You dont have javascript enabled! Please enable it! MCQ in General Chemistry Part 13 | ECE Board Exam

# MCQ in General Chemistry Part 13 | ECE Board Exam

This is the Multiples Choice Questions Part 13 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 13 of the Series

Choose the letter of the best answer in each question.

601. The temperature at which mercury starts to freeze is 35หC. What is the temperature in degrees Fahrenheit at which mercury cannot be used?

a. -63หF

b. -35หF

c. -31หF

d. -5.4หF

Explanation:

602. A piece of stone weighs 0.05 pounds. When it is submerged in a graduated cylinder containing 50 ml of H2O, the level rose to 60 ml. What is the density of the stone in g/ml?

a. 2.27

b. 2.72

c. 7.22

d. 7.27

Solution:

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603. A swimming pool 25 m wide, 100m long and 3m deep is filled with water up to a height of 2 m. How many kilograms of water have been placed inside the pool? (The density of water is 100 kg/m3.)

a. 5 million

b. 7.5 million

c. 10 million

d. 12.5 million

Solution:

To find the mass of water in the pool, we need to calculate the volume of water and then multiply it by the density of water.

The volume of water can be calculated by multiplying the area of the pool’s base (length x width) by the height of the water. In this case, the area of the base is 25 m x 100 m = 2500 mยฒ, and the height of the water is 2 m.

So, the volume of water in the pool is 2500 mยฒ x 2 m = 5000 mยณ.

Now, we can calculate the mass of water by multiplying the volume by the density of water. The density of water is given as 1000 kg/mยณ.

Mass of water = Volume of water x Density of water Mass of water = 5000 mยณ x 1000 kg/mยณ = 5,000,000 kg

Therefore, the correct answer is a. 5 million kilograms.

604. Which of the following is not an example a compound?

a. sugar

b. salt

c. ash

d. water

Explanation:

605. If two pure substances have different melting points, then

a. the two substances will surely have different densities

b. the two samples are certainly different pure substances

c. the two substances are certain to have identical chemical formulas

d. the two substances are certain to be compounds and not elements

Explanation:

606. Which of the following is a compound?

a. water

b. wine

c. soil

d. mercury

Explanation:

607. Which of the following processes is an example of a chemical change?

a. evaporation of seawater to form salt

b. melting of an ice cube

c. filtering of paper pulp from a liquid slurry using a sleve tray

d. rusting of iron

Explanation:

608. We know that air is a Homogeneous mixture and not a compound because

a. it has no definite shape

b. it has no definite volume

c. it can be compressed

d. its composition can vary

Explanation:

609. What do you call a substance that is composed of two or more elements bounded chemically?

a. an isotope

b. an element

c. a compound

d. a mixture

Explanation:

610. Which of the following examples is a physical change?

a. crystallization of sugar from sugar can juice

b. fermenting of ethanol to form wine

c. burning of a piece of candle

d. clotting of blood

Explanation:

611. Which of the following cannot be further decomposed by ordinary chemical means?

a. water

b. sugar

c. air

d. silver

Explanation:

612. Which of the following is not a manifestation of a chemical change?

a. reaction of a compound and an element to form a new compound and an element

b. breaking down of compound into elements

c. combining of atoms of elements to form a molecule

d. separation of the molecules in a mixture

Explanation:

613. What do you call a nuclear reaction resulting from the interaction of two nuclei to form a bigger nucleus and an accompanying release of energy?

a. nuclear fission

b. alpha emission

c. nuclear fusion

Explanation:

614. Which of the following materials cannot be subjected to carbon dating to determine age?

a. a trunk of wood

b. a sword

c. a smear of blood on a piece of cloth

d. an ancient Egyptian scroll

Explanation:

615. What law states that the pressure of a gas is directly proportional to its absolute temperature at constant volume?

a. Charlesโ law

b. Gay-Lussacโs Law

c. Boyleโs Law

d. Daltonโs Law

Explanation:

616. To what conditions does a gas behave like an ideal gas?

a. low temperature and low pressure

b. low temperature and high pressure

c. high temperature and low pressure

d. high temperature and high pressure

Explanation:

617. What Law states that the pressure of gas is inversely proportional to its volume at constant temperature?

a. Charlesโ law

b. Gay-Lussacโs Law

c. Boyleโs Law

d. Daltonโs Law

Explanation:

618. Which gas diffuses faster?

a. CH4

b. O2

c. CO

d. He

Explanation:

619. Which of the following best describes heat?

a. The capacity to do work

b. Forces times distances

c. Sum of thermal and chemical energy

d. An energy transfer due to temperature difference

Explanation:

620. What happens to water when it begins to vaporize?

a. it increases in temperature

b. it decreases in temperature

c. no change in temperature

d. no change in thermal energy

Explanation:

621. Burning of Gasoline initially requires heat before it burns spontaneously. Which of the following does not give a good explanation of this phenomenon?

a. the initial heat rises the enthalpy of the reactant

b. the initial heat lowers the activation of energy of the reactants

c. the enthalpy of reactants is lower than the enthalpy of products.

d. The enthalpy of the product is lower than the enthalpy of the reactant

Explanation:

622. Which of the following is an endothermic process?

a. melting of ice

b. burning of paper

c. neutralization of a strong acid and a strong base

d. violent reaction of sodium metal with water

Explanation:

623. Which of the following events is heat exchange involved?

a. when there is a phase change

b. when there is a chemical reaction

c. when the gas expands adiabatically

d. when there is difference in temperature

Explanation:

624. Who first predicted the wave-particle dual property of electrons?

a. Hund

b. Heisenberg

c. De Broglie

d. Schrodinger

Explanation:

625. Who postulated the wave equation that describes the properties of electrons in an atom?

a. Bohr

b. Heisenberg

c. Pauli

d. Schrodinger

Explanation:

626. Atoms of nonmetals generally reacts with a toms of metals by

a. gaining electrons to form ionic compounds

b. gaining electrons to form covalent compounds

c. sharing electrons to form ionic compounds

d. sharing electrons to form covalent compounds.

Explanation:

627. The addition of a nonvolatile solute to a solvent will cause

a. the vapor pressure of the solvent to increase

b. the vapor pressure of the solvent to decrease

c. the vapor pressure of the solvent to remain unchanged

d. none of these

Explanation:

628. Which of the following factors does not affect the rate of reaction?

a. the number of products formed

b. the nature of reactants

c. temperature

d. concentration of reactants

Explanation:

629. Which of the following statements about the catalyst is not true?

a. they may slow down the reaction

b. they may speed up the reaction

c. they are present in living substances

d. they may become new substances after the reaction

Explanation:

630. Which of the following statements about equilibrium is TRUE?

a. it exists in a closed system at varying temperature

b. it exists in an open system

c. it exists between a liquid and its vapor in a closed system at uniform temperature

d. it may exist between a solid and a liquid.

Explanation:

631. According to the Bronsted-Lowry theory, an acid is

a. a proton donor

b. a proton acceptor

c. a proton donor and a proton acceptor

d. neither a proton donor nor a proton acceptor

Explanation:

632. Which is not true of bases?

a. they always contain OH ions

b. they neutralize acid

c. the PH of their solution is greater than 7

d. they react with H3O ions

Explanation:

633. Organic Chemistry is the chemistry of compounds containing the element

a. hydrogen

b. carbon

c. oxygen

d. nitrogen

Explanation:

634. What is the mass in grams of 1 liter of carbon monoxide (CO), at standard temperature and pressure (STP)? Note: the molecular weight (MW) of CO is 28 g/mole, and at STP, ! mole of any gas occupies a volume of 22.4 liters.

a. 1.20

b. 1.35

c. 1.45

d. 1.25

Solution:

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635. Two thirds of the atom in a molecule of water is Hydrogen. What Percentage weight of a water molecule if the weight of two hydrogen atoms? The atomic weight of hydrogen is 1.008 g/mol and oxygen is 16.00 g/mole.

a. 19.12

b. 11.19

c. 19.11

d. 12.19

Explanation:

636. How many protons (P) and neutrons are there in the nucleus are present in a Pb nucleus of atomic mass of 206?

a. P = 92, N = 156

b. P = 85, N = 160

c. P = 82. N = 124

d. P = 90. N = 150

Solution:

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637. A 0.064 kg of octane vapor (MW = 114) is mixed with0.91 kg of air (MW = 29.0) in the manifold of an Engine. The total pressure in the manifold is 86.1 kPa, and a temperature is 290 K. assume octane behaves ideally. What is the partial pressure of the air in the mixture in KPa?

a. 46.8

b. 48.6

c. 84.6

d. 64.8

Solution:

To find the partial pressure of air in the mixture, we can use Dalton’s Law of Partial Pressures. According to this law,

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638. Hydrogen Peroxide solution for hair bleaching is usually prepared mixing 5 grams of hydrogen peroxide (H202). Molecular weight = 34g/ mole) per 100 ml solution. What is the molarity of this solution?

a. 1.0 M

b. 1.5 M

c. 1.95 M

d. 1.8 M

Solution:

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639. A cylinder contains oxygen at a pressure of 10 atm and a temperature of 300 K. The volume of the cylinder is 10 liters. What is the mass of the oxygen in grams? Molecular weight (MW) of oxygen is 32 g/mole?

a. 125.02

b. 130.08

c. 135.05

d. 120.04

Explanation:

640. The molecular diameter of CO is 3.10 x 10-8 at 300K and pressure of 100 mmHg. What is the mean free path of the gas in cm?

a. 6.86 x 10-3

b. 6.86 x 10-5

c. 2.86 x 10-4

d. 6.86 x 10-9

Explanation:

641. How many moles are there in one atom?

a. 3.6 x 10-23

b. 1.66 x 10-24

c. 2.86 x 10-4

d. 6.86 x 10-9

Explanation:

642. What is equivalent weight of Sulfuric Acid?

a. 49

b. 98

c. 23

d. 100

Explanation:

643. What type of bond results in form the sharing of electrons by two atoms?

a. atomic bond

b. covalent bond

c. metallic bond

d. ionic bond

Explanation:

644. What do you call a substance that disassociates in solutions to produce positive and negative ions?

a. base

b. acid

c. electrolyte

d. solute

Explanation:

645. During the complete or partial neutralization of acids. What is the ionic compound formed?

a. salt

b. sugar

c. potassium

d. sulfur

Explanation:

646. Which of the following are found in the nucleus of an atom?

a. electrons and protons

b. electrons and neutrons

c. protons and neutrons

d. electrons, protons and neutrons

Explanation:

647. Which of the following elements and compounds is unstable in its pure form?

a. Helium

b. Neon

c. Carbon Dioxide

d. Sodium

Explanation:

648. What refers to the negatively charge component of an atom?

a. electron

b. proton

c. neutron

d. ion

Explanation:

649. What element is known as the lightest metal?

a. Aluminum

b. Manganese

c. Magnesium

d. Lithium

Explanation:

650. Halogens fall under what group in the periodic table?

a. group VIA

b. group VA

c. group IVA

d. group VIIA

Explanation:

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

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