Tag: Chemistry

Previous paper class 9th(Chemistry)

Q No. 2: Short Questions. /301) Why does ice floats on water?2) Differentiate between lone pair and bond pair of electrons.3) Why HCl has dipole-dipole forces of attraction?4) Why does a covalent bond become polar?5) What is octet rule?6) What is Lewis structure of diagram?7) What is meant by malleable and ductile property of metals?8)… Continue reading Previous paper class 9th(Chemistry)

Previous paper class 10th(Chemistry)

Q NO. 1: Choose the right answer. /131) Petroleum is refined by:a) Simple distillation b) Fractional distillationb) Destructive distillation d) Dry distillation2) Main component of natural gas is:a) Methane b) Ethane c) Propane d) Propene3) Pitch is black residue of:a) Coke b) Coal c) Coal tar d) Coal gas4) Vital Force Theory was given by:a)… Continue reading Previous paper class 10th(Chemistry)

Previous paper class 1st Year(Chemistry)

Q NO.1: Choose the right answer /22 The Qualitative analysis is concerned with:(a) Detection of element (b) Identification of element(c) Amount of element (d) Both a and b2) Which kind of filter is useful for solutions that react with paper:(a) Fluted filter paper (b) Folded filter paper(c) Gooch crucible (d) Sintered glass crucible3) The solvent… Continue reading Previous paper class 1st Year(Chemistry)

Previous paper class 2nd Year(Chemistry)

Q NO. 1: Choose the right answer. /221) Catalytic oxidation occurs in:(a) Lower Alkanes (b) Higher Alkanes(c) Lower Alkenes (d) Alkynes2) Highly reactive Halogen in the process of Halogenation is:(a) Chlorine (b) Bromine (c) Fluorine (d) Iodine3) A trans Alkane is obtained by treating alkyne with:(a) K/liq.NH3 (b) Na/liq.NH3 (c) Pd (BaSO4) (d) H2O4) Which… Continue reading Previous paper class 2nd Year(Chemistry)

Previous paper class 9th(Chemistry)

Q: no: 2: Short answer questions. /12*2=241) Write two difference between Ions and Free Radicals.2) Define empirical formula with an example.3) Define atomic mass unit. Why is it needed?4) Why is an iron grill painted frequently?5) What is the nature of electrode used in electrolyzing of chromium?6) Where do the electrons flow from Zn electrode… Continue reading Previous paper class 9th(Chemistry)