SINDH MDCAT 2019 ( PART 3) 1. Which of the following gases Is used for welding purposes? Propane Ethene Ethane Ethyne 2. The chief ore of Aluminum is: Na3AlF6 Al203.nH2O Al203.H20 Al203 3. Sp3 hybrid orbitals are formed by the mixing of: One s and two p One s and one p One s and three p Two s and two p 4. Which one of the following bond has highest bond energy’ H-F Carbon triple bond Nitrogen triple bond C=C 5. Diamond is a bad conductor because it: Has no free electron In crystal Is transparent to light Has a tight structure Has high density 6. Ethers show the phenomenon of: Cis-trans isomerism Position isomerism Metamerism Functional group isomerism 7. Metallic character of the elements: Decreases across the periods Decreases down the groups Increases across the periods Increases down the groups 8. The nature of positive rays depends on The nature of the electrode The nature of the residual gas The nature of the discharge tube The shape of the electrode 9. The net heat change in a chemical reaction is same whether it is brought about in two or more different ways in one or several steps. It Is known as: Dalton’s law Hess’s law Henry’s law Joule’s principle 10. The volume occupied by 1.4 g N2 at STP is: 1.4 dm^3 22.4 dm^3 11.2 dm^3 1.12 dm^3 Loading … Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
