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.
315. What is the name of the acid in grapes?

1. Lactic acid
2. Formic acid
3. Acetic acid
4. Tartaric acid

Option “D” is correct
The principal organic acid found in grapes is Tartaric Acids.
316. Which acid is present in lemon?

1. Formic acid
2. Citric acid
3. Lactic acid
4. Tartaric acid

Option “B” is correct
Citric Acid is mainly present in Lemon.
317. Tear gas used by the police to disperse the mob contains –

1. Carbon dioxide
2. Chlorine
3. Ammonia
4. Hydrogen sulphide

Option “B” is correct
Tear gas used by the police to disperse the mob contains Chlorine.
318. Formation of ozone hole is maximum over –

1. Africa
2. India
3. Antarctica
4. Europe

Option “C” is correct
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone.
319. Soda water was invented by –

1. Tivadar Puskas
2. Joseph Priestley
3. Petrache Poenaru
4. James Leonard Plimpton

Option “B” is correct
Soda water was invented by Joseph Priestley.
320. The mass of proton and mass of ________ is same.

1. Neutron
2. Electron
3. Isoprone
4. Alpha particle

Option “A” is correct
Protons and neutrons have nearly the same mass while electrons are much less massive.
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11 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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