Class 11 Chemistry MCQs Some Basic Concepts Of Chemistry for JEE/NEET

Here, you will get Class 11 Chemistry MCQ of Chapter 1 Some Basic Concepts Of Chemistry for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 11 Chemistry Chapter 1 Some Basic Concepts Of Chemistry, you will get the confidence to crack JEE or NEET. Practice MCQ Questions for Class 11 Chemistry with Answers on a daily basis and score well in exams. 

Some Basic Concepts Of Chemistry Class 11 MCQs Questions with Answers

Calculate the number of oxygen atoms in 50 g of CaCO3
(a) 6.033×1023 atoms
(b) 9.033×1023 atoms
(c) 8.033×1023 atoms
(d) 3.033×1023 atoms

Answer: (b) 9.033×1023 atoms

Which of the following pairs have the same number of atoms?
(a) 16 g of O2(g) and 4 g of H2(g)
(b) 16 g of O2 and 44 g of CO2
(c) 28 g of N2 and 32 g of O2
(d) 12 g of C(s) and 25 g of Na(s)

Answer: (c) 28 g of N2 and 32 g of O2

Which of the following statements about a compound is incorrect?
(a) A molecule of a compound has atoms of different elements.
(b) A compound cannot be separated into its constituent elements by physical methods of separation.
(c) A compound retains the physical properties of its constituent elements.
(d) The ratio of atoms of different elements in a compound is fixed

Answer: (c) A compound retains the physical properties of its constituent elements.

How many mL of water must be added to 200 mL of .65 M HCL to dilute the solution to .20 M
(a) 450 mL
(b) 400 mL
(c) 350 mL
(d) 500 mL

Answer: (a) 450 mL

Which of the following has the largest number of atoms
(a) 0.5 g-atoms of Cu
(b) 0.635 g Cu
(c) 0.25 moles of Cu atoms
(d) 1g of Cu

Answer: (a) 0.5 g-atoms of Cu

A measured temperature on Fahrenheit scale is 200°F. What will this reading be on Celsius scale?
(a) 40°C
(b) 94°C
(c) 93.3°C
(d) 30°C

Answer: (c) 93.3°C

Which of the following reactions is not correct according to the law of conservation of mass
(a) 2Mg(s)+O2(g)→2MgO(s)
(b) C3H8(g)+O2(g)→CO2(g)+H2O(g)
(c) P4(s)+5O2(g)→P4O10(s)P4(s)+5O2(g)→P4O10(s)
(d) CH4(g)+2O2(g)→CO2(g)+2H2O(g)

Answer: (b) C3H8(g)+O2(g)→CO2(g)+H2O(g)

The number of gram molecules of oxygen in 6.02×1024 CO molecules is
(a) 10 gm-molecules
(b) 5 gm-molecules
(c) 1 gm -molecules
(d) .5 gm-molecules

Answer: (b) 5 gm-molecules

The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are
(a) 3,3 and 3 respectively
(b) 3,4 and 4 respectively
(c) 3,4 and 5 respectively
(d) 3,3 and 4 respectively

Answer: (a) 3,3 and 3 respectively

Calculate the standard molar volume of oxygen gas. The density of O2 gas at NTP is 1.429g/L.
(a) 22.39 Litres
(b) 21.2 Litres
(c) 24 Litres
(d) None of the above

Answer: (a) 22.39 Litres

81.4 g sample of ethyl alcohol contains 0.002 g of water. The amount of pure ethyl alcohol to the proper number of significant figures is
(a) 81.398 g
(b) 71.40 g
(c) 91.4 g
(d) 81 g

Answer: (a) 81.398 g

What is the concentration of nitrate ions if equal volumes of 0.1 MAgNO3 and 0.1 M NaCl are mixed together
(a) 0.1 M
(b) 0.2 M
(c) 0.05 M
(d) 0.25 M

Answer: (c) 0.05 M

An atom is 10 times heavier than 1/12th of mass of a carbon atom (C – 12). The mass of the atom in a.m.u. is
(a) 10
(b) 120
(c) 1.2
(d) 12

Answer: (a) 10

Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (At. wt. of Fe = 56) present in one molecule of haemoglobin is
(a) 6
(b) 1
(c) 4
(d) 2

Answer: (c) 4

Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be
(a) 26.89
(b) 8.9
(c) 17.8
(d) 26.7

Answer: (a) 26.89

One mole of calcium phosphide on reaction with excess of water gives
(a) One mole of phosphine
(b) Two moles of phosphoric acid
(c) Two moles of phosphine
(d) One mole of phosphorous pentoxide

Answer: (c) Two moles of phosphine

Irrespective of the source, pure sample, of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of
(a) Conservation of Mass
(b) Multiple Proportions
(c) Constant Composition
(d) Constant Volume

Answer: (c) Constant Composition

An aqueous solution of 6.3 g of oxalic acid dihydrate is made upto 250 ml. The volume of 0.1 N NaOH required to completely neutralise 10 ml of this solution is
(a) 40 ml
(b) 20 ml
(c) 10 m
(d) 4 ml

Answer: (a) 40 ml

Under similar conditions of pressure and temperature, 40 ml of slightly moist hydrogen chloride gas is mixed with 20 ml of ammonia gas, the final volume of gas at the same temperature and pressure will be
(a) 100 ml
(b) 20 ml
(c) 40 ml
(d) 60 ml

Answer: (b) 20 ml

The percentage of nitrogen in urea is about
(a) 46
(b) 85
(c) 18
(d) 28

Answer: (a) 46

Which of the following weighs the most?
(a) One g – atom of nitrogen
(b) One mole of water
(c) One mole of sodium
(d) One molecule of H2SO4

Answer: (c) One mole of sodium

The total number of ions present in 111 g of CaCl2 is
(a) One Mole
(b) Two Mole
(c) Three Mole
(d) Four Mole

Answer: (c) Three Mole

Which of the following is a homogeneous mixture?
(a) Mixture of soil and water
(b) Sugar solution
(c) Mixture of sugar, salt and sand
(d) Iodised table salt

Answer: (b) Sugar solution

The prefix 1018 is
(a) giga
(b) exa
(c) kilo
(d) mega

Answer: (b) exa

Which of the following contains same number of carbon atoms as are in 6.0 g of carbon (C – 12)?
(a) 6.0 g Ethane
(b) 8.0 g Methane
(c) 21.0 g Propane
(d) 28.0 g CO

Answer: (b) 8.0 g Methane

The number of significant figures in 6.02 x 1023 is
(a) 23
(b) 3
(c) 4
(d) 26

Answer: (b) 3

An organic compound contains carbon , hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be
(a) CHO
(b) CH4O
(c) CH3O
(d) CH2O

Answer: (c) CH3O

Which of the following cannot give iodometric titrations
(a) Fe3+
(b) Cu2+
(c) Pb2+
(d) Ag+

Answer: (c) Pb2+

A symbol not only represents the name of the element but also represents
(a) Atomic Mass
(b) Atomic Number
(c) Atomicity
(d) Atomic Volume

Answer: (c) Atomicity

The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with ZnSO4.7H2O. The atomic weight of M is
(a) 40.3
(b) 36.3
(c) 24.3
(d) 11.3

Answer: (c) 24.3

Difference in density is the basis of
(a) gravity separation
(b) molecular sieving
(c) ultrafiltration
(d) molecular attraction

Answer: (a) gravity separation

Which of the following substances cannot be separated in
(a) Solid glucose
(b) Salt and sugar
(c) Sugar and water solution
(d) None of these

Answer: (a) Solid glucose

7.5 grams of a gas occupy 5.6 litres of volume at STP. The gas is
(a) NO
(b) N2O
(c) CO
(d) CO2

Answer: (a) NO

Which one of the following set of units represents the smallest and largest amount of energy respectively?
(a) eV and L-atm
(b) erg and cal
(c) J and erg
(d) cal and eV

Answer: (a) eV and L-atm

An atom is 10 times heavier than 1/12th of mass of a carbon atom (C – 12). The mass of the atom in a.m.u. is
(a) 10
(b) 120
(c) 1.2
(d) 12

Answer: (a) 10

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