Class 10 study materials part 4

April 26, 2020NoticeComments Off on Class 10 study materials part 4

solve

1)If- 5 is a root of the quadratic equation 2x2 + px -15 = 0 and the quadratic equation p(x2 + x) + k = 0 has equal roots, find the value of k.

2)Solve for x: $\sqrt { 2x+9 }$ + x = 13.

3) A two digit number is four times the sum of the digits. It is also equal to 3 times the product of digits. Find the number.

4) the roots of the quadratic equation (a – b)x2 + (b – c)x + (c – a) = 0 are equal, prove that 2a = b + c

1)A compound X is formed by the reaction of a carboxylic acid C2H4O2 and an alcohol in presence of a few drops of H2SO4. The alcohol on oxidation with alkaline KMnO4 followed by acidification gives the same carboxylic acid as used in this reaction. Give the names and structures of (a) carboxylic acid, (b) alcohol and (c) the compound X. Also write the reaction.

2)Why detergents are better cleansing agents than soaps? Explain.

3)How is ethene prepared from ethanol? Give the reaction involved in it.

4)Intake of small quantity of methanol can be lethal. Comment.

5)A gas is evolved when ethanol reacts with sodium. Name the gas evolved and also write the balanced chemical equation of the reaction involved.

6)Ethene is formed when ethanol at 443 K is heated with excess of concentrated sulphuric acid. What is the role of sulphuric acid in this reaction? Write the balanced chemical equation of this reaction.

7)Name the functional groups present in the following compounds

• (a) CH3 CO CH2 CH2CH2CH3
• (b) CH3CH2CH2COOH
• (c) CH3CH2CH2CH2CHO
• (d) CH3CH2OH