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11th Chemistry Weekly Test - 3 ( Alkali and Alkaline Earth Metals )

MABS Institution

11th Chemistry Weekly Test - 3 ( Alkali and Alkaline Earth Metals )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

Consider the following statements.
(i) 99% of body calcium is present in bones and teeth
(ii) The calcium concentration in plasma is regulated at 10 mg L^-1.
(iii) Calcium plays an important role in neuromuscular function, interneuronal transmission and in blood coagulation.
Which of the above statements is/are not correct?

(i) only
(ii) only
(iii) only
(i), (ii) and (iii)

Assertion: Na₂SO₄ is soluble in water but BaSO₄ is insoluble
Reason : Lattice energy of barium sulphate exceeds its hydration energy.

Both assertion and reason are true and reason is the correct explanation for assertion
Both assertion and reason are true but reason is not the correct explanation for assertion
Assertion is true but reason are false
Both assertion and reason are false.

Match the list-I and list-II using the correct code given below the list

List-I List-II

A Lithium 1 Lilac

B Sodium 2 Reddish violet

C Potassium 3 Crimson red

D Rubidium 4 Yellow

A B C D

3 4 1 2
A B C D

4 3 2 1
A B C D

2 1 3 4
A B C D

1 2 4 3

The by-product of Solvay ammonia process is:

CO₂
NH₃
CaCl₂
CaCO₃

For alkali metals, which one of the following trends is incorrect?

Hydration energy: Li > Na > K > Rb
Ionisation energy: Li > Na > K > Rb
Density: Li < Na < K < Rb
Atomic size: Li < Na < K < Rb

Identify the most stable hydride among the following

NaH
LiH
KH
CsH

Gypsum is _________

CaSO₄.H₂O
CaSO₄.1/2H₂O
CaSO₄.1/4H₂O
CaSO₄.2H₂O

Which of the following is used in making armour plates?

Lithium + magnesium
Lithium + aluminium
Lithium + lead
Sodium + lithium

Which of the following salt is more soluble?

NaCIO₄
LiCIO₄
CsBr
Kl

Which one of the following gives green spark in fire works?

Magnesium chloride
Sodium chloride
Barium bromide
Potassium iodide

Which of the following is used as a coolant in fast breeder nuclear reactor?

Liquid ammonia
Liquid helium
Liquid Na metal
Solid CO₂

The element that does not answer the flame test is

Ba
Mg
Ca
Sr

The name 'Blue John' is given to which of the following compounds?

CaH₂
CaF₂
Ca₂(PO₄)₂
CaO

Which of the following statements is true about Ca(OH)₂?

It is used in the preparation of bleaching powder
It is a light blue solid
It does not possess distinfectant property.
It is used in the manufacture of cement

Which one of the following metal act as co-factor in phosphate transfer of ATP by enzymes?

Calcium
Beryllium
Magnesium
Sodium

Electronic configuration of 1s block of elements is ______

ns²
ns¹
ns²np¹
ns²np²

A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is ______

Magnesium nitrate
Calcium nitrate
Barium nitrate
Strontium nitrate

Assertion : Alkaline earth metals are harder than alkali metals
Reason : Atomic radii of alkaline earth metals are smaller than corresponding alkali metals "in the same periods of periodic table

Both assertion and reason are true and reason is the correct explanation for assertion.
Both assertion and reason are true but reason is not the correct explanation for assertion
Assertion is true but reason are false
Both assertion and reason are false

Alkaline earth metals belong to _____ group of the periodic table

1
2
17
18

Alkaline earth metals form basic hydroxides. The metal hydroxide which is most basic is _____

Mg(OH)₂
Ca(OH)₂
Sr(OH)₂
Ba(OH)₂

Which is the correct sequence of solubility of carbonates of alkaline earth metals?

BaCO₃ > SrCO₃ > CaCO₃ > MgCO₃
MgCO₃ > CaCO₃ > SrCO₃ > BaCO₃
CaCO₃ > BaCO₃ > SrCO₃ > BaCO₃
BaCO₃ > CaCO₃ > SrCO₃ > MaCO₃

Identify the correct statement

Gypsum is obtained by heating plaster of paris
Plaster of paris can be obtained by hydration of gypsum
Plaster of paris contains higher percentage of calcium than that of gypsum
Plaster of paris is obtained from gypsum by oxidation

Which is used in dehydrating oils?

Calcium
Magnesium
Beryllium
Radium

Correctly match the list-land list-II using the code given below the list.

List-I List-II

A Quick lime 1 Casts of statues

B Calcium hydroxide 2 Drying agent

C Gypsum 3 White washing

D Plaster of paris 4 Tooth paste

A B C D

2 3 4 1
A B C D

3 4 1 2
A B C D

1 3 2 4
A B C D

4 1 3 2

Assertion : BeSO₄ is soluble in water while BaSO₄ is not
Reason : Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.

both assertion and reason are true and reason is the correct explanation of assertion
both assertion and reason are true but reason is not the correct explanation of assertion
assertion is true but reason is false
both assertion and reason are false.

Which among the following alkali metals exhibit the most metallic character?

Na
Li
Cs
K

Which one of the following is covalent in character?

BeCl₂
MgCl₂
CaCl₂
BaCl₂

Which one of the following is called ornamental stone?

Alabaster
Plaster of paris
Limestone
Gypsum plaster

Which metal is used as radiation windows for X-ray tubes?

Magnesium
Sodium
Calcium
Beryllium

The reducing property of alkali metals follows the order

K < Rb < Cs < Li
K < Na < Rb < Cs < Li
Li < Cs < Rb < K < Na
Rb < Cs < K < Na < Li

In context with beryllium, which one of the following statements is incorrect?

It is rendered passive by nitric acid
It forms Be₂C
Its salts are rarely hydrolysed
Its hydride is electron deficient and polymeric

Alkaline earth metals are

Monovalent
Divalent
Trivalent
Zerovalent

Match the flame colours of the alkali and alkaline earth metal salts in the bunsen burner

(P) Sodium (1) Brick red

(q) Calcium (2) Yellow

(r) Barium (3) Violet

(s) Strontium (4) Apple green

(t) Cesium (5) Crimsonred

(u) Potassium (6) Blue

p-2, q-1, r-4, s-5, t-6, u-3
p-1, q-2, r-4, s-5, t-6, u-3
p-4, q-1, r-2, s-3, t-5, u-6
p-6, q-1, r-2, s-3, t-5, u-4

Name the alkaline earth metal hydroxide which is amphoteric is nature.

Be(OH)₂
KOH
NaOH
All of these

Assertion : Lithium is in diagonal relationship with magnesium
Reason : Li⁺ has same size as Mg²

Both assertion and reason are true and reason is the correct explanation for assertion.
Both assertion and reason are true but reason is not the correct explanation for assertion
Assertion is true but reason are false
Both assertion and reason are false.

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