Class 11 chemistry | Some basic concept of Chemistry | IIT JEE | NEET

                         Class 11 chemistry | Some basic concept of Chemistry | IIT JEE | NEET 

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Students can find the Important Questions of Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry compiled here on this page. These questions cover all the important topics and are designed exclusively for students exam preparation.

Some Basic Concept of Chemistr -

MC Question 

1.      1.The result of the operation 2.5 x 1.25 should be which of the following on the basis of significant figures ?

(a)    3.125 

(b)   3.13

(c)    3.1

(d)   31.25

2.       2.What should be the volume of the milk ( in m³) which measures 5 L ?

(a)    5 x 10 ^-3 m³

(b)   5 x 10 ³ m³

(c)    5 x 10000 m³

(d)   5 x 10⁶ m³

3.     3.  what is the mass per cent of oxygen in ethanol ?

(a)    52.14%

(b)   13.13%

(c)    16%

(d)   34.73%

1.     4.  How much signification figures are present in 0.010100 x 10³?

(a)    7

(b)   5

(c)    3

(d)   10

2.       5.which of the following is the most accurate measurement ?

(a)    9 m

(b)   9.0 m

(c)    9.00m

(d)   9.000 m

3.       6.what volume of dioxygen is required for complete combustion of 2 volumes of acetylene gas at NTP ?

(a)    2 Volumes

(b)   5 Volumes

(c)    10 Volumes

(d)   4 Volumes

4.     7. How much mass of silver nitrate will react with 5.85 g of sodium chloride to produce 14.35 g of             silver chloride and 8.5 g of sodium nitrate if law of conservation of mass is followed?

(a)    22.85 g

(b)   108 g

(c)    17.0 g

(d)   28.70 g

5.     8.  The number of oxygen atoms present in 1 mole of oxalic acid dihydrate is .

(a)    6 x 10 ²³

(b)   6.022 x 10³⁴

(c)    7.22 x 10²³

(d)   36.13 x 10²³

6.       9.The density of a gas is 1.78 gL^-1 at STP. The weight of one mole of gas is .

(a)    39.9 g

(b)   22.4 g

(c)    3.56 g

(d)   29 g

1.       10.which of following gases will have least volume if 10g of each gas is taken at same temperature and pressure?

(a)    CO₂

(b)   N₂

(c)    CH₄

(d)   HCl

2.      11. Total number of atoms present in 34g of NH₃  is

(a)    4 x 10²³

(b)   4.8 x 10 ²¹

(c)    2 x 10²³

(d)   48 x 10²³

3.    12.   What will be the molality of the solution made by dissolving 10g of NaOH in 100 g of water ?

(a)    2.5 m

(b)   5 m

(c)    10m

(d)   1.25 m

4.       13.what volume of water is to be added to 100 cm³ of 0.5M NaOH solution to make it 0.1 M Solution ?

(a)    200 cm³

(b)   400 cm³

(c)    500 cm³

(d)   100 cm³

5.       14.A solution is made by dissolving 49g of H₂SO₄ in 250 mL of water. the molarity of the solution prepared is .

(a)    2M

(b)   1M

(c)    4M

(d)   5M

6.      15. How Much oxygen is required for complete combustion of 560 g of ethene?

(a)    6.4 g

(b)   1.92g

(c)    2.8 g

(d)   58 g

7.      16. A compound of magnesium contains 21.9% magnesium 27.8% phosphorus and 50.3% oxygen. What will be the simplest formula of the compound ?

(a)    Mg₂P₂O₇ 

(b)   MgPO₃

(c)    Mg₂P₂O₂

(d)   MgP₂O₂

 

 

   17.The empirical formula of a compound is CH₂O₂.What could be its molecular formula ?

              (a) C₂H₂O₂

                     (b) C₂H₂O­₄

                      (c) C₂H₄O₄

                     (d) CH₄O₄

 18. What will be the mass of 100 atoms of hydrogen ?

              (a) 100 g

              (b) 1.66 x 10^-22 g

              (c)  6.023 x 10²³ g

              (d)  100 x 6.023 x 10²³ g

 

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