Bottom of Pyramid - Test # 26

Hydrogen is evolved by the action of cold dilute HNO₃ on:
1. Fe
2. Mg or Mn
3. Cu
. Al

A molten ionic hydride on electrolysis gives:
1. H⁺ ion moving towards the cathode.
2. H⁺ ion moving towards the anode.
3. H₂ is liberated at anode.
4. H₂ is liberated at cathode.

Which statement is not correct for hydrogen peroxide?
1. Pure H₂O₂ is fairly stable
2. It sometimes acts as a reducing agent
3. It acts as an oxidising agent
4. Aqueous solution of H₂O₂ is weakly basic

In solid hydrogen, the intermolecular bonding is:
1. ionic
2. van der Waals'
3. metallic
4. covalent

The lightest gas is :
1. nitrogen
2. helium
3. oxygen
4. hydrogen

The critical temperature of water is higher than that of O₂ because H₂O molecule has:
1. fewer electrons than oxygen
2. two covalent bonds
3. V-shape
4. dipole moment

Benzene is oxidized by H₂O₂ in presence of FeSO₄ to:
1. phenol
2. cyclohexane
3. benzaldehyde
4. benzoic acid

The oxidizing property of H₂O₂ is best explained by assuming that two oxygen atoms in its molecule are:
1. bonded differently
2. bonded similarly
3. bonded covalently
4. bonded by hydrogen bonds

10 volumes of H₂O₂ has a strength of approximately:
1. 3%
2. 30%
3. 10%
4. 5%

10.

OXIDISINThe incorrect statement among the following regarding H₂O₂ is -
1. It can only act as an oxidising agent
2. It decomposes on exposure to light
3. It has to be stored in plastic or wax-lined glass bottles in dark
4. It has to be kept away from dust

11.

H₂O₂ turns an acidified solution of ........ to orange red.
1. BaO₂
2. PbO₂
3. Na₂O₂
4. TiO₂

12.

Which is not true in case of H₂O₂?
1. It is more stable in basic solution
2. It acts as strong oxidising agent in acid and basic solutions
3. It is decomposed by MnO₂
4. It behaves as reducing agent towards KMnO₄

13.

Decmposition of H₂O₂ is retarded by:
1. acetanilide
2. alcohol
3. H₃PO₄
4. all of these

14.

The incorrect statement among the following is-
1. Hardness of water depends upon its soap consuming power
2. Temporary hardness is due to bicarbonates of calcium and magnesium
3. Permanent hardness is due to soluble sulphates, chlorides and nitrates of Ca and Mg
4. Permanent hardness can be removed by boiling water

15.

Metal which does not react with cold water but evolves H₂ with steam is:
1. Na
2. K
3. Pt
4. Fe

16.

Permutit is:
1. hydrated sodium aluminium silicate
2. sodium hexa meta-phosphate
3. sodium silicate
4. sodium meta-aluminate

17.

Hydrogen is not obtained when zinc reacts with:
1. cold water
2. dil. H₂SO₄
3. dil HCl
4. hot 20% NaOH

18.

An industrial method of preparation of Hydrogen peroxide is -
1. Action of H₂SO₄ on barium peroxide
2. Action of H₂SO₄ on sodium peroxide
3. Auto-oxidation of 2-alkylanthraquinols.
4. Burning hydrogen in excess of oxygen

19.

Ionic hydrides are formed by:
1. Transition metals.
2. Elements of very high electropositivity.
3. Elements of very low electropositivity.
4. Metalloids.

20.

Very pure hydrogen (99.9%) can be made by which of the following processes ?
1. Mixing natural hydrocarbons of high molecular weight
2. Electrolysis of water
3. Reaction of salt like hydrides with water
4. Reaction of methane with steam

21.

Para hydrogen at room temperature is:
1. Less stable than ortho hydrogen.
2. More stable than ortho hydrogen.
3. As stable as ortho hydrogen.
4. None of the above.

22.

Hydrogen combines directly with:
1. Ca
2. Cu
3. Zn
4. Fe

23.

Acidified solution of chromic acid on treatement with H₂O₂ yields :
1. ${CrO}_{3} + H_{2} O + O_{2}$
2. ${Cr}_{2} O_{2} + H_{2} O + O_{2}$
3. ${CrO}_{5} + H_{2} O + K_{2} {SO}_{4}$
4. $H_{2} {Cr}_{2} O_{7} + H_{2} O + O_{2}$

24.

The ortho and para hydrogen possess:
1. same physical properties but different chemical properties
2. different physical properties but same chemical properties
3. same chemical and physical properties
4. different physical and chemical properties

25.

On bubbling CO₂ through a solution of barium peroxide in water:
1. O₂ is formed
2. H₂CO₃ is formed
3. H₂O₂ is formed
4. H₂ is formed

26.

A mixture of hydrazine and 60 to 90 percent of H₂O₂ solution is:
1. antiseptic
2. rocket fuel
3. germicide
4. insecticide

27.

A given solution of H₂O₂ is 30 volume. Its concentration in terms of molarity is:
1. 9.1 M
2. 2.68 M
3. 2.5 M
4. 26.8 M

28.

The decomposition of H₂O₂ is accelerated by:
1. traces of acids
2. finely divided metals
3. acetanilide
4. alcohol

29.

Hardness of water cannot be removed by -
1. Clark's method
2. Adding washing soda
3. Calgon process
4. Filtration

30.

At pH = X, $\text{CrO}_4^{2-}$ (yellow) changes to $\text{Cr}_2\text{O}_7^{2-}$ (orange), and vice versa at pH = Y.
What are the values of X and Y, respectively?
1. 6, and 8
2. 6, and 5
3. 8, and 6
4. 7, and 7

31.

In which reaction hydrogen is not formed ?
(1) Copper and hydrochloric acid
(2) Iron and sulphuric acid
(3) Magnesium and steam
(4) Sodium and alcohol

32.

Which conversion is not done by H₂O₂ ?
1. ${Fe}^{2 +} \overset{}{\to} {Fe}^{3 +}$ (acidic medium)
2. $PbS \overset{}{\to} {PbSO}_{4}$
3. ${Fe}^{+} \overset{}{\to} {Fe}^{3 +}$ (alkaline medium)
4. $KI \overset{}{\to} I_{2}$

33.

H₂O₂ restores the colour of old lead paintings by:
1. Converting PbO₂ to Pb
2. Oxidising PbS to PbSO₄
3. Converting PbCO₃ to Pb
4. Oxidizing PbSO₃ to PbSO₄

34.

(I) $H_{2} O_{2} + O_{3} \overset{}{\to} H_{2} O + 2 O_{2}$
(II) $H_{2} O_{2} + {Ag}_{2} O \overset{}{\to} 2 Ag + H_{2} O + O_{2}$
Role of hydrogen peroxide in the above reactions is respectively
1. oxidising in (I) and reducing in (II)
2. reducing in (I) and oxidising in (II)
3. reducing in (I) and (II)
4. oxidising in(I) and (II)

35.

In acidic medium, H₂O₂ changes ${Cr}_{2} O_{7}^{2 -}$ to CrO₅ which has two (-O-O-) bonds. Oxidation
state of Cr in CrO₅ is
1. +5
2. +3
3. +6
4. -10

36.

Nascent hydrogen consists of $-$
(1) Hydrogen atoms with excess energy
(2) Hydrogen molecules with excess energy
(3) Hydrogen ions in the excited state
(4) Solvated protons

37.

Maximum concentration of ortho- $H_{2}$ in ordinary hydrogen is:
(1) 75% ortho- $H_{2}$ + 25% para- $H_{2}$
(2) 25% ortho- $H_{2}$ + 75% para- $H_{2}$
(3) 50% ortho- $H_{2}$ + 50% para- $H_{2}$
(4) 99% para- $H_{2}$ + 1% ortho- $H_{2}$

38.

Acidified solution of $K_{2} {Cr}_{2} O_{7}$ on treatment with $H_{2} O_{2}$ gives $-$
(A) ${CrO}_{3} + H_{2} O + O_{2}$
(B) ${Cr}_{2} O_{3} + H_{2} O + O_{2}$
(C) ${CrO}_{5} + H_{2} O$
(D) $H_{2} {Cr}_{2} O_{7} + H_{2} O + O_{2}$

39.

Blackened oil planting can be restored into original form by the action of:
1. Chlorine
2. ${BaO}_{2}$
3. $H_{2} O_{2}$
4. ${MnO}_{2}$

40.

Which of the following statement regarding $H_{2} O_{2}$ is wrong.
(1) It is stable in acid medium
(2) It acts as oxidising as well as reducing agent
(3) It has zero dipole moment
(4) Pure $H_{2} O_{2}$ is slightly acidic

41.

$H_{2} O$ has higher boiling point than $H_{2} S$ because.
(1) $H_{2} O$ is a smaller molecule and hence more closely packed
(2) The bond angle in $H_{2} O$ is more than in $H_{2} S$ and hence the former molecules are more tightly packed
(3) Of intermolecular hydrogen bonding in liquid $H_{2} O$
(4) The latent heat of vaporisation is higher for $H_{2} O$ than for $H_{2} S$

42.

$H_{2} O_{2}$ acts as antiseptic due to its –
(1) Reducing property
(2) Oxidising property
(3) Bleaching property
(4) Acidic property

43.

A compound that has both polar and non-polar bonds is –
1. ${NH}_{4} Cl$
2. $HCN$
3. $H_{2} O_{2}$
4. ${CH}_{4}$

44.

Exhausted permutit does not contain ............ ion –
(A) ${Na}^{+}$
(B) ${Mg}^{2 +}$
(C) ${Al}^{3 +}$
(D) ${Si}^{4 +}$

45.

The best explanation for not placing hydrogen with the group of alkali metals or halogens is.
1. Hydrogen can form compounds with all other elements
2. Hydrogen is much lighter element than the alkali metals or the halogens
3. The IE of hydrogen is too high for group of alkali metals but too low for halogen group
4. None of these

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