CBSE Class 11 Chemistry Worksheet - Classification of Elements and Periodicity (2) CBSE,CCE and NCERT students can refer to the attached file. All educational material on the website has been prepared by the best teachers having more than 20 years of teaching experience in various schools. The study material available on our website for all CBSE classes and subjects have been prepared by teachers from all over the country. All study material has been carefully designed keeping into mind the latest CBSE examination trends.
Time: 30 min
Ch#3 : Classification of Elements and Periodicity in Properties -02
Full Marks: 20
1. All questions are compulsory.
2. Please give the explanation for the answer where applicable.
Q1 - How are the size of cation and anion related to corresponding neutral atoms? (2 Marks)
Q2 -Arrange the following species in decreasing order of size. Give reasons also. O2- , F-, Mg2+, Na+, N3- (3 Marks)
Q3 - Give reasons for the following
(i)The size of Ga is smaller than Al.
(ii)BF3 acts as Lewis acid.
(iii) CCl4 does not undergo hydrolysis.
(iv)PbCl2 does not react with chlorine to form PbCl4.
(v)CO is poisonous in nature. (5 Marks)
Q4 - Why IUPAC names are assigned to elements having atomic number > 100? (1 Mark)
Q5 - Give two examples of metalloids. (1 Mark)
Q6 - Electronegativity is the qualitative measure of the ability of an atom in a chemical compound to attract shared electrons towards itself.
(i) Name two scales which are used to measure the electronegativity of elements.
(ii)Name the element having highest electronegativity. (2 Marks)
Q7 - Transition metals are widely used as catalysts in many organic and inorganic reactions. Why do these metals show catalytic property? (1 Mark)
Q8 -The 1st, 2nd, 3rd and 4th ionization energies of an element are 899.5, 1757.1, 14848.7 and 21006.6 KJmol-1respectively. Name the group to which this element belongs. (3 Marks)
Q9 - Atomic number of an element is 117. Write its electronic configuration and name the group of modern periodic table in which it is placed. (2 Marks)
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