A metal ‘X’ is used in thermite process. When X is burnt in air it gives an amphoteric oxide ‘Y’. ‘X’ and ‘Y’ are respectively :
https://www.youtube.com/watch?v=RD6qPT9rf3g Explanation: Here, the metal used in the thermite process is aluminium (Al). When aluminium is burned in air, it produces aluminium oxide (Al₂O₃), which is an amphoteric oxide. So […]
MnO₂ + x HCl → MnCl₂ + y H₂O + z Cl₂
In order to balance the above chemical equation, the values of x, y and z respectively are : a) 6, 2, 2 b) 4, 1, 2 c) 4, 2, 1 […]
In domestic electric circuits the wiring with 15 A current rating is for the electric devices which have
https://youtu.be/InsmjBcIrY0 This question is about which type of electrical devices are typically connected to wiring with a 15 amp current rating in domestic electric circuits. The answer is (a), higher […]
If four identical resistors, of resistance 8 ohm, are first connected in series so as to give an effective resistance Rs, and then connected in parallel so as to give an effective resistance Rp, then the ratio Rp/Rs is
https://www.youtube.com/watch?v=Z0XB7oLo8ww The question is about resistors connected in series and parallel. It asks for the ratio of the effective resistance when the resistors are connected in series (Rs) to the […]
CBSE Class 10 Science – Chapter 2: Acids, Bases and Salts – Detailed Notes & Explanation
Indicators An indicator is a dye which changes color when it is added to an Acid or a Base. Some major types of acid – base indicators are as follows – Natural […]
Class 10 CBSE Science – Chapter 1: Chemical Reactions & Equations – Detailed Notes & Explanation
Physical and Chemical Changes Physical Change – Physical change is a change in which only some of the physical properties of a substance undergoing change are altered temporarily but the […]
The emission of brown fumes in the given experimental set-up is due to
https://youtu.be/YwyP-bDU6Tk Here is the Explanation: The correct option is (a) thermal decomposition of lead nitrate which produces brown fumes of nitrogen dioxide. When lead nitrate (Pb(NO₃)₂) is heated, it decomposes […]
In the experimental setup given below, it is observed that on passing the gas produced in the reaction in the solution X, the solution X first turns milky and then colourless.
https://youtu.be/V6Hg_xyNO_k The option that justifies the above stated observation is that ‘X’ is aqueous calcium hydroxide and (a) it turns milky due to carbon dioxide gas liberated in the reaction […]
CBSE Class 10 Previous Year Question Papers
Master your CBSE Class 10 exam preparation with official past question papers! This blog page provides a one-stop shop for all your CBSE Class 10 past question paper needs. Download […]
