كيمياء تحليلية سوال

[zainab1414]

السلام عليكم ورحمة الله وبركاته ممكن احد يشرحلي هل سوال Which of the following elements will convert Cr3+ to Cr metal?
Mg
Co
Pb
Ag
None of these will convert Cr3+ to Cr.

 

[w.mortada]

السلام عليكم
to convert Cr +3 to Cr you should use reducing agent, Non of the selected elements were reducing agent
أرجو أن أكون قد أفادتك

 

[w.mortada]

السلام عليكم ورحمة الله وبركاته ممكن احد يشرحلي هل سوال Which of the following elements will convert Cr3+ to Cr metal?
Mg
Co
Pb
Ag
None of these will convert Cr3+ to Cr.

to convert Cr +3 to Cr you should use reducing agent, Non of the selected elements were reducing agent
أرجو أن أكون قد أفادتك

Source : http://books.arabsbook.com/threads/%D8%B3%D9%88%D8%A7%D9%84.98666/#ixzz1fUKD5760​

 

[ali-alavi]

dear friend​

the answer is Mg​

to reduce the Cr3+ to Cr the other metal should have less standard reduction potential than Cr. the standard reduction potential of cr3+/cr is -0.74 and for Mg2+/Mg , Co2+/Co , Pb2+/pb are -2.37 , -0.28, -0.13 respectivly. so only Mg can reduce the Cr3+ to Cr​

 

[chemistry]

بارك الله فيكم وأصلح حالكم​