1. . The purest form of matter is called:
(A) Compound
(B) Matter
(C) Mixture
(D) Element
2. . The smallest particle of an element that shows all its properties is called:
(A) Molecule
(B) Nucleus
(C) Neutron
(D) Atom
3. . The positive ion is called:
(A) Anion
(B) Cation
(C) Radical
(D) Chemical reaction
4. . The combining capacity of an element is called:
(A) Valency
(B) Radical
(C) Ion
(D) Chemical reaction
5. . The valency of sodium ions is:
(A) 1
(B) +2
(C) 2
(D) +1
6. . The abbreviated name of an element is called:
(A) Valency
(B) Atom
(C) Molecule
(D) Symbol
7. . Which one is radical?
(A) Na
(B) SO₄²⁻
(C) Cl
(D) S
8. . The molecular mass of sulphuric acid is:
(A) 96
(B) 98
(C) 97
(D) 99
9. . The symbol of silver is:
(A) Ag
(B) Hg
(C) Au
(D) Mg
10. . The matter can neither be created nor destroyed during a physical or chemical change. It is called:
(A) Law of conservation of mass
(B) Law of constant proportions
(C) Law of multiple proportions
(D) Law of reciprocal proportions
11. . Different pure samples of the same compound contain elements in the same fixed ratio by weight. It is called:
(A) Law of conservation of mass
(B) Law of reciprocal proportions
(C) Law of multiple proportions
(D) Law of constant proportions
12. . H₂O and H₂O₂ follow the law of:
(A) Law of conservation of mass
(B) Law of constant proportions
(C) Law of reciprocal proportions
(D) Law of multiple proportions
13. . The compounds that do not obey the law of constant proportions are called:
(A) Bertholides
(B) Daltonides
(C) Isotopes
(D) Alloys
14. . A substance that cannot be further divided into simpler substances is called:
(A) Compound
(B) Matter
(C) Mixture
(D) Element
15. . A substance containing two or more elements combined in a fixed ratio by mass is called:
(A) Atom
(B) Mixture
(C) Compound
(D) Molecule
16. . Such a change in which a new product is formed is called:
(A) Physical change
(B) Ion
(C) Anion
(D) Chemical change
17. . An atom or group of atoms carrying a charge is called:
(A) Physical change
(B) Chemical change
(C) Anion
(D) Ion
18. . The capacity of elements to lose or gain electrons is called:
(A) Radical
(B) Chemical reaction
(C) Ion
(D) Valency
19. . ................. is also called the proton number:
(A) Displacement reaction
(B) Double displacement reaction
(C) Atomic number
(D) Atomic mass
20. . The number of atoms present in one molecule of an element is called:
(A) Equation
(B) Isobar
(C) Atomicity
(D) Isotope