Question

10) Decomposition of calcium carbonate represented by the equation
d) 3
CaCO3 (s) = CaO (s) + CO2 (g)
In a closed vessel constitutes a system with number of phases equal to
a) 0
b) 1
c) 2
11) The precipitation should be carried in
a) Dilute solution b) Concentration solution c)Both a and b
d) None of these
12) In semi-micro qualitative analysis the quantity of the substance employed is
a) 0.1 to 0.5 gm
b) 0.05 gm c) 0.01 gm d) 1.00 gm
13) As solubility increases precipitation
a) Decreases b) Increases c) Unaffected d) None of these
14) The precipitation reagent should be prepared in----
a) Cold water b) Hot water c) ice cold water d) None of these
15) Stability of nucleus mainly depends on number of
a) Proton and electron b) Proton and neutron
b) Proton and neutron c) Neutron and electron
d) none of these
16) Hydrogen bomb is based on the principal of
a)Nuclear fusion b) Nuclear fission c) Radioactivity d) Nuclear fusion and fission
17) Which of the following is a radioactive element?
a) Sulphur b) Polonium c) Tellurium d) Selenium​

Answer 1

Answer:

10. CaCO3

11. both a and b

12. 0.01gm

13. increase

14. cold water

15. proton and electron

16. nuclear fusion

17. sulphur