1) metal hydroxide decomposed by heat into  a) metal oxide + water b) metal + water 2) metal nitrat decomposed by heat  a) metal nitrite+nitrogen b) metal nitrite + oxgyen 3) mercuric oxide decomposed by heat into a) mercury + hydrogen b) mercury +oxygen 4) sodium a) monovalent b) divalent 5) aluminium a) divalent b) trivalent 6) potassium a) monovalent b) divalent 7) copper sulphate decomposed by heat into a) cupper + sulphure trioxide b) cupperoxide + sulphure trioxide 8) in decomposition of copper carbonate the color change from   a) green to black b) yellow to black 9) the true equation for decomposition of sodium azide a) NaN3...............2Na + 2N3 b) 2NaN3............. 2Na + 3N3 10) in decomposition of sodium nitrate the color change from a) yellow to yellowish white  b) white to yellowish white 

lesson 1 science prep3

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