TestUstad
Moderate

CO₂ is gas while SiO₂ is solid at room temperature. This is due to

Correct answer: B. CO₂ is an independent molecule while SiO₂ has a network covalent structure

  • A. Carbon is non-metal while silicon is semi-metal
  • B. CO₂ is an independent molecule while SiO₂ has a network covalent structure
  • C. Carbon forms acidic oxide but silicon forms basic oxide
  • D. CO₂ and SiO₂ have the same hybridization

Explanation

The correct answer is Option B. CO₂ is a linear molecule composed of discrete units, which are held together by weak van der Waals forces, making it a gas at room temperature. In contrast, SiO₂ forms a continuous network of silicon and oxygen atoms bonded covalently in a three-dimensional lattice. This extensive network structure results in a solid state at room temperature. Option A is incorrect because the metallic character of the elements does not directly influence the state of their oxides. Option C is incorrect as both oxides are acidic. Option D is incorrect because hybridization does not account for the physical state differences.

Last updated

About s-Block and p-Block Elements

The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.

Practise s-Block and p-Block Elements

1,359 free s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.

Start a free s-Block and p-Block Elements testAll s-Block and p-Block Elements MCQs

Exams that ask Chemistry questions like this

Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.

AKU Chemistry45 MCQsDUHS Chemistry45 MCQsETEA MDCAT Chemistry45 MCQsKMU Chemistry45 MCQsMDCAT Chemistry45 MCQsNUMS Chemistry40 MCQsECAT Chemistry30 MCQsETEA Engineering Admission Test Chemistry30 MCQsGIKI Chemistry30 MCQsNED Chemistry30 MCQsNET Chemistry30 MCQsPIEAS Chemistry30 MCQs

Related questions

2NaOH(aq) + Cl2(g) → NaCl + NaClO + H2O proceed at:

A compound 'X' on heating gives a colourless gas. The residue is dissolved in water to produce 'Y'. When CO₂ is passed through the aqueous solution of 'Y', it produces 'Z', which on gentle heating gives back 'X'. Compound 'X' is:

A elements are named as alkali metals because

A gas which burn with blue flame is:

A gas which burns with a blue flame is