A1. What is the total number of electrons in the ion 56Fe2+? A2. Which substance has an ionic bond? A3. What is

A1. What is the total number of electrons in the ion 56Fe2+?
A2. Which substance has an ionic bond?
A3. What is the hybridization of the carbon atom in the molecule of pentane?
A4. Which are the formulas of amphoteric oxides?
A5. Which class does 2-methylbutanal belong to?
A6. What does potassium hydroxide not react with?
A7. What is the substance H3C-CH-CH2-OH?
A8. Which atom has the largest radius?
A9. Which is a sulfate ion reactant?
A10. Which interaction is represented by the shortened ionic equation NH4+ + OH- = NH3 + H2O?
A11. In which of the aqueous solutions does phenolphthalein turn pink?
A12. Which sequence enhances reducing properties?
A13. Why does aniline exhibit fewer basic properties compared to other amines?
A14. Which reaction is an oxidation-reduction reaction?
A15. How does increasing the concentration of SO3 affect the equilibrium of the reaction 2SO2 + O2 ↔ 2SO3?
B1. Which of the listed substances belong to the class of alkenes?
B2. Which substance is the reducing agent in the oxidation-reduction reaction CrCl3 + KNO3 + K2CO3 → K2CrO4 + KNO2 + CO2 + KCl?
B3. Which condition would shift the chemical equilibrium of the reaction N2 + 3H2 ↔ 2NH3 + Q to the right?
B4. Indicate the reason for the reaction proceeding to completion by matching the reaction equation with the characteristic.
B5. What color does the indicator litmus turn when added to a solution of sodium carbonate?
C1. Calculate the mass of the precipitate formed during the reaction between a 20% solution of copper(II) chloride weighing 67.5 g and a 25% solution of sodium hydroxide weighing 16 g, considering a practical yield of 80% compared to the theoretical yield.
C2. Perform the series of transformations: P → P2O5 → H3PO4 → AlPO4 → Al(OH)3 → Al2O.