331. Which is the most abundant element after Oxygen?

1. Silicon
2. Carbon
3. Sodium
4. Chlorine

Option “A” is correct
The most abundant element on earth’s surface after Oxygen is Silicon.
332. Which among the following is present inside the nucleus of an atom?

1. Protons and Neutrons
2. Electrons and Protons
3. Neutrons and Electrons
4. Neutrons, Protons, Electrons

Option “A” is correct
There are two types of particle in the nucleus of an atom the proton and the neutron.
333. What is baking soda?

1. Aluminum bicarbonate
2. Sodium isolate
3. Sodium bicarbonate
4. Aluminum sulphate

Option “C” is correct
Baking soda is also known as Sodium bicarbonate. It is a chemical compound with the formula NaHCO3 It is a salt composed of sodium ions and bicarbonate ions. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder.
334. Who discovered Nitrogen?

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

Option “D” 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.
335. 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 “A” 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.
336. Which among the following metal is used for galvanization?

1. Zinc
2. Copper
3. Iron
4. Silver

Option “A” is correct
Galvanisation is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.
337. What is dry ice?

1. Solid Carbon dioxide
2. Solid Nitrogen dioxide
3. Solid Sulphur dioxide
4. Solid Water

Option “A” is correct
Dry ice, sometimes referred to as “cardice”, is the solid form of carbon dioxide. It is used primarily as a cooling agent. Its advantages include lower temperature than that of water ice and not leaving any residue. It is useful for preserving frozen foods where mechanical cooling is unavailable.
338. Chemically “Plaster of Paris” is:

1. Calcium Sulphate
2. Calcium Carbonate
3. Calcium Oxide
4. Calcium Oxalate

Option “A” is correct
A group of gypsum cement, essentially hemihydrated Calcium Sulphate (CaSO4. 1/2 H2O), a white powder that forms a paste when it is mixed with water and then hardens into a solid used in making a cast, mould and sculpture.
339. Which one of the following pairs is correctly matched?

1. Silver Iodide – Horn Silver
2. Silver Chloride – Artificial rain
3. Zinc Phosphide – Rat poison
4. Zinc Sulphide – Philosopher’s wool

Option “C” is correct
Pairs is correctly matched as such-
Silver Iodide – Artificial rain, Silver Chloride – Horn Silver, Zinc Phosphide – Rat poison, Zinc Oxide – Philosopher’s wool.
340. In atom, neutron was discovered by:

1. J.J. Thomson
2. Chadwick
3. Rutherford
4. Newton

Option “B” is correct
Neutron is a neutral particle which has no electrical charge. It was discovered by Chadwick in 1932.
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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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