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

2.

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

Which of the following salts will not undergo hydrolysis?

• NH₄Cl

• KCN

• KNO₃

• Na₂CO₃

The heat of neutralisation of a strong acid and a strong alkali is 57.0 kJ mol^-1.The heat released when 0.5 mole of HNO₃ solution is mixed with 0.2 mole of KOH is 

• 57.0 kJ

• 11.4 kJ

• 28.5 kJ

• 34.9 kJ

The solubility product of ${\mathrm{Ag}}_2{\mathrm{CrO}}_4 \mathrm{is} 32 \times {10}^{-12}$. What is the concentration of ${\mathrm{CrO}}_4^{2-}$ ions in that solution?

• $2 \times {10}^{-4}$

• $16 \times {10}^{-4}$

• $8 \times {10}^{-4}$

• $12\times {10}^{-4}$

₉₀Th²²⁸ emits four alpha and one beta particles. Number of neutrons in daughter element is

• 129

• 190

• 232

• 138

One atomic mass is equal to

• $1.66 \times {10}^{-27} \mathrm{g}$

• $1.66 \times {10}^{-24} \mathrm{g}$

• $1.66 \times {10}^{-23} \mathrm{g}$

• $1.66 \times {10}^{25} \mathrm{g}$

The heat of combustion of carbon is - 393.5 kJ/mol. The heat released upon the formation of 35.2 g of CO₂ from carbon and oxygen gas is

• + 315 kJ

• - 31.5 kJ

• - 315 kJ

• + 31.5 kJ

The atomic number of Sn is 50. The shape of gaseous SnCl₂ molecule is

• Cl-Sn-Cl

• 

• 

• 

The central carbon atom of a free radical contains

• 6 electrons

• 7 electrons

• 8 electrons

• 10 electrons