21. The total number of protons and neutrons in the nucleus is equal to which of the following?
(a) Atomic number
(b) Atomic mass unit
(c) Mass number
(d) None of these
answer
(c) Mass number
22. The simplest formula which shows the smallest whole number ration of the atoms, of the different elements present in a compound?
(a) Empirical formula
(b) Chemical formula
(c) Molecular formula
(d) Formula unit
answer
(a) Empirical formula
23. Which of the following accurately depicts the actual amount of atoms from various elements that make up a compound’s molecule?
(a) Empirical formula
(b) Chemical formula
(c) Molecular formula
(d) Formula unit
answer
(c) Molecular formula
24. What smallest repeating unit of an ionic composition displays the straightforward ion ratio?
(a) Empirical formula
(6) Chemical formula
(b) Molecular formula
(d) Formula unit
answer
(d) Formula unit
25. What is the total mass of the ions (atoms) in an ionic compound’s formula unit?
(a) Molecular mass
(b) Formula unit b
(c) Formula mass
(d) None of these
answer
(c) Formula mass
26. What is the name of the particle that carries an electrical charge, either positive or negative, as a result of the gain or loss of one or more electrons?
(a) ion
(b) Anion
(c) catioon
(d) None of these
answer
(a) ion
27. When one or more electrons are lost or gained, a particle is created that carries an electrical charge, either positive or negative. What is this particle known as?
(a) lon
(b) Anion
(c) cation
(d) None of these
answer
(b) Anion
28. Which one of the, following group consist, of element.
(a) Mercury. Water, ammonia
(b) Copper, aluminum, methane
(c) Iodine, tin, iron
(c) Coal, smoke, fog
answer
(c) Iodine, tin, iron
29. Which of the following can be divided into more basic components?
(a) Ammonia
(b) Sulphur
(b) Oxygen
(d) Iron filling
answer
(a) Ammonia
30. The gram molecular, mass of HNO is?
(b) 100
(a) 60
(c) 63
(d) 98
answer
(c) 63
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