Tiêu đề 8.REDOX REACTIONS-1.pdf ✅

(c) ZnS (d) CuS 6. If rod of a metal is put in a metal ion solution which is blue in colour, solution turn colorless. The metal rod and solution respectively are? NCERT Page-266 / N-238 (a) Zinc and Cu (II) (b) Zinc and Ni (II) (c) Aluminium and Cu (II) (d) Both (a) and (c) 7.3 OXIDATION NUMBER 7. The number of electrons involved in the reduction of one nitrate ion to hydrazine is NCERT/Page-277 / N-249 (a) 8 (b) 5 (c) 3 (d) 7 8. The species given below that does NOT show disproportionation reaction is : NCERT/Page- N-244 (a) BrO4 − (b) BrO− (c) BrO2 − (d) BrO3 − 9. 'Oxidation number of H in NaH, CaH2 and LiH, respectively is NCERT/Page-277 & 278 / N-240 a) +1, +1, −1 (b) −1, +1, +1 (c) +1, +1, +1 (d) −1, −1, −1 10. The oxidation number of chromium in potassium dichromate is NCERT Page-277 & 278 / N-240 (a) +6 (b) -5 (c) -2 (d) +2 11. The oxidation number of sulphur in S8,S2F2,H2S respectively, are NCERT Page N-240 (a) 0, +1 and -2 (b) +2, +1 and -2 (c) 0, +1 and +2 (d) −2, +1 and -2 12. Oxidation number of nitrogen in (NH4 )2SO4 is NCERT/Page N-240 (a) −1/3 (b) -1 (c) +1 (d) -3 13. Oxidation number of carbon in CH2Cl2 is NCERT/Page N-240 (a) -4 (b) +4