question_answer2) Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (at. wt. of Fe is 56) present in one molecule of haemoglobin are: [AIPMT 1998]
question_answer3) An organic compound containing C, H and N gave the following results on analysis C = 40%, H = 13.33%, N = 46.67%. Its empirical formula would be: [AIPMT 1998]
question_answer4) In the reaction \[4N{{H}_{3}}(g)+5{{O}_{2}}(g)\to \]\[4NO(g)+6{{H}_{2}}O(l)\] when 1 mole of ammonia and 1 mole of \[{{O}_{2}}\] are made to react to completion then : [AIPMT 1998]
question_answer6) An organic compound containing C, H and N gave the following analysis C = 40% H = 13.33% and N = 46.67%. Its empirical formula would be: [AIPMT 1999]
question_answer7) Assuming fully decomposed, the volume of \[C{{O}_{2}}\] released at STP on heating 9.85 g of \[BaC{{O}_{3}}\] (Atomic mass, Ba = 137) will be: [AIPMT 2000]
question_answer9) Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt. = 78.4), then minimum molecular weight of peroxidase anhydrous enzyme is: [AIPMT 2001]
question_answer10) Specific volume of cylindrical virus particle is \[6.02\times {{10}^{-2}}\,cc/g\] whose radius and length are \[7\,\overset{o}{\mathop{A}}\,\] and \[10\,\overset{o}{\mathop{A}}\,\] respectively. If \[{{N}_{A}}=\,\,6.02\times {{10}^{23}}\] find molecular weight of virus: [AIPMT 2001]
question_answer11) 1M and 2.5 litre NaOH solution mixed with another 0.5 M and 3 L NaOH solution. Then find out molarity of resultant solution. [AIPMT 2002]
question_answer14) In Haber process 30 L of dihydrogen and 30 L of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gaseous mixture under the aforesaid condition in the end? [AIPMT 2003]
question_answer16) Concentrated aqueous sulphuric acid is 98% \[{{H}_{2}}S{{O}_{4}}\] by mass and has a density of \[1.80\text{ }g\text{ }m{{L}^{-1}}.\] Volume of acid required to make one litre of 0.1 M \[{{H}_{2}}S{{O}_{4}}\] solution is: [AIPMT (S) 2007]
question_answer17) An element, X has the following isotopic composition; [AIPMT (S) 2007] \[^{200}X:90%\] \[^{199}X:8.0%\] \[^{202}X:2.0%\] The weighted average atomic mass of the naturally-occurring element X is closest to:
question_answer19) An organic compound contains carbon hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be [AIPMT (S) 2008]
question_answer21) 10 g of hydrogen and 64 of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be [AIPMT (S) 2009]
question_answer26) How many grams of concentrated nitric acid solution should be used to prepare 250 mL of \[\text{2}\text{.0}\,\text{M}\]\[HN{{O}_{3}}\]. The concentrated acid is 70% \[HN{{O}_{3}}\]. [NEET 2013]
question_answer28) When 22.4 L of \[{{H}_{2}}(g)\] is mixed with 11.2 L of \[C{{l}_{2}}\] each at STP, the moles of \[HCl(g)\] formed is equal to [AIPMT 2014]
question_answer29) *1.0 g of magnesium is burnt with 0.56 g \[{{O}_{2}}\] in a closed verssel. Which reactant is left in excess and how much? [AIPMT 2014] \[(At.wt.Mg=24;O=16)\]
question_answer30) If Avogadro number \[{{N}_{A}},\] is changed from \[6.022\times {{10}^{23}}mo{{l}^{-1}}\] to \[6.022\times {{10}^{20}}mo{{l}^{-1}}\] this would change [NEET 2015 (Re)]
A)
the definition of mass in units of grams
doneclear
B)
the mass of one mole of carbon
doneclear
C)
the ratio of chemical species to each other in a balanced equation
question_answer31) 20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (Atomic weight of Mg = 24) [NEET 2015 (Re)]