If 30 mL of H₂ and 20 mL of O₂ reacts to form water. what is left at the end
If 30 mL of H₂ and 20 mL of O₂ reacts to form water. what is left at the end of the reaction?
Options
(a) 10 mL of H₂ (b) 5 mL of […]
Basic Concepts of Chemistry
The number of gram molecules of oxygen in 6.02 x 10²⁴ CO molecules is
The number of gram molecules of oxygen in 6.02 x 10²⁴ CO molecules is
Options
(a) 10 gm molecules (b) 5 gm molecules (c) 1 gm molecules (d) 0.5 gm molecules
Correct Answer: […]
The weight of iron which will be converted into its oxide(Fe₃O₄) by the action of 18g
The weight of iron which will be converted into its oxide(Fe₃O₄) by the action of 18 g of steam on it will be (at. wt. of Fe=56)
Options
(a) 168 g (b) 84 […]
10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded
10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be
Options
(a) 3 mol (b) 4 mol […]
Mass of one atom of X is 2.66 x 10⁻²³ g, then its 32 g is equal to
Mass of one atom of X is 2.66 x 10⁻²³ g, then its 32 g is equal to
Options
(a) 32 x 2.66 x 10⁻²³ mol (b) 32 / (2.66 x 10⁻²³ x […]
The number of significant figures for the three numbers 161 cm, 0.161 cm
The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are
Options
(a) 3,4,5 respectively (b) 3,4,4 respectively (c) 3,3,4 respectively (d) 3,3,3 respectively
Correct Answer:
3,3,3 respectively
Volume occupied by one molecule of water (density= 1 g cm⁻³) is
Volume occupied by one molecule of water (density= 1 g cm⁻³) is
Options
(a) 9 x 10⁻²³ cm³ (b) 6.023 x 10⁻²³ cm³ (c) 3 x 10⁻²³ cm³ (d) 5.5 x 10⁻²³ cm³
³⁵₁₇Cl and ³⁷₁₇Cl are two isotopes of chlorine. If average atomic weight is 35.5
³⁵₁₇Cl and ³⁷₁₇Cl are two isotopes of chlorine. If average atomic weight is 35.5 then ratio of these two isotopes is
Options
(a) 35 : 37 (b) 1 : 3 (c) 3 : […]
If Nₐ is Avagadro number then number of valence electrons in 4.2g of nitride
If Nₐ is Avagadro number then number of valence electrons in 4.2g of nitride ions (N³⁻) is
Options
(a) 2.4 Nₐ (b) 4.2 Nₐ (c) 1.6 Nₐ (d) 3.2 Nₐ
Correct Answer:
2.4 […]
2.76 g of silver carbonate on being strongly heated yield a residue weighing
2.76 g of silver carbonate on being strongly heated yield a residue weighing
Options
(a) 2.16 g (b) 2.48 g (c) 2.64 g (d) 2.32 g
Correct Answer:
2.16 g
Explanation:
No explanation […]