MCQ
Starch paper is used to test for the presence of
- ✓Iodine
- BOxidising agent
- CIodide ion
- DReducing agent
✓
Answer
Correct option: A.
Iodine
(a) Starch paper are used for iodine test as:
${{I}^{-}}+\text{oxidant }\xrightarrow{{}}{{I}_{2}}$
${{I}_{2}}+\text{starch}\xrightarrow{{}}\text{blue colour}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Amongst $LiCl, RbCl, BeCl_2$ and $MgCl_2$ the compounds with the greatest and the least ionic character, respectively are:
→Some of the Group $2$ metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is:
→$1\,mol$ of oxygen gas are heated at constant volume from $20\,^oC$ to $30\,^oC$ . What will be change in the internal energy of gas? Molar heat capacity of oxygen at constant pressure, $ C_P= 7.03\,cal\,mol^{-1}\,K^{-1}$ and $R = 2\,cal\,mol^{-1}\,K^{-1}$ ? .....$cal$
→Crude sodium chloride is generally obtained by crystallisation of:
Consider the following conversions
$(i)\, O(g) + e^-\to O^-(g) ; \Delta H_1$
$(ii)\, F(g) + e^-\to F^-(g) ; \Delta H_2$
$(iii)\, Cl(g) + e^-\to Cl^-(g) ; \Delta H_3$
$(iv)\, Na(g) \to Na^+(g) ; \Delta H_4$
incorrect statement is :-
→$(i)\, O(g) + e^-\to O^-(g) ; \Delta H_1$
$(ii)\, F(g) + e^-\to F^-(g) ; \Delta H_2$
$(iii)\, Cl(g) + e^-\to Cl^-(g) ; \Delta H_3$
$(iv)\, Na(g) \to Na^+(g) ; \Delta H_4$
incorrect statement is :-
Which pair of atomic numbers represents $s$-block elements
→The following pair of compounds is best described as
The oxidation state of each oxygen atom in $N{a_2}{O_2}$ is
→The formula of $3$ membered discrete chain silicate is
→The oxidation number of chlorine atom in bleaching powder is :