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Characteristic flame colour: specific metals and their salts impart particular colours to Bunsen burner flame.
(1) Pb (plumbum) impart pale greenish colour to the flame.
(2) Cu and Cu salts impart blue or green colour to the flame.
(3) Borates as well impart green colour to the flame.
(4) Ba and its salts impart apple green colour to the flame.
(5) Sr imparts crimson red colour to the flame.
(6) Ca imparts brick red colour to the flame.
(7) Na imparts yellow colour to the flame.
(8) K imparts pink-violet (Lilac) colour to the flame.
(9) Li imparts crimson-red, Rb imparts violet and Cs imparts violet colours to the flame.
(10) Livid- blue flame is given by As, Sb and Bi.
Number of nodal centres for 2s orbital: (1) 1 (2) 0 (3) 4 (4) 3 Ans: 1
Determine the density of cesium chloride which crystallises in bcc type structure with the edge length 412.1 pm.The atomic masses of Cs & Cl are 133 & 35.5 respectively. Solution
A compound exists in 2 forms. One them produces 2moles of AgBr while the other produces 1mole of AgBr with AgNO3
Ionic bonds are usually formed by combination of elements with: (1) High ionisation potential and low electron affinity (2) Low ionisation potential and high electron affini
The number of unpaired electrons in a chromic ion Cr 3+ (atomic number = 24) is: (1) 6 (2) 4 (3) 3 (4) 1 Ans: 3
While solving lime sida numericals we calculate CACO3 equivalent .In this we do conc. In ppm×100/mol. Wt. ssomewhere we multiply 2 × m. Wt .so wht 2
s block
The molar concentration of an HCl solution is 12.4 mol/L. How many moles of Hcl is in 1.50 L of HCl solution
What was the color and approximate pH of the cabbage juice indicator solution before any electrolysis was attempted? What was the resulting color and approximate pH of the solution
trailing of mercury
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