MCQ in General Chemistry Part 15 | ECE Board Exam

(Last Updated On: July 15, 2023)

This is the Multiples Choice Questions Part 15 of the Series in General Chemistry as one of the General Engineering and Applied Sciences (GEAS) topics. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize yourself with each and every question compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS) field.

Continue Practice Exam Test Questions Part 15 of the Series

⇐ MCQ in General Chemistry Part 14 | ECE Board Exam

Choose the letter of the best answer in each question.

701. What refers to the reaction of halogens that takes place at room temperature?

A. Hydrogeneration

B. Bromination

C. Hydration

D. Chlorination 

702. Calculate the final volume if a 1.50 L sample of gas at 905 torr and 10°C is changed to 1.000 ATM at 100°C

A. 1.25 L

B. 2.35 L 

C. 1.75 L

D. 2.85 L

703. All metals below has no reaction with steam except

A. iron 

B. lead

C. copper

D. silver

704. The noble gases occupy 1% of the atmosphere of which _______ is argon.

A. 0.83

B. 0.88 

C. 0.90

D. 0.93 

705. Of the elements below, which one has the highest electronegativity value?

A. Magnesium

B. Phosphorus

C. Carbon

D. Iodine 

706. Which of the following is a property of high carbon steel?

A. Malleable

B. brittle

C. ductile

D. all of the choices

707. In a certain experiment, argon effuses from a porous cup at 4.00 mmol/minute. How fast would chlorine effuse under the same condition?

A. 3.00 mmol/min (Your Answer)

B. 4.00 mmol/min

C. 3.50 mmol/min

D. 4.50 mmol/min

708. Pewter is metal used for making souvenirs. How many percent of pewter is antimony?

A. 1 

B. 3

C. 2 

D. 4

709. Who coined the term plasma in 1928?

A. William Crookes

B. Irving Langmuir

C. Albert Einstein

D. Eric Cornell

710. Calculate the initial volume if a sample of gas at 75°C is changed to 1.50 L at 25°C at constant pressure.

A. 1.75 L 

B. 1.95 L 

C. 1.85 L

D. 1.65 L

711. Nonpolar Covalent bond occurs if the difference in electronegativity ranges from

A. 0.00 to 0.40

B. 0.50 to 1.90 

C. 1.90 to 2.00

D. 2.00 and up

712. How will you test an ammonia gas?

A. Place a moist red litmus paper in the gas 

B. pass the gas through limewater

C. place a moist blue litmus paper in the gas

D. insert a glowing splint into the gas

713. The mole fraction of alcohol in water is 0.100 Calculate its molality.

A. 5.23 m

B. 6.17 m 

C. 4.32 m

D. 3.90 m

Unanswered

714. insoluble salts can be prepared by

A. filtration

B. distillation

C. precipitation 

D. evaporation

715. Calculate the mass of water required to prepare a 4.00 m aqueous solution of NH₃ using 25.0g HN₃.

A. 0.416 kg

B. 0.322 kg

C. 0.278 kg

D. 0.368 kg 

716. What alkali metal is usually used for x-ray apparatus because of its ability to allow x-rays to pass through with minimum absorption?

A. magnesium

B. radium

C. beryllium

D. barium

717. The oxidation number of a simple ion

A. is equivalent to its charge

B. is equal to zero

C. ranges from 0 to 1

D. ranges from -1 to 1

718. What is the range of carbon content for medium steel?

A. 0.6 – 1.0 %

B. 0.2 – 0.6 % 

C. 1.0 -1.5 %

D. < 0.2 %

719. The atmosphere contains how many percent carbon dioxide?

A. 0.01

B. 0.08

C. 0.03 

D. 0.05

720. The hardness of margarine formed is dependent on the amount of _________ added.

A. Hydrogen 

B. salt

C. milk

D. fat

721. Alkanes are saturated hydrocarbons that contain ________ carbon carbon covalent bonds

A. 2

B. 4

C. 1 

D. 3

722. _____________ is a reaction in which a molecule adds to the two carbon atoms of a double bond.

A. Addition Reaction 

B. Hydrogeneration reaction

C. chlorination reaction

D. bromination reaction

723. Calculate the empirical formula of a compound composed of 52.9 % carbon and 47.1 % oxygen

A. C0₂

B. C₄0₂

C. C₂0₂

D. C₃0₂ 

724. How much oxygen is required to convert 11.24 g of cadmium to 12.84 g of cadmium oxide?

A. 1.82 g

B. 1.60 g 

C. 1.34 g

D. 1.28 g

725. The highest average translational kinetic energy occurs in which state of matter?

A. Gas 

B. Solid

C. Liquid

D. Gas and liquid

726. If 2 L of solution contains 4.5 mol of solute, what is the molarity of the solution?

A. 2.50M

B. 2.75M

C. 2.25M 

D. 2.00M

727. Which of the following is most basic?

A. Ammonia

B. Milk of magnesia

C. bleach

D. baking soda

728. What is the color of bromine?

A. greenish-yellow

B. pale yellow

C. reddish brown 

D. purplish black

729. What gas is likely to behave as an ideal gas when subjected to high temperature and low pressure?

A. Krypton

B. Hydrogen

C. Oxygen

D. Helium

730. Which are pollutant traps heat to cause global warming or the “green house effect”?

A. Methane 

B. hydrocarbon

C. carbon monoxide

D. nitrogen oxide

731. The reaction of 6.54 g of zinc and 3.20 g of oxygen produces 9.74 g of zinc oxide, the only compound of theses elements. How much zinc oxide would be produced if 6.54 g of zinc and 5.00 g of oxygen were mixed and allowed to react?

A. 7.12 g

B. 9.74 g 

C. 6.89 g

D. 8.12 g

732. Who was the first to isolate oxygen in its gaseous state?

A. lavoiser

B. priestley

C. hess

D. dalton

733. “The solubility of gas in a liquid is directly proportional to the partial pressure of the gas above the solution”. This is known as:

A. Hund’s Law

B. Pascal’s Law

C. Henry’s Law 

D. Dalton’s Law

734. Brass contains how many percent copper?

A. 80%

B. 70% 

C. 75%

D. 65%

735. The chalcogens are elements in what group in the periodic table?

A. Group VA

B. Group VIA 

C. Group VIIA

D. Group IVA

736. If 6.537 g of zinc reacts with exactly 7.0906 g of chlorine to form the only compound of chlorine and zinc, how much zinc will react with 14.18g of chlorine?

A. 11.06 g

B. 14.90 g

C. 13.07 g 

D. 12.89 g

737. Which of the following metals reacts very slowly with dilute hydrochloric acid?

A. zinc

B. copper

C. silver

D. lead

738. Calculate the oxygen pressure in a mixture of 0.500 mol of oxygen and 0.750 mol of nitrogen with a total pressure of 40.0kPa

A. 15.0 kPa

B. 16.0 kPa 

C. 15.5 kPa

D. 16.5 kPa

739. What is the color of solid magnesium oxide?

A. black

B. brown

C. white 

D. gray

740. Which salts are insoluble in water?

A. carbonate salt 

B. sulphate salt

C. nitrate salt

D. ethanoate salts

741. Calculate the number of moles of gas in a sample occupying 245 mL at 409 torr at 38°C

A. 0.0516 mol

B. 0.516 mol

C. 0.00516 mol 

D. 5.16 mol

742. All halogens have how many electrons in the out shell of the atom?

A. 5

B. 6

C. 7 

D. 8

743. Which element in group 8 is used in the treatment of cancer?

A. radon 

B. argon

C. xenon

D. krypton

744. What mass of aluminium oxide must be electrolyzed with carbon electrodes to yield 1.59×10^6 g of aluminum and 2.48 x 10^6 g of carbon monoxide in the hall process for the industrial production? The carbon electrodes lost a total of 1.06 x 10^6 g of mass.

A. 4.01 x 10^6 g

B. 6.01 x 10^ 6 g

C. 5.01 x 10^ 6 g

D. 3.01 x 10^ 6 g 

745. On a space station, a 10.0-L steel drum of oxygen gas at 25°C and 101.3 kPa pressure springs a leak and 8.00 g of gas escapes before the leak is plugged. What is the final pressure of the oxygen in the drum at 25°C?

A. 37.1 kPa

B. 36.8 kPa

C. 39.4 kPa 

D. 38.2 kPa

746. Calculate the number of atoms in a 3.50 mol of atoms?

A. 2.11 x 10^24 

B. 4.11 x 10^24

C. 3.11 x 10^24

D. 5.11 x 10^24

747. Duralumin is an allow of aluminum, copper magnesium and manganese. How many percent of duralumin is manganese?

A. 2

B. 1 

C. 3

D. 4

748. Which of the following is most acidic?

A. boric acid

B. battery acid 

C. orange juice

D. vinegar

749. All metals below will not react with cold water except:

A. zinc

B. copper

C. calcium 

D. iron

750. A siren emits a sound which returns to the source in 4 s. how far away is the object which caused echo from the source? assume the temperature to be 30°C

A. 1,589 m

B. 1,472 m 

C. 1,267 m

D. 1,328 m

Complete List of MCQs in General Engineering and Applied Science per topic