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M P Keshari

Posts Tagged ‘Question Bank’

SCIENCE – X

This item was filled under [ CBSE X ]

SCIENCE –  X   OBJECTIVE TYPE QUESTION   MULTIPLE CHOICE   Q.1.    The lowest value of pH is given by :   (a) 1M NaOH                                                              (b) 1M HCl   (c) 0.05M NaOH                                                         (d) 0,05M H2SO4   Q.2.    Choose the slow reaction from :  

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SCIENCE – X

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SCIENCE – X   OBJECTIVE  TYPE QUESTION   MULTIPLE CHOICE   Q.1.    The highest pH (14) is given by :   (a) 1M NaOH                                                              (b) 1M HCl   (c) 0.5M H2SO4 (d) 0.5M HCl   Q.2.    Rate of reaction depends upon :  

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SCIENCE – X

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SCIENCE – X   OBJECTIVE TYPE QUESTION   MULTIPLE CHOICE   Q.1.    pH of a substance is :   (a) log[OH-]                                                     (b) –log[H+]   (c) log[H+]                                                       (d) –log[OH-]   Q.2.     H+ ion concentration of a solution is 10-5, its pH is :  

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SCIENCE – X

This item was filled under [ CBSE X ]

SCIENCE – X   OBJECTIVE TYPE QUESTION   MULTIPLE CHOICE   Q.1.    Acids transfer the proton to other molecules, according to :   (a) Bronsted and Lowry                                             (b) Lewis   (c) Arhenius                                                                (d) Ostwald   Q. 2.    pH of a neutral solution is :  

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SCIENCE – X

This item was filled under [ CBSE X ]

SCIENCE – X   OBJECTIVE TYPE QUESTION   MULTIPLE CHOICE   Q. 1.    [H+] of a solution is 10 – 9,  its pH is :   (a) – 9                          (b)  9                            (c)  10                          (d) – 1   Q. 2.    Equilibrium in a chemical reaction is said to have been established when the [...]

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Science – IX

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Chemistry – IX – CBSE STRUCTURE OF THE ATOM Important Questions Q. 1. How can you say that matter is electrical in nature ? Ans.:- (i) By rubbing ebonite rod with cat skin we see that ebonite rod is negatively charged and cat’s skin is positively charged. (ii) A glass rod gets a positive charge [...]

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Science – IX

This item was filled under [ CBSE - IX ]

Chemistry – IX – CBSE STRUCTURE OF THE ATOM Important Questions Q. 36. State the model of an atom proposed by J. J. Thomson. Ans.:-               fig.4.5/ p. 104. J. J. Thomson proposed that : (i) An atom contains positively charged sphere embedded in it like seeds embedded in watermelon. (ii) The negative and positive charges [...]

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Science – IX

This item was filled under [ CBSE - IX ]

Chemistry – IX – CBSE STRUCTURE OF ATOM Important Questions. Q. 78. How are the electrons arranged outside the nucleus ? Ans.:- Bohr and Bury stated the following rules for the distribution of electrons around the nucleus : (i) Electrons are revolving around the nucleus in different orbits or shells. These shells are called energy [...]

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Science – IX

This item was filled under [ CBSE - IX ]

Chemistry – IX – CBSE STRUCTURE OF ATOMS Important questions :- Q. 90. What are valence electrons ? Explain with examples. Ans.:-  Valence electron is the number of electrons present in the outermost orbit of an atom . Examples : Elements Atomic number Electronic configuration Valence electron Boron 5 2, 3 3 Oxygen 8 2, [...]

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Science – IX

This item was filled under [ CBSE - IX ]

Chemistry – IX – CBSE Structure of atom Important questions : Q. 97. What is atomic number ? How the definition of an element is improved by this concept ? Ans.:- The number of protons present in the nucleus of an atom is equal to the atomic number of an element. As the atom as [...]

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