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Hydrogen · Question 7

NEET (UG) 2019MCQEasy📈 Topic in 0% papers+4−1
1

The method used to remove temporary hardness of water is :

  1. Ion-exchange method
  2. Synthetic resins method
  3. Calgon’s method
  4. Clark’s method

Answer

(4) Clark’s method

Solution

As per NCERT, temporary hardness (due to bicarbonates of Ca and Mg) is removed by boiling or by Clark's method.

In Clark's method a calculated amount of lime is added:

Ca(HCO3)2 + Ca(OH)2 2CaCO3 + 2H2O

Mg(HCO3)2 + 2Ca(OH)2 2CaCO3 + Mg(OH)2 + 2H2O

Calgon's, ion-exchange and synthetic resin methods are used for permanent hardness (they also remove temporary hardness, but are not the specific method for it).

Answer: (4)

Out of syllabusNEET (UG) 2019

Keep practising — Hydrogen

2

Among CaH2, BeH2, BaH2, the order of ionic character is

  1. BeH2 < CaH2 < BaH2
  2. CaH2 < BeH2 < BaH2
  3. BeH2 < BaH2 < CaH2
  4. BaH2 < BeH2 < CaH2
Out of syllabusNEET 2018
3

Which of the following statements about hydrogen is incorrect?

  1. Hydronium ion, H3O+ exists freely in solution.
  2. Dihydrogen does not act as a reducing agent.
  3. Hydrogen has three isotopes of which tritium is the most common.
  4. Hydrogen never acts as cation in ionic salts.
Out of syllabusNEET 2016 (Phase 1)
4

(I) H2O2 + O3 H2O + 2O2 (II) H2O2 + Ag2O 2Ag + H2O + O2 Role of hydrogen peroxide in the above reactions is respectively

  1. oxidizing in (I) and reducing in (II)
  2. reducing in (I) and oxidizing in (II)
  3. reducing in (I) and (II)
  4. oxidizing in (I) and (II)
AIPMT 2014
5

Some statements about heavy water are given below: Which of the above statements are correct?

  1. (i) and (ii)
  2. (i), (ii) and (iii)
  3. (ii) and (iii)
  4. (i) and (iii)
Out of syllabusAIPMT 2010 (Mains)
6

Which one of the following molecular hydrides acts as a Lewis acid?

  1. NH3
  2. H2O
  3. B2H6
  4. CH4
AIPMT 2010 (Prelims)
7

The structure of H2O2 is

  1. spherical
  2. non-planar
  3. planar
  4. linear
Out of syllabusAIPMT 2003
8

The life span of atomic hydrogen is

  1. fraction of one second
  2. one year
  3. one hour
  4. one day
Out of syllabusAIPMT 2000

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