The calculated mass of ₂₀Ca⁴⁰ is 40.328 u. It releases 306.3 MeV energy in a nuclear process. Its isotopic mass is

• 39.998

• 40.6570

• 0.3290

• 2.85 × 10⁴

Which of the following concentration factors is affected by change in temperature?

• Molarity

• Molality

• Mole fraction

• Weight fraction

An aqueous solution of urea containing 18g urea in 1500 cm³ of the solution has a density equal to 1.052. If the molecular weight of urea is 60, the molality of the solution is

• 0.200

• 0.192

• 0.100

• 1.200

What volume of 2M H₂SO₄ is required to form 0.2 N of 100 mL of solution?

• 5 mL

• 20 mL

• 10 mL

• 50 mL

How many gram-equivalents of NaOH are required to neutralise 25 cm³ of a decinormal HCl solution?

• 0.00125

• 0.0025

• 0.0050

• 0.025

1 mol alcohol reacts with Na to give what weight of hydrogen ?

• 1 gm

• 2 gm

• 3 gm

• 3.5 gm

One atomic mass is equal to

• $1.66 \times {10}^{-27} \mathrm{g}$

• $1.66 \times {10}^{-24} \mathrm{g}$

• $1.66 \times {10}^{-23} \mathrm{g}$

• $1.66 \times {10}^{25} \mathrm{g}$

1 u (amu) is equal to

• 1.492 × 10^-10 J

• 1.492 × 10^-7 J

• 1.492 × 10^-13 J

• 6.023 × 10²³ J

450 mg of glucose is dissolved in 100 g of solvent. What is the molality of solution?

• 0.0025 m

• 0.025 m

• 0.25 m

• 2.5 m

2.5 cm³ of 0.2 M H₂SO₄ solution is diluted to 0.5 dm³. Find normality of the diluted solution?

• 0.2 N

• 0.02 N

• 0.002 N

• 0.04 N