NEET CHEMISTRY QUIZ 6 JULY 25

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Basic Concepts of Chemistry - Theory MCQs

Q1. Matter possesses
Only volume
Only energy
Only charge
Mass

Q2. 22-carat gold is a
Element
Mixture
Compound
Alloy-free metal

Q3. Dry ice is a
Compound
Element
Mixture
Solution

Q4. Solid changes directly to gas by
Condensation
Deposition
Freezing
Sublimation

Q5. A compound
Has a fixed ratio of constituent atoms
Can be separated physically
Retains properties of elements
Has variable composition

Q6. Orderly arrangement of particles is a feature of
Liquids
Solids
Gases
Plasma

Q7. Standard for atomic mass is
Carbon-14
Hydrogen
Oxygen
Carbon-12

Q8. Atomicity of nitrogen is
1
2
3
4

Q9. Fractional atomic mass is due to
Isotopes
Isobars
Isotones
Allotropes

Q10. Oxidation state of an element in free state is
+1
-1
+2
Zero

Q11. Fluorine is the best oxidizing agent because it is
Most electronegative
Largest atom
Most metallic
Least reactive

Q12. Oxidation is
Decrease in oxidation number
Increase in oxidation number
Gain of neutrons
Loss of protons

Q13. Reduction is
Increase in oxidation number
Gain of protons
Loss of neutrons
Decrease in oxidation number

Q14. Rusting of iron is a
Hydrolysis
Redox reaction
Neutralization
Decomposition

Q15. Hydrogen in LiH has oxidation number
-1
+1
0
+2

Q16. Oxygen in O₂ has oxidation number
-2
+2
+1
0

Q17. An element with different mass numbers is said to have
Isotopes
Isobars
Allotropes
Isomers

Q18. 1 atomic mass unit is approximately
1.6605 × 10⁻²⁵ kg
1.6605 × 10⁻²⁷ kg
9.11 × 10⁻³¹ kg
6.022 × 10²³ kg

Q19. Carbon-12 contains
12 atoms
1 atom
12 moles
6.022 × 10²³ atoms per mole

Q20. A compound can be separated into elements only by
Physical methods
Chemical methods
Filtration
Distillation

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