Question

1. 2. 40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left after cooling to room temperature is (a) 40 ml CO2 gas (c) 60 ml CO2 gas and 60 ml H2O gas (b) 40 ml CO2 gas and 80 ml H2O gas (d) 120 ml CO2 gas An element X has the following isotopic composition 200X = 90 %, 199X = 8 % and 202X = 2 %. The weighted average atomic mass of the element X is closest to (a) 201 u (b) 202 u (c) 199 u 3. (d) 200 u Assertion : Two mole of glucose contains 12.044 Reason : 1022 1023 molecules of glucose Total number of entities present in one mole of any substance is equal to 6.02 (a) both assertion and reason are true and the reason is the correct explanation of assertion (b) both assertion and reason are true but reason is not the correct explanation of assertion (c) assertion is true but reason is false (d) both assertion and reason are false 4. 5. Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant? (a) Carbon (c) both carbon and oxygen (b) oxygen (d) neither carbon nor oxygen The equivalent mass of a trivalent metal element is 9 g eq-1 the molar mass of its anhydrous oxide is (a) 102 g (b) 27 g (c) 270 g (d) 78 ​

Answer 1

Answer:

1. (a)If 40 ml of methane is completely burnt using 80 ml of oxygen, then 40ml of CO2 and 80ml of H2O (Vapour) will be formed. When cooled to room temperature, only 40ml of CO2 gas will remain because water will be in liquid form.
2. (b)The element X has the following isotopic composition: X200 = 90%, X199 = 8.0%,X202 = 2.0% The weighted average atomic mass of the naturally occurring X is.
3. (c) assertion is true and reason is false. Explanation:- two moles of gulcose contains 12.044 × 10²³ molecule of glucose. because each mole of given compound/element/species contains 6.022 × 10²³ molecules/atoms/ions. ... and experimentally we get 1 mole = 6.022 × 10²³ entities.
4. The constant equivalent mass element in carbon dioxide and carbon monoxide is b) oxygen. and CO. If two elements are combined to form two different compounds with a fixed mass of their elements, then it forms the simplest whole number ratio.
5. (a), 102 grams. As per as the Question, metal is trivalent, It means it can loose three electrons to complete its octet. = 27 grams. = 102 grams.