Q1. 20 mL of sodium iodide solution gives 4.74 g of silver iodide when treated with excess silver nitrate solution. The molarity of the sodium iodide solution is ______ M. (Nearest integer value)
Q2. A 0.05 cm thick coating of silver is deposited on a plate of area 0.05 m². The number of silver atoms deposited on the plate is ______ × 10²³. (Atomic mass Ag = 108, density = 7.9 g cm⁻³)
Q3. The mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess dilute HCl is:
Q4. Molality of an aqueous solution of urea is 4.44 m. The mole fraction of urea in the solution is x × 10⁻³. The value of x is ______. (Integer answer)
Q5. X g of ethylamine is subjected to reaction with NaNO₂/HCl followed by water. The evolved nitrogen gas occupies 2.24 L at STP. X is ______ × 10⁻¹ g.
Q6. X g of benzoic acid on reaction with aqueous NaHCO₃ released CO₂ gas which occupied 11.2 L at STP. The value of X is ______ g.
Q7. The molality (m) of a 3 M aqueous solution of NaCl is ______. (Density of solution = 1.25 g mL⁻¹)
Q8. 0.01 mole of an organic compound containing 10% hydrogen on complete combustion produced 0.9 g of H₂O. The molar mass of the compound is ______ g mol⁻¹.
Q9. 10 mL of 2 M NaOH is added to 20 mL of 1 M HCl. Then 10 mL of this mixture is transferred to a 100 mL volumetric flask containing 2 moles of HCl and diluted to the mark. The resulting solution is:
Q10. Concentrated nitric acid is labelled as 75% by mass. The volume (in mL) of the solution which contains 30 g of nitric acid is ______. (Density = 1.25 g mL⁻¹)