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Chemistry
What is the chemical formula of ammonia?
A
NH?
B
NO?
C
N?H
D
NH?
Correct Answer
A
Chemistry
Which element has the atomic number 6?
A
Nitrogen
B
Carbon
C
Oxygen
D
Boron
Correct Answer
B
Chemistry
Which of the following is an alkali metal?
A
Sodium
B
Calcium
C
Aluminum
D
ron
Correct Answer
A
Chemistry
Which element is essential for the formation of hemoglobin?
A
Calcium
B
Iron
C
Sodium
D
Sodium
Correct Answer
B
Chemistry
Which gas is known as laughing gas?
A
Nitrogen
B
Nitrous oxide
C
Carbon monoxide
D
Sulfur dioxide
Correct Answer
B
Chemistry
What is Avogadro's number approximately equal to?
A
6.022 ร 10ยฒยณ
B
3.011 ร 10ยฒยณ
C
9.8 ร 10ยฒยณ
D
1.602 ร 10ยน?
Correct Answer
A
Chemistry
What is the SI unit of amount of substance?
A
Gram
B
Mole
C
Liter
D
Kilogram
Correct Answer
B
Chemistry
Which type of bond is formed by the transfer of electrons?
A
Covalent bond
B
Ionic bond
C
Metallic bond
D
Hydrogen bond
Correct Answer
B
Chemistry
Which type of bond involves the sharing of electrons?
A
Ionic bond
B
Covalent bond
C
Metallic bond
D
Hydrogen bond
Correct Answer
B
Chemistry
Which substance is commonly known as baking soda?
A
Sodium carbonate
B
Sodium bicarbonate
C
Calcium carbonate
D
Potassium chloride
Correct Answer
B