Question

C Fe
с. Cu
(N/NI) is the chemical symbol of Nickel
B. Choose the correct option.
1. Which out of the following cannot be broken down into simpler substances by
chemical means?
a. Element
b. Compound c. Mixture
d. Molecule
2. What is the chemical symbol of iron?
a. Ir
b.
d. F
3. Which of the following represents the chemical formula of a compound?
b. Ca
d. co,
4. What are the new substances (elements/compounds) formed in a chemical reaction
called?
a. Rust
b. Products
C. Mixtures
d. Reactants
S.
What is the substance responsible for the browning of cut surfaces of vegetables and
fruits called?
a. Zinc
b. Melanin
C. Rust
d. Copper
6. Which of the following elements exist as tetratomic molecules?
a. Hydrogen b. Nitrogen
C. Potassium
d. Phosphorous
7. What is the chemical formula for sodium oxide?
a. Nao
C. NaO,
d. Na 0,
8. Which gas is released in reaction of vinegar with baking soda?
a. Oxygen
b. Nitrogen c. Carbon dioxide d. Carbon monoxide
9. Which of the following elements exhibits valency 2?
a. Oxygen
b. Sodium
C. Aluminium
d. Nitrogen
10. Which of the following represents an element?
a. Naci
b. CI,
C. HCI
d. KCI
b. Na2O
Chemicals and Chemical Changes
63​

Answer 1

Answer:

what are these are they questions