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Some Basic Concepts of Chemistry

Some Basic Concepts of Chemistry for class xi/xii, medical entrance, pharma, engineering entrance and other competitive and entrance exams

25 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

The bond angle of water molecule in degree is

  1. 107
  2. 104
  3. 109
  4. 180
Question 2 Multiple Choice (Single Answer)

The substances which have fixed composition are called

  1. homogeneous mixtures
  2. hetrogeneous mixtures
  3. pure substances
  4. impure substances
Question 3 Multiple Choice (Single Answer)

When the temperature is 45 degree in the celcius scale, its value in the fahrenheit scale will be

  1. 100 F
  2. 113 F
  3. 318 F
  4. 273 F
Question 4 Multiple Choice (Single Answer)

When two or more atoms of different elements combine, we get

  1. a compound
  2. an element
  3. a mixture
  4. None of the above
Question 5 Multiple Choice (Single Answer)

What is the number of moles in 42 grams of nitrogen?

  1. 1 mole
  2. 2 moles
  3. 3 moles
  4. 4 moles
Question 6 Multiple Choice (Single Answer)

a.m.u. can also be called as

  1. unified mass
  2. mass
  3. standard mass
  4. atomic mass
Question 7 Multiple Choice (Single Answer)

According to Dalton

  1. molecule is indivisible
  2. atom is indivisible
  3. atoms contains charged particules
  4. atoms have mass
Question 8 Multiple Choice (Single Answer)

The amount of matter present in a substance is called

  1. weight
  2. mass
  3. number of moles
  4. volume
Question 9 Multiple Choice (Single Answer)

One mole of a substance contains mass equal to

  1. Molecular weight
  2. One gram
  3. 12 gram
  4. Atomic mass unit
Question 10 Multiple Choice (Single Answer)

The molecular weight of ammonia (in grams) is

  1. 27
  2. 17
  3. 14
  4. 20
Question 11 Multiple Choice (Single Answer)

The molecular weight of ethane is approximately equal to

  1. 16 a.m.u.
  2. 32 a.m.u.
  3. 34 a.m.u.
  4. 30 a.m.u.
Question 12 Multiple Choice (Single Answer)

The number of moles of solute per liter of solution is called its

  1. mole fraction
  2. molality
  3. molarity
  4. volume percentage
Question 13 Multiple Choice (Single Answer)

The number of moles of solute per kilogram of solvent is called

  1. mole fraction
  2. molality
  3. molarity
  4. mass percentage
Question 14 Multiple Choice (Single Answer)

Mole fraction can be defined as

  1. the number of moles of solute
  2. the number of moles of solvent
  3. the number of moles of the component divided by the total number of moles
  4. the total number of moles of solute and solvent
Question 15 Multiple Choice (Single Answer)

The molar volume is equal to

  1. 12.4 litre
  2. 22.1 litre
  3. 22.4 litre
  4. One litre
Question 16 Multiple Choice (Single Answer)

Calculate the molarity of a solution containing 3 moles of a substance in 250 ml. of water.

  1. 10 M
  2. 12 M
  3. 3 M
  4. 9 M
Question 17 Multiple Choice (Single Answer)

Calculate the mole fraction of 10 g. of NaOH in 18 g. of water.

  1. 1/18
  2. 1/16
  3. 1/5
  4. 1/11
Question 18 Multiple Choice (Single Answer)

The mass contained in unit volume of a substance is called its

  1. atomic mass
  2. molar mass
  3. mole fraction
  4. density
Question 19 Multiple Choice (Single Answer)

One a.m.u. is defined to be equal to

  1. mass of carbon
  2. mass of hydrogen
  3. one twelth of mass of carbon
  4. one half of mass of hydrogen
Question 20 Multiple Choice (Single Answer)

Limiting reagent is

  1. the reactant which is present in larger amount
  2. the reagent which is present in lesser amount
  3. the reactant which slows down the speed of reaction
  4. the reagent which is required for completion of the reaction
Question 21 Multiple Choice (Single Answer)

What is an amalgam?

  1. The mixture of a metal with Na
  2. An alloy
  3. The mixture of two metals
  4. The mixture of a metal with Hg
Question 22 Multiple Choice (Single Answer)

What is the number of moles of hydrogen in 3 moles of methane?

  1. 4
  2. 10
  3. 36
  4. 12
Question 23 Multiple Choice (Single Answer)

The S.I. unit of time is

  1. hour
  2. minute
  3. second
  4. microsecond
Question 24 Multiple Choice (Single Answer)

What is the number of moles of atoms in 32 grams of oxygen?

  1. 1 mole
  2. 2 mole
  3. 3 mole
  4. 16 mole
Question 25 Multiple Choice (Single Answer)

Pure gold is

  1. 22 carat
  2. 100 carat
  3. One carat
  4. 24 carat
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