MCQ in General Chemistry Part 18 | ECE Board Exam

This is the Multiple Choice Questions Part 18 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 18 of the Series

⇐ MCQ in General Chemistry Part 17 | ECE Board Exam

Choose the letter of the best answer in each question.

851. What is the charge of an electron?

A. Positive

B. Negative

C. Neutral

D. Variable

852. What is the SI unit of mass?

A. Kilogram

B. Gram

C. Pound

D. Mole

853. Which of the following is an example of a noble gas?

A. Oxygen

B. Nitrogen

C. Argon

D. Hydrogen

854. What is the main component of natural gas?

A. Ethane

B. Propane

C. Methane

D. Butane

855. Which element is essential for respiration?

A. Oxygen

B. Carbon dioxide

C. Nitrogen

D. Argon

856. The atomic number represents the number of:

A. Electrons only

B. Neutrons only

C. Protons only

D. Protons and neutrons

857. The most abundant gas in the Earth’s atmosphere is:

A. Oxygen

B. Nitrogen

C. Carbon dioxide

D. Helium

858. Which of the following is a physical change?

A. Rusting of iron

B. Burning of wood

C. Melting of ice

D. Digestion of food

859. The pH of pure water is:

A. 0

B. 7

C. 14

D. 10

860. What type of reaction is 2H₂ + O₂ → 2H₂O?

A. Decomposition

B. Synthesis

C. Single displacement

D. Double displacement

861. Which of the following is an alkali metal?

A. Calcium

B. Potassium

C. Iron

D. Copper

862. What type of bond is formed between two nonmetals?

A. Ionic

B. Covalent

C. Metallic

D. Hydrogen

863. The periodic table is arranged by increasing:

A. Atomic number

B. Atomic mass

C. Density

D. Reactivity

864. What is the lightest element?

A. Helium

B. Hydrogen

C. Lithium

D. Oxygen

865. Which of the following elements is essential for the formation of hemoglobin in the blood?

A. Calcium

B. Iron

C. Magnesium

D. Zinc

866. Which gas is responsible for the greenhouse effect?

A. Oxygen

B. Nitrogen

C. Carbon dioxide

D. Neon

867. What is the mass number of an atom with 6 protons and 6 neutrons?

A. 6

B. 12

C. 18

D. 24

868. What is the common name for sodium chloride?

A. Baking soda

B. Salt

C. Sugar

D. Vinegar

869. What is the chemical symbol for gold?

A. Au

B. Ag

C. Pb

D. Fe

870. What is the process of removing salt from seawater?

A. Filtration

B. Distillation

C. Reverse osmosis

D. Evaporation

871. Which type of radiation has the highest energy?

A. Alpha

B. Beta

C. Gamma

D. X-ray

872. Which gas is commonly known as “laughing gas”?

A. Carbon dioxide

B. Nitrogen dioxide

C. Nitrous oxide

D. Ammonia

873. What is the state of matter with no fixed shape or volume?

A. Solid

B. Liquid

C. Gas

D. Plasma

874. What do catalysts do in a chemical reaction?

A. Slow it down

B. Speed it up

C. Stop the reaction

D. Change the reactants

875. Which law states that matter cannot be created or destroyed?

A. Boyle’s Law

B. Law of Conservation of Mass

C. Charles’s Law

D. Avogadro’s Law

876. What is the pH of lemon juice?

A. Less than 7

B. Exactly 7

C. More than 7

D. Cannot be determined

877. What is the chemical symbol for lead?

A. Pb

B. Fe

C. Au

D. Sn

878. What is the lightest noble gas?

A. Neon

B. Helium

C. Argon

D. Xenon

879. What is the boiling point of water at sea level?

A. 50°C

B. 75°C

C. 100°C

D. 150°C

880. What is the most electronegative element?

A. Oxygen

B. Fluorine

C. Chlorine

D. Nitrogen

881. What is the main component of air?

A. Oxygen

B. Nitrogen

C. Carbon dioxide

D. Hydrogen

882. What type of reaction is combustion?

A. Synthesis

B. Decomposition

C. Exothermic

D. Endothermic

883. Which element is commonly used in batteries and is the lightest metal?

A. Sodium

B. Magnesium

C. Lithium

D. Calcium

884. Which part of the atom is responsible for chemical bonding?

A. Proton

B. Neutron

C. Electron

D. Nucleus

885. What is the oxidation state of oxygen in most compounds?

A. +1

B. -1

C. 0

D. -2

886. Which gas is known as laughing gas?

A. Oxygen

B. Nitrous oxide

C. Hydrogen

D. Carbon dioxide

887. What is the most reactive metal?

A. Iron

B. Sodium

C. Potassium

D. Francium

888. What is the main gas in Earth’s ozone layer?

A. O₂

B. O₃

C. CO₂

D. N₂

889. Which type of bond is the strongest?

A. Ionic

B. Covalent

C. Metallic

D. Hydrogen

890. Which acid is found in vinegar?

A. Sulfuric acid

B. Hydrochloric acid

C. Acetic acid

D. Citric acid

891. What is the name of the group 1 elements?

A. Alkali metals

B. Transition metals

C. Halogens

D. Noble gases

892. What is the formula for calcium carbonate?

A. CaCO₃

B. CaCl₂

C. CaO

D. CaSO₄

893. What is the common name for H₂O₂?

A. Water

B. Hydrogen peroxide

C. Ammonia

D. Methane

894. What is the state of bromine at room temperature?

A. Solid

B. Liquid

C. Gas

D. Plasma

895. What do you call a substance that cannot be broken down further by chemical means?

A. Compound

B. Mixture

C. Element

D. Solution

896. Which gas is used in balloons because it is lighter than air?

A. Oxygen

B. Hydrogen

C. Helium

D. Nitrogen

897. What is the charge of a neutron?

A. Positive

B. Negative

C. Neutral

D. Variable

898. What type of substance speeds up a reaction without being consumed?

A. Enzyme

B. Catalyst

C. Reactant

D. Product

899. What is the unit of measure for atomic mass?

A. Gram

B. Mole

C. Atomic mass unit (amu)

D. Kilogram

900. What is another name for quicklime?

A. Sodium hydroxide

B. Calcium oxide

C. Magnesium chloride

D. Ammonium nitrate

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