transition metals Exam

One of the following compounds its aqueous solution The chemists uses it in chemical reactions while The doctor uses in clinics.

• Fehling's solution

• MnO₂

• K₂Cr₂O₇

• KMnO₄

To make a safe for saving money, it is preferable to use …

• Titanium

• steel _ vanadium

• Iron _ Manganese

• Nickel _ Steel

aluminum is a representative element with atomic number 13 that can form alloys of certain properties with many elements.

Element A forms with it an alloy that maintains durability in even high temperatures

Element B is an alloy that resists corrosion.

Which of the following statements is true ?

• A as element used to protect the skin from sunlight

• Element B in its pure state has no uses

• It is used in very bright lamps for television photography

• B With the preceding one, resists corrosion at high temperatures

All that has a role in protection against corrosion (rust), except

• Ni

• Cr

• Mn

• Zn

Study the following figure and choose the following

• All manganese oxides are basic oxides

• scandium has both basic and acidic oxides

• Fe₂O₃ reacts with diluted acids better than FeO

• CrO reacts with diluted acids better than CrO₃

Any of the following solutions appear blue

• ScCl₃

• CrCl₃

• VCl₃

• ZnCl₂

The transitional element ion A^+x the number of electrons missing from the sublevel 4s is equal to that missing from sublevel 3d and the number of its single electrons in this case is 3 . The oxide formula in the highest oxidation state is….

• AO₂

• AO

• A₂O₇

• A₂O₅

A transition ion X⁺³ [its external electronic composition is “3d² 4s⁰, the maximum oxidation state for the element Which precedes in the same period is

• +3

• +4

• +5

• +6

A main transition element: The number of its lost electrons from sublevel 3d equals half the number of lost electrons from its sublevel 4s reach a relatively stable oxidation number, Therefore,

the transitional element that precedes it in the same horizontal row

• It is used as a catalyst in the preparation of ammonia.

• It is used in corrosion resistant alloys

• It is used as an oxidizing and disinfectant substance

• used in the detection of malignant tumors

Three sequential elements x , y ,z are located at the beginning of the first main transitional series, Arranging

them according to the radius is X < Y < Z

one of the following statements is true

• The atomic number of element Z is greater than the atomic number of element Y

• The density of element X is greater than the density of Z

• The number of single electrons in Z is greater than X

• They are all equal in density