Some Basic Concepts of Chemistry questions
951 published questions with worked solutions.
- The total number of electrons present in 1 mL Mg (given density of _ 12 Mg^ 24 =1.2 g/mL ):
- Number of electrons in 1.8 mL of H_2O are:
- Oxygen consists of O^ 16 ,O^ 17 and O^ 18 isotopes and carbon consists of isotopes of C^ 12 and C^ 13 . Total number of CO_2...
- Three isotopes of an element have mass numbers m,(m+1) and (m+2). If the mean mass number is (m+0.5), then which of the following...
- Atomic weight of Ne is 20.2. Ne is a mixture of Ne^ 20 and Ne^ 22 . Relative abundance of the heavier isotope is:
- The isotopic abundances of magnesium in nature are as follows: ^ 24 _ 12 Mg =79 %, ^ 25 _ 12 Mg =10 % and ^ 26 _ 12 Mg =11 %. The...
- Avogadro's hypothesis states that **[Kerala CEE 2003]**
- 10 mL of oxygen and 10 mL of hydrogen are kept at the same temperature and pressure. Which is correct about the number of...
- Equal volumes of H _2 and Cl _2 are mixed. How will the volume of the mixture change after the reaction?
- 1.0 L of N _2 and 7 8 L of O _2 at the same temperature and pressure were mixed together. What is the relation between the masses...
- One gram mole of a gas at NTP occupies 22.4 L of volume. This fact was derived from
- A preweighted vessel was filled with CO _2 at STP and weighed. It was then evacuated, filled with SO _2 at the same temperature...
- 32 g of O _2, 2 g of H _2 and 28 g of N _2 at STP occupy separately a volume of
- A gaseous mixture contains oxygen and nitrogen in the ratio 1:4 by weight. Therefore, the ratio of their number of molecules is:
- Which of the following pairs of gases contain the same number of molecules?
- Volume occupied by 3.01 10^ 23 molecules of acetylene at NTP is:
- 20 g of hydrogen is present in a 5 litre vessel. The molar concentration of hydrogen is:
- Gay-Lussac's law of combining volumes is applicable for those gases which, on mixing:
- 26 mL of CO _2 is passed over red hot coke. The maximum volume of CO formed is:
- The volume of ammonia obtained by the complete combination of 10 mL of N _2 and 30 mL of H _2 is:
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