The correct answer is option (B) lemon juice.
pH refers to the logarithmic scale used to indicate the acidity or basicity of an aqueous solution. It is the negative of the base 10 logarithm of the activity of the hydrogen ion. Solutions with a pH less that 7 are considered acidic and the solutions with a pH greater that 7 are considered to be basic. A pH of 7 is neither an acid nor a base and is considered neutral.
An acid has a high concentration of hydrogen ions (H+) and a base has a low concentration of hydrogen ions. Higher the hydrogen ion concentration, pH is acidic. Among the given substances, lemon juice has a pH of 2, urine has a pH of 6, tomato juice has a pH of 4 and black coffee has a pH of 5. Since lemon juice has a pH of 2, it has the lowest –OH ion concentration.
Answer:
Earth is one of the eight planets of our planetary group that rotates around the sun.
Earth is the main known planet that upholds life in the whole planetary group.
World Earth Day is commended on the 22nd of April consistently. It is to increment public attention to the Earth's economical climate.
World Earth Day features the significance of ecological assurance for the endurance of life.
It is accepted that the Earth should be 4.5 billion years of age.
Right around 70% of the outer layer of the Earth is covered with water. Thus, it is known as a blue planet and an extraordinary planet.
Earth has an air holding back 20% of the oxygen that aides in the endurance of living creatures.
Gases like oxygen, carbon dioxide, and nitrogen in the Earth's environment assist plants with developing.
Earth is spheroid in shape. It is critical contrasted with different planets like Mercury, Mars, Neptune, Pluto, and Venus.
Earth finishes its circle around the sun in 365 days. In such a manner, it makes a jump year once in four years.
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I remember this from last year haha. The dark moths populations will go down since they can’t blend in as well as the light moths.
