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’?

The metal which is extracted through thermal reduction is (a) Ag (b) Mg (c) Fe (d) Au

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

Match the Right column with the Left column: [1 × 4] Left column Right column 2.11.1. An alkaline earth metal (a) Fe 2.11.2. The metal which is present in the highest percentage amount in the alloy invar (b) Zn 2.11.3. An alkali metal (c) Ca 2.11.4. The metal which is given as coating to prevent the rusting of iron (d) K

Match the Right Column with the Left Column: Left Column Right Column 2.2.1 Metal present in German silver (a) Li 2.2.2 A transuranium element (b) Zn 2.2.3 The metal extracted from calamine (c) Pu 2.2.4 Alkali metal present in second period of periodic table (d) Ni

Match the items in the Left Column with the appropriate items in the Right Column: [1 × 4 = 4] Left Column Right Column 2.11.1 Most electronegative element (a) Cu 2.11.2 Extracted from hematite (b) Cl 2.11.3 The element whose anion accelerates the rusting of iron (c) F 2.11.4 The metal present in a greater percentage in the alloy brass (d) Fe

Which of the following is the formula of zine blende, an ore of zinc? ZnO Zns ZnCO3 InSO4

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

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

From which group to group 12 of the long periodic table are the transitional elements located?

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]