Assertion : Crystals of hydrated calcium sulphate gypsum : CaSO4, 2H2O are soft and easily cleaved.

Reason : Crystals of anhydrous calcium sulphate anhydrite : CaSO4 are very hard and very difficult

               to cleave.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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When two atoms combine to form a molecule

1. Energy is released

2. Energy is absorbed

3. Energy is neither released not absorbed

4. Energy may either released or absorbed

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Compound having highest Melting Point :

1. BeCl2

2. MgCl2

3. CaCl2

4. SrCl2

Concept Questions :-

Acid, Base and Fajan's Rule
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The diamagnetic species among the following is-

1. NO

2. CO

3. O2

4. B2

Concept Questions :-

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Which of the statements are not true for AlCl3-

1. AlCl3 fumes in moist air forms HCl with moisture

2. Anhydrous AlCl3 exists as Al2Cl6

3. Anhydrous AlCl3 is ionic

4. Anhydrous AlCl3 is trigonal planar molecule at higher temperature

Concept Questions :-

Covalent Bonding
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Valency expresses-

1. Total electrons in an atom

2. Atomicity of an element

3. Oxidation number of an element

4. Combining capacity of an element

Concept Questions :-

Types of Bonding
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Which of the following has maximum bond strength-

1. O2

2. O2+

3. O2-

4. O22-

Concept Questions :-

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Out of following which has maximum value of lattice energy

1. NaF

2. NaCl

3. NaBr

4. NaI

Concept Questions :-

Acid, Base and Fajan's Rule
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Compound with maximum ionic character is formed from-

1. Na and Cl

2. Cs and F

3. Cs and I

4. Na and F

Concept Questions :-

Ionic Bonding
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The crystal lattice of electrovalent compound is composed of :

1. Atoms

2. Molecules

3. Oppositely charged ions

4. Both molecules and ions

Concept Questions :-

Ionic Bonding
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