Chemistry Test 32

Result

Chemistry Test 32

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Weekly Quiz Competition

Question 1
4 / -1

Which type of linkage is present in starch ?

A
C₁ – C₄ glucosidic linkage

B
C₁ – C₆ glucosidic linkage

C
both (a) and (b)

D
amide linkage

Solution

C₁ – C₄ glucosidic linkage is present in linear chain whereas C₁- C₆glucosidic linkage is present in branching.
Question 2
4 / -1

The arsenious sulphide sol has negative charge. The maximum coagulating power for precipitating is of:

A
0.1N Zn(NO₃)

B
0.1 N Na₃PO₄

C
0.1 N ZnSO₄

D
.1 N AlCl₃

Solution

Greater is the charge of the coagulating ion, more is the coagulating power. Here, since the sol is negatively charged, we need to check the charge of the positive ions. Out of the given options,

the charge of the ions are

1. Zn - +1

2. Na - +1

3. Zn - +2

4. Al - +3

Hence the correct answer is 0.1 N AlCl₃
Question 3
4 / -1

Which of the following group of transition metals is called coinage metals?

A
Cu, Ag, Au

B
Ru, Rh, Pd

C
Fe, Co, Ni

D
Os, Ir, Pt

Solution

Cu, Ag, Au group of elements are called coinage metals as these are used in minting coins.
Hence, option A is correct.
Question 4
4 / -1

Alkyl halides react with dialkyl copper reagents to give

A
alkenes

B
alkyl copper halides

C
alkanes

D
alkenyl halides

Solution

R₂CuLi + R'X → R-R' + R-Cu + LiX
Hence, option C is correct.