ATOMS AND MOLECULES - True/False

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Q 01 / 25
Atoms are indivisible and indestructible.
Q 02 / 25
A molecule of water contains two hydrogen atoms and one oxygen atom.
Q 03 / 25
Chemical symbols are always represented by one or two letters.
Q 04 / 25
Oxygen is a monatomic molecule.
Q 05 / 25
Law of conservation of mass states that mass can be created or destroyed.
Q 06 / 25
Law of constant proportions is also known as the law of definite proportions.
Q 07 / 25
Dalton’s atomic theory was the first to propose that atoms combine in simple ratios to form compounds.
Q 08 / 25
The atomic mass unit (amu) is defined based on hydrogen.
Q 09 / 25
Sodium's chemical symbol is So.
Q 10 / 25
HCl represents hydrochloric acid.
Q 11 / 25
The number of protons and electrons are equal in a neutral atom.
Q 12 / 25
\(\mathrm{O_2}\) represents a polyatomic molecule.
Q 13 / 25
One mole of any substance contains Avogadro’s number of particles.
Q 14 / 25
Gram molecular mass is the mass of one molecule in grams.
Q 15 / 25
Chemical formula of ammonia is \(\mathrm{NH_3}\).
Q 16 / 25
Atoms of the same element can have different masses.
Q 17 / 25
Hydrogen and oxygen combine to form water in a 2:1 mass ratio.
Q 18 / 25
The symbol for chlorine is Cl.
Q 19 / 25
All molecules are compounds.
Q 20 / 25
The valency of hydrogen is one.
Q 21 / 25
Atoms can exist freely in nature.
Q 22 / 25
Ions are electrically neutral.
Q 23 / 25
\(\mathrm{SO_4^{2-} is a polyatomic ion.
Q 24 / 25
Isotopes have the same atomic number but different mass numbers.
Q 25 / 25
Law of multiple proportions applies to any two elements combining to form more than one compound.
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