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Some Basic Concepts of Chemistry · Question 29

AIPMT 2014MCQEasy📈 Topic in 38% papers+4−1
1

1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much ? (At. wt. Mg = 24, O = 16)

  1. Mg, 0.16 g
  2. O2, 0.16 g
  3. Mg, 0.44 g
  4. O2, 0.28 g

Answer

(1) Mg, 0.16 g

Solution

2Mg + O2 2MgO

48 g Mg reacts with 32 g O2.

Mg required for 0.56 g O2 = 4832 0.56 = 0.84 g

1.0 g Mg is present (more than 0.84 g), O2 is the limiting reagent and Mg is in excess.

Mg left = 1.0 - 0.84 = 0.16 g

Answer: (1)

AIPMT 2014

Keep practising — Some Basic Concepts of Chemistry

2

6.02 1020 molecules of urea are present in 100 mL of its solution. The concentration of solution is

  1. 0.001 M
  2. 0.1 M
  3. 0.02 M
  4. 0.01 M
NEET 2013
3

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3? The concentrated acid is 70\% HNO3.

  1. 70.0 g conc. HNO3
  2. 54.0 g conc. HNO3
  3. 45.0 g conc. HNO3
  4. 90.0 g conc. HNO3
NEET 2013
4

In an experiment it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO3, which of the following will be the formula of the chloride (X stands for the symbol of the element other than chlorine)

  1. X2Cl2
  2. XCl2
  3. XCl4
  4. X2Cl
NEET 2013 (Karnataka)
5

Which has the maximum number of molecules among the following ?

  1. 44 g CO2
  2. 48 g O3
  3. 8 g H2
  4. 64 g SO2
AIPMT 2011 (Mains)
6

The number of atoms in 0.1 mol of a triatomic gas is ( NA = 6.02 1023 mol-1)

  1. 6.026 1022
  2. 1.806 1023
  3. 3.600 1023
  4. 1.800 1022
AIPMT 2010 (Prelims)
7

25.3 g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+ and carbonate ions, CO32- are respectively (Molar mass of Na2CO3 = 106 g mol-1)

  1. 0.955 M and 1.910 M
  2. 1.910 M and 0.955 M
  3. 1.90 M and 1.910 M
  4. 0.477 M and 0.477 M
AIPMT 2010 (Prelims)
8

10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be

  1. 3 mol
  2. 4 mol
  3. 1 mol
  4. 2 mol
AIPMT 2009
9

What volume of oxygen gas (O2) measured at 0 C and 1 atm, is needed to burn completely 1 L of propane gas (C3H8) measured under the same conditions?

  1. 5 L
  2. 10 L
  3. 7 L
  4. 6 L
AIPMT 2008
10

How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?

  1. 0.011
  2. 0.029
  3. 0.044
  4. 0.333
AIPMT 2008
11

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

  1. CHO
  2. CH4O
  3. CH3O
  4. CH2O
AIPMT 2008

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