RRB GROUP D Chemistry Quiz

Question 1:

A compound X used in cement industry .Name the substance X and its reaction with water is of which type ?

X- CaO , combination reaction

X- Ca(OH)2 , Decomposition reaction

X- CaO , Double displacement reaction

X- Ca(OH)2 , Displacement reaction

Question 2:

Which one of the following is electron deficient compound?

BH₃

CH₄

C₂H₆

C₂H₄

Question 3:

Which one of the following is the best example of desiccant?

Silica gel

Polystyrene

Sodium chloride

Sodium carbonate

Question 4:

Number of core electron present in [Ne]3s¹ is

1

10

8

11

Question 5:

The oxidation state of $\mathrm{Cr}$ in $\mathrm{Cr}(\mathrm{CO})_{6}$ and of $\mathrm{Mn}$ in $\mathrm{KMnO}_{4}$ is

5,3

2,8

0,7

Question 6:

If the valency of carbon is 4 and chlorine is 1, then the chemical formula of calcium tetrachloride is-

CCl₄

CCl₃

C₄Cl

CCl₂

Question 7:

Precipitation reaction takes place

when the concentration of dissolved ions in the solution less than solubility product.

when the concentration of dissolved ions in the solution equal to solubility product.

when the concentration of dissolved ions in the solution exceeds solubility product.

Both 1 and 2

Question 8:

Th-90 belongs to which block in periodic table?

S

P

D

F

Question 9:

Silver bromide is stored in dark bottles because

It undergo oxidation in presence of light

It undergo decomposition in presence of light

It undergo reduction in absence of light

It is highly reactive in presence of light

Question 10:

Which of the following is easily soluble in water?

Carbon

Nitrogen

Sulphur

Ammonia

RRB GROUP D Chemistry Quiz - 67

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RRB GROUP D Chemistry Quiz - 67

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