The skeleton of Echinoderms is made of
A) Calcium carbonate
B) Sodium carbonate
C) Sodium silicate
D) Magnesium carbonate
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A sample of calcium carbonate (CaCO3) has the following percentage composition : Ca = 40 %; C = 12 %; O = 48 %.
(C) 1.6 g Law of constant proportional, state that "the individual elements that constitute a chemical compound are always present in a fixed ratio (by mass)". This ratio does not depend on the...
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A sample of calcium carbonate (CaCO3) has the following percentage composition : Ca = 40 %; C = 12 %; O = 48 %.
2 Answers
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Bone is made up of A) calcium phosphate B) calcium carbonate
C) calcium phosphate & calcium carbonate
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Calcium phosphate and Calcium carbonate in bones are secreted by …………….
Correct option is D) Matrix
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Calcium carbonate structures from the skeleton of A) Echinodermata
Correct option is B) Mollusca
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Match the following i) Sodium bi-carbonate ii) Sodium Carbonate
B) i – z, ii – x, iii – y
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Which of the following gases puts off the matchstick when calcium carbonate is heated ?
Correct option is C) CO2
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Calcium carbonate occurs naturally in which forms?
Calcium carbonate (CaCO3) occur naturally in the form of chalk, limestone and marble.
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Mention some physical properties of calcium carbonate.
Calcium carbonate is soft, light, white powder. It is practically insoluble in water.
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Assertion (A) : Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide . Reason (R) : Beryllium carbonate is unstab
Correct Answer - A Both A and R are correct and R is the corret explanation of A .
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