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

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

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

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

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’?

Match the right column with the left column: Left Column Right Column 2.11.1. Noble Gas (a) Cs 2.11.2. Inver (b) Rn 2.11.3. Least electronegative element (c) Reduction with carbon 2.11.4. ZnO + C → Zn + CO (d) An alloy

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