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) neutron
(C) atom
(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) valency
(B) radical
(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) hydrolysis
(B) displacement
(C) addition
(D) Neutralisation
7. The chemical reaction between an acid and base results in the formation of a salt and
(A) water
(B) Hydrogen
(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) hydrolysis
(C) addition
(D) displacement
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) mixture
(B) compound
(C) atom
(D) molecule
12. _____ is also called proton number
(A) displacement reaction
(B) atomic number
(C) double displacement reaction
(D) atomic mass
13. Such a change in which a new product is formed is called
(A) physical change
(B) anion
(C) chemical change
(D) ion
14. A negative ion is called
(A) anion
(B) chemical change
(C) physical change
(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) unit
(B) Mole
(C) atom
(D) molecule
18. The unit of temperature in S.I system is
(A) mole
(B) centigrade
(C) Kelvin
(D) kinetic energy
19. The mass per unit volume of a substance is called
(A) Volume
(B) mole
(C) density
(D) pressure
20. The unit of density is called
(A) g/cm
(B) g/cm²
(C) g/cm³
(D) g/mm