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1009 available questions

Chemistry · Question 701

What is X in the reaction BeO + 2NaOH → X + H₂O?

  1. Na₂BeO₂
  2. NaBeO₂
  3. Na₂BeO₄
  4. Na₂Be₂O
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Correct answer: A

Na₂BeO₂

Amphoteric BeO reacts with strong base to form sodium beryllate, Na₂BeO₂, and water.

Chemistry · Question 702

Elements A, B, C and D have atomic numbers 7, 8, 9 and 12, respectively. Which has the smallest size and highest first ionization energy?

  1. A
  2. B
  3. C
  4. D
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Correct answer: C

C

C is fluorine (Z=9); across Period 2 it is smallest among A-C and has the highest first ionization energy of the four.

Chemistry · Question 703

What is the common oxidation state of alkaline-earth metals?

  1. +3
  2. +2
  3. +1
  4. +4
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Correct answer: B

+2

Group 2 atoms lose two valence electrons and normally form +2 ions.

Chemistry · Question 704

Which listed element has the greatest metallic character?

  1. Na
  2. Mg
  3. Al
  4. Si
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Correct answer: A

Na

Metallic character decreases from left to right across Period 3, so sodium is greatest.

Chemistry · Question 705

The Period 2 element with the highest melting point belongs to:

  1. Group 1
  2. Group 14
  3. Group 17
  4. Group 18
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Correct answer: B

Group 14

Carbon, a Group 14 element, forms a giant covalent lattice and has the highest melting point in Period 2.

Chemistry · Question 706

Within a period, the strongest oxidizing behaviour is generally shown by a:

  1. Group 1 metal
  2. Noble gas
  3. Halogen
  4. Chalcogen
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Correct answer: C

Halogen

Halogens strongly accept electrons and are powerful oxidizing agents.

Chemistry · Question 707

Which is not an alkali metal?

  1. Potassium
  2. Francium
  3. Sodium
  4. Strontium
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Correct answer: D

Strontium

Strontium belongs to Group 2, not Group 1.

Chemistry · Question 708

Which is the lightest alkali metal?

  1. Lithium
  2. Sodium
  3. Rubidium
  4. Potassium
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Correct answer: A

Lithium

Lithium has the lowest atomic mass among alkali metals.

Chemistry · Question 709

Which alkali metal is most abundant in Earth's crust among the choices?

  1. Potassium
  2. Rubidium
  3. Sodium
  4. Lithium
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Correct answer: C

Sodium

Sodium is the most abundant listed alkali metal in Earth's crust.

Chemistry · Question 710

Lithium shows a diagonal relationship with:

  1. Beryllium
  2. Sodium
  3. Magnesium
  4. Calcium
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Correct answer: C

Magnesium

Lithium and magnesium have similar charge density and show a well-known diagonal relationship.