Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO₃) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold.

Correct Option: C

Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO₃) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold.

Exhaust fumes of motor cars, gases produced from coal fire in a closed room and coal gas, all contain carbon monoxide, which is the cause of their poisonous nature. When carbon monoxide is inhaled, it prevents the oxygen from combining with hemoglobin and instead combines itself with hemoglobin to form carboxyhaemoglobin, which is stable compound. This causes oxygen starvation in the body tissues and eventually causes death by suffocation.

Correct Option: C

Exhaust fumes of motor cars, gases produced from coal fire in a closed room and coal gas, all contain carbon monoxide, which is the cause of their poisonous nature. When carbon monoxide is inhaled, it prevents the oxygen from combining with hemoglobin and instead combines itself with hemoglobin to form carboxyhaemoglobin, which is stable compound. This causes oxygen starvation in the body tissues and eventually causes death by suffocation.

Water gas is a synthesis gas, containing carbon monoxide (CO) and hydrogen gas (H₂). It is made by passing steam over a red-hot carbon fuel such as coke. The reaction between steam and hydrocarbons produce the gas mixture.

Correct Option: A

Water gas is a synthesis gas, containing carbon monoxide (CO) and hydrogen gas (H₂). It is made by passing steam over a red-hot carbon fuel such as coke. The reaction between steam and hydrocarbons produce the gas mixture.

Seaweed is rich in iodine, a trace element essential for healthy thyroid function and a healthy metabolism. Iodine is particularly vital for pregnant and lactating women. Seaweed also contains zinc and antioxidants, which help strengthen immunity.

Correct Option: A

Seaweed is rich in iodine, a trace element essential for healthy thyroid function and a healthy metabolism. Iodine is particularly vital for pregnant and lactating women. Seaweed also contains zinc and antioxidants, which help strengthen immunity.

A carbon footprint is historically defined as “the total sets of greenhouse gas emissions caused by an organization, event, product or person.” The most common way to reduce the carbon footprint of humans is to Reduce, Reuse, Recycle, Refuse. Recycling waste materials, using energy efficient appliances and using public transportation for commutation can all serve to reduce greenhouse gas emissions and, thus, reduce Carbon footprint.

Correct Option: A

A carbon footprint is historically defined as “the total sets of greenhouse gas emissions caused by an organization, event, product or person.” The most common way to reduce the carbon footprint of humans is to Reduce, Reuse, Recycle, Refuse. Recycling waste materials, using energy efficient appliances and using public transportation for commutation can all serve to reduce greenhouse gas emissions and, thus, reduce Carbon footprint.