Option “D” is correct Acetic acid is the chief component of vinegar. Vinegar is liquid consisting mainly of acetic acid (CH3COOH) and water.
242. Which one of the following gases, released from biogas plant is used as a fuel gas?
1. Butane
2. Propane
3. Methane
4. Ethane
Option “C” is correct Methane is the principal gas in biogas. It is also the main component of natural gas, a fossil fuel, can be used to replace natural gas in many applications including cooking, heating, steam production, etc.
Option “B” is correct Sodium bicarbonate is also known as Baking Soda. The chemical formula of Sodium Bicarbonate is NaHCO3.
244. Which among the following is false about acids?
1. They give H+ ions in aqueous solution
2. Most acids contain hydrogen
3. They turn blue litmus red
4. They are bad conductor of electricity in aqueous solution
Option “D” is correct Acids are not bad conductor of electricity in aqueous solution.
245. The Chemical formula of Cadmium nitrate is _____.
1. Cd(NO3)2
2. CdNO3
3. Cd2(NO3)2
4. Cd2NO3
Option “A” is correct The Chemical formula of Cadmium Nitrate is Cd(NO3)2.
246. The Chemical formula of Cadmium nitrate is _____.Which glass is used to make sunglasses?
Option “A” is correct Crook Glass is a type of glass that contains cerium and other rare earths and has a high absorption of ultraviolet radiation; used in sunglasses.
247. Beryllium loses ____ electrons to achieve noble gas electron configuration.
1. 1
2. 2
3. 3
4. 4
Option “B” is correct Beryllium has atomic number 4. Beryllium loses 2 electrons to achieve noble gas electron configuration.
Option “A” is correct Milk of magnesia is the suspension of base Magnesium hydroxide Mg(OH)2 in water.
249. Which of the following is an ore of iron?
1. Dolomite
2. Epsom Salt
3. Siderite
4. Galena
Option “C” is correct Dolomite is an ore of Magnesium; Epsom salt is an ore of Magnesium and sulphur; Galena is an ore of lead and Siderite is an ore of iron.
250. CNG is-
1. Compressed Natural Gas
2. Cyanogen Natural Gas
3. Condensed Nitrogen Gas
4. Controlled Natural Gas
Option “A” is correct C.N.G. is the short form of compressed Natural Gas.
