Which of the following is an example of a chemical reaction...? Mcqs

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Which of the following is an example of a chemical reaction...?

(A) Water freezing into ice
(B) Sand settling to the bottom of a pool

(C) Leaves changing colors in the fall
(D) A rock rolling down a hill

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Which statement is incorrect about chemical reactions...?

(A) States of matter does not change during chemical reactions
(B) Chemical reactions produce new substances

(C) Chemical reactions occur with the absorption or emission of energy
(D) Chemical reactions may be fast, moderate or slow

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Oxidation is a chemical reaction involving the __________...?

(A) Gain of Electrons
(B) Loss of Electrons

(C) Gain of Protons
(D) Loss of Protons

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Which cell component is a jelly-like substance that contains many chemicals and facilitates chemical reactions...?

(A) Nucleus
(B) Cell Wall

(C) Cytoplasm
(D) Cell Membrane

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Which type of the following chemical reaction is CaO + CO2 → CaCO2:...?

(A) Combination Reaction
(B) Decomposition Reaction

(C) Neutralization Reaction
(D) None

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Enzymes catalyze chemical reaction by _____ the activation energy....?

(A) Raising
(B) Lowering

(C) Maintaining
(D) Ignoring

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Compressed Natural Gas (CNG) has the same chemical composition as that of _____...?

(A) LPG
(B) Tear gas

(C) Hydrogen
(D) Sui Gas

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The simplest kind of matter which cannot be further split up into simpler substances by chemical reactions is called...?

(A) Compound
(B) Atom

(C) Molecule
(D) Element

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The group of minerals chemically containing hydrocarbons is_______...?

(A) Silicate group
(B) Organic group

(C) Oxide group
(D) Hydride group

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Which is the best indication that a chemical reaction has taken place...?

(A) Blue powder turns water blue
(B) Metal budding when placed in an unknown liquid

(C) A white substance dissolving in water
(D) None

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Total mass of the reactants and products will remain conserved during a chemical reaction, this statement is called _____...?

(A) Law of definite proportions
(B) Law of conservation of mass

(C) Law of multiple proportions
(D) Law of reciprocal proportions

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According to Mosely the chemical properties of elements are the periodic function of their...?

(A) Atomic Size
(B) Atomic Mass

(C) Atomic Radius
(D) Atomic Number

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Which of the following is not a chemical reaction ...?

(A) Burning of coal
(B) Conversion of water into steam

(C) Digestion of food
(D) Burning of paper

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Which part of cell controls all the chemical reactions of the cell and it contains chromosomes...?

(A) Cell membrane
(B) Cytoplasm

(C) Vacuoles
(D) Nucleus

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