Chemistry: Exam One

1. Which of the following reaction is used for the preparation of bases?

A. Reaction of active metal oxides with water.
B. Reaction of metal hydroxides with dilute acids.
C. Heating of carbonates with dilute acids.
D. Heating of a salt with a non-volatile acid.

2. Which of the following salts is used in the treatment of waste water?

A. BaSO₄
B. CaCO₃
C. KNO₃
D. FeCl₃

3. A student prepared two beakers, each containing 100 mL of water. The student dissolved 10 mL of concentrated HCl in the first beaker and 10 mL of concentrated CH₃COOH in the second beaker, which of the following would occur in the solution?

A. In the first beaker, a small fraction of HCl dissociates into ions and in the second beaker, a large fraction of CH₃COOH dissociates into ions.
B. In the first beaker, a large fraction of HCl dissociates into ions and in the second beaker, a small fraction of CH₃COOH dissociates into ions.
C. The amount of HCl dissociated in the first beaker and the amount of CH₃COOH dissociated in the second beaker are identical.
D. There is no dissociation or ionization of the HCl and CH₃COOH in both the first and second beakers.

4. Consider the following five - steps during the extraction of aluminum from its bauxite ore by the Hall process:

I. Treating the mixture of an aqueous solution of sodium silicate and aluminate with an acid
II. Heating aluminum oxide strongly in a furnace
III. Heating the ore with sodium hydroxide solution
IV. Conversion of aluminum oxide to soluble sodium aluminate
V. Electrolysis of molten mixture of cryolite and aluminum oxide

Which of the following is the CORRECT sequence of production?

A. IV, II, I, III and V
B. III, IV, I, II and V
C. II, I, III, IV and V
D. V, I, II, IV and III

5. Which of the following food preservation methods leaves a product without loss of aroma or flavor?

A. Freeze - drying
B. Vacuum - packing
C. Melting
D. Freezing

6. Consider the following three steps:

Step 1: Electrolysis of water and fractional distillation of air
Step 2: Passing hot mixture of gases through a condenser
Step 3: Introducing hydrogen and nitrogen gases in a chamber containing iron particles at a temperature of 300 - 500 °C and a pressure of 15 - 25 MPa

Which of the following is the CORRECT sequence involved during the industrial production of ammonia using the Haber process?

A. Step 2 → Step 3 → Step 1
B. Step 1 → Step 3 → Step 2
C. Step 1 → Step 2 → Step 3
D. Step 2 → Step 1 → Step 3

7. Which of the following is a physical property of nitric acid, HNO₃?

A. Nitric acid is a corrosive chemical.
B. On exposure to light, it turns brown.
C. It forms large number of salts. D. Nitric acid has a pungent smell.

8. Which of the following is the CORRECT explanation about herbicides?

A. Organochlorine compounds are the most common herbicide substances.
B. Selective herbicides control specific weed species, leaving the desired crop unharmed.
C. Herbicides are substances that are used to enhance the growth of important plants.
D. Herbicides are substances that are used to control unwanted insects.

9. A student collected the following information from the community on the preparation of the local alcoholic drink "ARAKI":

Step 1: Distillation of the liquid mixture in traditional ways
Step 2: Adding a proportional amount of water to liquidity the tick dough - like mixture and leaving for 1-2 days for further fermentation¹
Step 3: "Bikel" preparation from barely, the starter ("Tinses") preparation by mixing the Bikel with Gesho (Rhamnuspronoides) powder and fermentation of the starter for few days²
Step 4: Baking of bread from different ingredients and breaking down the bread and mixing with the fermented starter and leaving for fermentation for couple of³ days

Which of the following is the correct procedure for the preparation of Araki?

A. Step 2 → Step 3 → Step 4 → Step 1
B. Step 2 → Step 4 → Step 3 → Step 1
C. Step 4 → Step 3 → Step 2 → Step 1
D. Step 3 → Step 4 → Step 2 → Step 1

10. Which one of the following synthetic polymers is used to make squeeze bottles, plastic wrapping and electrical insulation?

A. Polymethyl methacrylate
B. Polypropylene
C. Polyethylene
D. Polyvinylchloride

11. The electronic configuration of an element in the periodic table is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵. In which block does this element belong?

A. d-block
B. f-block
C. s-block
D. p-block

12. Consider the following chart of general periodic properties in the periodic table:

From the given periodic properties, which one CORRECTLY agrees with the periodic trend in the chart?

A. Electron affinity
B. Electronegativity
C. Atomic radius
D. Ionization energy

13. Which of the following is CORRECT about the formation of a covalent bond? A covalent bond is formed

A. between mobile and stationary electrons.
B. between positively and negatively charged ions.
C. by the transfer of valence electrons.
D. by the sharing of valence electrons.

14. The molecule of carbon tetrachloride (CCl₄) has four polar (C - Cl) bonds. However, (CCl₄) is a non-polar molecule. Which of the following explains the reason for the observed property of (CCl₄)?

A. The molecule is non-polar because of the difference in electronegativity between carbon and chlorine.
B. The molecule is non-polar because of the presence of four polar C- Cl bonds in the molecule.
C. Even though the bond in (CCl₄) is polar, the net dipole moment of the molecule is zero.
D. Even though the bond in (CCl₄) is polar, the net dipole moment of the molecule is different from zero.

15. Which of the following is responsible for the unusual high boiling points of HF, H₂O and NH₃?

A. Hydrogen bonding
B. London dispersion forces
C. Ionic bonding
D. Covalent bonding

16. What are the molecular formulae of an alkene and alkyne containing seven carbon atoms, respectively?

A. C₇H₁₆ and C₇H₁₄
B. C₇H₁₄ and C₇H₁₂
C. C₇H₁₂ and C₇H₁₄
D. C₇H₁₄ and C₇H₁₆

17. Which of the following is the CORRECT method of preparation of alkenes in the laboratory?

A. Heating of sodium salt of an organic acid with soda lime.
B. Alkylation of sodium acetylide with a primary alkyl halide.
C. Dehydration of alcohols with concentrated sulfuric acid.
D. Reaction of halogenated alkane with sodium.

18. Which of the following is the CORRECT structure of benzene?

A. A six-carbon ring with only single bonds (Cyclohexane)
B. A six-carbon ring with one double bond (Cyclohexene)
C. A six-carbon ring with three alternating double bonds (Benzene)
D. A six-carbon straight chain with three alternating double bonds (Hexatriene)

19. Which of the following is the product of fractional distillation of crude oil?

A. Naphthalene
B. Producer gas
C. Kerosene
D. Water gas

20. What is the molecular formula and IUPAC name of a saturated monocarboxylic acid having six carbon atoms?

A. C₅H₁₁COOH, heptanoic acid
B. C₆H₁₃COOH, heptanoic acid
C. C₅H₁₁COOH, hexanoic acid
D. C₆H₁₂COOH, hexanoic acid

Chemistry Exam One

Exam Results