1st Year Chemistry Chapter 4 Test04. Stoichiometry

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. The reactant that is completely consumed during a reaction is called:
   1. Non-limiting reactant
   2. Excess reactant
   3. Limiting reactant
   4. Catalyst
2. Which sample produces most hydrogen by reaction with excess of ?
   1. 0.25 mol Ca
   2. 0.25 mol Al
   3. 0.25 mol Zn
   4. 0.25 Na
3. How much volume of $NH_3$ gas produced when 3g$H_2$ react with excess of $N_2$ at STP.
   1. $24dm^3$
   2. $2.24dm^3$
   3. $2.4dm^3$
   4. $1.2dm^3$
4. The SI unit of amount of substance is:
   1. Gram
   2. Mole
   3. Liter
   4. Atom
5. When 1 mole of each of the following is completely burnt in oxygen, which will give the greater mass of $CO_2$?
   1. CO
   2. Diamond
   3. Ethane
   4. Methane
6. The molarity (M) of a solution is defined as:
   1. Moles of solute × volume of solution
   2. Mass of solute / volume of solvent
   3. Volume of solute / dm³ of solvent
   4. Moles of solute / dm³ of solution
7. The reactant that remains unreacted after the completion of reaction is called:
   1. Limiting reactant
   2. Solvent
   3. Catalyst
   4. Non-limiting
8. If 3 moles of Ca react with 1 mole of $N_2$, then 1 mole of $N_2$ produces:
   1. 1 mole $Ca_3N_2$
   2. 3 moles $Ca_3N_2$
   3. 0.33 mole $Ca_3N_2$
   4. 0.457 mole $Ca_3N_2$
9. In the reaction $2H_2+O_2→2H_2O$, when 1 mole of each $H_2$ and $O_2$ are mixed, the limiting reactant is:
   1. $H_2$
   2. $O_2$
   3. $H_2O$
   4. Both react completely
10. The equation for percent yield is:
    1. Percent yield = (Theoretical yield/Actual yield)×100
    2. Percent yield = (Actual yield/Theoretical yield)×100
    3. Percent yield = Actual yield×Theoretical yield×100
    4. Percent yield = Theoretical yield-Actual yield×100