Some Basic Concepts of Chemistry questions
951 published questions with worked solutions.
- One gram of hydrogen is found to combine with 80 g of bromine. One gram of calcium (valency = 2) combines with 4 g of bromine....
- 100 mL of 20.8% BaCl_2 solution and 50 mL of 9.8% H_2SO_4 solution will form BaSO_4. Solution (Ba = 137, Cl = 35.5, S = 32, H =...
- Statement 1: Strength of a solution is 10 , 000x g in one litre. Statement 2: 10x of solute is dissolved in 1 mL of solution.
- A metal nitride, M_3N_2 contains 28% of nitrogen. The atomic mass of metal, M is
- If isotopic distribution of C-12 and C-14 is 98% and 2% respectively then the number of C-14 atoms in 12 g of carbon is
- Statement 1: Weight of 1 molecule of O_2 is 32 u. Statement 2: 1 g molecule = 6.023 10^ 23 molecules.
- What quantity of ammonium sulphate is necessary for the production of NH_3 gas sufficient to neutralize a solution containing 292...
- There are two isotopes of an element with atomic mass z. Heavier one has atomic mass z+2 and lighter one has z-1, the abundance...
- An ore contains 1.34% of the mineral argentite, Ag_2S, by mass. How many grams of this ore would have to be processed in order to...
- Match the species in Column-I with the corresponding quantities in Column-II: | Column-I | Column-II | |---|---| | (A) 0.5 mol of...
- A 19.6 g of a given gaseous sample contains 2.8 g of molecules (d=0.75 g L^ -1 ), 11.2 g of molecules (d=3 g L^ -1 ), and 5.6 g...
- In the reaction, 2 Al + Cr _2 O _3 Al _2 O _3+2 Cr , 4.98 g of Al reacted with 20.0 g Cr_2O_3. How many grams of reactant remains...
- What volume of 90% alcohol by weight (d=0.8 g mL^ -1 ) must be used to prepare 80 mL of 10% alcohol by weight (d=0.9 g mL^ -1 )?
- Silver is removed from the solutions of its salts with metallic zinc, according to the reaction: Zn +2 Ag ^+ Zn ^ 2+ +2 Ag . A...
- HCl gas is passed into water, yielding a solution of density 1.095 g mL^ -1 and containing 30% HCl by weight. Calculate the...
- In Japan, during the earthquake on April 4, 2011, 0.060 kg of radioactive water leaked into the sea from nuclear reactors. How...
- Disilane (Si_2H_x) is analysed and found to contain 90.28% silicon by weight. What is the value of x? (Si = 28)
- When 2.495 g of CuSO_4 xH_2O is heated, 0.05 mole of H_2O is lost forming CuSO_4. What is the value of x?
- Na_2SO_3 zH_2O has 50% H_2O by mass. What is the value of z? (Na = 23)
- Mass of one atom of an element is 6.66 10^ -23 g. How many moles of element are there in 0.320 kg?
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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