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Elements and Compounds

Elements and Compounds

20 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Consider the following and choose which among them cannot be split into simpler substances by a chemical means?
i. Chlorine
ii. Water
iii. Oxygen
iv. Silica
v. Sand
vi. Hydrogen
vii. Sodium
viii. Zinc

  1. i, ii, iii, vi, viii
  2. i, iii, vi, vii, viii
  3. i, ii, v, vii
  4. ii, iv, v
Question 2 Multiple Choice (Single Answer)

What are the substances that can be split into two or more simpler substances by a chemical means called?

  1. Mixtures
  2. Compounds
  3. Elements
  4. Atoms
Question 3 Multiple Choice (Single Answer)

Which among the following are considered as compounds?
I. Red copper turnings
II. Blue crystals of copper sulphate
III. Greyish iron nails
IV. Green crystals of ferrous sulphate

  1. I and II
  2. III and IV
  3. I and III
  4. II and IV
Question 4 Multiple Choice (Single Answer)

Consider the following statements and choose which among them are the characteristics of an atom:
I. The atoms of an element are all alike but different from those of others.
II. The atoms of an element show all the properties of the element.
III. One kind of atom can be changed into another.

  1. I and II
  2. I and III
  3. II and III
  4. I, II and III
Question 5 Multiple Choice (Single Answer)

Which of the following elements have atomocity 8 and are called octatomic?

  1. Ozone
  2. Xenon
  3. Sulphur
  4. Krypton
Question 6 Multiple Choice (Single Answer)

Which among the following correctly defines the term atomicity?

  1. Number of atoms present in a molecule of an element.
  2. Number of protons present in an atom of molecule.
  3. Number of atoms present in a compound.
  4. Number of electrons present in an atom of an element.
Question 7 Multiple Choice (Single Answer)

Which among the following are called the molecules?
I. H2
II. NaCl
III. Cl
IV. O3
V. S8
VI. Na2O
VII. N

  1. I, III, V
  2. I, IV, V
  3. II and VI
  4. III and VII
  5. I, II and III
Question 8 Multiple Choice (Single Answer)

Identify the formula of the compound if valency of magnesium is 2 and that of chlorine is 1.

  1. Mg2Cl
  2. MgCl2
  3. 2MgCl
  4. Mg2Cl
Question 9 Multiple Choice (Single Answer)

Match the following and choose the correct options given below
1. Air i. Element
2. Magnesium oxide ii. Mixture
3. Platinum iii. Compound
4. Aluminium
  1. 1-(i), 2 and 4-(ii), 3-(iii)
  2. 1 and 4-(ii), 2-(iii), 3 and 4-(i)
  3. 1-(iii), 2-(i), 3 and 4-(ii)
  4. 1-(i), 2 and 4-(iii), 3-(ii)
Question 10 Multiple Choice (Single Answer)

Match the following elements with their valencies and choose the correct options given below
1.Bromine i. Tetravalent
2. Sulphur ii. Trivalent
3.Nitrogen iii. Monovalent
4. Carbon iv. Divalent
  1. 1-(i), 2-(ii), 3- (iii), 4- (iv)
  2. 1-(ii), 2- (i), 3- (iv), 4-(iii)
  3. 1- (iii), 2-(iv), 3-(ii), 4-(i)
  4. 1-(iv), 2-(iii), 3-(ii),4-(i)
Question 11 Multiple Choice (Single Answer)

How many electrons are there in an element if its atomic number is 7 and number of protons are 7?

  1. 14
  2. 7
  3. 0
  4. 49
Question 12 Multiple Choice (Single Answer)

What are the elements like zinc and magnesium having valency 2 called?

  1. Monovalent
  2. Tetravalent
  3. Trivalent
  4. Bivalent
Question 13 Multiple Choice (Single Answer)

What is the valency of phosphorous in PCl5?

  1. 1
  2. 2
  3. 0
  4. 5
Question 14 Multiple Choice (Single Answer)

Match the following elements with their symbols and choose the correct options given below
1. Carbon i. Cu
2. Calcium ii. K
3. Potassium iii. Ca
4. Copper iv. C
  1. 1-(i), 2-(ii), 3-(iii), 4-(iv)
  2. 1-(ii), 2-(i), 3-(iv), 4-(iii)
  3. 1-(iii), 2-(iv), 3-(i), 4-(ii)
  4. 1-(iv), 2-(iii), 3-(ii),4-(i)
Question 15 Multiple Choice (Single Answer)

What will be the number of neutrons in an atom if it contains 12 protons and have atomic mass 25?

  1. 12
  2. 13
  3. 37
  4. 14
Question 16 Multiple Choice (Single Answer)

Match the following elements with their atomic number and choose the correct options given below
1.Hydrogen i. 17
2. Carbon ii. 7
3. Nitrogen iii. 6
4. Chlorine iv.1
  1. 1-(i), 2-(ii), 3- (iii), 4- (iv)
  2. 1-(ii), 2- (i), 3- (iv), 4-(iii)
  3. 1- (iii), 2-(iv), 3-(ii), 4-(i)
  4. 1-(iv), 2-(iii), 3-(ii),4-(i)
Question 17 Multiple Choice (Single Answer)

Match the following and choose the correct options given below
1. Copper(I) chloride i. CuCl
2. Copper(II) chloride ii. CuCl2
3. Iron(II) chloride iii. FeO
4. Iron(III) chloride iv. Fe2O3
  1. 1-(i), 2-(ii), 3- (iii), 4- (iv)
  2. 1-(ii), 2- (i), 3- (iv), 4-(iii)
  3. 1- (iii), 2-(iv), 3-(ii), 4-(i)
  4. 1-(iv), 2-(iii), 3-(ii),4-(i)
Question 18 Multiple Choice (Single Answer)

What will be the atomic mass of an element if it has 9 protons and 10 neutrons in the nucleus of its shell?

  1. 9
  2. 10
  3. 19
  4. 1
Question 19 Multiple Choice (Single Answer)

What is the valency of an element if its atomic number is 8?

  1. 1
  2. 2
  3. 3
  4. 4
Question 20 Multiple Choice (Single Answer)

Match the following elements with their Latin names and choose the correct options given below
1. Sodium i. Ferrum
2. Iron ii. Natrium
3. Silver iii. Plumbum
4. Lead iv. Argentum
  1. 1-(i), 2-(ii), 3- (iii), 4- (iv)
  2. 1-(ii), 2- (i), 3- (iv), 4-(iii)
  3. 1- (iii), 2-(iv), 3-(i), 4-(ii)
  4. 1-(iv), 2-(iii), 3-(ii), 4-(i)
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