TestUstad
Moderate

Ca (Z=20) forms an ionic bond with CI (Z=17). What is the chemical formula of calcium chloride?

Correct answer: B. CaCl₂

  • A. CaCl
  • B. CaCl₂
  • C. Ca2CI2
  • D. Ca2CI

Explanation

The electronic configuration of Ca is 1s2 2s2 2p6 3s2 3p6 4s2 3d10. Since, calcium has 20 electrons, it can lose 2 electrons to attain electronic configuration of argon to attain stability. So it will lose 2 electrons from its outermost subshell i.e., 4s2 Ca → Ca2+ + 2e- The electronic configuration of Cl is 1s2 2s2 2p6 3s2 3p5. Since chlorine is 17 electrons, it can gain 1 electron to to attain electronic configuration of argon to attain stability. So it will gain 1 electron. Cl + 1e- → Cl-. Since, Calcium loses 2 electrons, so 1 electron will be gained by one chlorine atom and other by 2 chlorine atom. So 1 calcium ion will bind with 2 chloride ions. Ca2+ + 2Cl- → CaCl2 Hence, option B is correct.

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