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What is the difference between Sulphur and sulphide?

Sulphur is a chemical compound with the symbol S and has the atomic number 16. Sulphide is an inorganic anion of sulphur. It has the chemical... View Article

Does phenol give Friedel Crafts reaction?

Phenol can undergo Friedel Crafts alkylation. For Friedel Crafts acylation, harsher conditions like higher temperature are required.... View Article

How strong is the strongest acid

The strongest superacid in the world is Fluoroantimonic Acid. It is prepared by mixing hydrogen fluoride and antimony pentafluoride. A superacid... View Article

What is the volume in PV=nRT

The ideal gas law is written as PV=nRT P is the pressure of the gas V is the volume of the gas n is the amount of the substance of the gas R is... View Article

How do you know which bond is stronger

The strength of the covalent bond can be determined by measuring the energy required to break the bond. The strength of the bond will increase as... View Article

Which has maximum covalent character

FeCl2 SnCl2 AlCl3 MgCl2 Answer: c) AlCl3 Reason As the cation charge... View Article

What is silica in food?

Silica or silicon dioxide is naturally present in some foods like beets, bell peppers, oats etc. It is also added to many foods and supplements.... View Article

What is the fastest thing in the universe?

The fastest thing in the universe is the speed of light in vacuum. Nothing travels faster than the speed of light which is equal to 3 x 108 m/s.... View Article

Which lens is used by the dentist?

Dentists do not use a lens, they use a concave mirror. The concave mirrors give a larger image of the object.... View Article

What Colour is oxygen

Oxygen gas is colourless, odourless and tasteless. The liquid and the solid form of oxygen is pale blue in colour... View Article

How do bonds work

A chemical bond is a force of attraction between the ions, atoms or molecules to form compounds. The bond will be due to the sharing of electrons... View Article

What is the meaning of cooling?

Cooling means the removal of heat which results in a lower temperature or a change in the phase. The decrease in temperature by any other method... View Article

Why is radium 226 unstable?

Radium-226 is a heavy nucleus and it is unstable. It emits radon 222 and alpha particle... View Article

What is the most unstable element?

Francium is the most unstable element that occurs naturally. The longest-lived isotope of francium, francium-223 has a half-life of only 22... View Article

Is the capacitor linear or nonlinear?

An ideal capacitor is a linear electrical element. The current flow is proportional to the applied voltage.... View Article

Are capacitors and inductors linear

Capacitors and inductors show linear characteristics. A linear element is one in which current and the voltage are directly proportional. If the... View Article

If in a triangle ABC, sin C + cos C + sin (2B + C) – cos (2B + C) = 2√2, the the triangle ABC is

(1) equilateral (2) scalene (3) isosceles right angled (4) obtuse angled Solution: Given sin C + cos C + sin (2B + C) - cos (2B + C) = 2√2... View Article

In a triangle ABC, if cos A cos B + sin A sin B sin C = 1 then a : b : c =

1) 1 : 2 : 3 2) 1 : 1 : 2 3) 1 : 1 : √2 (4) 1 : 1 : √3 Solution: Given cos A cos B + sin A sin B sin C = 1 If sin C = 1, then C = 900 Then... View Article

In a triangle, ABC, AD, BE, and CF are the altitudes, and R is the circumradius then the radius of the circle DEF is

1) 2R 2) R 3) R/2 4) none of these Solution: Consider ∆DEF EF = a cos A DE = c cos C DF = b cos B Let R1 is the circumradius of ∆DEF. R1 =... View Article

If the median AD of a triangle ABC divides the angle ∠BAC in the ratio 1:2, then sin B/sin C is equal to

(1) 2 cos A/3 (2) ½ sec A/3 (3) ½ sin A/3 (4) 2 cosec A/3 Solution: From sine rule in ∆ABD, AD/sin B = BD/sin A/3 …(i) Consider ∆ADC. By... View Article

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