HARD
11th CBSE
IMPORTANT
Earn 100

Reaction of Br2 with Na2CO3 in aqueous solution gives sodium bromide and sodium bromate with evolution of CO2 gas. The number of sodium bromide molecules involved in the balanced chemical equation is

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Important Questions on Some Basic Concepts of Chemistry

HARD
11th CBSE
IMPORTANT
If the value of Avogadro's number is 6.023 x 1023 mol-1 and the value of Boltzmann constant is 1.380 x 10-23 JK-1, then the number of significant figures in the calculated value of the universal gas constant is
HARD
11th CBSE
IMPORTANT
Three moles of B2H6 are completely reacted with methanol. The number of moles of boron containing product formed is
HARD
11th CBSE
IMPORTANT

The ammonia prepared by treating ammonium sulphate with calcium hydroxide is completely used by NiCl2.6H2O to form a stable coordination compound. Assume that both the reactions are 100 % complete. If 1584 g of ammonium sulphate and 952 g of NiCl2.6H2O are used in the preparation, the combined weight (in grams) of gypsum and the nickel-ammonia coordination compound thus produced is _____. (Atomic weights in g mol-1: H = 1, N = 14, O = 16, S = 32, Cl= 35·5, Ca= 40, Ni= 59)