(i) Chalk contains calcium, carbon and oxygen in the ratio 10:3:12. Find the percentage of carbon in chalk. (ii) If in a stick of chalk, carbon is 3g, what is the weight of the chalk stick?
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Three wires whose lengths are in the ratio `3:8:18` and radii in the ratio `1:2:3` are connected in parallel. Find the ratio of the currents through t
Correct Answer - `2:3:3`
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Obtain approximately the ratio of the radii of iron `._(26)Fe^(56)` and calcium `._(20)Ca^(40)`. What is the approximate ratio of their nuclear mass d
Correct Answer - 1.12, 1
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A vessel of volume `2000cm^(3)` contains `0.1 mol` of oxygen and `0.2mol` of carbon dioxide. If the temperature if the mixture is `300K`, find its pre
Correct Answer - `3.74 xx 10^(5) Pa`
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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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Which of the following is CORRECT? (A) 1 mole of oxygen atoms contains 6.0221367 × 10^(23) atoms of oxygen.
(D) All of these 1 mole of atom or ions or molecule or particle contains \(6.0221367 × 10^{23}\) atoms, or ions or molecules or particles respectively. Hence, option (D) is right answer.
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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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The ratio of molecular weight of hydrogen and oxygen in water is 1 : 8. (The relation between hydrogen and oxygen in linear
Correct option is (A) y = 8x \(\because\) Quantities of hydrogen and oxygen are x and y and their quantity are in ratio 1 : 8. \(\therefore\) x : y = 1 : 8 \(\Rightarrow\) \(\frac xy=\frac18\) \(\Rightarrow\) y =...
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The ratio of molecular weight of hydrogen and oxygen in water is 1 : 8. (The relation between hydrogen and oxygen in linear
2 Answers
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There are 3 isotopes of carbon. Carbon-12, Carbon-13 and Carbon-14. The most abundant carbon isotope is carbon – 12.
Correct option is A) 12.01
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