UHS MDCAT 2019 PAPER

1. The structure of Xenon trioxide is shown below, With reference to the Valence shell electron pair repulsion theory, (VSEPR) the shape of Xe03 is:

2. Which two elements are isotopes?

3. According to Watson and Crick’s model of DNA, the DNA molecule consists of a double helix. What type of forces are responsible to keep two strands of DNA together?

4. An inter molecular force of attraction X is relatively stronger than the other inter molecular forces , it stabilizes a-helix and B-pleated sheets of proteins. The double helical structure of DNA is also stabilized by this force of attraction. Identify X

5. Which one of the following molecules has SP3 hybridization?

6. Oxidation number of particular element can be directly or indirectly inferred from its:

7. Which of the following sets constitutes of all the molecules and ions of non-planar geometry?

8. Nitrogen has the atomic mass of 7.

Which of the following electronic configurations is of a Nitrogen atom in ground state

9. CFC’s are organic compounds, which are derivatives of saturated hydrocarbons. They have high bond dissociation values therefore they are inert and non toxic for the living organisms. The word CFC’s stands for;

10. Amino acids are bi-functional compounds, with a general formula NH2CH(R)CO2H. A tripeptide is formed between Alanine (ala), GTycine (gly) and lysine (lys). There is no repetition of amino acid in this tri-peptide, suggest how many tri-peptides are possible?