When 50cm3 of 0.2N H2SO4 is mixed with 50 cm3 of 1N KOH, the heat liberated is
11.46 kJ
57.3 kJ
573 kJ
573 J
An artificial radioactive isotope gave N after two successive β-particle emissions. The number of neutrons in the parent nucleus must be
9
14
5
7
A.
9
Atomic number increases by one after the emission of one β-particles. Hence, the parent nucleus ( which on two successive β-emission gave 7N14) must be 5X14. Hence, number of neturons in parents nucleus= 14-5 = 9.
A solution contains 1.2046 x 1024 hydrochloric acid molecules in one dm3 of the solution. The strength of the solution is
6N
2N
4N
8N
The pressure and temperature of 4 dm3 of carbon dioxide gas are doubled. Then the volume of carbon dioxide gas would be
2 dm3
3 dm3
4 dm3
8 dm3
4g of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave 5 g of its oxide. The equivalent weight of copper is
23
32
12
20
The chemical equilibrium of a reversible reaction is not influenced by
pressure
catalyst
concentration of the reaction
temperature
56g of nitrogen and 8g of hydrogen gas are heated in a closed vessel. At equilibrium 34 g of ammonia are present. The equilibrium number of moles of nitrogen,hydrogen and ammonia respectively are
1,2,2
2,2,1
1,1,2
2,1,2