Consider the following statements : 1. Other than those made by humans, nanoparticles do not exist in nature. 2. Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics. 3. Nanoparticles of some commercial products which enter the environment are unsafe for humans. Which of the statements given above is/are correct?

Consider the following statements: 1. Carbon fibres are used in the manufacture of components used in automobiles and aircrafts. 2. Carbon fibres once used cannot be recycled. Which of the statements…

Consider the following statements: 1. Packaged foods are purged with nitrogen gas in order to prevent their oxidation. 2. Tooth decay starts when pH of the mouth is lower than 5·5. 3. The reactivity…

With reference to green hydrogen, consider the following statements: 1. It can be used directly as a fuel for internal combustion. 2. It can be blended with natural gas and used as fuel for heat or p…

Consider the following statements about Tincture of Iodine : 1: It is an antiseptic solution. 2. Iodine is kept in alcohol-water mixture. 3. Concentration of iodine is very low. How many of the above…

Consider the following pairs: Commonly used/consumed materials Unwanted or controversial chemicals likely to be found in them 1. Lipstick – Lead 2. Soft drinks – Brominated vegetable oils 3. Chinese…