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