251. Acetic acid is commonly known as _________.

1. Caustic soda
2. Spirit
3. Banking soda
4. Vinegar

Option “D” is correct
Acetic acid is known as vinegar.
252. __________ is a polar covalent bond.

1. P-Cl
2. Ne-Ne
3. Cl-Cl
4. Ca-Cl

Option “A” is correct
Polar covalent bonding is a type of chemical bond where a pair of electrons is unequally shared between two atoms. Bond between P-Cl is a polar covalent bond.
253. NaCl has ______.

1. Nonpolar bonds
2. Polar covalent bonds
3. Metallic bonds
4. Ionic bonds

Option “D” is correct
When sodium (Na) and chlorine (Cl) are combined, the sodium atoms each lose an electron, forming cations (Na+), and the chlorine atoms each gain an electron to form anions (Cl−). These ions are then attracted to each other in a 1:1 ratio to form sodium chloride (NaCl) and form ionic bond.
254. Hemoglobin has the highest affinity with which of the following?

1. SO2
2. CO2
3. CO
4. NO2

Option “C” is correct
Hemoglobin in humans has a very high affinity for carbon monoxide, forming carboxyhemoglobin which is a very bright red in color.
255. Vitamin A is also known as _____.

1. Thiamine
2. Riboflavin
3. Retinol
4. Calciferol

Option “C” is correct
Vitamin A is also known as retinol because it produces the pigments in the retina of the eye. Vitamin A promotes good vision, especially in low light.
256. Which drug is used as an Anti-Inflammatory?

1. Metformin
2. Diazepam
3. Latanoprost
4. Prednisone

Option “D” is correct
Prednisone drug is used as an Anti-Inflammatory drug. It is used to treat a number of different conditions, such as inflammation (swelling), severe allergies, adrenal problems, arthritis, asthma, blood or bone marrow problems, endocrine problems, eye or vision problems, stomach or bowel problems, lupus, skin conditions, kidney problems, ulcerative colitis, and flare-ups of multiple sclerosis.
257. Alkali metals can –

1. Be highly unstable at room temperature
2. Vaporize at room temperature
3. Easily gain electrons
4. Easily lose electrons

Option “D” is correct
Alkali metals have one electron in their outer shell so alkali metal can easily lose electrons.
258. What does a catalyst do in a reaction?

1. Changes potential energy of reactants
2. Changes kinetic energy of reactants
3. Changes potential energy of products
4. Changes activation energy

Option “D” is correct
Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalyst, which is not consumed in the catalyzed reaction and can continue to act repeatedly. Thus, changes activation energy.
259. Adding which substance gives green colour to glass?

1. Calcium oxide
2. Iron oxide
3. Chromium oxide
4. Manganese oxide

Option “C” is correct
Chromium oxide is used to create green glass.
260. The reactions in which oxidation and reduction occur simultaneously are called _______.

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

Option “B” is correct
A redox reaction is a type of chemical reaction that involves both oxidation and reduction simultaneously.
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