NEET Chemistry Some Basic Concepts in Chemistry Stoichiometric Calculations MCQs

A mixture of $KClO_3$ and $KCl$ weighing 4.96 g was heated to produce $O_2$. The evolved oxygen occupied 448 mL at STP. What percent of the original mixture was $KClO_3$?

10 g of a mixture of $NaHCO_3$ and $Na_2CO_3$ has 1.68 g of $NaHCO_3$. On heating, if the residue weighs 8.28 g, what is the percentage purity of $Na_2CO_3$ in the mixture?

A 2.00 g sample of a mixture of $CaCO_3$ and $CaSO_4\cdot2H_2O$ was heated to a constant mass of 1.55 g. What percent by mass of the original sample was $CaCO_3$?

A 1.00 g sample containing $BaCl_2\cdot2H_2O$ is heated to a constant mass of 0.835 g. What was the mass percent of barium in the original sample?

25 mL of a mixture of $NaOH$ and $Na_2CO_3$ solution requires 20 mL of 0.5 N $HCl$ using phenolphthalein as an indicator. Another 25 mL of the same mixture requires 30 mL of the same $HCl$ solution when methyl orange is used as an indicator. Calculate the ratio of normalities of $NaOH$ and $Na_2CO_3$ in the mixture.

What volume of oxygen at STP is required to completely burn 3.2 g of methane?

10 g of calcium carbonate ($CaCO_3$) on heating produces how many grams of calcium oxide ($CaO$)? (Atomic masses: Ca = 40, C = 12, O = 16)

How many moles of $CO_2$ are produced when 2 moles of propane ($C_3H_8$) are completely combusted in excess oxygen?

What is the limiting reagent when 2 moles of $H_2$ react with 1 mole of $O_2$ to form water?

If 4 g of NaOH is dissolved in 250 mL of water, what is the molarity of the solution?