Which of the following pair of elements represents a mole ratio of 1 : 1?(a) 10 g of calcium and 12 g of magnesium(b) 12 g of magnesium and 6 g of carbon(c) 12 g of carbon and 20 g of calcium(d) 20 g of sodium and 20 g of calcium

Academic Chemistry NCERT Class 9

Correct Answer: (b) 12 g of magnesium and 6 g of carbon

Explanation: 12 g of magnesium and 6 g of carbon will have a mole ratio of 1 : 1.

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Updated on: 10-Oct-2022

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A student wants to have 3.011 × 1023 atoms each of magnesium and carbon elements. For this purpose, he will have to weigh :(a) 24 g of magnesium and 6 g of carbon(b) 12 g of carbon and 24 g of magnesium(c) 20 g of magnesium and 10 g of carbon(d) 12 g of magnesium and 6 g of carbon
Convert into mole:(a) 12 g of oxygen gas(b) 20 g of water(c) 22 g of Carbon dioxide
If 1.4 g of calcium oxide is formed by the complete decomposition of calcium carbonate, then the amount of calcium carbonate taken and the amount of carbon dioxide formed will be respectively :(a) 2.2 g and 1.1 g (b) 1.1 g and 2.5 g (c) 2.5 g and 1.1 g (d) 5.0 g and 1.1 g
Calculate the mole ratio of 240 g of calcium and 240 g of magnesium. (Ca = 40 u ; Mg = 24 u)
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When 3.0 g of carbon is burnt in 8.00 g of oxygen, 11.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen? Which law of chemical combination will govern your answer?
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Fill in the following blanks :(a) 1 mole contains ...................... atoms, molecules or ions of a substance.(b) A mole represents an ..................... number of particles of a substance.(c) 60 g of carbon element are ................... moles of carbon atoms.(d) 0.5 mole of calcium element has a mass of ......................(e) 64 g of oxygen gas contains ....................... moles of oxygen atoms.
Ravi purchased 5 kg 400 g rice, 2 kg 20 g sugar and 10 kg 850 g flour. Find the total weight of his purchases.
Pick up the wrong pairs/combination(a) 6.022 x 1023 molecules of oxygen = 32 g of oxygen(b) 6.022 x 1023 ions of sodium = 23 g of Na(c) 6.022 x 1023 atoms of C = 24 g of carbon(d) 6.022 x 1023 atoms of H = 1 g of H atom.
Convert 12 g of oxygen gas into moles.
Find the gravitational force exerted between two objects A and \( B \), of mass \( 10 \mathrm{g} \) and \( 20 \mathrm{g} \) respectively, separated by a distance of \( 10 \mathrm{cm} \).

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