The number of moles of KMnO_{4} reduced by one mole of KI in alkaline medium is

(a) one fifth

(b) five

(c) one

(d) two

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What volume of oxygen gas (O_{2}) measured at $0\xb0\mathrm{C}$ and 1 atm, is needed to burn completely 1L of propane gas (C_{3}H_{8}) measured under the same conditions?

(a) 7L

(b) 6L

(c) 5L

(d) 10L

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1 g of magnesium is burnt with 0.56g of oxygen in a closed vessel. Which reactant is left in excess and how much?

(At. weight of Mg = 24, O=16)

(a) Mg, 0.16g

(b) O_{2}, 0.16g

(c) Mg, 0.44g

(d) O_{2}, 0.28g

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Number of moles of Mn${\mathrm{O}}_{4}^{-}$ required to oxidise one mole of ferrous oxalate completely in acidic medium will be

(a) 0.6 mole

(b) 0.4 mole

(c) 7.5 moles

(d) 0.2 mole

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Assuming fully decomposed, the volume of CO_{2} released at STP on heating 9.85g of BaCO_{3} [at. mass of Ba = 137] will be

(a) 1.12L

(b) 0.84L

(c) 2.24L

(d) 4.96L

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The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (at. mass of Al = 27)

(a) 180 kg

(b) 270 kg

(c) 540 kg

(d) 90 kg

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How many moles of lead (II) chloride will be formed from a reaction between 6.5g of PbO and 3.2g of HCl?

(a) 0.044

(b) 0.033

(c) 0.011

(d) 0.029

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In the reaction, 4NH_{3}(g)+ 5O_{2}(g) $\to $4NO(g) +6H_{2}O(l)

When 1 mole of ammonia and 1 mole of O_{2} are made to react to completion, then

(a) 1.0 mole of H_{2}O is produced

(b) 1.0 mole of NO will be produced

(c) all the oxygen will be consumed

(d) all the ammonia will be consumed

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12 g of Mg (atomic mass=24) will react completely with an acid to give:

(a) one mole of H_{2 }

(b) half mole of H_{2}

(c) one mole of O_{2}

(d) none of these

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A sample of pure Cu (3.18g ) heated in a stream of oxygen for some time gains in mass with the formation of black oxide of copper (CuO). The final mas is 3.92 g. What per cent of copper remains unoxidised?

(a)$\approx $6.5

(b)$\approx $6.9

(c) $\approx $7.6

(d) $\approx $7.9

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