Chemistry Question and answer on Stoichiometry

Find the correct answer by clicking on the choice given.

1. If 16 grams of O2 react with excess C2H6, how many grams of CO2 will be formed? The formula mass of O2 = 32 amu and the formula mass of CO2 = 44 amu. The balanced chemical equation is...
	(a)	22 grams
	(b)	13 grams
	(c)	9 grams
	(d)	7 grams
2. If 64 grams of O2 react with 45 grams of C2H6, how many grams of CO2 will be formed? The formula mass of O2 = 32 amu, C2H6 = 30 and the formula mass of CO2 = 44 amu. The balanced chemical equation is given in the previous problem.
	(a)	132 grams
	(b)	66 grams
	(c)	50 grams
	(d)	44 grams
3. How many milliliters of 2 M NaCl solution are required to make 1 liter of 0.4 M NaCl solution?
	(a)	5,000 mL
	(b)	800 mL
	(c)	200 mL
	(d)	0.2 mL
4. If an air bag in a car needs 44.8 L of gas when filled, how many grams of NaN3 are needed to fill the bag with nitrogen gas at standard temperature and pressure? Remember that one mole of any gas will occupy 22.4 L at STP. The balanced chemical is...
	(a)	56 grams
	(b)	87 grams
	(c)	130 grams
	(d)	1.3 grams

5. How many grams of NaOH are needed to make 100 milliliters of a 0.2 molar solution of NaOH?
	(a)	0.02 grams
	(b)	0.8 grams
	(c)	20 grams
	(d)	800 grams
6. How many grams of NaHCO3 (baking soda) would you need to neutralize 500 mL of battery acid (H2SO4) that has been spilled on your garage floor? Assume that the concentration of the battery acid is 12 molar. The balanced chemical equation is...
	(a)	1,008,000 grams
	(b)	1,008 grams
	(c)	504 grams
	(d)	252 grams

7. When 157.0 grams of CaSO4 are dissolved in enough water to yield a volume of  7.25x102 milliliters of solution. The molarity of this solution will be...
	(a)	0.0016 M
	(b)	0.837 M
	(c)	1.15 M
	(d)	1.59 M
8. How many grams of carbon are needed to completely react with 75.2 g of SiO2? The balanced chemical equation is...
	(a)	3.76 g
	(b)	15.1 g
	(c)	36.0 g
	(d)	45.1 g
9. How many milliliters of 4.00 M NaOH must be added to 100.0 mL of 0.2000 M H2SO4 solution to completely neutralize the acid? The balanced chemical equation is...
	(a)	0.04 mL
	(b)	5.0 mL
	(c)	10.0 mL
	(d)	500 mL
10. In an acid-base titration, 42.90 mL of 0.825 M H2SO4 was required to neutralize 75.0 mL of NaOH solution. What is the molarity of the NaOH solution? The balanced chemical equation is given in the previous problem.
	(a)	0.0009 M
	(b)	0.071 M
	(c)	0.472 M
	(d)	0.944 M
11. If you react 1.00 L of ethane at STP with 3.00 L of oxygen at STP, how many grams of carbon dioxide will be formed? One mole of any gas occupies 22.4 L at STP. The balanced chemical equation is...
	(a)	1.96 g
	(b)	3.37 g
	(c)	3.93 g
	(d)	5.89 g
12. What is the percent yield of water if 0.90 g of water is obtained when 29.0 g of butane is burned in excess oxygen? The balanced chemical equation is...
	(a)	0.02%
	(b)	2%
	(c)	10%
	(d)	36%
13. One of the functions of the catalytic converter in your car is to oxidize carbon monoxide to carbon dioxide. If 15.0 g of carbon monoxide reacts with 9.0 g of oxygen, how many grams of which compound remains unreacted? The balanced chemical equation is...
	(a)	0.4 g of oxygen remains unreacted
	(b)	0.8 g of carbon monoxide remains unreacted
	(c)	7.1 g of carbon monoxide remains unreacted
	(d)	8.1 g of oxygen remains unreacted

Practice chemistry entrance questions online

Chemistry Objective Type Questions with Answers for the preparation of Engineering Entrance Test like AIEEE, IIT-JEE, CET etc.


(1) Due to the presence of an unpaired electron, free radicals are:

(a) Chemically reactive
(b) Chemically inactive
(c) Anions
(d) Cations

Answer (a) Chemically reactive

(2) Lattice energy of an ionic compounds depends upon

(a) Charge on the ion only
(b) Size of the ion only
(c) Packing of ions only
(d) Charge on the ion and size of the ion

Answer (d) Charge on the ion and size of the ion

(3) The highest electrical conductivity of the following aqueous solutions is of

(a) 0.1 M acetic acid
(b) 0.1 M chloroacetic acid
(c) 0.1 M fluoroacetic acid
(d) 0.1 M difluoroacetic acid

Answer (d) 0.1 M difluoroacetic acid

(4) Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?

(a) The most probable speed increases
(b) The fraction of the molecules with the most probable speed increases
(c) The distribution becomes broader
(d) The area under the distribution curve remains the same as under the lower temperature

Answer (b) The fraction of the molecules with the most probable speed increases

(5) Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture?

(a) 1.20 M
(b) 1.50 M
(c) 1.344 M
(d) 2.70 M

Answer (c) 1.344 M

(6) A reaction involving two different reactants can never be

(a) Unimolecular reaction
(b) First order reaction
(c) second order reaction
(d) Bimolecular reaction

Answer (a) Unimolecular reaction

(7) If we consider that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

(a) Decrease twice
(b) Increase two fold
(c) Remain unchanged
(d) Be a function of the molecular mass of the substance

Answer (c) Remain unchanged

(8) In a multi – electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic acid and electric fields?
(1) n = 1, l = 0, m = 0
(2) n = 2, l = 0, m = 0
(3) n = 2, l = 1, m = 1
(4) n = 3, l = 2, m = 1
(5) n = 3, l = 2, m = 0

(a) (a) and (b)
(b) (b) and (c)
(c) (c) and (d)
(d) (d) and (e)

Answer (d) (d) and (e)

(9) During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’ These are

(a) Sn and Ag
(b) Pb and Zn
(c) Ag and Au
(d) Fe and Ni

Answer (c) Ag and Au

(10) The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively, which of the following statements is NOT correct?

(a) magnesium chloride solution coagulates, the gold sol more readily than the iron
(III) hydroxide sol.
(b) sodium sulphate solution causes coagulation in both sols
(c) mixing the sols has no effect
(d) coagulation in both sols can be brought about by electrophoresis

Answer (c) mixing the sols has no effect

Objective Questions on Carboxylic Acids and Amino Acids

Find the correct answer by clicking on the choice given. 1. Which of the following compounds is the strongest Brønsted acid?
2. What is the major product of the following reaction?
3. The best synthesis of the following compound, 2-methylpropanoic acid, will be...
4. Which of the following represents serine at a pH = 1?
5. Which of the following represents tyrosine at a pH = 12?
6. Which of the following is an intermediate in the mechanism of the acid catalyzed formation of an ester?

Chemistry exam questions for common entrance exam

Chemistry Objective Type Questions with Answers for the preparation of Engineering Entrance Test like AIEEE, IIT-JEE, CET etc. (For Science Students)


(1) The ionic mobility of alkali metal ions in aqueous solution is maximum for

(a) K+
(b) Rb+
(c) Li+
(d) Na+

Answer (b) Rb+

(2) Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is

(a) 1.14 mol kg–1
(b) 3.28 mol kg–1
(c) 2.28 mol kg–1
(d) 0.44 mol kg–1

Answer (c) 2.28 mol kg–1

(3) How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with a Ca2+ ion?

(a) Six
(b) Three
(c) One
(d) Two

Answer (c) One

(4) 18 g of glucose (C6H12O6) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at 100oC is

(a) 759.00 Torr
(b) 7.60 Torr
(c) 76.00 Torr
(d) 752.40 Torr

Answer (d) 752.40 Torr

(5) Which of the following oxides is amphoteric in character?

(a) CaO
(b) CO2
(c) SiO2
(d) SnO2

Answer (d) SnO2

(6) If α is the degree of dissociation of Na2SO4, the vant Hoff’s factor (i) used for calculating the molecular mass is

(a) 1 + α
(b) 1 - α
(c) 1 + 2 α
(d) 1 – 2 α

Answer (c) 1 + 2 α

(7) Hydrogen bomb is based on the principle of

(a) Nuclear fission
(b) Natural radioactivity
(c) Nuclear fusion
(d) Artificial radioactivity

Answer (c) Nuclear fusion

(8) An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be

(a) AB
(b) A2B
(c) AB3
(d) A3B

Answer (c) AB3

(9) Which of the following is a polyamide?

(a) Teflon
(b) Nylon – 66
(c) Terylene
(d) Bakelite

Answer (b) Nylon – 66

(10) Which one of the following types of drugs reduces fever?

(a) Analgesic
(b) Antipyretic
(c) Antibiotic
(d) Tranquiliser

Answer (b) Antipyretic

Chemistry entrance exam for online practice

Chemistry Objective Type Questions with Answers for the preparation of Engineering Entrance Test like AIEEE, IIT-JEE, CET etc.

(1) In which of the following molecules/ions are all the bonds not equal?

(a) SF4
(b) SiF4
(c) XeF4
(d) 4 BF−

Answer (a) SF4

(2) Which one of the following sets of ions represents a collection of isoelectronic species?

(a) K+ , Cl–, Ca2+, Sc3+
(b) Ba2+, Sr2+, K+, S2–
(c) N3–, O2–, F–, S2–
(d) Li+, Na+, Mg2+, Ca2+

Answer (a) K+ , Cl–, Ca2+, Sc3+

(3) What products are expected from the disproportionation reaction of hypochlorous acid?

(a) HClO3 and Cl2O
(b) HClO2 and HClO4
(c) HCl and Cl2O
(d) HCl and HClO3

Answer (d) HCl and HClO3

(4) In Fe(CO)5, the Fe – C bond possesses

(a) π-character only
(b) both σ and π characters
(c) ionic character
(d) σ-character only

Answer (b) both σ and π characters

(5) Lanthanoid contraction is caused due to

(a) the appreciable shielding on outer electrons by 4f electrons from the nuclear charge
(b) the appreciable shielding on outer electrons by 5d electrons from the nuclear charge
(c) the same effective nuclear charge from Ce to Lu
(d) the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

Answer (d) the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

(6) In Langmuir’s model of adsorption of a gas on a solid surface

(a) the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered
(b) the adsorption at a single site on the surface may involve multiple molecules at the same time
(c) the mass of gas striking a given area of surface is proportional to the pressure of the gas
(d) the mass of gas striking a given area of surface is independent of the pressure of the gas

Answer (c) the mass of gas striking a given area of surface is proportional to the pressure of the gas

(7) Rate of a reaction can be expressed by Arrhenius equation as:
k = Ae−E/RT (where E/RT is read as power of e) In this equation, E represents

(a) the energy above which all the colliding molecules will react
(b) the energy below which colliding molecules will not react
(c) the total energy of the reacting molecules at a temperature, T
(d) the fraction of molecules with energy greater than the activation energy of the reaction

Answer (b) the energy below which colliding molecules will not react

(8) Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces

(a) 4-phenylcyclopentene
(b) 2-phenylcyclopentene
(c) 1-phenylcyclopentene
(d) 3-phenylcyclopentene

Answer (d) 3-phenylcyclopentene

(9) Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2-fluoroethanol is

(a) Eclipse, Gauche, Anti
(b) Gauche, Eclipse, Anti
(c) Eclipse, Anti, Gauche
(d) Anti, Gauche, Eclipse

Answer (c) Eclipse, Anti, Gauche

(10) Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?

(a) The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group
(b) In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group
(c) Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens
(d) In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

Answer (d) In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

Chemistry Questions for Entrance Test

Chemistry Objective Type Questions with Answers for the preparation of Engineering Entrance Test like AIEEE, IIT-JEE, CET etc.

(1) Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains

(a) mixture of o− and p−bromotoluenes
(b) mixture of o− and p−dibromobenzenes
(c) mixture of o− and p−bromoanilines
(d) mixture of o− and m−bromotoluenes

Answer (a) mixture of o− and p−bromotoluenes

(2) Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives

(a) 2,4,6-trinitrobenzene
(b) o-nitrophenol
(c) p-nitrophenol
(d) nitrobenzene

Answer (b) o-nitrophenol

(3) Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being

(a) 4f orbitals more diffused than the 5f orbitals
(b) lesser energy difference between 5f and 6d than between 4f and 5d orbitals
(c) more energy difference between 5f and 6d than between 4f and 5d orbitals
(d) more reactive nature of the actinoids than the lanthanoids

Answer (b) lesser energy difference between 5f and 6d than between 4f and 5d orbitals

(4) Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

(a) Metal sulphides are thermodynamically more stable than CS2
(b) CO2 is thermodynamically more stable than CS2
(c) Metal sulphides are less stable than the corresponding oxides
(d) CO2 is more volatile than CS2

Answer (a) Metal sulphides are thermodynamically more stable than CS2

(5) α-D-(+)-glucose and β-D-(+)-glucose are

(a) conformers
(b) epimers
(c) anomers
(d) enantiomers

Answer (c) anomers

(6) Which one of the following is the correct statement?

(a) Boric acid is a protonic acid
(b) Beryllium exhibits coordination number of six
(c) Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase
(d) B2H6.2NH3 is known as ‘inorganic benzene’

Answer (c) Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase

(7) Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is

(a) R4Si
(b) RSiCl3
(c) R2SiCl2
(d) R3SiCl

Answer (b) RSiCl3

(8) In a compound atoms of element Y from ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be

(a) X4Y3
(b) X2Y3
(c) X2Y
(d) X3Y4

Answer (a) X4Y3

(9) Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

(a) gets oxidised by oxalic acid to chlorine
(b) furnishes H+ ions in addition to those from oxalic acid
(c) reduces permanganate to Mn2+
(d) oxidises oxalic acid to carbon dioxide and water

Answer (c) reduces permanganate to Mn2+

(10) Which one of the following pairs of species have the same bond order?

(a) CN− and NO+
(b) CN− and CN+
(c) O− and CN−
(d) NO+ and CN+

Answer (a) CN− and NO+