Hydrogen [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Chemistry]: Questions 20 - 25 of 86
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Question 20
Question MCQ▾
20 ml of a sample of H2O2 gives 400 ml of oxygen measured at NTP. The sample should be labeled as:
Choices
Choice (4) | Response | |
---|---|---|
a. | Anhydrous H2O2 | |
b. | Dil. H2O2 | |
c. | 20 vol. H2O2 | |
d. | 5 vol. H2O2 |
Question 21
Question MCQ▾
Hard water is not suitable for washing clothes because?
Choices
Choice (4) | Response | |
---|---|---|
a. | It contains impurities | |
b. | It gives insoluble precipitates | |
c. | It is acidic in nature | |
d. | It contains Na2SO4 and KCl |
Question 22
Question MCQ▾
2 g of aluminum is treated separately with excess of dilute sulphuric acid and excess of NaOH. The ratio of volumes of hydrogen evolved under similar conditions of pressure and temperature is?
Choices
Choice (4) | Response | |
---|---|---|
a. | 1: 3 | |
b. | 1: 1 | |
c. | 2: 1 | |
d. | 3: 1 |
Question 23
Question MCQ▾
Water can extinguish most fires but not petrol fire, because?
Choices
Choice (4) | Response | |
---|---|---|
a. | water is lighter than petrol | |
b. | Hydrogen bonding | |
c. | petrol is lighter than water | |
d. | Question does not provide sufficient data or is vague |
Question 24
Question MCQ▾
In alkaline medium, H2O2 reacts with Fe+ 3 and Mn+ 2 separately to give?
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 25
Question MCQ▾
The temporary hardness of water due to calcium bicarbonate can be removed by adding?
Choices
Choice (4) | Response | |
---|---|---|
a. | Calcium carbonate | |
b. | Calcium chloride | |
c. | Calcium hydroxide | |
d. | Hydrochloric acid |