Chemistry

431. Most liquids that conduct electricity are solutions of acids, bases and ______.

1. Copper
2. Aluminium
3. Salts
4. Iron

Option “3” is correct.
Most liquids that conduct electricity are solutions of acids, bases and salts.
432. Which base is present in milk of magnesia?

1. Magnesium hydroxide
2. Ammonium hydroxide
3. Sodium hydroxide
4. Calcium hydroxide

Option “1” is correct.
Milk of magnesia is the suspension of base Magnesium hydroxide  in water.
433. Which among the following has the maximum density?

1. Water
2. Ice
3. Ethylene
4. Acetone

Option “1” is correct.
Water has maximum density.
434. What happens in an oxidation reaction?

1. Protons are lost.
2. Electrons are lost
3. Neutrons are lost
4. Electrons are gained

Option “2” is correct.
Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.
435. The reactions in which oxidation and reduction occur simultaneously are called _______.

1. Feral reactions
2. Redox reactions
3. Demug reactions
4. Kerol reactions

Option “2” is correct.
A redox reaction is a type of chemical reaction that involves both oxidation and reduction simultaneously.
436. Who discovered Nitrogen?

1. Faraday
2. Heisenberg
3. Hooke
4. Rutherford

Option “4” is correct.
Nitrogen is a chemical element with symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.
437. Device used for the detection and measurement of all types of radiation (alpha, beta and gamma)-

1. Geiger counter
2. Polarimeter
3. Calorimeter
4. Radiometer

Option “1” is correct.
A Geiger counter (Geiger-Muller tube) is a device used for the detection and measurement of all types of radiation alpha, beta and gamma radiation.
438. Carnotite is an ore/mineral of _________.

1. Beryllium
2. Chromium
3. Uranium
4. Copper

Option “3” is correct.
Carnotite an important uranium ore.
439. There is a protocol signed to reduce production of CFC, known as –

1. CFC Protocol
2. IR Protocol
3. Montreal Protocol
4. UV Protocol

Option “3” is correct.
The Montreal Protocol is an international environmental agreement with universal ratification to protect the earth’s ozone layer by eliminating use of ozone depleting substances (ODS) like CFC, which would otherwise allow increased UV radiation to reach the earth.
440. Malachite is an ore/mineral of –

1. Lead
2. Manganese
3. Mercury
4. Copper

Option “4” is correct.
Malachite is an ore/mineral of copper.
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