The s-Block Elements Test 11

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The s-Block Elements Test 11

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Weekly Quiz Competition

Question 1
1 / -0

Lithopone, a white pigment, is the mixture of:

A
$$BaSO_4$$ and $$ZnS$$

B
$$BaS$$ and $$ZnSO_4$$

C
$$CaSO_4$$ and $$ZnS$$

D
$$CaS$$ and $$ZnSO_4$$

Solution

Lithopone C.I. Pigment White 5 is a mixture of inorganic compounds which is widely used as a white pigment powder. It is composed of mixture of barium sulfate and zinc sulfide.
Question 2
1 / -0

Which of the following trace elements is present in virtually all potable water?

A
Lead

B
Sodium

C
Manganese

D
Mercury

Solution

There are a variety of trace elements present in virtually all potable water, some of which play a role in metabolism. For example, sodium, potassium and chloride are common chemicals found in small quantities in most waters, and these elements play a role in body metabolism.
Question 3
1 / -0

Which of the following metal does not react with water?

A
Beryllium

B
Copper

C
Iron

D
Potassium

Solution

Beryllium $$(Be)$$ is the only alkaline earth metal that does not react with water. This is due to its small size and high ionization energy in relation to the other elements in the group.
Question 4
1 / -0

The magnetic quantum number of the valence electron of sodium is:

A
$$2$$

B
$$3$$

C
$$1$$

D
$$0$$

Solution

Electronic configuration of $$Na$$ ( it has 11 electrons) is $$1s^2 2s^2 2p^6 3s^1$$.

Here the valence electron is in $$3s$$ orbitals ( $$3s^1$$). So, the orbital is s - orbital. The $$l$$ value (Azimuthal quantum number) of this $$s\ -$$ orbital is 0, so the magnetic quantum number will zero i.e. $$m$$ value is 0.
Question 5
1 / -0

Sodium on heating with moist air produces:

A
$$NaO$$

B
$$NaOH$$

C
$$Na_2O$$

D
$$Na_2CO_3$$

Solution

Sodium when exposed to air, the surface rapidly tarnishes, darkening at first and then forming a white coating of sodium hydroxide and sodium carbonate. It reacts exothermically with water, to the point that sufficiently large pieces melt to a sphere and may explode; this reaction produces sodium hydroxide and flammable hydrogen gas.

$$Na + H_2O \rightarrow NaOH + H_2O$$
Question 6
1 / -0

Which of the following alkaline earth metals do not give characteristic colour to the flame?

A
$$Be$$

B
$$Mg$$

C
$$Ca$$

D
Both A and B

Solution

Beryllium and Magnesium are the two elements which do not give a characteristic colour to the flame.
Question 7
1 / -0

Nitrolim is a mixture of :

A
$$CaC_2$$ and graphite

B
$$CaCN_2$$ and graphite

C
$$Ca(CN)_2$$ and graphite

D
$$CaCN_2+N_2$$

Solution

$$CaC_2 +N_2\longrightarrow CaCN_2 +C$$

When nitrogen is passed over calcium carbide at a suitable high temperature, we get a mixture of $$CaCN_2 + Graphite (C)$$ known as nitrolim which is a nitrogenous fertiliser."
Question 8
1 / -0

Potassium hydroxide is a good conductor of an electric current in the:

A
gaseous state only

B
molten (fused) state only

C
solid state only

D
solid and molten (fused) states

E
molten (fused) state and in aqueous solution

Solution

Option $$(E)$$ is correct.

Potassium hydroxide is a good conductor of an electric current in the molten (fused) state and in aqueous solution. When it is in solid state it cannot conduct electricity but it can conduct electricity in aqueous solution state or molten state. This is because it is an ionic compound. Ionic compounds are made of charged ions which are held tightly in solid state but become mobile in molten or aqueous solution state. The movement of these mobile ions between electrodes helps in conducting electricity.
Question 9
1 / -0

____________ were discovered by bombarding beryllium with alpha particles.

A
Neutrons

B
Protons

C
Electrons

D
None of these

Solution

Neutrons are discovered by bombarding berylium with alpha particals.
$$_2Be^4 +_2He^4 \rightarrow _6C^{12} + _0n^1$$
Question 10
1 / -0

Among the following which can form ions with a $$2+$$ charge?

A
Alkali metal

B
Alkaline earth metal

C
Transition metal

D
Halogen

E
Noble gas

Solution

Alkaline earth metals have 2 electron in their outermost orbital,after donating these two electron stable state can be achieved with fully occupied outermost orbital. so Alkaline earth metals can form ions with a 2+ charge.

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Re-Attempt Weekly Quiz Competition

The s-Block Elements Test 11

Result

The s-Block Elements Test 11

Score

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SHARING IS CARING

Question 1

$$BaSO_4$$ and $$ZnS$$

$$BaS$$ and $$ZnSO_4$$

$$CaSO_4$$ and $$ZnS$$

$$CaS$$ and $$ZnSO_4$$

Solution

Question 2

Lead

Sodium

Manganese

Mercury

Solution

Question 3

Beryllium

Copper

Iron

Potassium

Solution

Question 4

$$2$$

$$3$$

$$1$$

$$0$$

Solution

Question 5

$$NaO$$

$$NaOH$$

$$Na_2O$$

$$Na_2CO_3$$

Solution

Question 6

$$Be$$

$$Mg$$

$$Ca$$

Both A and B

Solution

Question 7

$$CaC_2$$ and graphite

$$CaCN_2$$ and graphite

$$Ca(CN)_2$$ and graphite

$$CaCN_2+N_2$$

Solution

Question 8

gaseous state only

molten (fused) state only

solid state only

solid and molten (fused) states

molten (fused) state and in aqueous solution

Solution

Question 9

Neutrons

Protons

Electrons

None of these

Solution

Question 10

Alkali metal

Alkaline earth metal

Transition metal

Halogen

Noble gas

Solution

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