Related InterviewSolutions

• The density of liquid mercury is 13.6 g `cm^(-3)` . How many moles of mercury are there in 1 litre of the metal ? (Atomic mass of Hg = 200.)
• The potential difference between the cathode. And the target electrod in a coolidge tube is 24.75 kV. The minimum wavelength of the emitted X-rays isA. `0.1 Å`B. `0.5 Å`C. `1 Å`D. `5 Å`
• What does each of the following represent ?1. 2CO22. 2H2S3. 5H2SO44. 6NaNO3
• Elements X and Y have 1 and 7 electrons in their outermost shell respectively.1. Which element will lose electron ? 2. Which element will gain electron ? 3. Which will form positive ion ? 4. Which will form negative ion ?5. What will be the charge present of the molecule XY after chemical combination ?
• Write the names of the elements present in the following compounds.1. Common salt 2. Ammonia3. Sulphuric acid4. Glucose5. Sodium hydroxide 6. Acetic acid
• An atom has 13 protons and 14 neutrons.1. What is the atomic number of the atom ?2. How many electrons would be present in this atom ?3. What is the atomic mass of the atom ?
• State Dalton’s atomic theory.
• Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
• What does the word ‘atom’ mean ?
• Who originated the word ‘atom’ ?