English Medium कक्षा १० - CBSE Question Bank Solutions

A molecule of ammonia (NH₃) has

Which of the following are correct structural isomers of butane?

1. \[\begin{array}{cc}
   \ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\
   |\phantom{....}|\phantom{....}|\phantom{....}|\\
   \ce{H - C - C - C - C - H}\\
   |\phantom{....}|\phantom{....}|\phantom{....}|\\
   \ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\
   \end{array}\]
   
   
2. \[\begin{array}{cc}
   \ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\
   |\phantom{....}|\phantom{....}|\\
   \ce{H - C - C - C - H}\\
   |\phantom{.....}|\phantom{.....}|\\
   \ce{H}\ce{H-C-H}\ce{H}\\
   |\\
   \ce{H}\\
   \end{array}\]
3. \[\begin{array}{cc}
   \ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\
   |\phantom{....}|\phantom{....}|\\
   \ce{H - C - C - C - H}\\
   |\phantom{.....}\backslash\phantom{..}|\\
   \phantom{....}\ce{H}\phantom{......}\ce{C - H}\phantom{}\\
   \phantom{.......}|\\
   \phantom{.......}\ce{H}\\
   \end{array}\]
4. \[\begin{array}{cc}
   \ce{H}\phantom{...}\ce{H}\\
   |\phantom{....}|\\
   \ce{H - C - C - H}\\
   |\phantom{....}|\\
   \ce{H - C - C - H}\\
   |\phantom{....}|\\
   \ce{H}\phantom{...}\ce{H}\\
   \end{array}\]

`"CH"_3 - "CH"_2 - "OH" overset("Alkaline""KMnO"_4 + "Heat")(->) "CH"_3 - "COOH"`

In the above given reaction, alkaline KMnO₄ acts as 

Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of

The correct structural formula of butanoic acid is

Mineral acids are stronger acids than carboxylic acids because

1. mineral acids are completely ionised
2. carboxylic acids are completely ionised
3. mineral acids are partially ionised
4. carboxylic acids are partially ionised

Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of

Name the plant hormones responsible for the following

1. elongation of cells
2. growth of stem
3. promotion of cell division
4. falling of senescent leaves.

In the list of organisms given below, those that reproduce by the asexual method are

1. banana
2. yeast
3. dog
4. Amoeba 

Reproduction is essential for living organisms in order to

Exchange of genetic material takes place in

The substance that will be flattened on beating with a hammer is ______.

Metals are generally solid. Which of the following metals is in the liquid state at room temperature?

The table shows the electronic structures of four elements. 

1.  Identify which element(s) will form covalent bonds with carbon.
2. “Carbon reacts with an element in the above table to form several compounds.” Give suitable reason.

Which of the following is the correct observation of the reaction shown in the above set up?

The diagram shown below depicts pollination. Choose the options that will show a maximum variation in the offspring.

How are variations useful for species if there is drastic alteration in the niches?

"Carbon prefers to share its valence electrons with other atoms of carbon or with atoms of other elements rather than gaining or losing the valence electrons in order to attain noble gas configuration." Give reasons to justify this statement.

State the reasons, why carbon cannot

1. Lose four electrons to form C⁴⁺ cation and
2. Gain four electrons to form C^4- anion.

How does carbon overcome this problem to form compounds?