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1
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Out of Syllabus

Given are $$\mathrm{H}_3 \mathrm{PO}_2, \mathrm{H}_3 \mathrm{PO}_3, \mathrm{H}_3 \mathrm{PO}_4$$ and $$\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7$$. Which of the above oxacids results into two series of salts?

A
$$\mathrm{H}_3 \mathrm{PO}_2$$
B
$$\mathrm{H}_3 \mathrm{PO}_3$$
C
$$\mathrm{H}_3 \mathrm{PO}_4$$
D
$$\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7$$
2
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Out of Syllabus

The order of acidic strength of boron trihalides is

A
$$\mathrm{BI}_3<\mathrm{BBr}_3<\mathrm{BCl}_3<\mathrm{BF}_3$$
B
$$\mathrm{BF}_3<\mathrm{BCl}_3<\mathrm{BBr}_3<\mathrm{BI}_3$$
C
$$\mathrm{BBr}_3<\mathrm{BCl}_3<\mathrm{BF}_3<\mathrm{BI}_3$$
D
$$\mathrm{BCl}_3<\mathrm{BBr}_3<\mathrm{BI}_3<\mathrm{BF}_3$$
3
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0
Out of Syllabus

Give the correct order of acidity of

A
HClO$$_4$$ < HClO$$_3$$ < HClO$$_2$$ < HClO
B
HClO < HClO$$_2$$ < HClO$$_3$$ < HClO$$_4$$
C
HClO$$_4$$ < HClO$$_2$$ < HClO < HClO$$_3$$
D
HClO < HClO$$_3$$ < HClO$$_2$$ < HClO$$_4$$
4
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0
Out of Syllabus

The cololur of CrO$$_4^{2-}$$ changes to Cr$$_2$$O$$_7^{2-}$$ is

A
yellow to orange
B
orange to yellow
C
yellow to blue
D
orange to blue
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