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1. The number of anti bonding electron pair in O2²- ion on basis on MO theory
Ans: 4

2. A 25ml solution of barium hydroxide on titration with 0.1molar solution of HCL gave a titre value of 35ml. Then find molarity of barium hydroxide.


3. Which device is used to measure relative molecular mass?
Ans. Mass spectrometer

4. Which of the following is primary amine?

5. 1mole of CH4 contains:
Ans: 4gm of hydrogen

6. Which of these compounds is polar and central atom sp² hybridization.
Ans: BF3

7. The number of possible enantiomeric pairs that can be produced during mono chlorination of 2 methyl butane


8. The pollution of SO2 in air is 10ppm by volume,then volume of SO2 per litre is;
Ans: 10-⁵

9. 50gm of CaCo3 was burnt in air. What is the weight of residue:
Ans: 28

10. Insulin hormone chemically is:
Protein

11. which of the following has lowest dipole:
Ans: H3C-C---C-CH3

12. When a source emitting lines is placed in strong magnetic field the spectral line are split into components known as:
Ans: zeeman effect



13. Mole is related to:



14. Vapour density of ozone is:
Ans: 24



15. BOTH methane and ethane can be prepared in one step reaction by:



16. In the preparation of alkene from alcohol using Al2O3 the most important factor is:
Ans: temperature



17. Which of the following has highest bond energy



18. A graph plotted by boyle's law is:
Ans: hyperbolic




19. Propyne + mercuric sulphate gives 'A' + mercurous sulphate,then A is:




20. The number of hydroxyl group in phosphoric acid is:
Ans: 4




21. The number of significant figures in 306.45 and 40440 are
Ans: 5,4 respectively


22. When a primary amine react with chloroform in in ethanolic kOH, what is formed







23. When electron drops from higher energy to lower energy then it
Ans: release energy

24. What would be the the volume of acetone required to prepare 10% volume by volume acetone solution in 5 litre solution






25. Equivalent weight of acid is






26. A radio isotope will EMIT which rays



27: what is the what is the main composite of natural gas
Ans : methane


28. Which block of periodic table is less electropositi I'm