Periodic Table

1. The periodic classification of the elements is an arrangement of the elements in order of their (a) atomic weights (b) isotonic weighs (c) molecular weights (d) atomic numbers
Right Choice: Option D

2. Indicate which of the following statements is not true as we move from left to right along the periodic table (a) atomic number of elements increases (b) atomic mass of elements increase (c) electropositive character of element increases (d) electronegative character of element increases
Right Choice: Option C

3. Sodium and potassium belongs to the same group of the periodic table. This is because 9a0 both are metals (b) both are soft and lighter than water (c) both form cations by losing electrons (d) both react with water vigorously
Right Choice: Option D

4. An element is electronegative if (a) it has a tendency to exist in the gaseous form (b) it ions dissolve readily in water (c) it has a tendency to loss electrons (d) it has tendency to gain electrons
Right Choice: Option *

5. As the difference in electronegativity between bonded atoms increases, polarity of the bond (a) decreases (b) increases (c) remains unchanged (d) reduces to zero
Right Choice: Option D

6. Which of the following physical properties decreases across the Periodic table (a) ionization potential (b) electron affinity (c) electronegativity (d) atomic radius
Right Choice: Option D

7. The energy change accompanying the addition of an electron to a gaseous atom is called 9a0 first ionization energy (b) second ionization energy (c) electron affinity (d) electronegativity
Right Choice: Option B

EXERCISE

8. Which of the following electron configuration indicates an atom with the highest ionization energy? 9a) 2, 8, 7 (b) 2, 8, 8 , 1 (c) 2, 8, 8, 2 (d) 2, 8, 8, 7

9. A decrease in atomic size and an increase in nuclear charge across a period will lead to (a) a decrease in covalency in bond formation (b) an increase in chemical reactivity (c) an increase in the tendency to lose electrons (d) a decrease in the electro positivity

10. X(g)  X(g) The type of energy involved in the above transformation is 9a) ionization energy (b) sublimation (c) lattice energy (d) electron affinity

11. In the periodic table what is the property that decreases along the period and increase down the group(a) atomic number (b) electron affinity (c) ionization potential (d) atomic radius

12. In order to remove one electron from a 3s-orbital of gaseous sodium atom. About 496KJmol-1 of energy is required. The energy is referred to as (a) electron affinity (b) ionization energy (c) activation energy (d) electronegativity

13. Given that electronegativity increase across a period and decrease down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond? (a) HF(g) (b) NH3(g) (c) CH4(g) (d) HCl(g)

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