NEET Chemistry Chapter Wise Mock Test – Hydrogen
Which pair does not show hydrogen isotopes?
(a) Ortho hydrogen and para hydrogen
(b) Protium and deuterium
(c) Deuterium and tritium
(d) Tritium and protium
Hydrogen is not obtained when zinc reacts with
(a) dil. HCI
(b) hot NaOH solution
(c) cold water
(d) cone. H2S04
Hydrogen can be prepared by the action of dil. H2S04 on
Hydrogen gas is not liberated when the following metal is added to dil. HCI.
Very pure hydrogen (99.9) can be made by which of the following processes?
(a) Reaction of methane with steam
(b) Mixing natural hydrocarbons of high molecular weight
(c) Electrolysis of water
(d) Reaction of salts like hydrides with water
The adsorption of hydrogen by metals is called
When electric current is passed through an ionic hydride in the molten state
(a) hydrogen is liberated at the cathode
(b) hydrogen is liberated at the anode
(c) no reaction takes place
(d) hydride ion migrates towards cathode
An element reacts with hydrogen to form a compound A which on treatment with water liberates hydrogen gas.The element can be
Elements of which of the following group(s) of periodic table do not form hydrides?
(a) Groups 7, 8, 9
(b) Group 13
(c) Groups 15, 16, 17
(d) Group 17
Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is
(a) LiH > NaH > CsH > KH > RbH
(b) LiH < NaH < KH < RbH < CsH
(c) RbH > CsH > NaH > KH > LiH
(d) NaH > CsH > RbH > LiH > KH
Saline hydrides are known to react with water violently producing fire. The fire cannot be extinguished by CO2 because
(a) C02 is lighter than the gas evolved
(b) C02 is heavier than the gas evolved
(c) C02 gets reduced by the evolved gas
(d) C02 gets oxidised by the evolved gas
The increasing order of reducing property of NaH,MgH2 and H20 is
(a) NaH < H20 < MgH2
(b) MgH2 < H20 < NaH
(c) H20 < MgH2 < NaH
(d) NaH < MgH2 < H20
Which of the following statements do not define the characteristic property of water.“Water is a universal solvent”?
(a) It has high liquid range
(b) It has very low dielectric constant
(c) It can dissolve maximum number of compounds
(d) None of the above
The critical temperature of water is higher than 02 because H20 molecules have
(a) fewer electrons than oxygen
(b) two covalent bonds
(c) dipole moment
If same mass of liquid water and a piece of ice is taken, then why is the density of ice less than that of liquid water?
(a) Because ice is a solid
(b) Because molecules of ice are closely packed
(c) Because vacant spaces are present in the crystal lattice
(d) The given statement is wrong
The hardness of water is estimated by
(a) EDTA method
(b) titrimetric method
(c) conductivity method
(d) distillation method
Which of the following is not true?
(a) D20 freezes at lower temperature than H2O
(b) Reaction between H2 and Cl2 is much faster than D2 andCI2
(c) Ordinary water lectrolysed more rapidly than D20
(d) Bond dissociation energy is greater thanH2
Phosphoric acid is preferred over sulphuric acid in preparing hydrogen peroxide from peroxides because
(a) H2S02 acts as a reducing agent
(b) H2S02 gives BaS02 which is difficult to separate
(c) H2S02 act as catalyst
(d) Both (b) and (c)
There is a sample of 10 volume of hydrogen peroxide solution. Calculate its strength.
Direction (Q. NOS. 31-32) In the following questions more than one of the answers given may be correct. Select the correct answers and mark it according to the codes.
(a) 1, 2 and 3 are correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct
Hydrogen can be obtained from water, by the action of water on
(b) calcium hydride
(c) calcium oxide
Heavy water is used as
(d) fuel rods
Direction (Q. NOS. 34-37) Each of these questions contains two statements : Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below
(a) Assertion is true, Reason is true; Reason is the correct explanation for Assertion
(b) Assertion is true, Reason is true; Reason is not the correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is false
Assertion Water in liquid state is more stable than ice at room temperature.
Reason Water in liquid form has higher entropy than ice.
Assertion Water has high boiling point.
Reason Water shows hydrogen bonding.
Assertion Hard water is more suitable than soft water.
Reason Hard water can be used in steam boilers.
Assertion H202 undergoes disproportionation on heating.
Reason It gives HgO and 02 on heating.
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