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JEE Main Chemistry · Some Basic Concepts of Chemistry · Set 7 (Q181-210)

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  1. 181.
    For a given unbalanced reaction,
    , which is the limiting reagent, if the initial amount for each of the reactant is 100 grams?
    [Molar masses :
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  2. 182.
    The oxidation state of Cr in is:
    1. (1)+ 3
    2. (2)+ 2
    3. (3)+ 1
    4. (4)0
  3. 183.
    A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is
    1. (1)168
    2. (2)192
    3. (3)188
    4. (4)182
  4. 184.
    5 moles of weigh kg and 10 moles of weigh kg. The molar mass of A and molar mass B in kg are :
    1. (1)and
    2. (2)and
    3. (3)and
    4. (4)and
  5. 185.
    Combustion of glucose produces and water. The amount of oxygen (in required for the complete combustion of of glucose is : [Molar mass of glucose in ]
    1. (1)480
    2. (2)800
    3. (3)960
    4. (4)32
  6. 186.
    The number of moles of oxygen in one litre of air containing 21% oxygen by volume, under standard conditions, is
    1. (1)0.0093 mol
    2. (2)2.10 mol
    3. (3)0.186 mol
    4. (4)0.21
  7. 187.
    The number of gram molecules of oxygen in 6.02 CO molecules is
    1. (1)10 molecules
    2. (2)5 molecules
    3. (3)1 molecules
    4. (4)0.5 molecules.
  8. 188.
    The density of a solution prepared by dissolving 120 g of urea (mol. mass = 60 u) in 1000 g of water is 1.15 g/mL. The molarity of this solution is:
    1. (1)0.50 M
    2. (2)1.78 M
    3. (3)1.02 M
    4. (4)2.05 M
  9. 189.
    Dissolving 120 g of a compound of (mol. wt. 60) in 1000 g of water gave a solution of density 1.12 g/mL. The molarity of the solution is:
    1. (1)1.00 M
    2. (2)2.00 M
    3. (3)2.50 M
    4. (4)4.00 M
  10. 190.
    The correctly reported answer of the area of rectangle which is 12.34 cm long and 1.23 cm wide is :
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  11. 191.
    How many different scientific notations may be written for the result 10500 g?
    1. (1)Four
    2. (2)Three
    3. (3)Five
    4. (4)Two
  12. 192.
    How many electrons are involved in the following redox reaction?
    O + + O → + + (unblanced)
    1. (1)3
    2. (2)4
    3. (3)6
    4. (4)5
  13. 193.
    5 L of an alkane requires 25 L of oxygen for its complete combustion. If all volumes are measured at constant temperature and pressure, the alkane is:
    1. (1)Butane
    2. (2)Isobutane
    3. (3)Ethane
    4. (4)Propane
  14. 194.
    When 22.4 L of is mixed with of , each at STP, the moles of formed is equal to
    1. (1)1 mole of
    2. (2)2 moles of
    3. (3)0.5 mole of
    4. (4)1.5 moles of
  15. 195.
    Aqueous HCl reacts with to form and . What is the weight (in g) of liberated when 8.7 g of is reacted with excess aqueous HCl solution? (Given Molar mass in )
    1. (1)21.3
    2. (2)71
    3. (3)14.2
    4. (4)7.1
  16. 196.
    The minimum amount of consumed per gram of reactant is for the reaction :(Given atomic mass : Fe = 56, O=16, Mg = 24, P =31, C = 12, H = 1)
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  17. 197.
    A pure compound contains of , atoms of moles of oxygen atoms. Its empirical formula is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  18. 198.
    A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 ml of at T = 298.15 K and p = 1 bar. If molar volume of is 25.0 L under such condition, what is the percentage of sodium bicarbonate in each tablet? [Molar mass of = 84 g ]
    1. (1)0.84
    2. (2)33.6
    3. (3)16.8
    4. (4)8.4
  19. 199.
    The formula of a metal oxide is . The fractions of metal that exists as and ions in that oxide are respectively
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  20. 200.
    Express the result of to the appropriate number of significant figures:
    1. (1)325.24
    2. (2)325.23
    3. (3)325.2
    4. (4)325.232
  21. 201.
    The formula of nickel oxide is . What is the approximate percentage of in it?
    1. (1)92
    2. (2)94
    3. (3)96
    4. (4)98
  22. 202.
    25 mL of silver nitrate solution (1M) is added dropwise to 25 mL of potassium iodide (1. 05 M) solution. The ion(s) present in very small quantity in the solution is/are
    1. (1) only
    2. (2) only
    3. (3) only
    4. (4) and both
  23. 203.
    One litre of aqueous solution is mixed with of aqueous solution in acid medium. What is the number of moles of remaining in the solution after the reaction?
    1. (1)0.1
    2. (2)0.0125
    3. (3)0.025
    4. (4)0.05
  24. 204.
    Calculate the percent atom economy when a product of formula weight is obtained in a chemical reaction using formula weight reactant.
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  25. 205.
    The pair of compounds having metals in their highest oxidation state is:
    1. (1) and
    2. (2) and
    3. (3)[Fe(CN)] and [Cu(CN)]
    4. (4) and
  26. 206.
    What amount of dioxygen (in gram) contains molecules?
    1. (1)0.960
    2. (2)96.0
    3. (3)0.0960
    4. (4)9.60
  27. 207.
    Consider the following reaction:

    If of is mixed with of , then amount of formed is________ mmol. (nearest integer)
  28. 208.
    An aqueous KCl solution of density 1.20 g has a molality of 3.30 mol . The molarity of the solution in mol is ____. (Nearest integer)
    [Molar mass KCl = 74.5]
  29. 209.
    0.5 g of an organic compound (X) with 60% carbon will produce x g of on complete combustion.
  30. 210.
    29.2% (w/w) HCl stock solution has a density of 1.25 g . The molecular weight of HCl is 36.5 g . The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is