NUMS MDCAT PAPER 2019

1. A laboratory experiment requires each student to use 10g of caustic soda ( NaOH ). A laboratory personnel opens a new 909 g of said salt. If 42 students took exactly the required amount of salt, how much should be left in the container at the end of the experiment

2. Sodium chloride injection is used to replenish fluid loss in the body. It usually contains 5% (w/w) NaCl. What is the mole fraction of each component in the solution

3. Yttrium barium copper oxide (YBa2Cu3O7) is a famous crystalline material ever discovered in the world of quantum physics. It becomes superconductor when it is exposed to liquid nitrogen. Calculate the mass percentage of yttrium, barium, copper, and oxygen in this compound

4. Catalytic hydrogenation of alkenes exhibits

5. Mr. peregrine Philips burned an elemental sulfur powder on a Bunsen burner and collected the smoke into a chamber. He further oxidized the gas that he collected in the chamber with catalyst. What could possible be the gas generated after oxidation

6. Phosphoric acid, H3PO4, is one of the main ingredients of soft drinks, detergents, and fertilizers. It can be prepared with a series of reactions:

Let us say we allow 1000 kg of phosphorus to react with oxygen in the tank to yield 90% of tetra phosphorus decoxide (P4O10). In the second step of the reaction, we react it with water to yield 97% of H3PO4. How much in kilogram of H3PO4. How much in kilogram of H3PO4 that was produced after series of reactions

7. Pick correct pair about the difference between E1 and E2 mechanism of methyl bromide forming an alkene.

8. Carbon monoxide is one of the products of incomplete combustion. How many bonds does carbon monoxide have

9. Which of the following is correct according to increasing boiling point

10. Gendry is a skilled blacksmith in Game of Thrones. If Gendry was to make a sword, he needed to prepare a furnace where he could heat the metal for shaping. King Robert Baratheon asked him to get a piece of metal to make him a twin-blade sword. Gendry then got a piece of metal and put it in the furnace until it glowed around 900ºC. then, he dipped it into 8 liters of water at 25ºC until the water reached a final temperature of 30ºC after shaping. What was the 7.51-mole twin-blade sword made of? The specific heat of the metal is 0.13 J/g ºC