IGCSE Chemistry: Specimen Questions with Answers 207 - 208 of 240

Doorsteptutor material for Bank-PO is prepared by world's top subject experts: get questions, notes, tests, video lectures and more- for all subjects of Bank-PO.

Question 207

Edit

Write in Short

Short Answer▾

Water reacts with sodium. The products are sodium hydroxide and hydrogen. Write a word equation for this reaction

Explanation

Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide and hydrogen gas . The reaction is exothermic. The reaction is given below.

Image Exothermic A
Image Exothermic D
Image Exothermic C
Image Exothermic B

Question 208

Question

MCQ▾

Pickles can be used for months because it՚s manufactured through a process called ‘pickling’ . In the process we use an ingredient which is a mild solution of acetic acid.

The name of the ingredient is ________.

Choices

Choice (4)

a.

Vinegar

b.

Hydrochloric acid

c.

Nitric acid

d.

Sulphuric acid

Answer

a.

Explanation

Vinegar can kill bacterias as it՚s of acidic nature.

Vinegar is dilute solution of acetic acid . Because of being an acid Vinegar is mainly used as a cooking ingredient, or in pickling. As the most easily manufactured mild acid, it has historically had a great variety of industrial, medical, and domestic uses, some of which (such as its use as a general household cleaner) are still commonly practiced today.

Developed by: