Sodium bicarbonate on heating decomposes to form sodium carbonate, CO2 and water. If 0.2 moles of sodium bicarbonate is completely decomposed, how many moles of sodium carbonate is formed?
1. 0.1
2. 0.2
3. 0.05
4. 0.025
A purified pepsin was subjected to amino acid analysis. The amino acid present in the smallest amount was lysine, C6H14N2O2 and the amount of lysine was found to be 0.431g per 100 g of protein. The minimum molecular mass of protein is:
1. 34 u
2. 3400 u
3. 34,000 u
4. 3,400,000 u
The number of valence electrons present in 0.53 grams of Na2CO3 is:
1.
2.
3.
4.
At STP, the density of CCl4 vapour in g/L will be closest to:
1. 8.67
2. 6.87
3. 3.67
4. 4.26
If molecules are removed from 98 mg of H2SO4, then the number of moles of H2SO4 left are -
1.
2.
3.
4.
A chloride of a metal (M) has 65.5% of chlorine. 100 ml of vapour of the chloride of metal at STP weighs 0.72 g. The molecular formula of this metal chloride is
1. MCl3
2. MCl4
3. M2Cl3
4. MCl5
The molality of 0.01 M Na2CO3 solution is:
(The density of the solution is 1.1 g/ml)
1.
2.
3.
4.
The weight of 1x1023 molecules of CuSO4.5H2O is:
1. 34.42 g
2. 41.42 g
3. 54.44 g
4. 68.94 g
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 |
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 |