The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are
3,4 and 5 respectively
3,4 and 4 respectively
3,3 and 4 respectively
3,3 and 3 respectively
0.24 g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance?(Density of H2 = 0.089)
95.93
59.93
95.39
5.993
Matter is made up of extremely small discrete particles called
Atoms
Molecules
Elements
Ions
Percentage of Se in peroxidase anhydrase enzyme is 0.5% by weight (atomic weight = 78.4), then minimum molecular weight of peroxidase anhydrase enzyme is
15.68
At STP, the density of CCI4 vapour in g/L will be nearest to
6.87
3.42
10.26
4.57
Liquid benzene (C6H6) burns in oxygen according to the equationHow many litres of O2 at STP are needed to complete the combustion of 39 g of liquid benzene ?(Mol wt O2 = 32, C6H6 = 78)
74 L
11.2 L
22.4 L
84 L
The maximum number of molecules are present in
15 L of H2 gas at STP
5 L of N2 gas at STP
0.5 g of H2 gas
10 g of O2 gas
The number of moles of oxygen in 1 L of air containing 21 % oxygen by volume, under standard conditions, is
0.0093 mole
2.10 moles
0.186 mole
0.21 mole
1 cc N2 O at NTP contains
All of the above
