Question:medium

Give the names of the elements present in the following compounds.
(a) Quick lime
(b) Hydrogen bromide
(c) Baking powder
(d) Potassium sulphate.

Updated On: Jan 19, 2026
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Solution and Explanation

Elements in Compounds

(a) Quick lime: 

Quick lime is also known as Calcium oxide (CaO).

Elements present: Calcium (Ca) and Oxygen (O).

(b) Hydrogen bromide:

Hydrogen bromide is represented as HBr.

Elements present: Hydrogen (H) and Bromine (Br).

(c) Baking powder:

Baking powder is a mixture of compounds, but the key ingredients are sodium bicarbonate and an acid, commonly NaHCO₃ (sodium bicarbonate) along with acids like tartaric acid.

Elements present: Sodium (Na), Hydrogen (H), Carbon (C)Oxygen (O).

(d) Potassium sulphate:

Potassium sulphate is represented as K₂SO₄.

Elements present: Potassium (K), Sulfur (S), and Oxygen (O).

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Questions Asked in CBSE Class IX exam

(Street Plan) : A city has two main roads which cross each other at the centre of the city. These two roads are along the North-South direction and East-West direction.

All the other streets of the city run parallel to these roads and are 200 m apart. There are 5 streets in each direction. Using 1cm = 200 m, draw a model of the city on your notebook. Represent the roads/streets by single lines. There are many cross- streets in your model. A particular cross-street is made by two streets, one running in the North - South direction and another in the East - West direction. Each cross street is referred to in the following manner : If the 2nd street running in the North - South direction and 5th in the East - West direction meet at some crossing, then we will call this cross-street (2, 5). Using this convention, find: 

(i) how many cross - streets can be referred to as (4, 3). 

(ii) how many cross - streets can be referred to as (3, 4).

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