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Q.1) Oxidction numbers of Cl atoms marked as CI‘ and CI° in CaOCls, , (bleaching powder) are, a. zero in each b. +1 in Cl’ and +1 in Cl®, c. +1 in Cand -1 in CIP d. 1 in each, Q.2) Which is the correct stock notation for magenese dioxide ?, a. Mn(1)O2 b. Mn(IDO2, c. Mn(IIDO>2 d. Mn(IV)O2, Q.3) Which of the following halogens does always show oxidation state -1 ?, a.F b. Cl c. Br dt, Q.4) The process, SO2 —+ S2Cl: is, a. Reduction b. Oxidation, , c. Neither oxidation nor reduction d. Oxidation and reduction., Q.5) Oxidation number of H in AIH; is... ......, a.+l b. -1 c. +3 d. zero, Q.6) Oxidation number of oxygen in Oy? ion is, a. +2 b. -2 c.-1 d. zero, Q.7) In the conversion of K2Cr207 to K2Cr0z, the oxidation number of chromium, a) Remains same b) Increases, c) Decreases d) None, Q.8) One of the following has both positive and negative oxidation states, a) F b) Cl, c)He d) Na, Q.9) Nitrogen has highest oxidation State in, a) NO2 b) N20 c) N> d) NH3, Q.10) The Oxidation number of nitrogen in N2Os, a) -5 b)+5 c)O d)+1, Q.11) The oxidation number of Mn in KMn0Oz is, a) +7 b)-7 c)-1 d)+1, Q.12) Select the compound in which chlorine is assigned oxidation number + 7, a) HCIO4 b) HCIO2 c) HCIO3 d) HCI, Q.13) Oxidation number of iron in potassium ferrocyanide is, a) +1 b) +4 c) +3 d)+2

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Q.14) In which of the following compounds, carbon is in the lowest oxidation, state?, A) CH, (B) CFs (C) COz (D) CCl, , Q.15) Inthe reaction, 2Na + C12 2NaCl,, , (A) Na gets oxidized while C12 gets reduced, , (B) Na gets reduced while C12 gets oxidized, , (C) only Na gets reduced, , (D) only Cl gets oxidised, , Q.16) Oxidation number of carbon in carbon suboxide (C302) is, (A) +2/3 (B) +4/3 (C) +4 (D) —4/3, Q.17) The oxidation number of the underlined element in KeP20;is, a. +3 b. -5 c.+5 d. +6, Q.18) The oxidation number of Mn is +7 in, (A) manganese dioxide (B) manganese chloride, (C) manganese sulphate (D) potassium permanganate, Q.19) Identify the element that can have highest oxidation number., a.N b.O ce. Cl d.c, Q.20) Oxidation state of oxygen in F20 is, a. +1 b. -1 c.+2 d. +2, Q.21) The oxidation states of iodine in Hl0s, H3105 and Hs|0¢ are respectively., a. +1 43,47 b. +7,47,47 c. + 2,+7,+7, d. +3, +7,42, Q.22) Oxidation state Of Fe in F304 iS..., (A) +2/3 (B) +4/3 (C) + 8/3 (D) —4/3, Q.23) If HNO3 changes into N20, the oxidation number is changed by, a. +3 b. -5 c.+4 d. +6, Q.24) Which is the best description of the behaviour of bromine in the reaction, given below?, H20 + Br ——, HOBr+HBr, (A) Oxidised only. (B) Reduced only., (C) Proton acceptor only. (D) Both oxidised and reduced., Q.25) Inthe rusting of iron 4Fe+302 _ + 2Fe203, Fe is, a) oxidised b) reduced c) hydrolysed b) reduced d) precipitate