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M+ is an unknown metal cation with +1 charge. A student dissolved the Iodide of unknown metal (Chemical Formula=MI) in enough water to make it 100 ml of solution. The student then mixes the solution with excessive AgNO3 solution, causing Silver Iodide to precipitate. The student collects the precipitate by filteration, dried it, and recorded the data as below: (The molar mass of Silver Iodide =235 g/mol)
Mass of Metal iodide compound MI = 1.66 g
Mass of Filter Paper = 0.901 g
Mass of Filter paper and AgI precipitate = 3.25 g
What is the identity of Metal Iodide compound? (Year 2020)
Complete combustion of a sample of hydrocarbons in excessive oxygen produces equimolar quantities of water and carbon dioxide. Which of the following is the molecular formula of the compound? (Year 2020)
The element is B because it has three electrons in the outermost shell.
The element is B because it has five electrons in the outermost shell.
The element is N because it has three electrons in the outer most shell.
The element is N because it has five electrons in the outermost shell.
144 pm with 419 KJ/mol
144 pm with 633 KJ/mol
196 pm with 419 KJ/mol
196 pm with 633 KJ/mol
A student has a 1g sample of each of the following compounds: NaCl, KBr, and KCl. Which of the following lists the samples in order of increasing number of moles in the sample? (Year 2018)
How many carbon atoms are contained in 2.8 g of C2H4 ?
1.2 x 10^23
3.0 x 10^23
6.0 x 10^23
1.2 x 10^24
6.0 x 10^24
A student obtains a sample of a pure solid compound. In addition to Avogadro’s number, which of the following must the student know in order to determine how many molecules are in the sample? (Year 2019)
Mass of the sample, volume of the sample
Mass of the sample, density of the sample
Molar mass of the compound, mass of the sample
Molar mass of the compound, density of the sample
Consider atoms of the following elements. Assume that the atoms are in the ground state. The atom that contains only one electron in the highest occupied energy sublevel (Year 2018)
Which of the following ground-state electron configurations represents the atom that has the lowest first-ionization energy? (Year 2020)
1s2 2s2 2p6 3s1
1s2 2s2 2p6
How many electrons can the 2nd energy level hold ? (Year 2018)