Equation Based Problem

The volume of oxygen gas (O₂) needed to completely burn 1 L of propane gas (C₃H₈) (both O₂ & propane measured at 0°C and 1 atm) will be:
1. 7 L
2. 6 L
3. 5 L
4. 10 L

What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO₃ is mixed with 50 mL of 5.8% NaCl solution? (Ag = 107.8, N = 14, O = 16, Na= 23, Cl = 35.5)
1. 28 g
2. 3.5 g
3. 7 g
4. 14 g

Suppose that the elements X and Y combine to form two compounds XY₂ and X₃Y₂. If 0.1 mole of XY₂ weighs 10 g and 0.05 mole of X₃Y₂ weighs 9 g, the atomic weight of X and Y, respectively, will be:

1.	40, 30	2.	60, 40
3.	20, 30	4.	30, 20

A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$. The evolved gaseous mixture is passed through KOH pellets.

Weight (in g) of the remaining product at STP will be:

1. 1.4

2. 3.0

3. 2.8

4. 4.4

The following solutions were prepared by dissolving 10 g of glucose (C₆H₁₂O₆) in 250 ml of water (P₁), 10 g of urea (CH₄N₂O) in 250 ml of water (P₂) and 10 g of sucrose (C₁₂H₂₂O₁₁) in 250 ml of water (P₃). The decreasing order of osmotic pressures of these solutions is:

1.	P2 > P3 > P1	2.	P3 > P1 > P2
3.	P2 > P1 > P3	4.	P1 > P2 > P3

Calculate the mass of 95% pure CaCO₃ that will be required to neutralize 50 mL of 0.5 M HCl solution according to the following reaction.
CaCO_3(s) + 2HCl_(aq) → CaCl_2(aq) + CO_2(g) + 2H₂O_(l)
[Calculate up to the second place of decimal point]

1.	9.50 g	2.	1.25 g
3.	1.32 g	4.	3.65 g

The mass of CO₂ produced by heating 20 g of 20% pure limestone, as per the equation given below, is:

1.	1.32 g	2.	1.12 g
3.	1.76 g	4.	2.64 g