CLASS - X
SUBJECT - CHEMISTRY
1. Give any five points of differences between Covalent compounds and Ionic compounds.
2. Give the structural and condensed formula for the following organic compounds.
a. propane
b. cycloheptane
c. pentanoicacid
d. hexanol
3. Generate the homlogous series for compounds containing upto 10 carbon atoms for alcohol homologous series.
4. Give the structure of the following compounds.
a. pent-2-ene b. 3-Methylbotane
c. 2,3,3-Trimethylpentane
d. But-2-yne
e. 3-Methylbutan-2-one
5. What is means byu Isomerism? Give the strucutural isomers of pentane.
6. Give the following chemical reactions with equations.
a. Ethanol with sodium
b. Ethanoic acid with ethanol
c. hychonetaion of ursaturated compounds
d. Ethanoic acid with sodium bicarnoate
7. Explain the formation of scum when hard water is heated with soap?
8. Explain the cleansing action of soap.
9. Why does micelle formation take place when soap is added to water? Will a micelle be formed when ethanol is used
as solvent?
10. Give test to distinguish between the following : a. Ethanol and Ethanoic acid
b. Butter and cooking oil.
CLASS - IX
SUBJECT - CHEMISTRY
1. State the law of conservation of mass and law of constant proportion.
2. Define the following terms :
a. atomic mass unit
b. chemical formula
c. formula unit mass
3. Give the formula for the following :
a. Aluminium sulphate
b. Calcium chloride
c. Potassium sulphate
d. Hydrogen sulphide
e. Sodium oxide
f. Magnesium hydroxide
g. ammonium sulphate
H. Sodium hydrogencarbonate i. Coppernitride
j. Silver bromide
4. Give the names of the compounds represented by the following chemical formulae.
a. NH4OH
b. NaI
c. MgCo3
d. CuSo4
e. AIN
f. Ca3(P04)2
g. CaBr2
h. ZnSo3
i. Fe2(So4)3
j. Fecl2
5. Calculate the following : a. No. of moles in 7.85 g of Iron (at mass 56).
b. Mass of 1.5 gram molecule of water.
c. No. of atoms in 2 mole molecules of N2.
d. No. of molecules in 3.4 g of H2S.
e. Molar mass of a substance, 6.02x1020 molecules of which weigh 44 mg.
f. Which has more atoms 1.0 g of H2 or 1.0 g of carbon.
g. Molar mass of CH4 and Na2Co3.
h. No. of moles in 44 g of Co2 and 40 g of NaoH.
6. Give the main postulates of Dalton's atomic theory.