The correct answer is Salt decreases the melting point of the ice cream.

The correct answer is Turbidity.

• Turbidity is the measure of the relative clarity of a liquid.
• It is an optical characteristic of water and is a measurement of the amount of light that is         scattered by material in the water when a light is shined through the water sample.
• The higher the intensity of scattered light, the higher the turbidity.
• The distance at which the disk disappears is the water clarity reading, which is recorded in       centimetres.

The correct answer is Heat is absorbed.

• When ice is converted into water then it absorbs all the heat energy without an increase in its temperature.

The correct answer is 5 NTU.

• According to the Bureau of Indian Standards (BIS)(IS -10500: 2012), the maximum permissible limit of turbidity in potable water should be 5NTU

• Turbidity levels should be maintained between 1 and 5 NTU to keep the
desirable drinking water quality as per the Bureau of Indian Standards.

• Turbidity in water means Turbidity is the measure of relative clarity of a liquid.
• Turbidity is produced by suspended particulate matter like plankton, inorganic and organic matter.

The correct answer is Mercury.

• The best conductor of heat among liquids is Mercury.

• Mercury
o Symbol- Hg
o The Greek name of mercury is hydrargyrum from where its symbol is
taken.
• Atomic number: 80
• Atomic mass: 200 u
• Melting point: -38 °C
• Boiling point: 356.7 °C
o It is the only metal element to exist in the liquid state at room temperature i.e. in the range 20 to 25 °C
• It is also called liquid silver.
o It is used in thermometers because it can record the slightest change in temperature.