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Zinc II Oxide

Zinc II Oxide

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Q. Question 46.
A dry pellet of a common base B, when kept in open absorbs moisture and turns sticky. The compound is also a by-product of chlor-alkali process. Identify B, what type of reaction occurs when B is treated with an acidic oxide ? Write a balanced chemical equation for one such solution.

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Q. Which of the following hydroxides is amphoteric in nature?

Be(OH)₂
Ca(OH)₂
Mg(OH)₂
Ba(OH)₂

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Q. Question 49(e)
An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.

Locate the position of the element in the Modern Periodic Table.

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Q.

Fill in the blank:
$K_{2} C O_{3} + H C l \to$ ___________

$K C l + H_{2} O + C$
$K C l + H_{2} O + C O_{2}$
$K_{2} O + H_{2} O + C l_{2} + C O_{2}$
$K C l + H_{2} + C O_{2}$

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Q. A green pigment is obtained when zinc oxide is heated with cobalt nitrate. This pigment is called the Rinmann’s green. Rinmann’s green is given by?

$C o Z n O_{2}$
$C o Z n O_{3}$
$C o O . Z n O_{2}$
CoO.ZnO

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Q. Gas liberated when zinc is treated with concentrated nitric acid is :

nitrous oxide
nitric oxide
nitrogen dioxide
nitrogen

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Q. In the following reactions, ZnO is respectively acting as a/an:

(a) Z n O + N a_{2} O \to N a_{2} Z n O_{2}

(b) Z n O + C O_{2} \to Z n C O_{3}

base and acid
base and base
acid and acid
acid and base

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Q. Red precipitate is formed when acetylene passes through ammonical cuprous chloride solutions is:

$C_{2} H_{2}$
$C_{2} H_{6}$
$C_{2} H_{4}$
$C H_{4}$

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Q.

64 g

of a mixture of

N a C l

and

K C l

were treated with concentrated sulphuric acid. The total mass of metal sulphates obtained was found to be %

76 g

. What are the mass percents of

N a C l

in the mixture. The reactions are

2 N a C l + H_{2} S O_{4} \to N a_{2} S O_{4} + 2 H C l

;

2 K C l + H_{2} S O_{4} \to K_{2} S O_{4} + 2 H C l

;

$42.89 %$
$84.9 %$
$31.5 %$
$63.1 %$

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Q. In the following reactions, ZnO is respectively acting as a/an:

(a) Z n O + N a_{2} O \to N a_{2} Z n O_{2}

(b) Z n O + C O_{2} \to Z n C O_{3}

base and acid
base and base
acid and acid
acid and base

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Q. The reaction of zinc with dilute and concentrated nitric acid, respectively, produces:

$N O_{2}$ and $N O$
$N O$ and $N O_{2}$
$N O_{2}$ and $N_{2} O$
$N_{2} O$ and $N O_{2}$

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