Some Basic Concepts of Chemistry questions
951 published questions with worked solutions.
- One mole electron means:
- The weight of 11.2 litre of any gas at STP represents its:
- Total number of atoms present in 1.0 cm^3 of solid glucose (density 0.8 g/cm^3) at 25°C are:
- H_3PO_4 is a tribasic acid and one of its salts is NaH_2PO_4 . What volume of 1 M NaOH should be added to 12 g NaH_2PO_4 (mol....
- The haemoglobin from the red blood corpuscles of most mammals contains approximately 0.33% of iron by weight. The molecular...
- Equal weight of Fe_2O_3 and FeO has weight of oxygen in the ratio:
- The vapour density of a volatile chloride of a metal is 95 and the specific heat of the metal is 0.13 cal/g. The equivalent...
- Number of electrons in 1.8 mL of H_2O is :
- 5 mL of N HCl, 20 mL of N/2 H_2SO_4 and 30 mL of N/3 HNO_3 are mixed together and volume made one litre. The normality of the...
- What weight of silver chloride will be precipitated when a solution containing 4.77 g of NaCl is added to a solution of 5.77 g of...
- Silver (atomic weight = 108 g mol^ -1 ) has a density of 10.5 g cm^ -3 . The number of silver atoms on a surface of area 10^ -12...
- In CH_ 3 CH_ 2 Br , % of Br is [Br = 80]
- Find the total number of protons in 34 mg of NH_3 at STP. (Mass of 1p = 1.6726 10^ -27 kg).
- Find the total mass of neutrons (in kg) in 7 mg of ^ 14 C . (Assume that mass of a neutron = 1.675 10^ -27 kg.)
- A solution contains 25% H_2O, 25 % C_2H_5OH and 50 % CH_3COOH by mass. The mole fraction of H_2O would be
- How many grams of H_2SO_4 are present in 0.25 g mole of H_2SO_4 ?
- 3.0 molal NaOH solution has a density of 1.110 g/ml. The molarity of the solution is
- When 6 gm urea dissolve in 180 gm H_2O. The mole fraction of urea is [Mol. Wt. of urea=60]
- The number of moles of a solute in its solution is 20 and total numbers of moles are 80. The mole fraction of solute is
- The normality of 2.3 M H_2SO_4 solution is
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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