English Medium इयत्ता १० - CBSE Question Bank Solutions

What is meant by homologous series of carbon compounds?

Classify the following carbon compounds into two homologous series and name them.

C₃H₄, C₃H₆, C₄H₆, C₄H₈, C₅H₈, C₅H₁₀

Write the name and formula of the 2nd member of homologous series having general formula C_nH_2n.

Write the name and formula of the 2nd member of homologous series having general formula C_nH_{2n + 2}.

Write the name and formula of the 2nd member of homologous series having general formula C_nH_{2n – 2}.

Write the molecular formula of two consecutive members of homologous series of aldehydes. State which part of these compounds determines their

1. physical and 
2. chemical properties

Why does the cord of an electric heater not glow while the heating element does?

Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.

An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.

An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

Why is the tungsten used almost exclusively for filament of electric lamps?

Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?

How does the resistance of a wire vary with its area of cross-section?

Write the molecular formula of first two members of homologous series having functional group -Cl.

Write the molecular formula of first two members of homologous series having functional group −Br.

Write the molecular formula of first two members of homologous series having functional group – OH

The following vegetables are kept in a basket :

Potato, Tomato, Radish, Brinjal, Carrot, Bottle-gourd

Which two of these vegetables correctly represent the homologous structures?

(A) Carrot and Tomato

(B) Potato and Brinjal

(C) Radish and Carrot

(D) Radish and Bottle-gourd

Write the molecular formula of the 2^nd and 3^rd member of the homologous series where the first member is ethyne.

Write Joule's law of heating.

An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater. 

(a) How much charge flows around the circuit each second?