BUET Admission Test 2016-2017

1. (a) Name the shape of the following molecules.

(i) $\mathrm{BCl}_{3}$

(ii) $\mathrm{NH}_{3}$

(iii) $\mathrm{PCl}_{5}$

(b) Mention the hybridization state of the central atom in the following molecules.

(i) $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \mathrm{SO}_{4}^{2-}$

(ii) $\mathrm{SF}_{6}$

2. The conversion of cyclopropane to cyclopropene in the gas phase is a first order reaction with a rate constant of $6.7 \times 10^{-4} \mathrm{~s}^{-1}$ at $500^{\circ} \mathrm{C}$. (a) If the initial concentration of cyclopropane is $0.25 \mathrm{M}$, what is the concentration after $8.8 \mathrm{~min}$ ? (b) How long will it take for the concentration of cyclopropane to decrease from $0.25 \mathrm{M}$ to $0.15 \mathrm{M}$ ?

3. Write down the meaning of the following abbreviations:

(a) ETP

(b) MRI

(c) PPM

(d) TDS

(e) BOD

4. A movie stuntman is to run across a rooftop and jump horizontally off it to land on the roof of the next building as shown in the figure below. Before he attempts the jump, he wisely asks you to determine whether it is possible, can he make the jump if his maximum rooftop-speed is $4.5 \mathrm{~m} / \mathrm{s}$ ? What would be your advice for him? ["Jump" OR "Do not jump"]

5. (a) Name two main air pollutants emitted from each of the following industries.

(i) Cement industries

(ii) Urea industries

(iii) Leather industries

(b) What are the main raw material(s) for the following industries?

(i) Glass industrics

(ii) Ceramics industrics