Chemistry - 9 Chapter - 4Periodicity of Elements and Periodic TableTest - 26

Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 26

1. What is Pico meter?

a) 10^-12 part of a meter
b) 10^-13 part of a meter
c) 10^-14 part of a meter
d) 10¹² part of a meter

2. Why atom as a whole is neutral?

a) Similar charge of electrons and protons
b) Opposite charge of electrons and neutron cancel each other
c) Opposite charge of electrons and protons cancel each other

3. All transition elements are metals and they have different characteristics.

a) False
b) True

4. Atoms of some non-metals have a tendency to gain an electron in their outermost shell and become ______ ion.

a) Positive
b) Negative

5. Define electron affinity?

a) The amount of energy absorbed out when an electron is absorbed in the outermost electronic shell of an isolated gaseous atom. Its units are KJ mol^-1
b) The amount of energy given out when an electron is absorbed in the outermost electronic shell of an isolated gaseous atom. Its units are KJ mol^-1

6. Define first ionization energy?

a) The minimum amount of energy required to remove an electron from the outer most electronic shell of an isolated gaseous atom. Its units are KJ mol^-1
b) The maximum amount of energy required to remove an electron from the outer most electronic shell of an isolated gaseous atom. Its units are KJ mol^-1

7. If one electron has been removed from an atom it will become?

a) Positive ion
b) Negative ion

8. In any period, electron affinity gradually increases across the period?

a) From right to left
b) From left to right

9. What is a negative ion?

a) Negative ion is an atom or group of atoms which has gained one or more electrons and due to this have become negatively charged.
b) Negative ion is an atom or group of atoms which has gained only one electrons and due to this have become negatively charged.

10. What is a positive ion?

a) Positive ion is an atom or groups of atoms which has lost one or more electrons and due to this have become negatively charged.
b) Positive ion is an atom or groups of atoms which has lost one or more electrons and due to this have become positively charged.

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