Q350. Assertion (A): The main constituent of the liquefied petroleum gas is methane. Reason (R): Methane can be used directly for burning in homes and factories where it can be supplied through pipelines.

Assertion (A): Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluoro- carbons. Reason (R): Ammonia can be liquefied

Assertion (A): Sodium metal is stored under kerosene. Reason (R): Metallic sodium melts when exposed to air. (a) Both A and R are true and R is the correct expl

Assertion (A): Unsaturated fats are more reactive compared with the saturated fats. Reason (R): Unsaturated fats have only single bonds in their structure.

Assertion (A): Coal-based thermal power stations contribute to acid-rain. Reason (R): Oxides of carbon are emitted when coal burns.

Assertion(A): Synthetic detergents can lather well in hard water. Reason (R): Synthetic detergents form soluble calcium and magnesium salts with hard water.

Assertion (A): The temperature of a metal wire rises when an electric current is passed through it. Reason (R): Collision of metal atoms with each other release

Assertion (A): In our houses, the current in the A.C. electricity line changes direction 60 times per second. Reason (R): The frequency of alternating voltage s

Assertion (A): Formic acid is a stronger acid than acetic acid. Reason (R): Formic acid is an organic acid. (a) Both A and R are true and R is the correct expla

Assertion (A): In human body, liver has important role in fat digestion. Reason (R): Liver produces two important fat-digesting enzymes.

Assertion (A): The boiling point of water decreases as the altitude increases. Reason (R): The atmospheric pressure increases with altitude. Codes: (a) Both A a

Match List-I (Fuel gases) with List-II (Major constituents) and select the correct answer using the codes given below the lists: | List-I | List-II | | :--- |

Assertion (A): All the proteins in our food are digested in small intestine only. Reason (R): The protein-digesting enzyme from pancreas are released into small

Assertion (A) : India does not export natural rubber. Reason (R) : About 97% of India’s demand for natural rubber is met from domestic production.

Assertion (A): A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter, the copper piece appears hotter than the gla

Assertion (A): To orbit around the Sun the planet Mars takes lesser time than the time taken by the earth. Reason (R): The diameter of the planet Mars is less t

Assertion (A): To dilute sulphuric acid, acid is added to water and not water to acid. Reason (R): Specific heat of water is quite large.

Assertion (A): Amoeba reproduces by fission. Reason (R): All unicellular organisms reproduce by asexual methods.

Which one of the following is used as an explosive?

What is Bisphenol A (BPA)?

Mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines?

Which one of the following is another name of RDX?

Consider the following chemicals: 1. Benzene 2. Carbon tetrachloride 3. Sodium carbonate 4. Trichloroethylene Which of the above/is are used as dry cl

Consider the following statements: 1. Liquefied natural gas (LNG) is liquefied under extremely cold temperatures and high pressure to facilitate stora

Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons?

Assertion (A): Phenyl is used as a household germicide. Reason (R): Phenyl is phenol derivative and phenol is an effective germicide. (a) Both A and R