321. Which of the following elements has the lowest melting point?

1. Iodine
2. Lead
3. Tin
4. Mercury

Option “D” is correct
Mercury has the lowest melting point. Mercury has a melting point of -37.89F.
322. The common name of sodium bicarbonate is _____.

1. baking soda
2. borax
3. bleach
4. epsom salt

Option “A” is correct
Sodium bicarbonate is commonly known as baking soda. It is a chemical compound with the formula NaHCO3.
323. Which drug is used as an Antidiabetic drug?

1. Metformin
2. Zolpidem
3. Promethazine
4. Hydralazine

Option “A” is correct
Metformin is an oral anti-diabetic drug for the treatment of diabetes.
324. Which fibre is also called as artificial silk?

1. Nylon
2. Rayon
3. Polyester
4. Acrylic

Option “B” is correct
Artificial silk is any synthetic fiber which resembles silk, but typically costs less to produce. Rayon fibre is also called as artificial silk.
325. The tip of the match-stick contains –

1. Phosphorus pentoxide
2. White phosphorus
3. Red phosphorus
4. Phosphorus trichloride

Option “C” is correct
The tip of the match-stick contains Red Phosphorus.
326. The energy, found in dry cell is-

1. Mechanic
2. Electric
3. Chemical
4. Electromagnetic

Option “C” is correct
The best example of changing into electric energy from chemical energy is primary cells or batteries, the dry cell is also made up in this phenomenon.
327. Which chemical substance is used for making rat poison?

1. Ethyl Alcohol
2. Methyl Isocyanate
3. Potassium Cyanide
4. Ethyl Isocyanide

Option “C” is correct
Potassium Cyanide (KCN) or Zinc Phosphide is a highly toxic chemical used as a rodenticide a poison to kill the mouse.
328. Which gas is used in fire extinguisher?

1. Carbon dioxide
2. Hydrogen
3. Oxygen
4. Sulphur dioxide

Option “A” is correct
Carbon dioxide gas is used in a fire extinguisher to control small fires, often in emergency situations.
329. Which of the following is not a part of an atom?

1. Electron
2. Proton
3. Neutron
4. Photon

Option “D” is correct
Proton, electron and neutron are part of an atom. These particles are also known as three fundamental particles, but the photon is associated with light energy and also known as energy packet of light.
330. What is the most commonly used substance in fluorescent tubes?

1. Sodium oxide and Argon
2. Sodium vapour and Neon
3. Mercury vapour and Argon
4. Mercury oxide and Neon

Option “C” is correct
A fluorescent lamp or fluorescent tube is a gas discharge lamp that uses electricity to excite mercury vapour. It contains Mercury Vapour and Argon.
Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

9 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…

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top