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11th Chemistry Weekly Test - 1 ( Alkali and Alkaline Earth Metals )

MABS Institution

11th Chemistry Weekly Test - 1 ( Alkali and Alkaline Earth Metals )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Which of the following has highest hydration energy

MgCl₂
CaCl₂
BaCl₂
SrCI₂

Alkaline earth metals are

Monovalent
Divalent
Trivalent
Zerovalent

The half life period of francium is ____________

21 days
21 years
2.1 minutes
21 minutes

Identify the correct statements about barium.
(i) It shows photoelectric effect
(ii) It is silvery white metal
(ill) It forms Ba(NO₃)₂ which is used in preparation of green tire

Both (i) and (iii)
(ii) and (iii)
Only (ii)
(i),(ii),(iii)

By adding gypsum to cement

setting time of cement becomes less
setting time Of cement increases
colour of cement becomes light
shining surface is obtained

Which of the following are the correct reasons for anomalous behaviour of lithium?

Exceptionally small size of its atom
Its high polarising power
Exceptionally low ionisation enthalpy
both a and b

The radioactive element of group 2 element is ______

Strontium
Radium
Beryllium
Francium

Which of the following ions are more responsible for transmission of nerve signal?

Li⁺
RB⁺
Cs⁺
K⁺

The element that does not answer the flame test is

Ba
Mg
Ca
Sr

Among the following pairs, which occurs in large amounts in sea water?

Li, Rb
Cs, Fr
Na, K
Be, He

Part - B

Generic 2 - Answer All Question

Mention the uses of lithium and its compounds.

Why alkali metals are soft and have low melting points?

Lithium forms monoxide with oxygen whereas sodium forms peroxide with oxygen. Why?
What is 'dead burnt plaster'? What is use?

What is bleaching powder? How is it prepared?

Part - C

Generic 3 - Answer All Question

Predict the product:
1. 2BeCl₂ + LiAIH₄ ⟶ ?
2. BeO + C + CI₂ ⟶ ?
3. Be + CI₂ ⟶

Why is the behaviour of beryllium is different from the other elements of the same group?

What is dead burnt plaster?

What happens when
(i) Sodium metal is dropped in water?
(ii) Sodium metal is heated in free supply of air?
(iii) Sodium peroxide dissolves in water?
Write balanced chemical equation for each of the following chemical reactions.
(i) Lithium metal with nitrogen gas
(ii) heating solid sodium bicarbonate
(iii) Rubidum with oxgen gas
(iv) solid potassium hydroxide with CO₂
(v) heating calcium carbonate
(vi) heating calcium with oxygen

Part - D

Generic 5 - Answer All Question

Give the uses of gypsum

Describe the method of electrolysis of brine solution?

Discus the similarities between beryllium and aluminium.

How are peroxides and superoxides formed by alkali metals?
Explain in what respects lithium is different from other metals of the same group.

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