Long QuestionsFundamentals of Chemistry – MCQ’s
- The branch of chemistry which deals with the study of all elements and their compounds except compounds of carbon and hydrogen and their derivatives is called.
(a) Organic chemistry
(b) Physical chemistry
(c) Inorganic chemistry ✓
(d) Bio chemistry
- Which one of the followings provides the identity of a substance?
(a) Qualitative analysis ✓
(b) Clinical analysis
(c) Quantitative analysis
(d) Chemical analysis
- Which one of the followings is applicable in chemical industry like metallurgy, ceramics and glass?
(a) Organic chemistry
(b) Inorganic chemistry ✓
(c) Industrial chemistry
(d) Nuclear chemistry
- Anything that has mass and occupies space is called:
(a) Substance
(b) Matter ✓
(c) Element
(d) Atomic mass
- The number of elements known in early ages is:
(a) 118
(b) 109
(c) 63
(d) 9 ✓
- Until the end of 19th century how many elements were discovered?
(a) 9
(b) 63 ✓
(c) 92
(d) 118
- The percentage of aluminum in crust of earth is:
(a) 47%
(b) 28% ✓
(c) 7.8%
(d) 1.8%
- Which one of the following elements is liquid at room temperature?
(a) Bromine
(b) Mercury
(c) Nitrogen
(d) Both a & b ✓
- Piece of matter in pure form is called:
(a) Mixture
(b) Matter
(c) Substance ✓
(d) Compound
- The quantity of potassium, magnesium, sulphur and sodium in human body is:
(a) 0.2%
(b) 0.6%
(c) 0.8% ✓
(d) 0.4%
- The unique property of an element is called:
(a) Electronegativity
(b) Valency ✓
(c) Mobility
(d) Oxidation number
- In water fixed ratio of hydrogen and oxygen by mass is:
(a) 8:1
(b) 2:16
(c) 1:8 ✓
(d) 2:1
- The mixture which has uniform composition throughout is called:
(a) Simple mixture
(b) homogeneous mixture ✓
(c) Heterogeneous mixture
(d) Compound mixture
- Which one of the followings is the mixture of oxygen, nitrogen and carbon dioxide?
(a) Soil
(b) Water
(c) Air ✓
(d) Brass
- The sum of protons and neutrons in the nucleus of an atom is called:
(a) Atomic number
(b) Mass number ✓
(c) Formula mass
(d) Atomic mass unit
- A substance whose atoms have the same atomic number is called:
(a) Element ✓
(b) Substance
(c) Mixture
(d) Compound
- H2O is an example of:
(a) Radical cation
(b) Radical anion
(c) Compound ✓
(d) Element
- One mole of any material contains chemical units equal to:
(a) 6.02×1023 ✓
(b) 6.02×1024
(c) 6.02×10-24
(d) 6.02×1025
- Ion, molecular ions, free radicals and neutral molecules are called:
(a) Ionic species
(b) Molecular species
(c) Chemical species ✓
(d) Atomic species
- Noble gases are the best examples of:
(a) Mono atomic molecules ✓
(b) Hetero atomic molecules
(c) Poly atomic molecules
(d) Diatomic molecules
- Brass is the mixture of:
(a) Cu+Zn ✓
(b) Cu+Pb
(c) Zn+Pb
(d) Sn+Cu
- The molar mass of H3PO4 is:
(a) 58.5g
(b) 98g ✓
(c) 40g
(d) 98amu
- The number of particles in one mole of a substance is called:
(a) Atomic number
(b) Particle number
(c) Avogadro’s number ✓
(d) Mass number
- 1amu (atomic mass unit) is equivalent to:
(a) 1.66×1023g
(b) 1.66×10-24g ✓
(c) 1.66×10-23g
(d) 6.02×10-25
- The sum of atomic masses of all the atoms in one formula unit of a substance is called:
(a) Atomic mass
(b) Mass number
(c) Formula mass ✓
(d) Atomic mass unit
- Which one of the followings shows the simplest whole number ratio of atoms in a substance?
(a) Molecular formula
(b) Empirical formula ✓
(c) Chemical formula
(d) Covalent formula
- Chemical formula of washing soda is:
(a) Na2CO3.H2O
(b) Na2CO3.10H2O ✓
(c) Na2CO3.7H2O
(d) Na2CO3
- Mass of an electron is:
(a) 5.486×10-4amu ✓
(b) 9.106×10-28amu
(c) 1.672×10-24 g
(d) 1.677×10-24 g
- Which one of the followings is a reactive species?
(a) Molecule
(b) Molecular ion ✓
(c) Compound
(d) Formula unit
- An atom or group of atoms having odd number of electrons is called:
(a) Radical
(b) Ion
(c) Free radical ✓
(d) Molecular ion
- Which one of the followings is tri atomic molecule?
(a) H2SO4
(b) N2
(c) CO2✓
(d) HCl
- The formula mass of an ionic compound expressed in grams is called
(a) Gram formula mass
(b) Gram formula
(c) Mole
(d) All of these ✓
- The total number of ions in one mole of NaCl is:
(a) 12.04×1023 ions ✓
(b) 1.204×1023 ions
(c) 6.04×1023 ions
(d) 61.04×1023 ions
- Number of moles×6.02×1023 is equal to:
(a) Number of moles
(b) Number of particles ✓
(c) Mass of substance
(d) Mass of particles
- The symbol for nitride radical is:
(a) CO23
(b) N3-✓
(c) PO3-4
(d) S2O2-3
- It is a liquid element at room temperature
(a) Mercury ✓
(b) Nickel
(c) Hydrogen
(d) Iodine
- Mass of proton is equivalent to:
(a) 1.672×10-24amu
(b) 16.72×10-24g
(c) 1.672×1024g
(d) 1.672×10-24g ✓
- The number of neutrons in 92U238 is:
(a) 194
(b) 92
(c) 146 ✓
(d) 238
- An atom or group of atoms having positive charge on it is called:
(a) Cation ✓
(b) Anion
(c) Molecule
(d) Atom
- Which of the followings shows variable valency?
(a) Ca
(b) Fe ✓
(c) B
(d) I
- Which one of the following elements is found most abundantly in the earth crust?
(a) Oxygen ✓
(b) Aluminium
(c) Silicon
(d) Iron
- The third abundant gas found in the atmosphere is:
(a) Carbon monoxide
(b) Oxygen
(c) Nitrogen
(d) Argon ✓
- Total number of elements which have been discovered till now are:
(a) 110
(b) 115
(c) 118 ✓
(d) 102
- Which element is found in liquid state?
(a) Gold
(b) Bromine ✓
(c) Lead
(d) Silver
- The compound which has same empirical formula is:
(a) C6H6
(b) C6H12O6
(c) CH3COOH
(d) Both b and c ✓
- CaO is the chemical formula of:
(a) Lime stone
(b) Quick lime ✓
(c) Caustic soda
(d) Slaked lime
- How many elements occur naturally?
(a) 92 ✓
(b) 96
(c) 98
(d) 100
- is the symbol of which one of the following?
(a) Ammonium ion
(b) Cyanide
(c) Bisulphate ✓
(d) Bicarbonate
- The formula mass of K2SO4 is:
(a) 174 amu ✓
(b) 174 g
(c) 170 amu
(d) 170 g
- Which one of the followings has sharp and fixed melting point?
(a) Compound ✓
(b) Mixture
(c) Both
(d) None of these
Everything is good but your 7th mcq in chapter 1 chemistry is wrong as it says that aluminium is 28 percent but it is 7.8 percent in the Earth’s crust.please see to it.
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It’s good sir