311. Which among the following is false about alpha particles?
1. They have high ionizing power
2. They have high penetrating power
3. They have high kinetic energy
4. They are positively charged helium nuclei
Option “B” is correct Alpha particles made of 2 protons and 2 neutrons and they have low penetrating power.
312. Which among the following is not a characteristic of oxidation reaction?
1. It involves addition of hydrogen
2. It involves addition of oxygen
3. It involves loss of electrons
4. It involves addition of electronegative element
Option “A” is correct Oxidation is loss of eletrons and addition of oxygen. It also involve addition of electronegative element.
313. Ozone is represented as _____.
1. O3
2. H2O2
3. Cl2O
4. N2O
Option “A” is correct Ozone is a gas composed of three atoms of oxygen (O3). Ozone occurs both in the Earth’s upper atmosphere and at ground level. Its presence as a layer in stratosphere serves as a screen (called ozone shield) to block harmful ultraviolet radiation from reaching the earth’s surface.
314. Which of the following is a chemical formula of quicklime?
1. Ca2O
2. Ca2CO3
3. CaO2
4. CaO
Option “D” is correct CaO is a chemical formula of quicklime.
