Some Basic Concepts of Chemistry questions
951 published questions with worked solutions.
- The molecular weights of O_2 and SO_2 are 32 and 64 respectively. At 15°C and 150 mmHg pressure, one litre of O_2 contains 'N'...
- The number of oxygen atoms in 4.4 g of CO_2 is
- 1 cc N_2O at NTP contains
- The sulphate which is isomorphous with ZnSO_4.7H_2O, contains 10% metal in it. What is the atomic mass of the metal (up to one...
- In a metal oxide M_2O_3, the mass % of metal M is 53. What is the integer value of its atomic mass?
- How many of the following, contains in the mass of 1 g of CaCO_3? (1) 0.01 moles of CaCO_3 (2) 0.01 mole of Ca^ 2+ (3) 6.023 10^...
- A compound contains 16% sulphur by mass. What can be the least molecular mass?
- The number of water molecules in a litre of water is x N_A (N_A is Avogadro's number). Find the value of x up to two decimal...
- The empirical formula of a simple carbohydrate is CH_2O. 0.1 mole of its sample contains 1 g of hydrogen. Its molecular formula...
- One mole of a mixture of ethane and ethylene (ethene) completely combusts with 10 3 moles of oxygen. The mole fraction of...
- 14 g of hydrogen and 96 g of oxygen reacted and produced water. How many moles of water will be produced?
- 4 NH _3(g)+5 O _2(g) 4 NO (g)+6 H _2 O (g). In the above reaction, 1 mole of NH_3 and 1 mole of O_2 are made to react till...
- What will be the molality of 1.8 M H_2SO_4 solution (density = 1.8 g/cm^3)?
- When HCl gas is passed into water, it yields a solution containing 10% HCl by weight and of density 1.1 g/mL. What will be the...
- If the law of conservation of mass was to hold true, then 18.80 g of BaCl_2 on reaction with 11.80 g of H_2SO_4 will produce 7.30...
- Copper sulphate pentahydrate contains 25.45% copper and 36.08% water. If the law of constant proportion is true, then the weight...
- In the crystalline solid MSO _4 n H _2 O of molar mass 288 g mol^ -1 , the percentage of anhydrous salt is 56.25 by weight. The...
- The empirical formula and molecular mass of a compound are CH_2O and 150 g/mol respectively. The molecular formula of the...
- 2.4 g of a sample of magnesium when burnt in excess of O_2 gives 3.84 g of magnesium oxide. The percentage purity of magnesium in...
- The number of molecules present in 0.032 mg of O_2 is given as 6.022 10^X. Find 'X'.
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