1
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
The oxidation states of Cr in [Cr(H2O)6]Cl3, [Cr(C6H6)2] and K2[Cr(CN)2(O)2(O2)(NH3)] respectively are :
A
+3, 0 and +4
B
+3, +4 and +6
C
+3, +2 and +4
D
+3, 0 and +6
2
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
The compound that does not produce nitrogen gas by the thermal decomposition is :
A
(NH4)2SO4
B
Ba(N3)2
C
(NH4)2Cr2O7
D
NH4NO2
3
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
Consider the following reaction and statements:
[Co(NH3)4Br2]+ + Br- $$\to$$ [Co(NH3)3Br3] + NH3
(I) Two isomers are produced if the reactant complex ion is a cis-isomer
(II) Two isomers are produced if the reactant complex ion is a trans-isomer
(III) Only one isomer is produced if the reactant complex ion is a trans-isomer
(IV) Only one isomer is produced if the reactant complex ion is a cis – isomer
The correct statements are
A
(II) and (IV)
B
(I) and (II)
C
(I) and (III)
D
(III) and (IV)
4
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting
[3Ca3 (PO4)2.Ca(OH)2] to
A
[3{Ca(OH)2}. CaF2]
B
[CaF2]
C
[3(CaF2). Ca(OH)2]
D
[3Ca3(PO4)2. CaF2]
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