1. . The purest form of matter is called
(A) ion
(B) molecule
(C) mixture
(D) element
2. . The smallest particle of an element that shows all its properties is called
(A) molecule
(B) neutron
(C) atom
(D) nucleus
3. . The positive ion is called
(A) anion
(B) radical
(C) chemical reaction
(D) cation
4. . The combining capacity of an element is called
(A) radical
(B) valency
(C) ion
(D) chemical reaction
5. . One mole of water is equal to grams
(A) 16
(B) 18
(C) 17
(D) 19
6. . The chemical reaction between an acid and base is called
(A) displacement
(B) Neutralisation
(C) addition
(D) hydrolysis
7. . The chemical reaction between an acid and base results in the formation of a salt and
(A) Hydrogen
(B) oxygen
(C) water
(D) nitrogen
8. . Keeps their identity during a chemical reaction
(A) radical
(B) molecule
(C) compound
(D) ion
9. . The chemical reaction in which one of the reactant must be water is called
(A) hydrolysis
(B) displacement
(C) addition
(D) Neutralisation
10. . The atomic number is represented by
(A) Z
(B) A
(C) D
(D) K
11. . The impure form of matter consisting of different kinds of elements or compounds is called
(A) compound
(B) atom
(C) mixture
(D) molecule
12. . Is also called proton number
(A) atomic number
(B) double displacement reaction
(C) displacement reaction
(D) atomic mass
13. . Such a change in which a new product is formed is called
(A) chemical change
(B) physical change
(C) anion
(D) ion
14. . A negative ion is called
(A) physical change
(B) anion
(C) chemical change
(D) ion
15. . The symbol of gold is
(A) Au
(B) Fe
(C) Hg
(D) K
16. . The word 'Chyma' means
(A) To heat
(B) freezing
(C) bending
(D) melt or mould
17. . The quantity of a substance that describes its parameters and admitted internationally is called
(A) atom
(B) unit
(C) Mole
(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/cm²
(C) g/cm³
(D) g/mm