291. The common name of Sulphur is-

1. Freon
2. Galena
3. Lime
4. Brimstone

Option “D” is correct
Brimstone is an alternative name for sulfur.
292. Atomic Number of Hydrogen is _______.

1. 4
2. 3
3. 2
4. 1

Option “D” is correct
Atomic number of Hydrogen is 1.
293. Magnesium (Mg)+ Oxygen (O2)=?

1. Mg2O
2. MgO4
3. MgO2
4. MgO

Option “D” is correct}
The balance equation for the combustion of magnesium (combination/synthesis reaction) is:
2Mg + O2 = 2MgO.
294. Which amongst the following is not a Cation?

1. Aluminum ion
2. Copper ion
3. Sulphate ion
4. Zinc ion

Option “C” is correct
A Cation is a positively-charged ion, while an anion is negatively charged. Sulphate is an anion.
295. Which of the following is not a component of Smog?

1. Volatile organic compounds
2. Nitrogen Oxide
3. Sulphur dioxide
4. Chlorine oxide

Option “D” is correct
Smog is a type of air pollutant. It is composed of nitrogen oxides, sulphur oxides, ozone, smoke or particulates among others (less visible pollutants include carbon monoxide, CFCs and radioactive sources).
296. Highest percentage of carbon is found in which form of coal?

1. Anthracite
2. Bituminous
3. Peat
4. Lignite

Option “A” is correct
Anthracite is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content (>90%), the fewest impurities, and the highest energy density of all types of coal except for graphite.
297. Bee sting contains ___________

1. An acidic liquid
2. A salt solution
3. An alkaline liquid
4. A corrosive liquid

Option “A” is correct
Bee stings contains an acidic solution. Bee venom contains formic acid (also known as methanoic acid).
298. Radioactive disintegration of uranium ultimately results in formation of –

1. Radium
2. Thorium
3. Polonium
4. Lead

Option “D” is correct
Radioactive disintegration of uranium ultimately results in the formation of lead.
299. Which of the following metals has least melting point?

1. Gold
2. Silver
3. Mercury
4. Copper

Option “C” is correct
Melting point of different metals are- Copper 1083°C, Gold 1063 °C, Silver 951 °C and Mercury –38.83°C.
300. In an acid base reaction which product is produced along with a salt?

1. Hydrogen gas
2. Oxygen gas
3. Carbon dioxide
4. Water

Option “D” is correct
In an acid base reaction water is produced along with salt.
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64 thoughts on “Chemistry”

  6. Dolly

    I Love chemical…it’s my favourite subject..mere iss mein se hmesha hi boht ache marks aate hai….and my interest is also in chemistry…

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