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Class XI Chemistry Mole concept and Stoichiometry 1

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Question 1

Number of atoms of He in 100 amu of He (atomic wt. of He is 4) are

Question 2

60 g of a compound on analysis gave 24 g of C, 4 g of H and 32 g of O. The empirical formula of the compound is

Question 3

If we consider that 1/6, in place of 1/12; mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Question 4

The average molecular mass of a mixture of gas containing nitrogen and carbon dioxide is 36. The mixture contain 280 gm of nitrogen, therefore, the amount of CO₂ present in the mixture is -

Question 5

‘a’ moles of X reacts with ‘b’ moles of Y according to the reaction in which the stoichiometric ratio of X:Y equals to c:b where (a > c), then quantity left behind after complete reaction is

Question 6

if water sample is taken and it contained hydrogen and oxygen in ratio 1:8. This indicates law of:

Question 7

12g carbon combines with 64g sulphur to form CS₂. 12 g carbon also combines with 32g oxygen to form CO₂. 10g sulphur combines with 10g oxygen to form SO₂. this data illustrates:

Question 8

Which has maximum number of atoms?

Question 9

The mass of oxygen that would be required to produce enough CO, which completely reduces 1.6 kg Fe₂O₃ (at. mass Fe = 56) is -
(Fe₂O₃ + 3CO → 2Fe + 3CO₂)

Question 10

Total number of molecules in 22.4 L each of H₂O, Cl₂ & NH₃ at STP would be in the order.

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Sep 23JEE & BITSAT