1
JEE Advanced 2019 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1
Change Language
The green colour produced in the borax bead test of a chromium (III) salt is due to
A
Cr2O3
B
CrB
C
Cr(BO2)3
D
Cr2(B4O7)3
2
JEE Advanced 2017 Paper 2 Offline
MCQ (Single Correct Answer)
+3
-0.75
Change Language
Which of the following combination will produce $${H_2}$$ gas ?
A
Fe metal and conc. $$HN{O_3}$$
B
$$Cu$$ metal and conc. $$HN{O_3}$$
C
$$Zn$$ metal and $$NaOH(aq)$$
D
Au metal and $$NaCN\left( {aq} \right)$$ in the presence of air
3
JEE Advanced 2016 Paper 2 Offline
MCQ (Single Correct Answer)
+3
-1
Change Language

In the following reaction, sequence in aqueous solution, the species X, Y and Z, respectively, are

$${S_2}O_3^{2 - }\buildrel {A{g^ + }} \over \longrightarrow \mathop X\limits_{Clear\,solution} \buildrel {A{g^ + }} \over \longrightarrow \mathop Y\limits_{White\,precipitate} \buildrel {With\,time} \over \longrightarrow \mathop Z\limits_{Black\,precipitate} $$

A
[Ag(S2O3)2]3$$-$$, Ag2S2O3, Ag2S
B
[Ag(S2O3)2]5$$-$$, Ag2SO3, Ag2S
C
[Ag(SO3)2]3$$-$$, Ag2S2O3, Ag
D
[Ag(SO3)3]3$$-$$, Ag2SO4, Ag
4
JEE Advanced 2013 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

Upon treatment with ammoniacal H2S, the metal ion that precipitates as a sulphide is

A
Fe(III)
B
Al(III)
C
Mg(II)
D
Zn(II)
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