1. The atom having the biggest atomic size from period 2.
Ans: Lithium (Li)
2. The atom having the smallest atomic radius from zero group.
Ans: Helium (He)
3. The family of group 1 elements.
Ans: Alkali metals
4. Highest reactive nonmetal.
Ans: Fluorine (F)
5. The element having stable electron configuration from the third period.
Ans: Argon (Ar)
6. A halogen from period 4.
Ans: Bromine (Br)
7. The family of elements having zero valency.
Ans: Noble gases/Inert gases
8. Two elements having two orbits
Ans: Carbon (C), oxygen (O)
9. Highest electronegative element
Ans: Fluorine (F)
10. Highest electropositive element
Ans: Francium (Fr)
11. The atom having smallest atomic radius from group 1.
Ans: Hydrogen (H)
12. The group of elements having electronic configuration 2, 2.
Ans: Group 2
13. Products obtained when sugar is heated.
Ans: Carbon and water vapour
14. The phase in which solid substances are converted into liquid.
Ans: Melting
15. The amount of heat absorbed at constant temperature by unit mass of a liquid to convert into gaseous phase.
Ans: Specific latent heat of vaporisation
16. Conversion of ice into liquid due to applied pressure and the reconverts to ice once the pressure is removed.
Ans: Regelation
17. The instrument used to study anomalous behaviour of water
Ans: Hope’s apparatus
18. The instrument used to measure the specific heat capacity of a substance using mixture method.
Ans: Calorimeter
19. The distance between focus and optical centre
Ans: Focal length
20. The part of human eye that transmits electrical signals to the brain
Ans: Optic nerve
21. The lens used in simple microscope
Ans: Convex
22. The ability of lens to adjust the focal length as per need is
Ans: Power of accommodation
23. The defect of eye occurring due to ageing.
Ans: Presbyopia
24. The fleshy screen behind cornea
Ans: Iris
25. The screen with light sensitive cells in human eye.
Ans: Retina
26. The sensation on the retina persists for a while is
Ans: Persistence of vision
27. The persons which are unable to distinguish between different colours
Ans: Colour blind
28. The imaginary line passing through two optical centres of lens
Ans: Principal axis
29. The molecular formula of main ore of aluminium –
Ans: Al2O3.nH2O
30. The device used for grinding an ore
Ans: Ball mill
31. Nonmetal which is a good conductors of electricity.
Ans: Graphite
32. The reagent which dissolves noble metals.
Ans: Aqua regia
33. Metals which are amphoteric in nature –
Ans: Aluminium (Al), zinc (Zn)
34. An alloy of copper and tin –
Ans: Bronze
35. Two highly reactive metals –
Ans: Lithium (Li), sodium (Na)
36. The process of strong heating of carbonate ores in insufficient air –
Ans: Calcination
37. The process of extraction of aluminium from alumina-
Ans: Electrolytic reduction
38. Method used to prevent corrosion of copper –
Ans: Anodization and/or tinning