Multiple choice question

In oxidation state there is–
(a) Gain of electrons (b) Deficiency in electrons
(c) Increase in Oxidation number (d) None of these
2 ekud gkbMªkstu bySDVªksM esa H + dk lkUnz.k gksrk gS&
(a) 0.2 M (b) 1 M/fyVj (c) 1 M (d) 0.1 M Lit –1
Concentration of H + in standard hydrogen electrode is–
(a) 0.2 M (b) 1 M/Litre (c) 1 M (d) 0.1 M Lit –1
3 fuEu esa ls fdl jklk;fud vfHkfØ;k esa vkWDlhdj.k vodj.k gks jgk gS&
In which reaction oxidation and reduction is taking place–
(a) Zn + HCl ZnCl 2 + 2H
(b) AgNO 3 + HCl AgCl + HNO 3
(c) NaOH + HCl NaCl + HOH
(d) BaCl + H2SO BaSO + HCl
2
4 4
4 fuEu esa ls Cl dh +1 vkWDlhdj.k voLFkk fdlesa gS&
(a) HCl (b) HClO 4 (c) NaCl (d) Cl 2 O
In which of the above Cl has +1 oxidation state–
(a) HCl (b) HClO 4 (c) NaCl (d) Cl 2 O
5 K 2 Cr 2 O 7 esa Cr dh vkWDlhdj.k la[;k gS&
(a) –6 (b) +6 (c) +2 (d) –2
Oxidation number of Cr in K 2 Cr 2 O 7 is–
(a) –6 (b) +6 (c) +2 (d) –2
6 fuEu esa ls fdlesa Fe dh vkWDlhdj.k la[;k U;wure gS&
Out of which oxidation number of Fe is minimum?
(a) Fe SO 4 (NH 4 ) 2 SO 4
(c) K 2 Fe O 4
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(b) Fe (CO) 5
(d) K 4 Fe (CN) 6