1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

Hall- Heroult's process is given by
A
Cu2+ (aq) + H2(g) $$ \to $$ Cu(s) + 2H+ (aq)
B
Cr2O3 + 2AI  $$ \to $$ Al2O3 + 2Cr
C
2Al2O3 + 3C  $$ \to $$ 4Al + 3CO2
D
ZnO + C   $$\buildrel {Coke,\,1673\,K} \over \longrightarrow $$ Zn + CO

Explanation

In Hall-Heroult's process is given by

At cathode :- $$4Al_{\left( \ell \right)}^{3 + }{\mkern 1mu} {\mkern 1mu} + {\mkern 1mu} {\mkern 1mu} 12{e^ - }{\mkern 1mu} {\mkern 1mu} \,\mathrel{\mathop{\kern0pt\longrightarrow} \limits_\,} \,\,4Al\left( \ell \right)$$

At Anode :- $$6O_{\left( \ell \right)}^{2 - }\,\,\mathrel{\mathop{\kern0pt\longrightarrow} \limits_\,} \,\,3{O_2}(g) + 12{e^ - }$$

$$3C + 3{O_2}\,\,\mathrel{\mathop{\kern0pt\longrightarrow} \limits_\,} \,\,3C{O_2}\left( \uparrow \right)$$
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

Wilkinson catalyst is : (Et = C2H5)
A
[(Ph3P)3 RhCl]
B
[(Et3P)3RhCl]
C
[(Et3P)3IrCl]
D
[(Ph3P)3IrCl]

Explanation

Wilkinsion catalyst is [(Ph3P)3RhCl]
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Morning Slot

The element that usually does NOT show variable oxidation states is :
A
V
B
Cu
C
Sc
D
ti

Explanation

Sc3+ has noble gas configuration hence only +3 exists.

Most common oxidation states of :
(i) Sc : +3
(ii) V : +2, +3, +4, +5
(iii) Ti : +2, +3, +4
(iv) Cu : +1, +2
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Evening Slot

The hydride that is NOT electron deficient
A
B2H6
B
AlH3
C
GaH3
D
SiH4

Explanation

SiH4 has complete octet hence it is not an electron deficient hydride.

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