NEET Classification of Elements and Periodicity in Properties — Set 6

Question 1

Which of the following has the smallest ionic radius?

Accepted Answer

For isoelectronic species ($\ce{O^2-}$, $\ce{F^-}$, $\ce{Na+}$, $\ce{Mg^2+}$, all with 10 electrons), radius decreases with increasing nuclear charge. $\ce{Mg^2+}$ (Z=12) has the smallest radius.

Question 2

What is the formula of the compound formed between phosphorus and oxygen in its highest oxidation state?

Accepted Answer

P (group 15, valence 5 in +5 state) forms $\ce{P2O5}$ with oxygen (valence 2), a stable acidic oxide.

Question 3

Which of the following nitrates decomposes most readily to form a basic oxide?

Accepted Answer

Group 2 nitrates decompose to basic oxides, $\ce{NO2}$, and $\ce{O2}$. $\ce{Be(NO3)2}$ decomposes most readily to $\ce{BeO}$ (basic) due to Be²⁺’s small size and high charge density, which weakens the nitrate lattice.

NEET Chemistry: Classification of Elements and Periodicity in Properties — Practice Set 6

Q1. Which of the following has the smallest ionic radius?

Q2. What is the formula of the compound formed between phosphorus and oxygen in its highest oxidation state?

Q3. Which of the following nitrates decomposes most readily to form a basic oxide?

Q4. Which element in group 13 has the lowest third ionization enthalpy?

Q5. Which element in group 17 has the lowest electron affinity?

Q6. What is the formula of the compound formed between germanium and oxygen?

Q7. Which element has the ground state electronic configuration \(1s^2 2s^2 2p^6 3s^2 3p^6 3d^6 4s^2\)?

Q8. What is the temporary systematic name of the element with atomic number 113?

Q9. What is the formula of the compound formed between boron and fluorine?

Q10. What is the formula of the compound formed between aluminium and sulfur?