Class 11 Chemistry
Classification of Elements and Periodicity in Properties
Question1.
Given below are few statements related to Mendeleev’s Periodic table:
Which of the above statement/statements are incorrect?
Question2.
How Henry Moseley showed that the atomic number is more fundamental
property of an element than its atomic mass?
Question3.
Find out group, period & block of element having Z = 82.
Question4.
Write the IUPAC name & symbol for the element with atomic number 115?
Question5.
Why 4f- & 5f-inner transition series of elements placed separately in periodic table?
Question6.
Write the general outer electronic configuration of d-block & f-block elements.
Question7.
Question8.
Atomic radii of noble gases are measured in terms of
Question9.
Arrange the following species in increasing order of their sizes: I-, I, Cl, Br
Question10.
B has lower first Ionisation enthalpy than Be because, energy required to remove
Question11.
X(g) → X+(g) + e- Ionisation enthalpy = +320 kJ mol-1
Calculate the amount of energy required to convert 140mg of ‘X’ atom in gaseous state into X+ ion.
(1 mole of X = 7g)
Question12.
Define Ionization enthalpy. How does it vary across period and down the group in case of main group elements? Why?
Question13.
Given below are the statements related to electron gain enthalpy:
Which of the following statement/statements are incorrect?
Question14.
Question15.
Which of the following statement/statements concerning element having atomic number 11 are correct?
Options:
Question16.
Which of the following oxide is amphoteric?
Question17.
The formula of the binary compound formed by the element (Z = 56) and sulphur is
Question18.
Among the following elements C, Al, Na, and Cs, the correct order of their metallic character is:
Question19.
Question20.
Why electronegativity of any given element is not constant? Explain giving an example.
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