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51.

which among the following contains 12 atoms of oxygen ?A. 6 molecules of calcium oxideB. 6 molecules of waterC. 3 molecules of sodium bicarbonateD. 4 molecules of calcium carbonate

Answer» Correct Answer - D

D. 4 molecules of calcium carbonate.

Because 4 CaCO3. 

Since each molecule of CaCO3 contains 3 atoms of Oxygen.

Therfore 4 molecults of CaCO3 contains 4x3 =12 atoms.
Discussion
52.

Identify the combining power of the elements present in the following compoundsA. `A_(2)B`B. `X_(2)Y_(3)`C. `DE_(2)`D. `G_(3)H_(2)`

Answer» (a) In `A_(2)B` combining powers `A to 1, B to 2`
(b) In`X_(2)Y_(3)` combining powers `X to 3, Y to 2`
In `DE_(2)` combining powers `D to 2, E to 1`
(d) In `G_(3) H_(2) ` combining powers `G to 2 , H to 3`
Discussion
53.

Find of the total number of atoms in the following : (a) 1 molecule of aluminium sulphate (b) 1 molecule of potassium phosphate (c ) 1 molecule of magnesium nitride

Answer» (a) Aluminium sulphate ` to AI_(2) (SO_(4))_(3) to 17` atoms
(b) Potassium phosphate ` to K_(3) PO_(4) to 8` atoms
(c ) Magnesium nitride `to Mg_(3) N_(2) to 5` atoms
Discussion
54.

Name the elements with the following symbols. (a) C (b) N (c ) Si (d) Br (e ) Cl (f) Ag (g) W (h) Hg (i) Co (j) Cr

Answer» `{:("(a) Carbon ",,"(b) Nitrogen "),("(c) Silicon ",,"(d) Bromine "),("(e) Chlorine ",,"(f) Silver "),("(g) Tungsten",,"(h) Mercury"),("(i) Cobalt ",,"(j) Chromium "):}`
Discussion
55.

Write the compounds of aluminium with the following elements Oxygen , Sulphur, Nitrogen.

Answer» `AI " and " O rArr AI to 3, O to 2 rArr AI_(2) O_(3)`
`AI " and " S rArr AI to 3, S to 2 rArr AI_(2) S_(3)`
`AI" and " N rArr AI to 3, N to 3 rAr AIN`
Discussion
56.

One molecule of which among the following elements possesses the maximum number of atoms?A. OzoneB. SulphurC. ChlorineD. Nitrogen

Answer» Correct Answer - B
Discussion
57.

Write the symbols for the following elements. (a) Boron (b) Sulphur (c ) Argon (d) Calcium (e ) Selenium (f) Copper (g) Lead (h) Barium

Answer» (a) B " " (b) S " "(C ) Ar " " (d) Ca`
`(e ) Se" "(f) Cu" " (g) Pb" "(h) Ba`
Discussion