Chemistry - 9 Chapter - 4Periodicity of Elements and Periodic TableTest - 25

Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 25

1. S², p⁵ (7 electron) in outer most shells means tendency to acquire
__________ more electron.

a) 4
b) 2
c) 1
d) 3

2. s², p⁵ configuration in outermost shells means?

a) 7 electron
b) 2 electron
c) 5 electron
d) 3 electron

3. The physical and chemical properties of elements depend upon the size of their _______.

a) Proton
b) Nucleus
c) Neutron
d) Atom

4. What is meant by catalyst?

a) A substance that increases the rate of a chemical reaction while itself undergoing any change
b) A substance that decreases the rate of a chemical reaction without itself undergoing any change
c) A substance that increases the rate of a chemical reaction without itself undergoing any change
d) Two answers are correct

5. why 2s¹, 2f² is a wrong statement?

a) Because "f" cannot occur in Ist orbit (L-shell) as "f" belongs to fifth orbit (N-shell)
b) Because "f" cannot occur in Ist orbit (L-shell) as "f" belongs to fourth orbit (N-shell)
c) Because "f" cannot occur in second orbit (L-shell) as "f" belongs to fourth orbit (N-shell)

6. why 2s³, 2p⁷ is a wrong statement? Short..Answer...............................................

a) Because "s" sub shell can have only one electron and "p" only five, not three or seven.
b) Because "s" sub shell can have only two electrons and "p" only six, not three or seven
c) Because "t" sub shell can have only two electrons and "p" only six, not three or seven.
d) Because "s" sub shell can have only one electron and "p" only six, not three or seven.

7. Write the electronic configuration of its outermost shell of the element having 3 shells and 6 electrons in outer most shell.

a) 3s² 3p⁴
b) 3s³ 3p⁴
c) 3s² 3p⁶
d) 3s⁶ 3p⁶

8. Write the symbol, name and atomic number of element having 3 shells and 6 electrons in outer most shell.

a) Sulphur, "s", atomic number 18.
b) Sulphur, "s", atomic number 6
c) Sulphur, "s", atomic number 16.

9. What is meant by "all elements of group 1A have s¹ configuration in their outer shells"?

a) It means that inner most shell has only one electron
b) It means that outer most shell has only one electron
c) It means that outer most shell has two electrons

10. What is nanometer (Nm)? Short..Answer............................................................

a) 10^-9 part of a meter
b) 10^-8 part of a meter
c) 10^-7 part of a meter
d) 10⁹ part of a meter

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