1081. NaOH contains the following oxygen percentage:
A. 40 *
B. 60
C. 8
D. 10
1082. What quantity of limestone (CaCO3) on heating will give 56 kg of CaO?
A. 1000 kg
B. 56 kg
C. 44 kg
D. 100 kg *
1083. Which of the following has least mass?
A. 2 gram atom of nitrogen
B. The C atom is 3 * 10(23) *
C. 1 mole of S
D. 7.0 gr of Ag
1084. 1 mole CH4 contains:
A. 6.02 *10 (23) atoms of H
B. 4g-atom of Hydrogen *
C. 1.81*10(23) molecules of CH4
d. 3 gram of Carbon
1085. How many moles of Helium gas occupy 22.4 L AT 0 degree centigrade at1 atm.pressure ?
A. 0.11
B. 0.90
C. 1.0 *
D. 1.11
1086. 2 gram of oxygen contains number of molecules equivalent to that in :
A. 0.5 g of hydrogen
B. 4 g of sulphur *
C. 7 g of nitrogen
D. 2.3 g of sodium
1087. The number of valence electrons in 4.2 g of nitride ions is as follows if NA IS A vogadro’s number:
A. 2.4 NA *
B. 4.2 NA
C. 1.6 NA
D. 3.2 NA
1088. The maximum amount of BaSO4 precipitatd on mixing BacCI2 (0.5 M) with H2SO4 (1M) will correspond to :
A. 0.5 M *
B. 1.0 M
C. 1.5 M
D. 2.0 M
1089. The largest no of molecules is in :
A. 34 gram of water *
B. 28 gram of CO2
C. 46 gram of CH3OH
D. 54 gram of N2O5
1090. 9.85 grams of Baco3 (AT Mass BA=137) will release 9.85 grams of CO2 at STP on heating, assuming complete decomposition.
A. 0.84 L
B. 0.24 L
C. 4.06 L
D. 1.12 L *