Oil and Fat containing food items are flushed with Nitrogen. Why?
Answer: The main objective of flushing Nitrogen into food packets containing oil and fat products is to avoid rancidity, which... View Article
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A shiny brown coloured element ‘X’ on heating in the air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.
Answer: copper The shiny brown coloured element is Copper metal. As copper is heated in the air, it reacts with... View Article
Explain the following in terms of gain of oxygen with two examples each. (a) Oxidation (b) Reduction
Answer: Oxidation and reduction reactions are two chemical reactions that often occur together. There is an electron exchange in this... View Article
In the refining of Silver, the recovery of silver from Silver nitrate solution involves displacement reaction by Copper metal. Write down the reaction involved.
Answer: Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s) Displacement reaction The type of reaction is a displacement reaction. Displacement reaction... View Article
What is meant by exothermic and endothermic reactions? Give examples.
Answer: In a chemical reaction, energy is used for breaking the bonds of the reactants also energy is used in... View Article
Write a balanced chemical equation for the following and identify the type of reaction of each case KBr + BaI2 → KI + BaBr2 ZnCO3 → ZnO + CO2 H2+ Cl → HCl Mg + HCl → MgCl2 + H2
Answer: The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation... View Article
Translate the following statements into chemical equations and balance them. (a) Hydrogen gas combines with nitrogen to form ammonia. (b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide. (c) Barium chloride reacts with aluminium sulphate to give Aluminium chloride and a precipitate of barium sulphate. (d) Potassium metal reacts with water to give potassium hydroxide and Hydrogen gas.
Answer: The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation... View Article
What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer. (1) Hydrogen gas and Iron chloride are produced. (2) Chlorine gas and Iron hydroxide are produced. (3) No reaction takes place. (4) Iron salt and water are produced.
Answer: (1) Hydrogen gas and iron chloride are produced. Let us consider the reaction between acid and metal Acid +... View Article
Which of the statements about the reaction below are incorrect? 2PbO(s) + C(s) → 2Pb(s) + CO2(g) (a) Lead is getting reduced (b) Carbon Dioxide is getting oxidised (c) Carbon is getting oxidised (d) Lead oxide is getting reduced (i) (a) and (b) (ii) (a) and (c) (iii) (a), (b) and (c) (iv) all
Answer: (i) (a) and (b) 2PbO(s) + C(s) → 2Pb(s) + CO2(g) Reduced substance – Pb Pb2+ + 2e– →... View Article
Identify the substances that are oxidized and that are reduced in the following equation. (i) 4Na(s) + O2(g) → 2Na2O(s) (ii) CuO(s) + H2(g) → Cu(s) + H2O(l)
Answer: The oxidized substance is called a reduction agent. The reduced substance is called an oxidizing agent. (i) 4Na(s) +... View Article
Write a balanced chemical equation with state symbols for the following reactions (i) Solutions of Barium chloride and Sodium sulphate in water react to give insoluble Barium sulphate and solution of Sodium chloride. (ii) Sodium hydroxide solution in water reacts with hydrochloric acid solution to produce Sodium chloride solution and water.
Answer: The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation... View Article
21 May 2021: UPSC Exam Comprehensive News Analysis
CNA 21st May 2021:- Download PDF Here TABLE OF CONTENTS A. GS 1 Related B. GS 2 Related INTERNATIONAL RELATIONS... View Article
François Bernier [1620 – 1688]
Francois Bernier, a French physician, political philosopher, traveler, and historian, lived in India for 12 years. He was associated with... View Article
Al Masudi [AD 896 – AD 956]
Al-Masudi full name Abū al-Ḥasan ʿAlī ibn al-Ḥusayn al-Masʿūdī is an Arab scholar who came to India in 10th century... View Article
National Mission for Manuscripts
India has a vast trove of ancient manuscripts. These are valuable objects that help in the study of our past,... View Article
PM-DMs Interaction Outcomes: RSTV- Big Picture
PM-DMs Interaction Outcomes:- Download PDF Here Anchor: Kriti Mishra Participants: Dr. B.L. Sherwal, Director, Rajiv Gandhi Superspeciality Hospital, New Delhi.... View Article
20 May 2021: PIB Summary & Analysis
May 20th, 2021, PIB:- Download PDF Here TABLE OF CONTENTS 1. World Bee Day 2. Competition Commission of India (CCI)... View Article
Ibn Battuta [1304 – 1369]
Ibn Battuta full name Muhammad Ibn Battuta was a Moroccan traveller who left his home at a young age of... View Article
Alberuni [AD 973- AD 1048] Abu Rayhan Muhammad Ibn Ahmad
Alberuni, short for, Abu al-Rayhan Muhammad ibn Ahmad al-Biruni, was a renowned philosopher, mathematician, historian and one of the jewels... View Article
20 May 2021: The Hindu Analysis
UPSC Current Affairs Preparation: The Hindu Analysis Watch expert analysis of ‘The Hindu’ dated 20th May 2021. Important news and... View Article
