Some Basic Concepts of Chemistry questions
951 published questions with worked solutions.
- 10 mL of concentrated H_2SO_4 (18 M) is diluted to one litre. The approximate molarity of the dilute acid is:
- 1.0 g of hydrogen contains 6 10^ 23 atoms. The atomic weight of helium is 4. It follows that the number of atoms in 1 g of He is:
- Calculate the g-atom of an element in 40 kg, if the weight of one atom of the element is 6.644 10^ -23 g:
- Equivalent weight of a bivalent metal is 32.7. Molecular weight of its chloride is:
- Weight of a single molecule of water is:
- W_1 of an element combines with oxygen, forming W_2 g of its oxide. The equivalent weight of the element is:
- If V mL of the vapour of a substance at NTP weighs W g, the mol. wt. of the substance is:
- One mole of a mixture of CO and CO_2 requires exactly 20 g of NaOH in solution for complete conversion of all the CO_2 into...
- A,E,M and n are the atomic weight, equivalent weight, molecular weight and valence of an element. The correct relation is:
- Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of the element would...
- The weight of sulphuric acid needed for dissolving 3 g of magnesium carbonate is:
- For the reaction A+2B C, 5 moles of A and 8 moles of B will produce:
- A metal oxide has the formula Z_2O_3. It can be reduced by hydrogen to give free metal and water. 0.1596 g of the metal oxide...
- The weight of 50% (wt./wt.) solution of HCl required to react with 100 g of CaCO_3 would be:
- A g of a metal displaces V mL of H_2 at NTP. Equivalent weight E of the metal is:
- The weights of two elements which combine with one another are in the ratio of their:
- Density of air at NTP is 0.001293 g/mL. Its vapour density is:
- A person has as many notes as the number of oxygen atoms in 24.8 g Na_2S_2O_3 5H_2O (mol. wt. = 248.0). A note-counting machine...
- 1.35 g of pure Ca metal was quantitatively converted into 1.88 g of pure CaO. What is the atomic weight of Ca?
- Insulin contains 3.4% sulphur. The minimum mol. wt. of insulin would be:
Other chapters
Alcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAlternating CurrentAminesAnatomy of Flowering PlantsAncient Indian HistoryAnimal KingdomApplication of DerivativesArea Under CurveAromatic Compounds and Aryl HalidesAtomsBasic Mathematics and LogarithmBinomial TheoremBiodiversity and ConservationBiological ClassificationBiomoleculesBiotechnology and Its ApplicationsBiotechnology: Principles and ProcessesBody Fluids and CirculationBreathing and Exchange of GasesCell Cycle and Cell DivisionCell: The Unit of LifeChemical Bonding and Molecular StructureChemical Coordination and Integration