General
✓✗1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24, O = 16)
- Mg, 0.16 g
- O2, 0.16 g
- Mg, 0.44 g
- O2, 0.28 g
General
✓✗An element, X has the following isotopic composition:
200X : 90% 199X : 8.0% 202X : 2.0%
The weighted average atomic mass of the naturally occurring element X is closest to
200X : 90% 199X : 8.0% 202X : 2.0%
The weighted average atomic mass of the naturally occurring element X is closest to
- 201 amu
- 202 amu
- 199 amu
- 200 amu
General
✓✗Which has maximum molecules?
- 7 g N2
- 2 g H2
- 16 g NO2
- 16 g O2
General
✓✗At S.T.P. the density of CCl4 vapour in g/L will be nearest to
- 6.87
- 3.42
- 10.26
- 4.57
General
✓✗Which has the maximum number of molecules among the following?
- 44 g CO2
- 48 g O3
- 8 g H2
- 64 g SO2
General
✓✗What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed with 50 mL of 5.8% NaCl solution? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5)
- 3.5 g
- 7 g
- 14 g
- 28 g
General
✓✗The number of atoms in 4.25 g of NH3 is approximately
- 4 ´ 1023
- 2 ´ 1023
- 1 ´ 1023
- 6 ´ 1023
General
✓✗Volume of CO2 obtained by the complete decomposition of 9.85 g of BaCO3 is
- 2.24 L
- 1.12 L
- 0.84 L
- 0.56 L
General
✓✗Molarity of liquid HCl, if density of solution is 1.17 g/cc is
- 36.5
- 18.25
- 32.05
- 42.10
General
✓✗The maximum number of molecules is 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
General
✓✗The number of water molecules is maximum in
- 1.8 gram of water
- 18 gram of water
- 18 moles of water
- 18 molecules of water.
General
✓✗A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with cone. H2SO4. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be
- 1.4
- 3.0
- 2.8
- 4.4
General
✓✗1 cc N2O at NTP contains
-
atoms
-
molecules
-
electrons
- all of the above
General
✓✗The molecular weight of O2 and SO2 are 32 and 64 respectively. At 15°C and 150 mmHg pressure, one litre of O2 contains 'N' molecules. The number of molecules in two litres of SO2 under the same conditions of temperature and pressure will be
- N/2
- N
- 2 N
- 4 N
General
✓✗Oxidation numbers of A, B, C are +2, +5 and –2 respectively. Possible formula of compound is
- A2(BC2)2
- A3(BC4)2
- A2(BC3)2
- A3(B2C)2