Account for the following observations. \(AlCl_{3}\) is a Lewis acid.
Answer
As we know mostly electron-deficient species are known as Lewis acids and these species have vacant orbitals. In case of \(AlCl_3\),\( Al \) has only six electrons in its valence shell.Thus, it is electron-deficient species and has a tendency to accept an electron. Therefore, act as Lewis acid.
The following questions consist of two statements – Assertion (A) and Reason (R). Assertion (A) : Amphibians have gills as well as lungs for respiration. Reason (R) : Amphibians were the first animals to come out of water. Mark the correct choice as:( )
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
The following questions consist of two statements — Assertion (A) and Reason (R). Assertion (A) : \(Marsilea\) and ferns are referred to as cryptogams. Reason (R) : Cryptogams have inconspicuous or hidden organs. Mark the correct choice as: ( )
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
See the figure and find the following: (i) The coordinate of the point B (ii) The coordinate of the point c (iii) The point identified by the coordinates? \( \left(-3,-5\right)\) (iv) point identified by the coordinates \( \left(2,-4\right)\) (v) The abscissa of the point D (vi) The ordinate of the point H (vii) The coordinates of the point L (viii) The coordinates of the point M