English Medium इयत्ता १० - CBSE Question Bank Solutions for Science

How does the light have to enter the glass: 

 to produce a large amount of bending?

How does the light have to enter the glass: 

 for no refraction to happen? 

Fill in the following blank with suitable word:

 Ethene and ethyne are examples of ..... hydrocarbons.

 Fill in the following blank with suitable word:

Carbon compounds have usually ... melting points and boiling points because they are ...... in nature.

What is the difference between two consecutive homologues:
(1) in terms of molecular mass?
(2) in terms of number and kind of atoms per molecule?

Give the molecular formula of one homologue of the following:

C₃H₆

Give the molecular formula of one homologue of each of the following:

C₂H₆

Write the names and formulae for the first three members of the homologous series for chloroalkanes.

Define a homologous series. Give the name and structural formula of one homologue of the following:
CH₃OH

Write the molecular formula of the third member of the homologous series of carbon compounds with general formula C_nHO_2n+1OH.

What is a homologous series? Explain with an example.

The molecular formula of an organic compound is C₁₈H₃₆. Name its homologous series.

The molecular formula of a homologue of butane is:
(a) C₄H₈
(b) C₃H₆
(c) C₄H₆
(d) C₃H₈

The number of carbon atoms present in the molecule of fifth member of the homologous series of alkynes is:

(a) four
(b) five
(c) six
(d) seven

The molecular formula of the third member of the homologous series of ketones is:
(a) C₄H₈O
(b) C₃H₆O
(c) C₅H₁₀O
(d) C₆H₁₂O

An organic compound having the molecular formula C₃H₆O can exist in the form of two isomers A and B having different functional groups. The isomer A is a liquid which is used as a solvent for nail polish. The isomer B is also a liquid. An aqueous solution of one of the lower homologues of B is used for preserving biological specimens in the laboratory
(a) What is compound A?
(b) Write the electron-dot structure of A.
(c) What is compound B?
(d) Write the electron-dot structure of B.
(e) Name the lower homologue of compound B  which is used in preserving biological specimens.

A colourless organic liquid X of molecular formula C₂H₄O₂ turns blue litmus to red. Another colourless organic liquid Y of molecular formula C₃H₆O has no action on any litmus but it is used as a nail polish remover. A yet another colourless organic liquid Z of molecular formula C₂H₆O has also no action on litmus but it is used in tincture of iodine.

(a) Name the liquid X. To which homologous series does it belong? Give the name of another member of this homologous series.
(b) Name the liquid Y. To which homologous series does it belong? Write the name of another member of this homologous series.
(c) Can you name an organic compound having the same molecular formula as liquid Y but which belongs to a different homologous series? What is this homologous series?
(d) Name the liquid Z. To which homologous series does it belong? Write the name of another member of this homologous series.