| A, B and C are hydroxy compounds of the elements P, Q and R respectively. P, Q and R are in the same period of the periodic table. A gives an aqueous solution of \[pH>7\]. B reacts with both strong acids and strong alkalies. C gives an aqueous solution which is strongly alkaline. Which of the following statement(s) is/are true? |
| I. All the three elements are metals. |
| II. The atomic radius decreases in the order P, Q, R. |
| III. The electron negativities decrease from P to Q to R. |
| IV. P, Q and R could be \[P,Al\] and Na respectively. |
A) I, II and IV
B) III and IV only
C) II, III and IV
D) All are correct
Correct Answer: B
Solution :
[b]| Idea Students are advised to solve the problem by using the concept of nature of hydroxides of element and electronegativity of elements. |
| [Keep in mind the all elements in 3rd period and their electronegativity order] |
| (iv) Na, P and Al all the three belong to (iii) period. |
| (iii) Electronegativities of P < Q < R |
| Hydroxy compound of phosphorous \[={{H}_{3}}P{{O}_{4}}=A\] (which is acidic so \[pH<7\]) |
| \[Al{{(OH)}_{3}}\] is amphoteric in nature \[=B\] |
| \[NaOH\] is strongly alkaline \[=C\] |
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