Some Basic Concepts of Chemistry questions
951 published questions with worked solutions.
- A gaseous hydrocarbon gives upon combustion 0.72 g. of water and 3.08 g. of CO₂. The empirical formula of the hydrocarbon is -
- Aqueous HCl reacts with MnO_2(s) to form MnCl_2(aq), Cl_2(g) and H_2O(l). What is the weight (in g) of Cl_2 liberated when 8.7 g...
- By usual analysis, 1.00 g of compound (X) gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound (X)...
- At T(K), 100 g of 98 % H_2SO_4 (w/w) aqueous solution is mixed with 100 g of 49 % H_2SO_4(w/w) aqueous solution. What is the mole...
- A + 2 B AB2. 36.0 g of 'A' (Molar mass : 60 g mol⁻¹) and 56.0 g of 'B' (Molar mass : 80 g mol⁻¹) are allowed to react. Which of...
- The mass of benzanilide obtained from the benzoylation reaction of 5.8 g of aniline, if yield of product is 82%, is ____ g...
- A student has planned to prepare acetanilide from aniline using acetic anhydride. The student has started from 9.3 g of aniline....
- For the given reaction; CaCO_3+2HCl CaCl_2+H_2O+CO_2 If 90 g CaCO_3 is added to 300 mL of HCl which contains 38.55% HCl by mass...
- Density of 3 M NaCl solution is 1.25 g/mL. The molality of the solution is :
- 20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is ______ 10^ -2 M....
- 0.01 mole of an organic compound (X) containing 10% hydrogen, on complete combustion produced 0.9 g H₂O. Molar mass of (X) is...
- When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is _____....
- 2.8 10^ -3 mol of CO2 is left after removing 10^ 21 molecules from its 'x' mg sample. The mass of CO2 taken initially is Given :...
- Consider the following reaction occurring in the blast furnace. Fe_3O_4(s) + 4CO(g) 3Fe(l) + 4CO_2(g) 'x' kg of iron is produced...
- The elemental composition of a compound is 54.2%, C, 9.2% H and 36.6% O. If the molar mass of the compound is 132 g mol^ -1 , the...
- Quantitative analysis of an organic compound (X) shows following % composition. C : 14.5%; Cl : 64.46%; H : 1.8% (Empirical...
- The molarity of a 70% (mass/mass) aqueous solution of a monobasic acid (X) is _______× 10^ -1 M(Nearest integer) [Given : Density...
- Concentrated nitric acid is labelled as 75% by mass. The volume in mL of the solution which contains 30 g of nitric acid is...
- Choose the correct statements. (A) Weight of a substance is the amount of matter present in it. (B) Mass is the force exerted by...
- In the Claisen-Schmidt reaction to prepare, dibenzalacetone from 5.3 g benzaldehyde, a total of 3.51 g of product was obtained....
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