonin and parathyroid hormone regulate concentration of which of the following element in plasma?

(a) Calcium

(b) Magnesium

(c) Sodium

(d) Potassium

Answer-(a)

Question- Arrange the following compounds in order of increasing solubility
(i) MgF₂ (ii) CaF₂,
(iii) BaF₂

(a) (i) < (ii) < (iii)

(b) (ii) < (i) < (iii)

(c) (ii) < (iii) < (ii)

(d) (iii) < (ii) < (i)

Answer-(b)

Question- Which gas is released when CaCO3 reacts with dilute HCl?

(a) H₂

(b) CO₂

(c) O₂

(d) Cl₂

Answer-(b)

Question- The oxidation state shown by alkaline earth metals is

(a) +2

(b) +1, +2

(c) –2

(d) –1, –2

Answer-(a)

Question- In which of the following the hydration energy is higher than the lattice energy?

(a) MgSO₄

(b) RaSO₄

(c) SrSO4

(d) BaSO₄

Answer-(a)

Question- Which one of the following is the most soluble in water?

(a) Mg(OH)₂

(b) Sr(OH)₂

(c) Ca(OH)₂

(d) Ba(OH)₂

Answer-(d)

Question- Of the metals Be, Mg, Ca and Sr of group 2 A. In the periodic table the least ionic chloride would be formed by

(a) Be

(b) Mg

(c) Ca

(d) Sr

Answer-(a)

Question- The order of solubility of sulphates of alkaline earth metals in water is

(a) Be > Mg > Ca > Sr > Ba

(b) Mg > Be >> Ba > Ca > Sr

(c) Be > Ca > Mg > Ba >> Sr

(d) Mg > Ca > Ba >> Be > Sr

Answer-(a)

Question- The solubilities of carbonates decrease down the magnesium group due to a decrease in

(a) hydration energies of cations

(b) inter-ionic attraction

(c) entropy of solution formation

(d) lattice energies of solids

Answer-(a)

Question-  The correct order of increasing thermal stability of K2CO3,MgCO3, CaCO3 and BeCO3 is

(a) BeCO₃< MgCO₃ < CaCO₃ < K₂CO₃

(b) MgCO3 < BeCO₃ < CaCO₃ < K₂CO₃

(c) K₂CO₃ < MgCO₃ < CaCO₃ < BeCO₃

(d) BeCO₃ < MgCO₃ < K₂CO₃ < CaCO₃

Answer-(a)

Question- Alkaline earth metals are

(a) reducing agent

(b) amphoteric

(c) dehydrating agent

(d) oxidizing agent

Answer-(a)

Question- Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

(a) CaSO₄

(b) BeSO₄

(c) BaSO₄

(d) SrSO₄

Answer-(b)

Question- Which of the following is the best method for preparation of BeF₂?

(a) Reaction of Be with F₂

(b) Thermal decomposition of (NH₄)2BeF₄

(c) Reaction of Be with HF

(d) All of the above are equally effective

Answer-(b)

Question- Beryllium shows diagonal relationship with aluminium.Which of the following similarity is incorrect ?

(a) Be forms beryllates and Al forms aluminates

(b) Be(OH)₂ like Al(OH)₃ is basic.

(c) Be like Al is rendered passive by HNO₃ .

(d) Be₂C like Al4C₃ yields methane on hydrolysis.

Answer-(b)

Question- Setting of cement is an

(a) exothermic reaction

(b) endothermic reaction

(c) neither endothermic nor exothermic

(d) example of neutralisation reaction

Answer-(a)

Question- The substance not likely to contain CaCO₃ is

(a) gypsum

(b) sea shells

(c) dolomite

(d) a marble statue

Answer-(a)

Question- Mortar is a mixture of

(a) CaCO₃, sand and water

(b) slaked lime and water

(c) slaked lime, sand and water

(d) CaCO₃ and CaO

Answer-(c)

71. Which of the following alkaline earth metal hydroxides is amphoteric in character

(a) Be(OH)₂

(b) Ca(OH)₂

(c) Sr(OH)₂

(d) Ba(OH)₂

Answer-(a)

Question- Which of the following metal is found in green colouring pigment chlorophyll of plants?

(a) Fe

(b) Mg

(c) Na

(d) Al

Answer-(b)