Tamil Nadu SSLC (Class 10) Atoms and Molecules — practice questions
21 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice Tamil Nadu SSLC (Class 10) Atoms and Molecules in the app →An element has two isotopes: one of mass 9 amu (50% abundance) and another of mass 10 amu (50% abundance). WhaHow many entities are present in exactly one mole of any substance (the value of Avogadro's number)?What volume does one mole of any gas occupy at standard temperature and pressure (STP)?A molecule made up of two atoms of two different elements is best described as which type of molecule?The mass number of an atom is defined as the sum of which two subatomic particles?One atomic mass unit (1 amu) is defined as which of the following?Calculate the number of moles in 46 g of sodium. (Atomic mass of Na = 23)How many moles of oxygen gas are present in 5.6 litre of oxygen measured at STP?A sample contains $12.046 \times 10^{23}$ atoms of iron. How many moles of iron does it contain?What is the gram molecular mass of carbon dioxide, CO2? (Atomic masses: C = 12, O = 16)Find the mass of 0.3 mole of aluminium. (Atomic mass of Al = 27)Calculate the mass percentage of carbon in methane, CH4. (Atomic masses: C = 12, H = 1)What is the relationship between the relative molecular mass of a gas and its vapour density?Among the following, which sample has the smallest mass?Boron occurs as B-10 (20% abundance) and B-11 (80% abundance). Calculate its average atomic mass.Calculate the number of molecules present in 11.2 litre of CO2 measured at STP. (NA = 6.023 x 10^23)How many molecules of water are present in 54 g of H2O? (Molecular mass of H2O = 18, NA = 6.023 x 10^23)What volume at STP is occupied by 2.5 mole of CO2 gas? (Molar volume = 22.4 litre)Calculate the gram molecular mass of calcium phosphate, Ca3(PO4)2. (Atomic masses: Ca = 40, P = 30, O = 16)How many atoms of oxygen are present in 5 moles of CO2? (NA = 6.023 x 10^23)Calculate the mass percentage of sulphur in sulphuric acid, H2SO4. (Atomic masses: H = 1, S = 32, O = 16)