1
JEE Main 2022 (Online) 29th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

When borax is heated with $$\mathrm{CoO}$$ on a platinum loop, blue coloured bead formed is largely due to :

A
$$\mathrm{B}_{2} \mathrm{O}_{3}$$
B
$$\mathrm{Co}\left(\mathrm{BO}_{2}\right)_{2}$$
C
$$\mathrm{CoB}_{4} \mathrm{O}_{7}$$
D
$$\mathrm{Co}\left[\mathrm{B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right]$$
2
JEE Main 2022 (Online) 29th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Dinitrogen is a robust compound, but reacts at high altitudes to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is :

A
$$\mathrm{NO}$$
B
$$\mathrm{NO}_{3}^{-}$$
C
$$ \mathrm{NO}_{2}$$
D
$$\mathrm{NO}_{2}^{-}$$
3
JEE Main 2022 (Online) 28th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

White phosphorus reacts with thionyl chloride to give :

A
$$\mathrm{PCl}_{5}, \mathrm{SO}_{2}$$ and $$\mathrm{S}_{2} \mathrm{Cl}_{2}$$
B
$$\mathrm{PCl}_{3}, \mathrm{SO}_{2}$$ and $$\mathrm{S}_{2} \mathrm{Cl}_{2}$$
C
$$\mathrm{PCl}_{3}, \mathrm{SO}_{2}$$ and $$ \mathrm{Cl}_{2}$$
D
$$\mathrm{PCl}_{5}, \mathrm{SO}_{2}$$ and $$ \mathrm{Cl}_{2}$$
4
JEE Main 2022 (Online) 28th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Concentrated $$\mathrm{HNO}_{3}$$ reacts with Iodine to give :

A
HI, $$\mathrm{NO}_{2}$$ and $$\mathrm{H}_{2} \mathrm{O}$$
B
$$\mathrm{HIO}_{2}, \mathrm{~N}_{2} \mathrm{O}$$ and $$\mathrm{H}_{2} \mathrm{O}$$
C
$$\mathrm{HIO}_{3}, \mathrm{NO}_{2}$$ and $$\mathrm{H}_{2} \mathrm{O}$$
D
$$\mathrm{HIO}_{4}, \mathrm{NO}_{2}$$ and $$\mathrm{H}_{2} \mathrm{O}$$
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