Some Basic Concepts of Chemistry

In a flask, the weight ratio of CH₄ (g) and SO₂ (g) at 298K and 1 bar is 1 : 2. The ratio of the number of molecules of SO₂ (g) and CH₄ (g) is

• 1 : 4

• 4 : 1

• 1 : 2

• 2 : 1

You are supplied with 500 mL each of 2N HCl and SN HCL What is the maximum volume of 3M HCl that you can prepare using only these two solutions?

• 250 mL

• 500 mL

• 750 mL

• 1000 mL

What will be the normality of the salt solution obtained by neutralising x mL y (N) HCl with y mL x(N) NaOH, and finally adding (x + y) mL distilled water

• $\frac{2(\mathrm{x} + \mathrm{y})}{\mathrm{xy}} \mathrm{N}$

• $\frac{\mathrm{xy}}{2(\mathrm{x} + \mathrm{y})}\mathrm{N}$

• $\left(\frac{2\mathrm{xy}}{\mathrm{x} + \mathrm{y}}\right) \mathrm{N}$

• $\left(\frac{\mathrm{x} + \mathrm{y}}{\mathrm{xy}}\right)\mathrm{N}$

At a particular temperature, the ratio of equivalent conductance to specific conductance of a 0.01 N NaCl solution is

• 10⁵ cm³

• 10³ cm³

• 10 cm³

• 10⁵ cm²

Commercial sample of H₂O₂ is labeled as 10 V. Its % strength is nearly

• 3

• 6

• 9

• 12

The system that contains the maximum number of atoms is

• 4.25 g of NH₃

• 8 g of O₂

• 2g of H₂

• 4g of He

Which one of the following is wrong about molecularity of a reaction?

• It may be whole number or fractional

• It is calculated from reaction mechanism

• It is the number of molecules of the reactants taking part in a single step chemical reaction

• It is always equal to the order of elementary reaction

The amount of the heat released when 20 mL 0.5 M NaOH is mixed with 100 mL 0.1 M HCl is × kJ. The heat of neutralisation is

• -100 x kJ/mol

• -50 x kJ/mol

• + 100 x kJ/mol

• +50 x kJ/mol

2 g of metal carbonate is neutralised completely by 100 mL of 0.1 N HCl. The equivalent weight of metal carbonate is

• 50

• 100

• 150

• 200

The weight of oxalic acid that will be required to prepare a 1000 mL (N/20) solution is

• 126/100 g

• 63/40 g

• 63/20 g

• 126/20 g