Some Basic Concepts of Chemistry

The volume of ethyl alcohol ( density 1.15 g/cc) that has to be added to prepare 100 cc of 0.5 M ethyl alcohol solution in water is 

• 1.15 cc

• 2 cc

• 2.15 cc

• 2.30 cc

If the molecular wt. of Na₂SO₃ and I₂ are M₁ and M₂ respectively then what will be the equivalent weight of Na₂SO₃ and I₂ in the following reaction?

2S₂O${}_3^{2-}$ + I₂ → S₄O${}_6^{2-}$ + 2I^-

• M₁, M₂

• M₁, M₂ /2

• 2M₁, M₂

• M₁, 2M₂

The normality of 30 volume H₂O₂ is

• 2.678 N

• 5.336 N

• 8.034 N

• 6.685 N

The volume strenght  of 1.5 N H₂O₂ solution is 

• 16.8L

• 8.4L

• 4.2L

• 5.2L

19.85 mL of 0.1 N NaOH reacts with 20 mL of HCl solution for complete neutralisation. The molarity of HCl solution is

• 9.9

• 0.99

• 0.099

• 0.0099

The molality of solution containing 15.20 g of urea, (molar mass = 60) dissolved in 150 g of water is

• 1.689 mol kg^-1

• 0.1689 mol kg^-1

• 0.5922 mo kg^-1

• 0.2533 mol kg^-1

The volume of neon gas in cm³ at STP having the same number of atoms as that present in 800 mg of Ca is (At. mass : Ca = 40 g mol^-1, Ne = 20 g mol^-1)

• 448

• 896

• 224

• 112

The mole fraction of methanol is in 4.5 molal aqueous solution is

• 0.250

• 0.125

• 0.100

• 0.075

A mixture of ethane and ethene occupies 41 L at 1 atm and 500 K. The mixture reacts completely with $\frac{10}{3}$mole of O₂ to produce CO₂ and H₂O. The mole fraction of ethane and ethene in the mixture are respectively (R = 0.082 L atm K^-1 mol^-1)

• 0.50, 0.50

• 0.75, 0.25

• 0.67, 0.33

• 0.25, 0.75

Which of the following pairs of substances would give same gaseous product on reaction with water?

• Na and Na₂O₂

• Ca and CaH₂

• Ca and CaO

• Ba and BaO₂