In which group of the long periodic table, elements of all three physical states - gaseous, liquid and solid are present? [1] OR To which group of the long periodic table do the alkali metals belong? [1]

Arrange F, I, Br, CI in decreasing order of electronegativity

Match the Right column with the Left column : [1 × 4 = 4] Left Column Right Column 2.11.1 Acetic acid (a) non-conductor of electricity 2.11.2 Glass (b) Weak electrolyte 2.11.3 Most electro-negative element (c) Krypton 2.11.4 One Noble Element (d) Fluorine

Number of groups in the long periodic table is (a) 9 (b) 13 (c) 18 (d) 19

Mention similarity of properties of hydrogen with two properties of group 17 elements of long periodic table.

The first three elements of group 16 of long periodic table are O, S, and Se. Arrange them in the order of decreasing atomic radius, increasing electro-negativity and decreasing ionization energy. [1 + 1 + 1]

Why are the elements of group 2 of the long periodic table called alkaline earth metals? [2] OR Give example of a transitional element and a transuranic element. [2]

If the elements are arranged in ascending order of their electropositivity, then choose the correct order (a) C < N < 0 < F (b) C > N > 0 > F (c) O < N < C < F (d) F > C > O > N

How many elements are there in the fourth period of long periodic table? 8 32 16 18

How many groups are there in the modern long form of the periodic table? (a) 7 (b) 17 (c) 15 (d) 18

If the atomic number of an element is 19, in which group of the modern periodic table is the element placed? (a) Group 1 (b) Group 2 (c) Group 18 (d) Group 9

What is meant by ionisation energy of an atom of an element? Arrange Na, Rb, Li and Cs in the increasing order of their ionisation energy. OR The atomic numbers of the elements ‘A’, ‘B’ and ‘C’ are (n-2), n, (n+1) respectively, ‘B’ is an inert gas. In which group of the Periodic Table are ‘A’ and ‘C’ located? Which one among them has the highest reductive power? What is the formula of the compound produced by combining ‘A’ and ‘C’?