1. . The purest form of matter is called
(A) Ion
(B) Molecule
(C) Element
(D) Mixture
2. . The smallest particle of an element that shows all its properties is called
(A) Molecule
(B) Atom
(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) Valency
(C) Ion
(D) Chemical reaction
5. . The one mole of water is equal to grams
(A) 16
(B) 17
(C) 18
(D) 19
6. . The chemical reaction between an acid and base is called
(A) Neutralisation
(B) Displacement
(C) Addition
(D) Hydrolysis
7. . The chemical reaction between an acid and base results in the formation of a salt and
(A) Hydrogen
(B) Water
(C) Oxygen
(D) Nitrogen
8. . Keeps their identity during a chemical reaction
(A) Radical
(B) Ion
(C) Compound
(D) Molecule
9. . The chemical reaction in which one of the reactant must be water is called
(A) Neutralisation
(B) Displacement
(C) Addition
(D) Hydrolysis
10. . The atomic number is represented by
(A) A
(B) Z
(C) D
(D) K
11. . The impure form of matter consisting of different kinds of elements or compounds is called
(A) Compound
(B) Mixture
(C) Atom
(D) Molecule
12. . ____________ is also called proton number
(A) Displacement reaction
(B) Double displacement reaction
(C) Atomic number
(D) Atomic mass
13. . Such a change in which a new product is formed is called
(A) Physical change
(B) Chemical change
(C) Anion
(D) Ion
14. . A negative ion is called
(A) Physical change
(B) Chemical change
(C) Anion
(D) Ion
15. . The symbol of gold is
(A) Fe
(B) Au
(C) Hg
(D) K
16. . The word 'Chyma' means
(A) To heat
(B) Melt or mould
(C) Bending
(D) Freezing
17. . The quantity of a substance that describes its parameters and admitted internationally is called
(A) Mole
(B) Unit
(C) Atom
(D) Molecule
18. . The unit of temperature in S.I system is
(A) Kelvin
(B) Centigrade
(C) Mole
(D) Kinetic energy
19. . The mass per unit volume of a substance is called
(A) Volume
(B) Density
(C) Mole
(D) Pressure
20. . The unit of density is called
(A) g/cm
(B) g/cm³
(C) g/cm²
(D) g/mm