Practice MCQ Questions and answers on Chemistry-GK

The oil used in froth flotation process in pine oil, it is because it does not have affinity towards water and it easily attracts impurities and impurities can easily wash away.

The number of waves in n x 10^th Bohr's orbit are n waves.

The mass of one Avogadro number of helium atom is 4 x 6.02 x 10²³ gram.

The items amenable to detection by soft x-rays are genuine coins from counterfeit coins.

The material which can be deformed permanently by heat and pressure is called thermoset.

The mass number (A), is the total number of protons and neutrons ns) in an atomic nucleus so sometimes more than and sometimes equal to its atomic number, depends upon no of neutrons.

The inexpensive and commonly used variety of glass is called soda glass. It is called so because is made using soda(sodium carbonate).

Hydrogenation - to treat with hydrogen - is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst. The process is commonly employed to reduce or saturate organic compounds. The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds). Their partial hydrogenation reduces most but not all, of these carbon-carbon double bonds. Hydrogenation converts liquid vegetable oils into solid or semi-solid fats, such as those present in margarine.

The ionic radii of N^3-, O^2-, F_- and Na⁺ follows the order N^3- > O^2- > F^- > Na⁺

In nuclear reactor graphite rods are used as moderator or controller. Application of moderator is to slow down the neutron and controller is to control the number of neutron.