1. The purest form of matter is called
(A) Compound
(B) Matter
(C) Element
(D) Mixture
2. The smallest particle of an element that shows all its properties is called
(A) Atom
(B) Molecule
(C) Neutron
(D) Nucleus
3. The positive ion is called
(A) Anion
(B) Radical
(C) Cation
(D) Chemical reaction
4. The combining capacity of an element is called
(A) Radical
(B) Chemical reaction
(C) Ion
(D) Valency
5. The valency of sodium ion is
(A) 1
(B) 2
(C) +1
(D) +2
6. The abbreviated name of an element is called
(A) Valency
(B) Symbol
(C) Molecule
(D) Atom
7. Which one is a radical?
(A) SO₄²⁻
(B) Cl
(C) Na
(D) S
8. The molecular mass of sulphuric acid is
(A) 96
(B) 97
(C) 99
(D) 98
9. The symbol of silver is
(A) Ag
(B) Hg
(C) Au
(D) Mg
10. The chemical reaction between an acid and base is called
(A) Addition
(B) Displacement
(C) Neutralisation
(D) Hydrolysis
11. The chemical reaction between an acid and base results in formation of a salt and ______
(A) Water
(B) Hydrogen
(C) Oxygen
(D) All of these
12. The chemical reaction in which one of the reactants must be water is called
(A) Hydrolysis
(B) Displacement
(C) Addition
(D) Neutralisation
13. The atomic number is represented by
(A) A
(B) Z
(C) D
(D) K
14. A substance that cannot be further divided into simpler substances by physical or chemical means is called
(A) Compound
(B) Matter
(C) Element
(D) Mixture
15. A substance containing two or more elements combined together in a fixed ratio by mass is called
(A) Compound
(B) Mixture
(C) Atom
(D) Molecule
16. Such a change in which a new product is formed is called
(A) Chemical change
(B) Physical change
(C) Anion
(D) Ion
17. An atom or group of atoms carrying a charge is called
(A) Physical change
(B) Ion
(C) Anion
(D) Chemical change
18. The capacity of elements to lose or gain electrons to complete outermost shell is called ______
(A) Valency
(B) Radical
(C) Ion
(D) Chemical reaction
19. ______ is also called proton number
(A) Displacement reaction
(B) Atomic number
(C) Double displacement reaction
(D) Atomic mass
20. The number of atoms present in one molecule of an element is called
(A) Equation
(B) Isotope
(C) Isobar
(D) Atomicity