Classification of Elements and Periodicity in Properties

The atomic number of the element from the following with lowest 1st ionisation enthalpy is :

1. 32
2. 35
3. 19
4. 87

Choose the incorrect trend in the atomic radii (r) of the elements.

1. rRb < rCs
2. rAt < rCs
3. rBr < rK
4. rMg < rAl

Which of the following statements are correct? Choose the correct answer from the options given below:

1. A, C and D Only
2. B and C Only
3. B and D Only
4. B, C and E Only

Match the LIST-I with LIST-II Choose the correct answer from the options given below:

1. A-IV, B-I, C-II, D-III
2. A-IV, B-III, C-I, D-II
3. A-III, B-I, C-IV, D-II
4. A-II, B-III, C-IV, D-I

Electronic configuration of four elements A, B, C and D are given below: (A) 1s2 2s2 2p3 (B) 1s2 2s2 2p4 (C) 1s2 2s2 2p5 (D) 1s2 2s2 2p2 Which of the following is the correct order of increasing electronegativity (Pauling's scale)?

1. D < A < B < C
2. A < B < C < D
3. A < C < B < D
4. A < D < B < C

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

1. Statement I is incorrect but Statement II is correct
2. Both Statement I and Statement II are correct
3. Statement I is correct but Statement II is incorrect
4. Both Statement I and Statement II are incorrect

The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is :

1. AO
2. AO2
3. A2O
4. A2O3

First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value for the element that is a main component of apatite family :

1. 834 kJ mol-1
2. 947 kJ mol-1
3. 1402 kJ mol-1
4. 1012 kJ mol-1

The incorrect decreasing order of atomic radii is

1. Si > P > Cl > F
2. Mg > Al > C > O
3. Al > B > N > F
4. Be > Mg > Al > Si

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are false
2. Statement I is false but Statement II is true
3. Statement I is true but Statement II is false
4. Both Statement I and Statement II are true