Some Basic Concepts of Chemistry questions
951 published questions with worked solutions.
- 14 g of element X combines with 16 g of oxygen. On the basis of this information, which of the following is a correct statement?
- One mole of chlorine combines with a certain weight of a metal, giving 111 g of its chloride. The same amount of metal can...
- 10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. The amount of water produced in this reaction...
- 4.4 g of CO_2 and 2.24 litre of H_2 at STP are mixed in a container. The total number of molecules present in the container will...
- In a metal chloride, the weights of metal and chlorine are in the ratio of 1 : 2. The equivalent weight of the metal will be:
- Equivalent weight of oxygen is:
- A gas has the molecular formula O_n. If its vapour density is 24, the value of n is ___________
- 29.2% (w/W) HCl stock solution has density 1.25 g mL^ -1 . The molecular weight of HCl is 36.5 g mol^ -1 . The volume (mL) of...
- A compound H_2X, with molar weight of 80 g, is dissolved in a solvent having density 0.4 g mL^ -1 . Assuming no change in volume...
- What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO_3 is mixed with 50 mL of 5.8% NaCl solution? (Ag...
- If Avogadro number N_A is changed from 6.022 10^ 23 mol^ -1 to 6.022 10^ 20 mol^ -1 , this would change:
- When 22.4 litres of H_2(g) is mixed with 11.2 litres of Cl_2(g), each at S.T.P., the moles of HCl(g) formed is equal to:
- 1.0 g of magnesium is burnt with 0.56 g O_2 in a closed vessel. Which reactant is left in excess, and how much? (At. wt.: Mg =...
- Specific volume of a cylindrical virus particle is 6.02 10^ -2 cc/g, whose radius and length are 7 Å and 10 Å respectively. If...
- Volume of CO_2 obtained by the complete decomposition of 9.85 g of BaCO_3 is:
- In the reaction, 4 NH _3(g)+5 O _2(g) 4 NO (g)+6 H _2 O (g), when 1 mole of ammonia and 1 mole of O_2 are made to react to...
- The amount of zinc required to produce 224 mL of H_2 at STP on treatment with dilute H_2SO_4 will be:
- A 5 molar solution of H_2SO_4 is diluted from 1 litre to a volume of 10 litres, the normality of the resulting solution will be
- The number of gram molecules of oxygen in 6.02 10^ 24 CO molecules is
- Boron has two stable isotopes, ^ 10 B (19%) and ^ 11 B (81%). Calculate the average atomic weight of boron in the periodic table.
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