English Medium कक्षा १० - CBSE Question Bank Solutions

Write the chemical formula of two consecutive homologous of organic compounds having functional group - OH. 

What happens to the (i) boiling point and (ii) solubility of organic compounds of a homologous series as the molecular mass increases?

What is the heating effect of electric current?

Write an expression for the amount of heat produced in a resistor when an electric current is passed through it stating the meanings of the symbols used.

Consider the carbon compounds having following molecular formula:

(i) C₃H₆ (ii) C₃H₈ (iii) C₄H₆ (iv) C₆H₆ (v) C₆H₁₂

1. State the number of double covalent bonds present in C₃H₆.
2. Write the formula of first member of the homologous series to which the carbon compound C₄H₆ belongs.
3. Which one of the above compounds forms a ring structure of carbon atoms?
4. Identify, which of the above compounds, is a member of alkane series.

Consider the following molecular formulae of carbon compounds:

(i) CH₃COOH (ii) CH₃OH (iii) C₂H₆ (iv) C₃H₄ (v) C₄H₈ 

1. Which one of these compounds belongs to homologous series of alcohols?
2. Identify the compound having triple bond between carbon-carbon atoms.
3. Write the molecular formula of the first member of the homologous series to which CH₃COOH belongs.
4. Write the general formula of the series to which the compound C₄H₈ belongs.

Consider the carbon compounds having following molecular formula:

(i) C₂H₂ (ii) C₂H₅ (iii) C₃H₇OH (iv) C₂H₆COOH (v) CH₃CHO

1. Identify which one of the above compounds, is a member of aldehyde series.
2. Write the general formula of the series to which compound C₂H₂ belongs.
3. Which one of the above compounds has triple bonds between carbon-carbon atoms?
4. Write the molecular formula of the first member of the homologous series to which the compound C₃H₇OH belongs.

Consider the carbon compounds having following molecular formula:

(i) C₃H₆ (ii) C₃H₈ (iii) C₄H₆ (iv) C₆H₆ (v) C₆H₁₂

1. State the number of double covalent bonds present in C₃H₈.
2. Write the formula of first member of the homologous series to which the carbon compound C₄H₆ belongs.
3. Which one of the above compounds forms a ring structure of carbon atoms?
4. Identify, which of the above compounds, is a member of alkane series.

A ray of light starting from diamond is incident on the interface separating diamond and water. Draw a labelled ray diagram to show. the refraction of light in this case.

Name and draw the electron dot structure of first homologue of alkynes series.

Name the third homologue of alcohols.

Name the third homologue of aldehydes.

State the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit.

Anannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three-pin plug, whereas an electric bulb can be connected with a two-pin plug?

She wrote: Three-pin connections reduce heating of connecting wires.

1. Is her answer correct or incorrect? Justify.
2. What is the function of a fuse in a domestic circuit?

An electric iron of resistance 20 Ω draws a current of 5 A. The heat developed in the iron in 30 seconds is ______.

What determines the rate at which energy is delivered by a current?

An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.

Which of the following terms does not represent electrical power in a circuit?

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be ______.

Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?