Some Basic Concepts of Chemistry questions
951 published questions with worked solutions.
- Mass of methane required to produce 22 g of CO₂ after complete combustion is ________ g. (Given Molar mass in g mol⁻¹ C = 12.0, H...
- Molality of 0.8 M H₂SO₄ solution (density 1.06 cm⁻³) is ________ × 10⁻³ m.
- If 50 mL of 0.5 M oxalic acid is required to neutralize 25 mL of NaOH solution, the amount of NaOH in 50 mL of given NaOH...
- A solution of H₂SO₄ is 31.4% H₂SO₄ by mass and has a density of 1.25 g/mL. The molarity of the H₂SO₄ solution is ______M (nearest...
- 0.05 cm thick coating of silver is deposited on a plate of 0.05 m² area. The number of silver atoms deposited on plate are...
- A sample of CaCO₃ and MgCO₃ weighed 2.21 g is ignited to constant weight of 1.152 g. The composition of mixture is: (Given molar...
- The molarity of 1 L orthophosphoric acid (H₃PO₄) having 70% purity by weight (specific gravity 1.54 g cm⁻³) is ________ M. (Molar...
- Number of moles of methane required to produce 22 g CO₂(g) after combustion is x × 10⁻² moles. The value of x is ________.
- The number of atoms in 8 g of sodium is x 10^ 23 . The value of x is________. (Nearest integer) [Given : N_A=6.02 10^ 23 mol^ -1...
- If 80 g of copper sulphate CuSO_4.5H_2O is dissolved in deionised water to make 5 L of solution. The concentration of the copper...
- 3Pb(NO_3)_2+Cr_2(SO_4)_3 3PbSO_4+2Cr(NO_3)_3 . 35 mL of 0.15 M lead nitrate solution is mixed with 20 mL of 0.12 M chromic...
- A 6.50 molal solution of KOH (aq.) has a density of 1.89 g cm ^ -3 . The molarity of the solution is ________ mol dm ^ -3 ....
- ———— grams of 3-Hydroxy propanal (MW=74) must be dehydrated to produce 7.8 g of acrolein (MW = 56) (C_3H_4O) if the percentage...
- 4g equimolar mixture of NaOH and Na_2CO_3 contains x g of NaOH and y g of Na_2CO_3. The value of x is _______g. (Nearest integer)
- 250 mL of 0.5 M NaOH was added to 500 mL of 1 M HCl. The number of unreacted HCl molecules in the solution after complete...
- Methylation of 10 g of benzene gave 9.2 g of toluene. Calculate the percentage yield of toluene______. (Nearest integer)
- If the concentration of glucose (C_6H_ 12 O_6) in blood is 0.72 g L^ -1 , the molarity of glucose in blood is ——— 10^ -3 M....
- The formula of a gaseous hydrocarbon which requires 6 times of its own volume of O_2 for complete oxidation and produces 4 times...
- 4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is x 10^ -1 ....
- The density of NaOH solution is 1.2 g cm^ -3 . The molality of this solution is ______m. (Round off to the Nearest Integer) [Use...
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