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mcq on S Block Elements for NEET Students

Alkali Metals dissolve in liquid ammonia to form electrically conducting solutions. As the metal concentration increases, the magnetic nature of the solution changes from:

a) diamagnetic to paramagnetic

b) paramagnetic to diamagnetic

c) ferromagnetic to paramagnetic

d) paramagnetic to ferromagnetic

Option b – paramagnetic to diamagnetic

Metal ‘A’ is located in Group 1 and Period 2, while metal ‘B’ is in Group 2. ‘A’ shows diagonal similarity with ‘B’. Identify Metals ‘A’ and ‘B’.

a) Be; Al

b) Li; Be

c) Li; Mg

d) Li; Al

Option c – Li; Mg

Which of the following statements about beryllium chloride is incorrect?

a) It is covalent and dissolves in Organic solvents

b) It forms a chain-like structure in Solid form

c) At elevated temperatures (~1200 K), it exists as a linear monomer

d) It occurs as a trimer with chlorine bridges in the vapor phase

Option d – It occurs as a trimer with chlorine bridges in the vapor phase

The Castner-Kellner process is used for the production of:

a) Sodium carbonate

b) Sodium hydroxide

c) Sodium chloride

d) Sodium bicarbonate

Option b – Sodium hydroxide

An alkaline Earth metal forms an amphoteric oxide. Its ground state electron configuration is:

a) [He] 2s²

b) [He] 2s¹

c) [Ne] 3s²

d) [He] 2s²2p¹

Option a – [He] 2s²

A white compound (A) reacts with dilute HCl to release a colorless gas (B), which turns blue litmus red. Passing (B) through lime water forms a precipitate (C), which dissolves on continued passage to give (D). Identify A and D.

a) CaCO₃, NaHCO₃

b) CaCl₂, Ca(HCO₃)₂

c) CaCO₃, Ca(HCO₃)₂

d) Ca(OH)₂, CaCO₃

Option c – CaCO₃, Ca(HCO₃)₂

Which sodium halide compound has the lowest melting temperature?

a) Sodium chloride

b) Sodium fluoride

c) Sodium bromide

d) Sodium iodide

Option d – Sodium iodide

The concentration of which element in blood plasma is controlled by both parathyroid hormone and calcitonin?

a) potassium

b) sodium

c) calcium

d) magnesium

Option c – calcium

Consider the following statements:

Lithium is softer than other alkali Metals.
Lithium is the strongest reducing agent among alkali Metals.
Lithium has the lowest density among alkali Metals.
Choose the correct option:

a) Only statement 1 is incorrect

b) Only statement 2 is incorrect

c) Statements 1 and 2 are incorrect

d) All three statements are incorrect

Option a – Only statement 1 is incorrect

Identify the incorrect statement about rubidium.

a) It lies in the fifth period of the Periodic Table

b) It forms superoxide upon reaction with oxygen

c) It reacts with water less vigorously than sodium

d) It has lower ionization energy compared to sodium

Option c – It reacts with water less vigorously than sodium

Assertion: Cesium has a larger atomic size than potassium.

Reason: Cesium exhibits a lower ionization energy than potassium.
Choose the correct option:

a) Both Assertion and Reason are true, and Reason explains the Assertion

b) Both Assertion and Reason are true, but Reason does not explain the Assertion

c) Assertion is true, but Reason is false

d) Assertion is false, but Reason is true

Option b – Both Assertion and Reason are true, but Reason does not explain the Assertion

Which gas is released when calcium carbonate reacts with dilute sulfuric Acid?

a) Hydrogen

b) Carbon dioxide

c) Sulfur dioxide

d) Oxygen

Option b – Carbon dioxide

Sodium and potassium primarily help in:

a) maintaining cell membrane structure and aiding blood clotting

b) bone and tooth development

c) transmitting nerve impulses

d) all of the above

Option c – transmitting nerve impulses

An alkali metal reacts with water forming hydrogen gas and compound X. X is a strong Base used in cotton fabric treatment. What is X?

a) KOH

b) Na₂CO₃

c) NaOH

d) Na₂O₂

Option c – NaOH

Which carbonate is unstable in normal conditions and must be stored under CO₂ Atmosphere?

a) Beryllium carbonate

b) Magnesium carbonate

c) Calcium carbonate

d) Barium carbonate

Option a – Beryllium carbonate

When sodium reacts with oxygen, what is the change in the oxidation state of oxygen?

a) 0 to –1

b) 0 to –2

c) –1 to –2

d) +1 to –1

Option a – 0 to –1

Arrange the following in increasing order of electropositivity:

a) Ba < Mg < Ca < Sr < Be

b) Be < Mg < Ca < Ba < Sr

c) Ba < Sr < Ca < Mg < Be

d) Be < Mg < Ca < Sr < Ba

Option d – Be < Mg < Ca < Sr < Ba

Which metal gives a crimson red color during a flame test?

a) Calcium

b) Sodium

c) Lithium

d) Barium

Option c – Lithium

Which of the following represents the correct order of ion mobility for alkali Metals in water?

a) Li < Na < K < Rb < Cs

b) Na < K < Li < Rb < Cs

c) Cs < Rb < K < Na < Li

d) Li < Na < K < Cs < Rb

Option a – Li < Na < K < Rb < Cs

Slaked lime is produced by:

a) adding a small quantity of water to quicklime

b) mixing a limited amount of water with caustic soda

c) reacting quicklime with caustic soda

d) heating limestone between 1070 K and 1270 K

Option a – adding a small quantity of water to quicklime

When a sodium compound (X) is heated, carbon dioxide, water, and a Solid (Y) are produced. Passing CO₂ into a solution of (Y) reforms (X). Identify (X) and (Y).

a) Na₂CO₃, Na₂O₂

b) NaHCO₃, NaOH

c) NaHCO₃, Na₂CO₃

d) Na₂CO₃, NaHCO₃

Option c – NaHCO₃, Na₂CO₃

Among the following, the compound with the greatest basic strength is:

a) Be(OH)₂

b) Mg(OH)₂

c) Ca(OH)₂

d) Ba(OH)₂

Option d – Ba(OH)₂

A mixture of one mole each of Li₂CO₃ and K₂CO₃ is heated. The amount of CO₂ produced is:

a) 2 moles

b) 1 mole

c) 1.5 moles

d) no CO₂ is evolved

Option b – 1 mole

If 4.10 g of anhydrous calcium nitrate is thermally decomposed, what is the Mass of the Solid product left behind?

a) 0.25 g

b) 1.40 g

c) 2.70 g

d) 2.80 g

Option b – 1.40 g

Choose the correct SET of statements about beryllium:

(I) Its halides dissolve in Organic solvents
(II) Its sulfate is highly water-soluble
(III) It can show coordination numbers beyond four
(IV) Its oxide is purely acidic

a) I and II

b) II and III

c) III and IV

d) I and IV

Option a – I and II

Find the mismatched pair:

a) Lithium-lead alloy – used in motor engine bearings

b) Liquid sodium – coolant in fast-breeder reactors

c) Lithium – used in electrochemical cells

d) Potassium chloride – absorbs carbon dioxide effectively

Option d – Potassium chloride – absorbs carbon dioxide effectively

Which of the following elements has the highest first ionization energy?

a) Calcium

b) Beryllium

c) Sodium

d) Magnesium

Option b – Beryllium

Ra and Fr are classified as:

a) alkali and alkaline Earth Metals

b) alkaline Earth and alkali Metals

c) transition and alkali Metals

d) alkaline Earth and transition Metals

Option b – alkaline Earth and alkali metals

Identify the incorrect statement regarding lithium compounds:

a) Lithium chloride is deliquescent and crystallizes as a hydrate

b) Lithium hydrogen carbonate cannot be isolated in Solid form

c) Lithium nitrate decomposes on heating to give nitrite

d) Lithium chloride is soluble in pyridine

Option c – Lithium nitrate decomposes on heating to give nitrite

Which compound is found in the highest proportion in Portland cement?

a) CaO

b) Fe₂O₃

c) SiO₂

d) MgO

Option a – CaO

As we move down Group 2, how do lattice enthalpy, hydration enthalpy, and hydroxide solubility change?

a) All three decrease

b) Lattice and hydration enthalpy decrease; solubility increases

c) Lattice enthalpy decreases; hydration enthalpy and solubility increase

d) Lattice enthalpy increases; hydration enthalpy and solubility decrease

Option b – Lattice and hydration enthalpy decrease; solubility increases

Out of SrCl₂, NaCl, MgCl₂, KCl, BaCl₂, and CaCl₂, how many do not form hydrates?

a) 1

b) 2

c) 3

d) 4

Option b – 2

Which statement is incorrect regarding s-block elements?

a) Alkali metals react with water to release hydrogen

b) They are commonly stored under kerosene

c) Alkali metals are strong oxidizing agents

d) They are soft, silvery, and lightweight

Option c – Alkali metals are strong oxidizing agents

Select the incorrect statement about beryllium:

a) It reacts readily with dilute mineral Acids

b) BeF₂ is formed by heating (NH₄)₂BeF₄

c) Beryllium sulfate is water-soluble

d) Its compounds are mostly covalent and hydrolyze easily

Option a – It reacts readily with dilute mineral Acids

Assertion: The Solvay process is unsuitable for making potassium carbonate.

Reason: Potassium bicarbonate remains too soluble to precipitate upon adding ammonium bicarbonate to KCl solution.