X SCIENCE TEST ACID,BASE & SALT AND MAGNETIC EFFECT OF ELECTRICITY

1.       [1]Draw a sketch to show the magnetic lines of force due to a bar magnet

2.       [3]Give three properties of the magnetic lines of force.

3.       [2]Draw a sketch to show the magnetic lines of force due to a current carrying straight conductor.

4.       [3]In a statement of Fleming’s left-hand rule, what do the following represent?

        (a) direction of the centre finger              (b) direction of forefinger (c) direction of thumb.

5.       [3]Compounds like alcohol and glucose also contain hydrogen but are not characterized as acids. Describe an activity to prove it.

6.       [3]What is meant by water of crystallisation in a substance? How would you show that blue copper sulphate crystals contain water of crystallisation?

7.       [1]Anhydrous hydrogen chloride is not an acid but its aqueous solution is a strong acid. Explain.

8.       [3]Write following reactions

(a)                An acid with Metal Carbonate

(b)                An acid with Metal bi-carbonate

(c)                How to identify the gas evolved by above reactions. Write equation.

9.       [4]Write about followings:

(a)                Do metals reacts with base to evolve hydrogen gas. If yes write reaction.

(b)                What is hydronium ion ?

(c)                Do basic solutions also have H+(aq) ions? If yes, then are these basic?

(d)                What is neutralization reaction? Give two examples.

10.    [1]What is hydrogen ion and hydroxyl ion concentration in pure water?

11.    [2]Define pH .What is the range of pH scale ?

12.    [2]Two samples of Hydrochloric acid and Acetic acid of same concentration (i.e. one molar ) are taken . Which out of the two is strong and why?

13.    [1]What is an alkali? Give examples.

14.    [4]What happens when: (Support your answer with balanced chemical equations).

(i). Dilute hydrochloric acid reacts with sodium metal.

(ii).       Sodium carbonate is treated with dilute sulphuric acid.

(iii).     Zinc metal reacts with caustic soda.

(iv).     Carbon-di-oxide gas is passed through calcium hydroxide.

1.       Solutions A, B, C and D have pH 2, 3, 7 and 12. Which of these has the highest strength?     

(a)  A             (b) B                                       (c) C                    (d) D

2.       On electrolysis of brine solution, the gas liberated at cathode is                                    

(a) Oxygen         (b) Hydrogen     (c) Chlorine                 (d) None of these-

3.       Calcium oxide on reacting with sulphuric acid will form a salt which is                          

(a) Basic                                        (b) Acidic              (c) Neutral               (d) Amphoteric.

4.       The chemical formula of Plaster of Paris is                                                        

(a) CaSO₄. 2H₂O       (b) CaSO₄. 1/2H₂O          (c) (CaSO₄)₂. 3H₂O           (d) CaSO₄ .H₂O

5.       Few drops of methyl orange are added to soap solution taken in a test tube. The colour of the solution changes to                                                                                                 

(a) Pink                   (b) Yellow            (c) Red                (d) Remains orange.

6.       Which of the following will not produce H⁺ ions in aqueous solution?

(a)  HCl               (b) CH₃COOH                   (c) C₂H₅OH                        (d) H₂CO₃

7.       Acid formed in the stomach that helps in digestion is a dilute solution of

(a) H₂SO₄         (b) HNO₃                           (c) HCl                                (d) CH₃COOH.

8.       Acid present in Nettle sting is

(a) Citric acid               (b) Oxalic acid  (c) Methanoic acid                (d) Formic acid.