Question:
The most reactive metal among the following towards cold water is:
The most reactive metal among the following towards cold water is:
Updated On: Dec 20, 2024
- Aluminium
- Potassium
- Sodium
- Calcium
Hide Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
The reactivity of alkali metals (Group 1) increases down the group. Among the given options, potassium (K) is the most reactive metal towards cold water. It reacts violently, producing hydrogen gas and heat. Sodium (Na) also reacts readily with water, but less violently than potassium. Calcium (Ca) reacts with water, but more slowly. Aluminum (Al) reacts with water only very slowly at room temperature or not at all depending on surface oxide layer.
Was this answer helpful?
0
0
Top Questions on Metals and Non-Metals
- Name and explain the most widely used method for refining impure metals.
- CBSE Class X - 2024
- Science
- Metals and Non-Metals
- With the help of chemical equations, differentiate between roasting and calcination. How is metal reduced from the product obtained after roasting/calcination of the ore? Write the chemical equation for the reaction involved.
- CBSE Class X - 2024
- Science
- Metals and Non-Metals
- When a strip of aluminium metal is dipped in a solution of ferrous sulphate, the pale green colour of the solution fades away. State the conclusion you can draw from this observation. Write the chemical equation for the reaction that occurs in this case.
- CBSE Class X - 2024
- Science
- Metals and Non-Metals
- two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
Assertion (A): Silver oxide (\(\text{Ag}_2\text{O}\)) is an amphoteric oxide.
Reason (R): Metal oxides which react with both acids as well as bases are called amphoteric oxides.- CBSE Class X - 2024
- Science
- Metals and Non-Metals
- State giving reason the reduction process to obtain the following metals from their compounds:
(i) Mercury,
(ii) Copper and
(iii) Sodium- CBSE Class X - 2024
- Science
- Metals and Non-Metals
View More Questions
Questions Asked in CBSE X exam
- Prove that: \((\cot \theta - \csc \theta)^2 = \frac{1 - \cos \theta}{1 + \cos \theta}.\)
- CBSE Class X - 2024
- Trigonometry
- Assertion (A): The rainbow is a natural spectrum of sunlight in the sky.
Reason (R) : Rainbow is formed in the sky when the sun is overhead and water droplets are also present in air.- CBSE Class X - 2024
- Light - Reflection and Refraction
- Which of the following statement(s) is (are) true about human heart?
(a) Right atrium receives oxygenated blood from lungs through pulmonary artery.
(b) Left atrium transfers oxygenated blood to left ventricle which sends it to various parts of the body.
(c) Right atrium receives deoxygenated blood through vena cava from upper and lower body.
(d) Left atrium transfers oxygenated blood to aorta which sends it to different parts of the body.- CBSE Class X - 2024
- Circulatory System
- How does a physical activity facilitator maintain professional etiquettes?
- CBSE Class X - 2024
- Self-management Skills
- Assertion (A): The sum of the first fifteen terms of the AP $21, 18, 15, 12, \dots$ is zero.
Reason (R): The sum of the first $n$ terms of an AP with first term $a$ and common difference $d$ is given by: \[ S_n = \frac{n}{2} \left[ a + (n - 1) d \right]. \]- CBSE Class X - 2024
- Arithmetic Progression
View More Questions