1
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

An indicator 'X' is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with $$\mathrm{H_2O_2}$$ at room temp. The indicator 'X' forms blue coloured complex with compound 'A' present in the solution. The indicator 'X' and compound 'A' respectively are :

A
Methyl orange and $$\mathrm{H_2O_2}$$
B
Methyl orange and iodine
C
Starch and $$\mathrm{H_2O_2}$$
D
Starch and iodine
2
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A chloride salt solution acidified with dil.HNO$$_3$$ gives a curdy white precipitate, [A], on addition of AgNO$$_3$$. [A] on treatment with NH$$_4$$OH gives a clear solution B. A and B are respectively :

A
$$\mathrm{H[AgCl_3]~\&~(NH_4)[Ag(OH)_2]}$$
B
$$\mathrm{AgCl~\&~[Ag(NH_3)_2]Cl}$$
C
$$\mathrm{H[AgCl_3]~\&~[Ag(NH_3)_2]Cl}$$
D
$$\mathrm{AgCl~\&~(NH_4)[Ag(OH)_2]}$$
3
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which one amongst the following are good oxidizing agents?

A. Sm$$^{2+}$$

B. Ce$$^{2+}$$

C. Ce$$^{4+}$$

D. Tb$$^{4+}$$

Choose the most appropriate answer from the options given below :

A
C and D only
B
A and B only
C
D only
D
C only
4
JEE Main 2023 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is :

A
Co$$^{2+}$$
B
Fe$$^{2+}$$
C
Ni$$^{2+}$$
D
Cu$$^{2+}$$
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