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Hydrogen — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrogen5 Marks
Question
  1. Arrange the following in decreasing order of stability.
$\text{PH}_3,\text{NH}_3,\text{AlH}_3,\text{SbH}_3,\text{BiH_3}$

$\text{CH}_4,\text{H}_2\text{O},\text{NH}_3,\text{HF}$
  1. Which negative catalyst prevent decomposition of $H_2O^2$?
  2. What happens when.
  1. $H_2O_2$ is added to acidified $K_2Cr_2O_7$?
  2. Benzene reacts with $H_2O_2$ in presence of $FeSO_4$ as catalyst.
Write chemical reactions involved.
✓

Answer

  1.  
  1. $NH_3 > PH_3 > AsH_3 > SbH_3 > BiH_3$
As atomic size of central atom increases, stability of hydrides decreases.
  1. $CH_3 NH_3< H_2O < HF$
As atomic size of central atom decreases electronegative increases, stability increase
  1. Acetanilide or phosphoric acid or glycerol prevent decomposition of $H_2O_2$.
  2. Blue coloured chromium peroxide, $CrO_5$ is formed.
  1. $\text{K}_2\text{Cr}_2\text{O}_7+\text{H}_2\text{SO}_4+4\text{H}_2\text{O}\\\xrightarrow{\ \ \ \ \ \ \ \ }2\text{CrO}_5+\text{K}_2\text{SO}_4+5\text{H}_2\text{O}$
  2. Phenol is formed.

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