Which of the following statements is true regarding the reaction given below?
\(2 \mathrm{Al}_{(\mathrm{s})}+6 \mathrm{HCl}_{(\mathrm{aq})} \rightarrow 2 \mathrm{Al}^{3+}{ }_{(\mathrm{aq})}+6 \mathrm{Cl}^{-}_{(\mathrm{aq})}+3 \mathrm{H_2}_{\mathrm({g})}\)

1.	6 L HCl(aq) is consumed for every 3L of H2(g) produced.
2.	33.6 L H2(g) is produced regardless of temperature and pressure for every mole of Al that reacts.
3.	67.2 L H2(g) at STP is produced for every mole of Al that reacts.
4.	11.2 L H2(g) at STP is produced for every mole of HCl(aq) consumed.

Two solutions of a substance (non electrolyte) are mixed in the following manner.
480 mL of 1.5 M first solution +520 mL of 1.2 M second solution.
What is the molarity of the final mixture?

1. 2.70 M

2. 1.344 M

3. 1.50 M

4. 1.20 M

How many moles of magnesium phosphate, Mg₃(PO₄)₂, contain 0.25 moles of oxygen atoms?

\(6.02\times10^{20}\) molecules of urea are present in 100 mL of its solution. The concentration of urea solution is:
(Avogadro constant, \(N_A=6.02\times10^{23}~mol^{-1}\))

1. 0.001 M

2. 0.01 M

3. 0.02 M

4. 0.1 M

To neutralize 20 mL of 0.1 M aqueous solution of phosphorus acid \((H_3PO_3) \) completely, the volume of 0.1 M aqueous KOH solution required is:

The mass of potassium dichromate crystals required to oxidize 750 cm³ of 0.6 M Mohr's salt solution is:
(Given molar mass: potassium dichromate = 294, Mohr's salt = 392)

1. 0.45 g

2. 22.05 g

3. 2.2 g

4. 0.49 g

3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is :

1.  18 mg

2.  36 mg

3.  42 mg 

4.  54 mg

The molarity of a solution obtained by mixing 750 mL of 0.5M HCl with 250 ml of 2M HCl will be:

1. 1.75 M

2. 0.975 M

3. 0.875 M

4. 1.00 M

What is the ratio of the number of molecules of oxygen to nitrogen in a specific gaseous mixture if their mass ratio is 1:4?