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NEET Previous Year Chemistry Questions Chapter – Hydrogen

1. One would expect proton to have very large                                     (1993)

(a) Charge

(b) Ionization potential

(c) Hydration energy

(d) Radius.  

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2. The ionization of hydrogen atom would give rise to                          (1990)

(a) Hydride ion

(b) Hydronium ion

(c) Proton

(d) Hydroxyl ion

3. Which one of the following pairs of substances on reaction will not evolve H2 gas?    (1998)

(a) Copper and HCl (aqueous)

(b) Iron and steam

(c) Iron and H2SO4 (aqueous)

(d) Sodium and ethyl alcohol

4. Water gas is produced by                                                                  (1992)

(a) Passing steam through a red hot coke

(b) Saturating hydrogen with moisture

(c) Mixing oxygen and hydrogen in the ratio of 1 : 2

(d) Heating a mixture of CO2 and CH4 in petroleum Refineries.

5. Which of the following metal evolves hydrogen on Reacting with cold dilute HNO3?   (1989)

(a) Mg                (b) Al

(c) Fe                  (d) Cu

6. Which of the following statements about hydrogen is incorrect?                  (NEET-I 2016)

(a) Hydronium ion, H3O+ exists freely in solution.

(b) Dihydrogen does not act as a reducing agent

(c) Hydrogen has three isotopes of which tritium is the most common.

(d) Hydrogen never acts as cation in ionic salts

7. Which of the following is electron-deficient?                          (NEET-I 2013)

(a) (BH3)2        (b) PH3

(c) (CH3)2       (d) (SiH3)2

8. The method used to remove temporary hardness of water is    (NEET 2019)

(a) Synthetic resins method                  (b) Colon’s method

(c) Clark’s method                               (d) ion-exchange method.

9. The number of hydrogen bonded water molecule(s) associated with CuSO4. 5H2O is (NEET 2019)

(a) 3                    (b) 1

(c) 2                   (d) 5

10. Which of the following groups of ions makes the water hard?   (1994)

(a) Sodium and bicarbonate

(b) Magnesium and chloride

(c) Potassium and sulphate

(d) Ammonium and chloride

11. At its melting point, ice is lighter than water because                       (1992)

(a) H2O molecules are more closely packed in solid state

(b) ice crystals have hollow hexagonal arrangement of H2O molecules

(c) on melting of ice the H2O molecules shrinks in size

(d) ice forms mostly heavy water on first melting.             (B)

12. Match the following and identify the correct option.              (NEET 2020)

(A) CO(g) + H2(g)                                       (i) Mg(HCO3)2 +Ca(HCO3)2

(B) Temporary hardness of water    (ii) An electron deficient hydride

(C) B2H6                                          (iii) Synthesis gas

(D) H2O2                                          (iv) Non planar structure   

      (A)    (B)    (C)    (D)

(a) (iii)    (i)    (ii)     (iv)

(b) (iii)   (ii)    (i)     (iv)

(c) (iii)   (iv)    (ii)    (i)

(d) (i)   (iii)     (ii)    (iv)  

13. The structure of H2O2 is                                                        (2003)

(a) Spherical             (b) non-planar

(c) Planar                 (d) linear.

19. Some statements about heavy water are given below.            (Mains 2010)

(i) Heavy water is used as a moderator in nuclear reactors.

(ii) Heavy water is more associated than ordinary water.

(iii) Heavy water is more effective solvent than ordinary water.

Which of the above statements are correct?

(a) (i) and (ii)               (b) (i), (ii) and (iii)

(c) (ii) and (iii)              (d) (i) and (iii)         

20. Tritium, a radioactive isotope of hydrogen, emits which of the following particles ? (2021)

(a) Beta(β)

(b) Alpha (α)

(c) Gamma (γ)

(d) Neutron (n)

Answer Key

1. (c)      2.(c)      3. (a)      4. (a)       5. (a)       6. (b,c)       7. (a)        8. (c)       9. (b)       10. (b)     11. (b)    12. (a)     13. (b)     19. (a)     20. (a)

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