phase 2 registration neet

Concept of actaves was proposed by 1. Mosley 2. Mendeleef 3. Newlands 4. Pettenkofer

Which of the following is not a triad 1. S, Se, Te 2. Fe, Co, Ni 3. Li, Na, k 4. Na, Mg, Al

Group of Li, Na, K are called 1. Metals 2. Alkaline earth metals 3. Inactive metals 4. Triad

Which of the following group of elements are triad 1. Na, Ne, k 2. Cl, Br, I 3. Li, Fe, Ni 4. C, N, O