A shiny brown-coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.

-

Ques 17: : A shiny brown-coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.  


Ans 17: ‘X’ is copper (Cu) and the black-coloured compound formed is copper oxide (Cu O). 


««Previous question            Next question»»

Comments

Post a Comment

Popular posts from this blog

Diagonal Relationship between Beryllium and Aluminium || Relation between Beryllium and Aluminium

-
  Diagonal Relationship between Beryllium and Aluminium The ionic radius of Beryllium (Be 2+) is estimated to be nearly 31 pm; the charge/radius ratio Or e/m ratio is nearly the same as that of the Al 3+ ion. Hence beryllium resembles aluminium in these ways. Some of the similarities are given below: » Like Aluminium, Beryllium(be) is not readily attacked by acids H+ donor because of the formation of an oxide film on the surface of the metal by reacting with oxygen, i.e. they are rendered passive by nitric acid. » Beryllium hydroxide[[Be(OH)4]2] dissolves in excess of alkali to give a beryllate ion, [ Be(OH)4]2– just as aluminium hydroxide[Al(OH)3] gives aluminate ion, [Al(OH)4] » The chlorides of metals beryllium and aluminium have Cl– bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solvents and are strong as Lewis acids They are used as Friedel Craft catalysts. » Beryllium(Be) and aluminium(Al) ions have strong tendency to form complexes, (Be...
Read more

Vistas Chapter-2 The Tiger King || Revision Notes Class 12 Board Exams

-
                                            Vistas                                           Chapter -2                                      The Tiger King   “The Tiger King” is a story of an arrogant King who disproved the prophecy of the astrologer, but destiny proved to be powerful and the prediction which was made when the king was ten days old comes out to be true. The Maharaja Sir Jilani Jung Jung Bahadur was called “Tiger King”. When he was just 10 days old he asked intelligent questions to the astrologers and was told that he would be killed by a tiger. He uttered “Let tigers beware!” No other miracle took place, the child grew like any other Royal child drinking whit...
Read more

Solar System, Planets, Moons, Asteroid Belt,Kuiper Belt and Oort Cloud, Comets and Meteoroids

-
Image
 The solar system consists of the Sun, which is a star at its center, and all the celestial bodies bound by its gravitational pull. These bodies include planets, moons, asteroids, comets, and other objects. Key Components of the Solar System: The Sun : The Sun is the center of the solar system and contains about 99.86% of its mass. It is a star primarily composed of hydrogen and helium, providing the heat and light that sustains life on Earth. Planets : There are eight recognized planets in the solar system: Mercury : The closest planet to the Sun, known for extreme temperature variations and no atmosphere. Venus : Similar in size to Earth but with a thick, toxic atmosphere and surface temperatures hot enough to melt lead. Earth : The third planet from the Sun, the only known planet to support life, with water and a breathable atmosphere. Mars : Known as the Red Planet, it has a cold, dry surface and signs of past water. Jupiter : The largest planet, a gas giant, w...
Read more

Motion in a straight line || 1-D motion || Rectilinear motion || Straight path motion || Chapter 3 Physics || Notes ||

-
                      1.   Introduction   Motion is change in position of an object with time.  In this chapter, we shall learn how to describe motion. For this, we develop the concepts of velocity and acceleration. We shall confine ourselves to the study of motion of objects along a straight line, also known as rectilinear motion. For the case of rectilinear motion with uniform acceleration, a set of simple equations can be obtained. Finally, to understand the relative nature of motion, we introduce the concept of relative velocity. In our discussions, we shall treat the objects in motion as point objects. This approximation is valid so far as the size of the object is much smaller than the distance it moves in a reasonable duration of time. In a good number of situations in real-life, the size of objects can be neglected and they can be considered as point-like objects without much error.   ...
Read more

IPL 2023 Season Summary || Moments of IPL 2023

-
  -  GT vs CSK  - Tushar Deshpande, the first-ever impact sub, proves too expensive. Williamson tears his ACL -  LSG vs DC  - Mark Wood fifer decimates Delhi -  RCB vs MI  - Back at Chinnaswamy, RCB smash MI. Kohli and Faf both got fifties -  CSK vs LSG  - CSK win a high scoring thriller by 12 runs. The difference - Dhoni's two sixes at the death -  KKR vs RCB  - Visitors outdone by spin. Suyash Sharma gets 3 on debut. Varun takes 4 and Shardul scores a match-winning 50 -  MI vs CSK  - Welcome back, Ajinkya Rahane. Scores his fastest IPL fifty -  GT vs KKR  - The Rinku game. Nothi ng more to say -  RCB vs LSG  - Pooran, Stoinis chase down 212. Avesh throws his helmet. Gambhir shushes the crowd. Harshal's failed mankad attempt -  DC vs MI  - MI win off the final ball, running 2 runs. Although Nortje nails 6 out of 6 Yorkers -  RR vs CSK  - Vintage Dhoni almost wins CSK an improbable g...
Read more