Question

The Pacific Coaching Center

Prepared By Syed Junaid Ali

M.SC (chemistry), M.Sc. (Env. Studies), M.Phil. (Industrial Chemistry)

1. Element A belongs to Group VII in p-block and element B belongs to Group I in s-block of the periodic table. Out of the

following assumptions, the correct one is :

(a) A and B are metals (b) A and B are non-metals

(c) A is a metal and B is a non-metal (d) A is a non-metal and B is a metal

2. The lightest liquid metal is

(a) Hg (b) Ga

(c) Cs (d) Fr

3. Which of the following elements A, B, C, D and E with atomic number 3, 11, 15, 18 and 19 respectively belong to the same

group?

(a) A, B, C (c) B, C, D

(c) A, D, E (d) A, B, E

4. An element having electronic configuration 1s2

, 2s22p6

, 3s23p6

, 4s1

forms

(a) Acidic oxide (b) Basic oxide

(c) Amphoteric oxide (d) Neutral oxide

5. An element which is an essential constituent of all organic compounds belongs to

(a) Group 1 (b) group 14

(c) Group 15 (d) group 16

6. As per the modern periodic law, the physical and chemical properties of elements are periodic functions of their

(a) Atomic volume (b) electronic configuration

(c) Atomic weight (d) atomic size

7. Eka-aluminium and Eka-silicon are known as

(a) Gallium and Germanium (b) Aluminum and Silicon

(c) Iron and Sulphur (d) Manganese and Magnesium

8. The most significant contribution towards the development of periodic table was made by

(a) Mendeleev (b) Avogadro

(c) Dalton (d) Cavendish

9. Mendeleev’s periodic law is based on

(a) Atomic number (b) atomic weight

(c) Equivalent weight (d) valency

10. The statement that is not true for the long form of the periodic table is

(a) It reflects the sequence of filling electrons in the order of sub-energy levels s, p, d and f.

(b) It helps to predict the stable valence states of the elements

(c) It reflects trends in physical and chemical properties of the elements

(d) It helps to predict the relative ionicity of the bond between any two elements

11. Which of the following pairs of atomic numbers represents elements belonging to the same group?

(a) 11 and 20 (b) 12 and 30

(c) 13 and 31 (d) 14 and 33

12. Which of the following sets of atomic number belong to that of alkali metals?

(a) 1, 12, 30, 4, 62 (b) 37, 19, 3, 55

(c) 9, 17, 35, 53 (d) 12, 20, 56, 88

13. What is the atomic number of the next halogen if discovered?

(a) 85 (b) 117

(c) 167 (d) 104

14. All the elements of a group in the periodic table have the same

(a) Atomic weight (b) number of protons

(c) Mass number (d) number of electrons for bonding

15. The elements in which 4f orbitals are progressively filled up are called as

(a) Actinides (b) transition elements

(c) Lanthanides (d) halogens

16. Which of the following is not a transition metal?

(a) Zr (b) Tc

(c) Re (d) Np

17. Which of the following have same number of electrons in the outermost orbit?

(a) Pb, Sb (b) N, O

(c) As, Bi (d) P, Ca

18. Representative elements belong to

(a) s- and p-blocks (b) p- and d-blocks​

Answer 1

Answer:

4) We have given an element which has the electronic configuration as the 1s22s22p63s23p64s1 . The given elements have the 4s as the outer orbital. ... The element is potassium K. The potassium forms potassium oxide K2O .