ln, a closed vessel, 50 ml of completely reacts with 200 ml of C2 according to the following equation:
The composition of the gaseous mixture in the system will be:
1. 100 ml
2. 25 ml
3. 75 ml
4. 10 ml
On complete combustion, 44 g of a sample of a compound gives 88 g CO2 and 36 g of H2O. The molecular formula of the compound may be:
1.
2.
3.
4.
The maximum number of molecules is present in which of the following?
1. 15 L of gas at STP
2. 5 L of gas at STP
3. 0.5 g of gas
4. 10 g of gas
The number of moles present in 2.5 litres of 0.2 M are:
1. 0.25
2. 0.5
3. 0.75
4. 0.2
The number of valence electrons present in 0.53 grams of Na2CO3 is:
1.
2.
3.
4.
The amount of Zinc (atomic weight = 65) necessary to produce 224 mL of H2 (at STP) by the reaction with dilute sulphuric acid will be:
1. | 0.65 g | 2. | 7.6 g |
3. | 6.5 g | 4. | 8.5 g |
On complete decomposition, the volume of CO2 released at STP on heating 9.85 g of BaCO3 (atomic mass, Ba = 137) will be:
1. 1.12 L
2. 4.84 L
3. 2.12 L
4. 2.06 L
If 4 g of NaOH dissolves in 36 g of H2O, the molarity of the solution is: (specific gravity of solution is 1 g mL-1) :
1. | 3 M | 2. | 3.5 M |
3. | 2.5 M | 4. | 2 M |
The density of a 2 M aqueous solution of NaOH is 1.28 g/. The molality of the solution is:
[molecular mass of NaOH = 40 ]
1. | 1.20 m | 2. | 1.56 m |
3. | 1.67 m | 4. | 1.32 m |
Two students performed the same experiment separately, and each of them recorded two readings of mass, which are given below. The correct reading of mass is 3.0 g. On the basis of the given data, mark the correct option out of the following statements.
Students | Readings | |
(i) | (ii) | |
A | 3.01 | 2.99 |
B | 3.05 | 2.95 |
1. | The results of both the students' are neither accurate nor precise. |
2. | The results of student A are both precise and accurate. |
3. | Student B's results are neither precise nor accurate. |
4. | The results of student B are both precise and accurate. |