Q. No.
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
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The mass of ammonia produced when 2.00 × 103 g dinitrogen reacts with 1.00 ×103 g of dihydrogen is:
| 1. | 2338.11 g
|
2. | 2428.57 g
|
| 3. | 2712.24 g
|
4. | 2180.56 g |
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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
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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 |
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ln the final answer of the expression \(\large{\frac{(29.2-20.2)\times(1.79\times10^5)}{1.37}}\)
the number of significant figures after solving the expression is:
| 1. | 2 | 2. | 4 |
| 3. | 6 | 4. | 7 |
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lf NA is Avogadro's number, then the number of valence electrons in 4.2 g of nitride ions (N) will be:
| 1. | 3.2 NA | 2. | 1.6 NA |
| 3. | 2.4 NA | 4. | 1.2 NA |
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1cc N2O at STP contains:
| 1. | \({1.32 \over 224} \times10^{23}~\text{electrons}\) | 2. | \({6.02 \over 22400} \times10^{23}~\text{molecules}\) |
| 3. | \({1.8 \over 224} \times10^{22}~\text{atoms}\) | 4. | All of the above |
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