Why is the conversion of ethanol to etha | Class 10 Science Chapter Carbon and Its Compound, Carbon and Its Compound NCERT Solutions

When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.

Outline a project which aims to find the dominant coat colour in dogs.

Draw the structure for the following compounds.                

       (i)    Ethanoic acid             (ii)   Bromopentane*
       (iii)  Butanone                   (iv)   Hexanal.

*Are structural isomers possible for bromopentane?

A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?

How is the sex of the child determined in human beings?

(a)  What property do all elements in the same column of the Periodic Table as boron have in common?
(b)  What property do all elements in the same column of the Periodic Table as fluorine have in common?

Calculate the number of electrons constituting one coulomb of charge.

A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?

What is an homologous series? Explain with an example.

Why is variation beneficial to the species but not necessarily for the individual?

In tobacco plant, the male gametes have twenty four chromosomes.
What is the number of chromosomes in the female gamete?
What is the number of chromosomes in the zygote?

A milkman adds a very small amount of baking soda to fresh milk.

   (a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
   (b) Why does this milk take a long time to set as curd?

Explain the formation of scum when hard water is treated with soap.

Draw the structure for the following compounds.                

       (i)    Ethanoic acid             (ii)   Bromopentane*
       (iii)  Butanone                   (iv)   Hexanal.

*Are structural isomers possible for bromopentane?

Give the pair of contrasting traits of the following characters in pea plant and mention which is dominant and recessive
(i) yellow seed         (ii) round seed

What is the difference between displacement and double displacement reactions? Write equations for these reactions.

Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.

A very small population of a species faces a greater threat of extinction than a larger population. Provide a suitable genetic explanation.

Write the balanced equation for the following chemical reactions.

1. Hydrogen  +  Chlorine  →  Hydrogen chloride
2. Barium chloride  +  Aluminium sulphate  →  Barium sulphate  +  Aluminium chloride
3. Sodium  +  Water  →  Sodium hydroxide  +  Hydrogen

A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive? Why or why not?