Chemestry Test 1
Which one of the following is the softest?
Explanation: Sodium is indeed the softest metal among the options listed. Sodium is a soft, silvery-white, highly reactive metal that can be easily cut with a knife. It's softer than lithium, aluminum, and iron.
Salts of which of the following elements provide colours to fireworks?
Explanation: Strontium salts (like strontium carbonate) produce red colors in fireworks.
Barium salts (like barium nitrate) produce green colors in fireworks.
These elements are commonly used to create vibrant colors in pyrotechnics.
In which type of rocks are metals like Gold and Copper mostly found?
Explanation: Metals like gold and copper are primarily found in old igneous rocks, which form from the cooling and solidification of molten magma. These metals often accumulate in veins or deposits within these rocks over geological time periods.
The vinegar is a solution of
Explanation: Vinegar typically contains around 5% acetic acid by volume, with the remainder being water. It is used as a condiment, preservative, and in cooking for its tangy flavor.
In coloured galss. the purple colour is imparted by
Explanation: Manganese oxide is commonly used to impart a purple color to glass. It works as a decolorizer in glass production, and depending on the quantity used, it can produce shades of purple or violet.
The quantum theory was first enunciated by
Explanation: Max Planck is credited with formulating the quantum theory in 1900. He introduced the concept of "quanta" to explain blackbody radiation, which laid the foundation for quantum mechanics.
Which of the following is not a source of sulphur?