Element Y forms an ion Y 3- with the electronic configuration 2, 8, 8.To which group and period of the periodic table does Y belong? Answer: 2) C The (-3)…

A compound of iodine and oxygen contains 63.5g of iodine and 20.0g of oxygen. Which of the following would be its formula? Answer: 2) E We need to use the…

Compound T has a melting point of 78 °C and a boiling point of 134 °C. T is soluble in water and its solution does not conduct electricity. T has…

You are told that three different gas jars contain carbon dioxide, hydrogen and oxygenrespectively.Which single method of testing for gases will enable you to identify all three gases? Answer: 2)…

The right-angled triangle shown has horizontal and vertical sides measuring (4 + √2) cm and(2 - √2) cm respectively. Calculate the area of the triangle. Answer: 2) B Area of…

The mass of an atom of uranium is 4
10-25 kg.What is the mass, in milligrams, of 8 million atoms of uranium? Answer: 2) E Mass of 8×10⁶ uranium…