Re-Exam 3 sec.

The elements at which its configuration ends with ns¹,(n-1)d¹⁰

• a. Its belongs to the last column of d block

• b. All of its Elements located in period four

• c. Belongs to group IB

• d. Consist of 10 elements

(X, Y) are transition elements in which ns sublevel not filled unless (n-1)d completely filled,. Which statement is correct:

• a. X located right to Y in modern periodic table

• b. Y located right to X in modern periodic table

• c. the maximum oxidation states of both X & Y exceed group no.

• d. a & c are correct.

X & Y belongs to first transition series if you know that X has higher density than Y; So we will expect mostly that (X) ………………….…. (Y) in chemical activity.

• a. more than

• b. less than

• c. equal

• d. can’t define

among the following series of transition metal ions, the one where all metal ions have 3d2 electronic configuration is ?

• a. Ti3+, V2+, Cr3+, Mn4+

• b. Ti+, V4+, Cr6+, Mn7+

• c. Ti4+, V3+, Cr2+, Mn+3

• d. Ti2+, V3+, Cr4+, Mn5+

When sulphate ion combine with … it gives a compound is used in purification of drinking water

• a. Titanium

• b. Chromium

• c. Copper

• d. Zinc

Which of the following is not an application of manganese alloy?

• a. It is used as a strong oxidizing agent in dry cells.

• b. It is used in airplane and car construction.

• c. It is used in the manufacture of antiseptics.

• d. It is used in the manufacture of railroad tracks and drink cans.

The common element in the following alloys is:

(MIG fighter alloy – Space shuttle’s alloy – Soft drink cans alloy)

• a. Sc

• b. Ti

• c. Mn

• d. Al

The correct order of N-compounds in its decreasing order of oxidation states is

• a. HNO₃, NO, N₂, NH₄Cl

• b. HNO₃, NO, NH₄Cl, N₂

• c. HNO₃, NH₄Cl, NO, N₂

• d. NH₄Cl, N₂, NO, HNO₃

Y & X are two elements in the first transition series each of them have only one oxidation state but it for element X is more than that of element Y so …………………………

• a. atomic radius of element X equal half atomic radius of element in group IB in the same series

• b. solutions compound YSO₄ is colored

• c. percentage of element X in earth crust is more than that of element Y

• d. magnetic moment of element X is more than that of element Y

Which one of the following elements has highest magnetic moment in oxidation +2?

• a. (Ar) 4s²,3d⁸

• b. (Ar) 4s²,3d⁴

• c. (Ar) 4s²,3d³

• d. (Ar) 4s¹,4d¹⁰