1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Sulphuric acid used in Lead Storage battery has a concentration of $$4.5 \mathrm{~M}$$ and a density of $$1.28 \mathrm{~g} / \mathrm{~ml}$$. The molality of the acid is __________.

A
4.012
B
2.568
C
5.364
D
3.516
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A given mass of a hydrocarbon on complete combustion produced $$176 \mathrm{~g}$$ of $$\mathrm{CO}_2$$ and $$90 \mathrm{~g}$$ of $$\mathrm{H}_2 \mathrm{O}$$. What is the Molecular formula of the compound?

A
$$\mathrm{C}_3 \mathrm{H}_8$$
B
$$\mathrm{C}_6 \mathrm{H}_{12}$$
C
$$\mathrm{C}_4 \mathrm{H}_{10}$$
D
$$\mathrm{C}_5 \mathrm{H}_{12}$$
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$15 \mathrm{~g}$$ of $$\mathrm{CaCO}_3$$ completely reacts with

A
$$6.95 \mathrm{~g}$$ of $$\mathrm{HCl}$$
B
10.95 g of $$\mathrm{HCl}$$
C
$$11.95 \mathrm{~g}$$ of $$\mathrm{HCl}$$
D
$$1.15 \mathrm{~g}$$ of $$\mathrm{HCl}$$
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

$$\mathrm{Mg}(\mathrm{OH})_2$$ is used as an antacid. If a person, suffering from acidity, produces $$2.5 \mathrm{~L}$$ of Gastric juice in a day, approximately how many antacid tablets, each containing $$600 \mathrm{~mg}$$ of $$\mathrm{Mg}(\mathrm{OH})_2$$, will be required to completely neutralise the whole $$\mathrm{HCl}$$ produced in the stomach in one day? (Gastric juice contains $$3.0 \mathrm{~g}$$ of $$\mathrm{HCl}$$ per L). (Atomic masses: $$\mathrm{Mg}=24 \mathrm{~g} / \mathrm{mol}, \mathrm{O}=16 \mathrm{~g} / \mathrm{mol}$$ & $$\mathrm{H}=1 \mathrm{~g} / \mathrm{mol}$$.)

A
10 tablets
B
4 tablets
C
7 tablets
D
6 tablets
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