The common name of sodium hydroxide is: MCQ with Answer and Explanation

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The common name of sodium hydroxide is:

A. Washing soda

B. Soda ash

C. Baking soda

D. Caustic soda

Answer: Option D

Solution (By JKSSB Mock Tests)

NaOH is caustic soda. Washing soda is Na₂CO₃·10H₂O; baking soda NaHCO₃; soda ash anhydrous Na₂CO₃.

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Question #1

The oxidation state of Cr in potassium dichromate (K2Cr2O7) is:

A. +7

B. +3

C. +2

D. +6

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Correct Answer: Option D

Explanation:
In K2Cr2O7, potassium has an oxidation state of +1 and oxygen is -2. Let the oxidation state of Cr be x. The sum of oxidation states in a neutral molecule is zero: 2(+1) + 2(x) + 7(-2) = 0. Solving this gives 2 + 2x - 14 = 0, so 2x = 12, and x = +6.

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Question #2

Which enzyme converts glucose into ethanol?

A. Zymase

B. Maltase

C. Invertase

D. Urease

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Correct Answer: Option A

Explanation:
Zymase, a complex of enzymes from yeast, catalyzes fermentation: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂. Invertase hydrolyzes sucrose; urease hydrolyzes urea; maltase converts maltose to glucose.

This question belongs to: Science chemistry

Question #3

The combined gas law is represented by:

A. PV = nRT

B. V/T = constant

C. PV = constant

D. P₁V₁/T₁ = P₂V₂/T₂

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Correct Answer: Option D

Explanation:
Combined gas law combines Boyle's, Charles', and Gay-Lussac's laws for a fixed mass of gas. It relates P, V, T when all change. PV=nRT is ideal gas equation for n moles.

This question belongs to: Science chemistry

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