Some Basic Concepts of Chemistry questions
951 published questions with worked solutions.
- One atom of an element X weighs 6.643 10^ -23 g. Number of moles of atom in 20 kg is
- Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization. If the law of constant proportions is true, the...
- Out of 1.0 g dioxygen, 1.0 g (atomic oxygen) and 1.0 g ozone, the maximum number of molecules are contained in
- n gram of a substance X reacts with m gram of substance Y to form p gram of substance R and q gram of substance S. This reaction...
- Carbon dioxide contains 27.27% of carbon, carbon disulphide contains 15.79% of carbon and sulphur dioxide contains 50% of...
- Which of the following pairs contains equal number of atoms?
- Cortisone is a molecular substance containing 21 atoms of carbon per molecule. The molecular weight of cortisone is 360.4. What...
- Equal weights of Zn metal and iodine are mixed together and I_2 is completely converted to ZnI_2. What fraction by weight of...
- If 0.5 mole of BaCl_2 is mixed with 0.2 mole of Na_3PO_4, the maximum number of moles of Ba_3(PO_4)_2 that can be formed is
- One atom of an element weighs 1.8 10^ -22 g. Its atomic mass is
- About a gaseous reaction, xX + yY lL + mM. Which statement is wrong?
- Insulin contains 3.4% sulphur. What will be the minimum molecular weight of insulin?
- NO reacts with O_2 to form NO_2. When 10 g of NO_2 is formed during the reaction, the mass of O_2 consumed is
- A metal oxide is reduced by heating it in a stream of hydrogen. It is found that after complete reduction, 3.15 g of oxide...
- In the following reaction, MnO _2 + 4 HCl MnCl _2 + 2 H _2 O + Cl _2. 2 mol MnO_2 reacts with 4 mol of HCl to form 11.2 L Cl_2 at...
- An element X has the following isotopic composition: ^ 200 X: 90%, ^ 199 X: 8.0%, ^ 202 X: 2.0%. The weighted average atomic mass...
- For the reaction, X + 2Y Z, 5 moles of X and 9 moles of Y will produce
- What is the number of moles of Fe(OH)_3(s) that can be produced by allowing 1 mole of Fe_2S_3, 2 moles of H_2O and 3 moles of O_2...
- Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron...
- Statement 1: 10,000 molecules of CO_2 have the same volume at STP as 10,000 molecules of CO. Statement 2: Both CO and CO_2 are...
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