Chemistry · Classification of Elements and Periodicity in Properties

Match List-I with List-II: List-I List-II A \( \text{Na}_2\text{O} \) with water I Forms a strong base \( 2\text{NaOH} \) B \( \text{Cl}_2\text{O}_7 \) with water II Forms a strong acid \( 2\text{HClO}_4 \) C Maximum covalency of Boron III Equal to \( 4 \) due to absence of \( d \)-orbitals D Oxidation state of Al in \( [\text{AlCl}(\text{H}_2\text{O})_5]^{2+} \) IV Equal to \( +3 \) while its covalency is \( 6 \) Choose the correct answer from the options given below:

1. A
   A-(IV), B-(III), C-(II), D-(I)
2. B
   A-(II), B-(I), C-(IV), D-(III)
3. C
   A-(III), B-(IV), C-(I), D-(II)
4. D
   A-(I), B-(II), C-(III), D-(IV)