GREEN 1-100 Questions and Answers
| Latest Version | 2025/2026 | Correct &
Verified
Which type of bond is present in NaCl?
✔✔ a. Ionic bond
b. Covalent bond
c. Metallic bond
d. Hydrogen bond
Which element is classified as a halogen?
a. Oxygen
✔✔ b. Chlorine
c. Sodium
d. Magnesium
What is the oxidation state of sulfur in H₂SO₄?
a. +4
1
,✔✔ b. +6
c. +2
d. +3
Which gas is commonly released when an acid reacts with a carbonate?
a. Oxygen
b. Nitrogen
✔✔ c. Carbon dioxide
d. Hydrogen
Which element is an alkali metal?
a. Calcium
b. Magnesium
✔✔ c. Potassium
d. Aluminum
Which type of crystal structure does diamond have?
a. Ionic
2
,✔✔ b. Covalent
c. Metallic
d. Molecular
Which element is liquid at room temperature?
a. Bromine
✔✔ b. Mercury
c. Neon
d. Sodium
Which of the following is a transition element?
a. Sodium
✔✔ b. Iron
c. Oxygen
d. Calcium
Which oxide is amphoteric?
a. Na₂O
3
, b. CO₂
✔✔ c. Al₂O₃
d. SO₃
Which gas is most soluble in water at room temperature?
a. Oxygen
✔✔ b. Ammonia
c. Nitrogen
d. Hydrogen
Which element has the highest electronegativity?
a. Oxygen
b. Nitrogen
✔✔ c. Fluorine
d. Chlorine
Which halide is insoluble in water?
a. NaCl
4