Limiting Reagent or Reactant

Q.

1 gm of magnesium is burnt with 0.56gm of O2 in a closed vessel.Which reactant is left in excess and how much

Q.

How much copper is obtained from 100g of copper sulphate

Q.

How much copper can be obtained from 100g of copper sulphate (cuso4).

Q.

27g Al reacts completely with how many grams Oxygen.

Q. Aluminium reacts with chlorine gas to form aluminium chloride via the following reaction:
$2Al+3C{l}_2\to 2AlC{l}_3$
How many grams of aluminium chloride could be produced from 34 g of aluminium and 39 g of chlorine gas?

1. 90.53 g
2. 48.86 g
3. 75.23 g
4. 24.36 g

Q. Ethane$\left(C_2{H}_6\right)$ reacts with oxygen gas to produce carbon dioxide and water. Initially,
5 mol of ethane is burned with 16 mol of oxygen, find the amount of carbon dioxide produced when the yield of the reaction is 60 %.
$2C_2{H}_6+7O_2\to 4C{O}_2+6H_{2}O$

1. 10.46 mol
2. 9.14 mol
3. 13.25 mol
4. 5.48 mol

Q.

One mole of Calcium phosphide on reaction with excess water gives:

1. $1\mathrm{mol}$ Of Phosphine

2. $2\mathrm{mol}$ Of Phosphine

3. $2\mathrm{mol}$ Of Phosphoric Acid

4. $1\mathrm{mol}$ Of Phosphorus Pentaoxide

Q. Mass of sucrose $\left(C_{12}{H}_{22}{O}_{11}\right)$ produced by mixing 84 g of carbon, 12 g of hydrogen and 56 $L$ $O_2$ at 1 atm & 273 K according to given reaction, is $C\left(s\right)+H_2\left(g\right)+O_2\left(g\right)\to C_{12}{H}_{22}{O}_{11}\left(s\right)$

1. 138.5
2. 155.5
3. 172.5
4. 199.5

Q.

Hemoglobin Contains 0.25% Iron By Mass. The Molecular Mass Of Hemoglobin Is 89600. Calculate The Number Of Iron Atoms Per Molecule Of Hemoglobin.

[$\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{Fe}=56$]

Q. For the combustion of sucrose:
$C_{12}{H}_{22}{O}_{11}+12O_2\to 12C{O}_2+11H_{2}O$
10.0 g of sucrose and 10.0 g of oxygen are made to react. Which of the following reactants will be the limiting reagent and what amount of the excess reactant will be left?

1. Sucrose; 5.02 g
2. Sucrose; 2.53 g
3. Oxygen; 1.09 g
4. Oxygen; 5.02 g

Q.

A metal chloride contain 47.22% metal.Calculate the equivalent weight of metal.

Q.

Calculate the total number of nucleons present in 12 g of carbon-12.

Q.

How to identify zero oder, first, second order and third order reactions?

Q. $2A+3B\to 4C+5D$
Starting with 7 moles of $A$, 6 moles of $B$. Find the moles of $C$ and $D$ formed respectively.

1. $9\text{mol},11.25\text{mol}$

2. $12\text{mol},15\text{mol}$

3. $8\text{mol},10\text{mol}$

4. $14\text{mol},17.5\text{mol}$

Q.

Air contains $23\%$ of oxygen and $77\%$of nitrogen by weight. What is the percentage of oxygen by volume is?

Q.

46. Write the molecular equation for the following word equation.
$\mathrm{Aluminium}+\mathrm{Oxygen}\to \mathrm{Aluminium}\mathrm{oxide}$

Q.

Zinc and hydrochloric acid react according to the reaction $\mathrm{Zn}\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to \mathrm{ZnCl}\left(\mathrm{aq}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$. If $0.40\mathrm{mol}\mathrm{Zn}$ are added to hydrochloric acid containing $0.62\mathrm{mol}\mathrm{HCl}$, how many moles of ${\mathrm{H}}_2$ are produced?

Q. Electrolysis of dilute aqueous $NaCl$ solution was carried out by passing $10\text{mA}$ current. The time required ( in seconds) to liberate 0.01 mole of $H_2$ gas at the cathode is $x\times {10}^{4}s$. Find the value of $x$. $(1F=96500{\text{C mol}}^{-1})$.

Q.

KBr contains 32.9% by weight of potassium. If 6.40 g of bromine reacts with 3.60 g of potassium, calculate the number of moles of potassium which combine with bromine to form KBr.

Q. For the reaction A->B, doubling the concentration of both the reactants increases the reaction rate by 8 times and doubling the concentration of only B simply doubles the reaction rate. Find the rate law for the above equation.

Q.

In a chemical reaction, x + 2 y z, if the rate of appearance of z is 0.50 moles per litre per hour, then the rate of disappearance of y is

1. 0.25 mol L^-1 hr^-1

2. - 1.0 mol L^-1 hr^-1

3. Cannot be predicted

4. 0.5 mol L^-1 hr^-1

Q.

The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction $2A+4B\to 3C+4D,$ when 5 moles of A react with 6 moles of B, then

(i) Which is the limiting reagent ?

(ii) Calculate the amount of C formed ?

Q. 2.4 kg of carbon is made to react with 1.35 kg of aluminium to form $A{l}_4{C}_3.$ The maximum amount of aluminium carbide formed is:

1. 5.44 kg
2. 3.75 kg
3. 1.05 kg
4. 1.80 kg

Q. A reaction container holds 5.77 g of $P_4$ and 5.77 g of $O_2$ and the following reaction occurs: $P_4+O_2\to P_4{O}_6.$ The amount of excess reagent left is?

1. 10.51 g
2. 2.84 g
3. 20.32 g
4. 1.31 g

Q.

What is the difference between sulphur and sulphate?

Q.

The ratio of active masses of $22\mathrm{g}$ of ${\mathrm{CO}}_2$, $3\mathrm{g}$ of ${\mathrm{H}}_2$ and $7\mathrm{g}$ of ${\mathrm{N}}_2$ in a gaseous mixture:

1. $22:3:7$

2. $0.5:3:7$

3. $1:3:1$

4. $1:3:0.5$

Q. Which of the following statements about the order of reaction is true?

1. A second order reaction is also bimolecular
2. The order of a reaction can only be determined by experiment
3. The order of a reaction increases with increase in temperature
4. The order of a reaction can be determined from the balanced equation

Q. Nitric acid can be neutralized by any base to form a salt and water, as in the following equation: $Mg(OH{)}_2+2HN{O}_3\to Mg(N{O}_3{)}_2+2H_{2}O$
What amount of magnesium nitrate salt will be formed by the reaction of 250 g of magnesium hydroxide and 250 g of nitric acid?

1. 294 g
2. 318 g
3. 147 g
4. 636 g

Q. In a process for producing acetic acid, oxygen gas is bubbled into acetaldehyde, $C{H}_{3}CHO,$ under pressure at ${60}^{\circ }C$ in the presence of a suitable catalyst.
$2C{H}_{3}CHO+O_2\to 2C{H}_{3}COOH$
In a laboratory test of this reaction, 20 g $C{H}_{3}CHO$ and 10 g $O_2$ were put in a reaction vessel. If the actual yield is 23.8 g, calculate the percentage yield.

1. 88.15 %
2. None of these
3. 75.26 %
4. 65.28 %

Q. Calculate the number of NaBr formula units formed when 50 $NB{r}_3$ molecules and 57 NaOH formula units are made to react?
$2NB{r}_3+3NaOH\to N_2+3NaBr+3HOBr$

1. 50
2. 57
3. 23
4. 25