Answer the question on the basis of passage given below: P block elements are placed in groups 13 to 18 of the periodic table. Their valence shell electronic configuration is ns2 np1-6. Group 16 of the p block elements are known as the group of chalcogens having ns2 np4 as their general electronic configuration. They exhibit a number of oxidation states, but the stability of the -2 oxidation state decreases down the group. They are sometimes also known as the group of chalcogens as the name is derived from the Greek word for brass and points to the association of sulfur and its congeners with copper. Their ionisation enthalpy decreases down the group. Oxygen shows anomalous behaviour due to its small size and high electronegativity.
Match the oxidation state of phosphorous in the following compounds to their counter parts in List II: Choose the correct answer from the options given below:List-I List-II (A) H3PO2 (I) +3 (B) H4P2O6 (II) +5 (C) H3PO3 (III) +1 (D) H3PO4 (IV) +4
(A)-(III), (B)-(IV), (C)-(I), (D)-(II)
Explanation of the oxidation states of phosphorus in the given compounds:
- **(A) H3PO2**: Phosphorus has an oxidation state of **+1** in this compound, which corresponds to **(III)**.
- **(B) H4P2O6**: Phosphorus has an oxidation state of **+4** in this compound, which corresponds to **(IV)**.
- **(C) H3PO3**: Phosphorus has an oxidation state of **+3** in this compound, which corresponds to **(I)**.
- **(D) H3PO4**: Phosphorus has an oxidation state of **+5** in this compound, which corresponds to **(II)**.
Thus, the correct matching is **(A)-(III), (B)-(IV), (C)-(I), (D)-(II)**, which corresponds to **Option (a)**.
Important Questions from Organic Compounds Containing Nitrogen
The correct increasing order of basic strength of amine is:
(A) C₆H₅NH₂ < NH₃ < C₆H₅CH₂NH₂ < C₂H₅NH₂ < (C₂H₅)₂NH
(B) NH₃ < C₆H₅NH₂ < C₆H₅CH₂NH₂ < C₂H₅NH₂ < (C₂H₅)₂NH
(C) C₆H₅CH₂NH₂ < C₆H₅NH₂ < NH₃ < C₂H₅NH₂ < (C₂H₅)₂NH
(D) C₂H₅NH₂ < (C₂H₅)₂NH < C₆H₅NH₂ < NH₃
(E) NH₃ < C₂H₅NH₂ < C₆H₅CH₂NH₂ < (C₂H₅)₂NH < C₆H₅NH₂
Choose the correct answer from the options given below:
In which of the following molecules carbon atom marked with asterisk (*) is a stereocentre or chiral centre?
Match List-I with List-II:
List-I List-II (A) Urease (I) Maltose (B) Maltase (II) Glucose and fructose (C) Invertase (III) NH₃ and CO₂ (D) Diastase (IV) Glucose Choose the correct answer from the options given below:
Phenol is manufactured from hydrocarbon, Cumene. Cumene is chemically:
t99.9% with respect to t90% for a first-order reaction is:
