English Medium कक्षा १० - CBSE Question Bank Solutions

Assertion (A): In a homologous series of alcohols, the formula for the second member is C₂H₅OH and the third member is C₃H₇OH.
Reason (R): The difference between the molecular masses of the two consecutive members of a homologous series is 144.

Which of the following does not belong to the same homologous series?

Successive members of a homologous series vary by how many atomic mass unit?

C₃H₈ belongs to the homologous series of ______.

Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is:

The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is:

Calculate the current flows through the 10 Ω resistor in the following circuit.

A coil in the heater consumes power P on passing current. If it is cut into halves and joined in parallel, it will consume power:

Three resistors of 1 Ω, 2 Ω and 3 Ω are connected in parallel. The combined resistance of the three resistors should be:

Assertion: When a battery is short circuited, the terminal voltage is zero.

Reason: In a short circuit, the current is zero.

You are given four ammeters A, B, C and D having the least counts mentioned below:

(I) Ammeter A with least count 0.25 A

(II) Ammeter B with least count 0.5 A

(III) Ammeter C with least count 0.05 A

(IV) Ammeter D with least count 0.1 A

Which of the ammeters would you prefer for doing an experiment to determine the equivalent resistance of two resistances most accurately, when connected in parallel?

Which of the following does not belong to the same homologous series?

The first member of alkyne homologous series is

The shape of guard cells changes due to change in the

A carbon compound ‘A’ having melting point 156K and boiling point 351K, with molecular formula C2H6O is soluble in water in all proportions.

1. Identify ‘A’ and draw its electron dot structure.
2. Give the molecular formulae of any two homologues of ‘A’.

The diagram above is a schematic diagram of a household circuit. The house shown in the above diagram has 5 usable spaces where electrical connections are made. For this house, the mains have a voltage of 220 V and the net current coming from the mains is 22A.

1. What is the mode of connection to all the spaces in the house from the mains?
2. The spaces 5 and 4 have the same resistance and spaces 3 and 2 have respective resistances of 20Ω and 30Ω. Space 1 has a resistance double that of space 5. What is the net resistance for space 5.
3. What is the current in space 3?
4. What should be placed between the main connection and the rest of the house’s electrical appliances to save them from accidental high electric current?

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?

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.