Where metalloids are placed in the periodic table?
Metalloids are placed on the right – hand side of the periodic table. Metalloids occupy a diagonal area running from... View Article
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Kerosene is not a fossil fuel true or false?
False. Kerosene is a derivative of fossil fuel. Kerosene is derived after undergoing a huge series of chemical process which... View Article
CO2 can be easily liquified and even solidified because: A. It has a weak force of attraction B. It has comparatively more force of attraction than other gases C. It has more intermolecular space D. It is present in the atmosphere
CO2 is a gas. Therefore, it will have low inter-molecular force of attraction between the molecules of carbon dioxide. Carbon... View Article
How to make a pale yellow colour by mixing two colours?
Yellow lies between red and green. If you mix red and green you will get a yellow hue. Yellow is... View Article
What is masking and demasking agents in analytical chemistry?
A masking agent is a reagent used in chemical analysis which reacts with chemical species that may interfere in the... View Article
Give examples of Basic salt, Complex Salt and Normal Salt.
Answer: An ionic compound that is formed by the reaction called neutralization reaction of an acid and a base is... View Article
What is the valency of Calcium carbonate?
The valency of the element is decided by the number of valence electrons. The calcium carbonate is CaCO3. The valency... View Article
Cement is made hard by A. Dehydration B. Hydration and dissociation of water C. Dissociation of water D. Polymerisation
Cements (e.g., Portland cement) is harden because of hydration, chemical reactions that occur independently of the mixture’s water content; they... View Article
How many grams of dibasic acid (mol.wt 200) should be present in 100 ml of aqueous solution to give 0.1N
The n-factor of a dibasic acid = 2 Molarity = Normality/n-factor = 0.1/2 = 0.05 Number of moles = Molarity... View Article
Beating aluminium to make Aluminium foil is a physical or chemical change?
Beating of aluminium metal to make aluminium foil is a physical change because while beating, moulding, heat pressing and fabrication... View Article
Write the chemical formula for zinc acetate antimony trioxide
Zinc acetate is a salt with the formula Zn(CH3CO2)2. Antimony trioxide, used as a component in flame retardant applications. Antimony... View Article
What is formula for soda water?
Carbonated water , also known as soda water , sparkling water , or seltzer water , is plain water into... View Article
The electrolytic decomposition of water gives H2 and O2 in the ratio of a) 1: 2 by volume (b) 2: 1 by volume (c) 8: 1 by mass (d) 1: 2 by mass
Answer: (b) 2: 1 by volume The electrolysis of water is the dissociation of water (H2O) into hydrogen gas (H2) and... View Article
Comment on the statement. The thermal conductivity of solid metals increases with rise in temperature.
Thermal conductivity of solid metals with rise in temperature normally decreases. Some factors are known to influence the thermal conductivity... View Article
Explain the importance of ph testing in everyday life?
Answer: pH is defined as the measure of hydrogen ion concentration which is used for measuring the acidity or alkalinity... View Article
From where Coke and Coal Tar are obtained?
Coke is a high-carbon product obtained by the destructive distillation of coal. Coal is one of the most useful fossil... View Article
What is polychromatic light?
A source of light which gives light of several wave lengths (hence several colours) is called a polychromatic source of... View Article
What is observed when dilute sulphuric acid is added to solid sodium carbonate?
Answer: When dilute sulphuric acid is added to sodium carbonate, the corresponding salt, sodium sulphate and water are formed and... View Article
The types of bond present in N2O5 are: (1) only covalent (2) only ionic (3) ionic and covalent (4) covalent and coordinate
Answer: (4) Covalent and coordinate Covalent bond – Covalent bond is defined as the bond formed due to sharing of... View Article
Why is the internal resistance of a secondary cell low?
Distance between two plates is greater and their sizes are big in secondary cells. There is no polarization in secondary... View Article
