XII Chemistry Online Mcqs - All Chapters - Online Mcqs Test - 1Chemistry Online Mcqs Test for class 12, Second Year, According to Karachi Board 300 Online Multiple Choice Questions
Q1. How many elements have been discovered so far?
Q2. Which of the following discovery resulted in a revision of the Mendeleev’s periodic law?
Q3. Who classified the then known elements into metals, nonmetals and their derivatives
Q4. In 1829, a German chemist, ____made use of the idea of relationship between atomic weights and properties of elements for the classification of elements.
Q6. “Physical and chemical properties of elements are periodic functions of their atomic weight”. This is called
Q7. Lother Mayer arranged the elements in order of their increasing atomic weights and found that
Q10. The valency, ionization energy, electron affinity and electro negativity of elements are related to its