Answer the following questions:
Identify Dobereiner's triads from the following groups of elements having similar chemical properties:
Mg(24.3),Ca(40.1),Sr(87.6)
S(32.1),Se(79.0),Te(127.6)
Be(9.0), Mg(24.3), Ca(40.1).

Identify dobereiner's traids from the following group of elements having similar chemical properties : Mg(24.3),Ca(40.1),Sr(87.6)

Identify dobereiner's traids from the following group of elements having similar chemical properties : Be(9.0),Mg(24.3),Ca(40.1)

Identify dobereiner's traids from the following group of elements having similar chemical properties : S(32.1),Se(79.0),T(127.6)

Answer the following questions: In Dobereiner's triad containing Li,Na,K if atomic masses of lithium and potassium are 6.9 and 39.1, then what will be the atomic mass of sodium ?

Solve the following questions. (iii) Find the co-ordinates of the centroid of Delta ABC if A(-3,2) ,B (-6,-1) and C (0,5) are its vertices.

Answer the following questions.Evaluate |(1,-3,12),(0,2,-4),(9,7,2)|

Answer the following questions: Classify each of the following into kinetic energy, potential energy or kinetic energy and potential energy: (1) A compressed spring (2) The wound up spring of a watch (3) A raised hammer (4) A bullet released from a gun (5) A falling stone (6) The swinging pendulum of a clock (7) The explosive mixture in a bomb (8) wind (9) Water stored in a dam (10) A stretched bow string (11) Running water (12) waterfall.

Answer the following questions.If A=[[1,2],[3,2],[-1,0]] and B=[[,1,3,2],[4,-1,-3]] ,show that AB is singular matrix.

Choose the correct alternative answer for each of the following question : The simplified from of (-1)^3xx(-1)^6 is ……

Answer the following questions:Show that the points (2,-1),(0,2),(2,3) and (4,0) are the vertices of a parallelogram.Also find the acute angle between the diagonals.