General Science MCQ – 15 (Chemistry)

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1. The number of electron dots in the Lewis symbol for an element equals the?
(A) Number of outermost s and p electrons
(B) Number of outermost s electrons
(C) Number of outermost p electrons
(D) Period number that contains the element

2. Calculate the pressure f 0.55 mol of NH₃ gas in a 2.00 L vessel at 25^o C, using the ideal gas law?
(A) 6.4 atm
(B) 6.5 atm
(C) 6.7 atm
(D) 6.3 atm

3. A steel tank contains carbon dioxide at 34^o C and is at a pressure of 13.0 atm. Determine the internal gas pressure when the tank and its contents are heated to 100^o C?
(A) 16.8 atm
(B) 15.8 atm
(C) 14.8 atm
(D) 13.8 atm

4. Deviations from the ideal gs law are less at?
(A) Low temperatures and low pressure
(B) Low temperatures and high pressure
(C) High temperatures and low pressure
(D) High temperatures and high pressure

5. A mixture of three gases has a pressure of 1380 mmHg at 298 K. The mixture is analyzed and is found to contain 1.27 mol CO2, 3.04 mol CO, and 1.50 mol Ar. What is the partial pressure of Ar?
(A) 456 mm Hg
(B) 356 mm Hg
(C) 355 mm Hg
(D) 455 mm Hg

6. Which of the following exhibits the most hydrogen bonding?
(A) H₂S
(B) CH₄
(C) LiH
(D) NH₃

7. Which of the following carbon compounds has the highest melting points?
(A) CI₄
(B) CH₄
(C) NH₃
(D) CF₄

8. Water has such a high specific heat because?
(A) It dissolves both ionic and covalent compounds
(B) It is rather dense
(C) It has many relatively strong hydrogen bonds
(D) The O-H single bond has a high bond energy

9. The triple point is?
(A) The point on a phase diagram where solid, liquid and gas are in equilibrium
(B) The coordinates of a point on a phase diagram
(C) An end to the liquid-gas line in a phase diagram
(D) The three pieces of data needed to solve the Clausius- clapeyron equation

10. Main forces responsible for the structure of DNA are?
(A) Ionic bonds and covalent bonds
(B) Covalent bonds and dipole-dipole interaction
(C) Hydrogen bonds and dipole-dipole interaction
(D) Covalent bonds and ionic bonds

General Science MCQ – 153 (Chemistry)