The incorrect statement is: (d) An isotope of magnesium is used in the formation of chlorophyll. Magnesium itself (not its isotope) is essential in the formation of chlorophyll, but the isotope of magnesium is not specifically used in this process.
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The correct answer is: (b) 35.5 u The atomic mass of chlorine is approximately 35.5 u, which is the weighted average of the isotopes chlorine-35 and chlorine-37. This average accounts for their relative abundance in nature. Class 9th Science NCERT ...
(d) valency of each element. The chemical formula of a molecular compound is determined by the valency of each element. The valency indicates how many bonds an element can form, which helps in combining elements in the correct ratio to ...
To find the number of neutrons in sodium (Na) and magnesium (Mg), we subtract the atomic number from the atomic mass: Sodium (Na) has an atomic number of 11 and an atomic mass of 23. Neutrons = 23 – 11 ...
The molecular mass of glucose (C6H12O6) is calculated by adding the atomic masses of its constituent atoms: 6 carbon (12 u), 12 hydrogen (1 u), and 6 oxygen (16 u). This gives a total of 180 u. So, the correct ...
The correct answer is: (c) Atoms of same or different elements can join together to form molecules. Molecules are formed when atoms of either the same element (e.g., O₂) or different elements (e.g., H₂O) bond together. The combination of atoms ...
The correct answer is: (b) in mass and chemical properties. Atoms of a given element are identical in terms of their mass and chemical properties. They have the same number of protons, which defines the element, and their behavior in ...
Magnesium (Mg) and sulfur (S) combine to form magnesium sulfide (MgS) according to the reaction: Mg + s → From atomic masses: Magnesium (Mg) = 24 g/mol Sulfur (S) = 32 g/mol The ratio of magnesium to sulfur in MgS is:
The correct answer is (b) John Dalton. John Dalton proposed the first atomic theory in the early 19th century, which stated that matter is made up of indivisible particles called atoms, and that atoms of the same element are identical ...
The correct answer is (c) atomic mass units. The relative mass of a molecule is expressed in atomic mass units (amu) or daltons (Da). This unit compares the mass of a molecule to the mass of an atom of carbon-12, ...