1.

The atomic weights of two elements A and B are 20 and 40 respectively. Which of the following statements are correct for these two elements?

Answer»

x g of A contains y ATOMS which is EQUAL to atoms present in x g of B.
x g of A contains y atoms which is equal to atoms present in 2x g of B.
At STP, x L of monoatomic gas A is equal to xL of monoatomic gas B.
At STP, x L of monoatomic gas A weighs y g and y g monoatomic gas B has volume xy.

Solution :Atomic WEIGHT
`underset(1 mol)(20)A underset(1 mol)underset(40)B`
Suppose 10 g of A = 1/2 mol of A = 1/2 mol of B = 20 g of B = 2x g of B
Hence, XG of A and 2x g of B will contain same number of atoms.
x L of A = yg
Suppose, 11.2 mL of A = 1/2 mol of A = 10 g of A
`=x/2` L of B at STP


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