s-, p-, d- & f-Block Elements

9 free MDCAT Chemistry MCQs on s-, p-, d- & f-Block Elements (PM&DC syllabus), each with the answer, an explanation and the textbook line it comes from. Tap to check, no sign-up.

Tap an answer to check it · 9 questions

1. Question 1

   Among the period 3 elements, silicon is a:
   • AGood conductor
   • BSemiconductor
   • CNon-conductor
   • DSuperconductor
   Show answer and explanation

   Answer: B) Semiconductor

   Na, Mg and Al are good conductors; P to Ar are non-conductors. Source: Chemistry 12 KPK (taleem360.com), p. 12.

2. Question 2

   Across period 3, the oxides of the elements change from:
   • AAmphoteric to basic to acidic
   • BAcidic to amphoteric to basic
   • CBasic to amphoteric to acidic
   • DBasic to acidic to amphoteric
   Show answer and explanation

   Answer: C) Basic to amphoteric to acidic

   Na2O and MgO are basic, Al2O3 amphoteric, SiO2 to Cl2O7 acidic. Source: Chemistry 12 KPK (taleem360.com), p. 20.

3. Question 3

   Going down group IA from Li to Cs, the first ionization energy:
   • AFirst rises, then falls
   • BIncreases
   • CStays constant
   • DDecreases
   Show answer and explanation

   Answer: D) Decreases

   Extra shells increase the atomic radius, so the outer electron is lost more easily. Source: Chemistry 12 KPK (taleem360.com), p. 24.

4. Question 4

   Density of the alkali metals increases from Li to Cs, except that one metal is lighter than sodium. It is:
   • APotassium
   • BRubidium
   • CCaesium
   • DFrancium
   Show answer and explanation

   Answer: A) Potassium

   K 0.86 g/cm3 vs Na 0.972 g/cm3. Source: Chemistry 12 KPK (taleem360.com), p. 25.

5. Question 5

   Unlike other alkali metal nitrates, lithium nitrate on heating gives:
   • ALithium nitrite and oxygen
   • BLithium oxide, nitrogen dioxide, oxygen
   • CLithium metal and nitrogen
   • DLithium peroxide and nitrogen
   Show answer and explanation

   Answer: B) Lithium oxide, nitrogen dioxide, oxygen

   Other alkali metal nitrates decompose only to nitrites and oxygen. Source: Chemistry 12 KPK (taleem360.com), p. 28.

6. Question 6

   CCl4 does not react with water but SiCl4 does, because in CCl4:
   • ACarbon is more metallic
   • BCarbon has vacant d orbitals
   • CC-Cl bonds are ionic
   • DBulky chlorines shield carbon
   Show answer and explanation

   Answer: D) Bulky chlorines shield carbon

   Water's oxygen cannot reach the small carbon atom; SiCl4 to PbCl4 react violently with water. Source: Chemistry 12 KPK (taleem360.com), p. 37.

7. Question 7

   CO2 is a gas but SiO2 is a hard, high-melting solid because SiO2 has:
   • AA giant covalent structure
   • BDouble bonds between atoms
   • CIonic bonds throughout
   • DSmall discrete molecules
   Show answer and explanation

   Answer: A) A giant covalent structure

   Each Si is bonded to four O atoms by single bonds; CO2 is discrete linear molecules. Source: Chemistry 12 KPK (taleem360.com), p. 38.

8. Question 8

   The most powerful oxidizing agent among the halogens is:
   • AChlorine
   • BFluorine
   • CBromine
   • DIodine
   Show answer and explanation

   Answer: B) Fluorine

   Oxidizing power: F2 > Cl2 > Br2 > I2. Source: Chemistry 12 KPK (taleem360.com), p. 43.

9. Question 9

   The bleaching action of bleaching powder is due to:
   • ACalcium ions
   • BChlorine gas
   • CNascent oxygen
   • DSulphuric acid
   Show answer and explanation

   Answer: C) Nascent oxygen

   HClO decomposes to HCl and [O], which oxidizes coloured matter. Source: Chemistry 12 KPK (taleem360.com), p. 45.

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