Chemical reactions and equations

The process by which new substances are formed from one or more substances is known as

• Chemical reaction

• Chemical change

• Physical reaction

• physical change

Swasti heats Lead Nitrate crystals in a beaker to get Lead oxide and fumes of _____along with oxygen

• Lead nitrite

• Nitrogen trioxide

• Nitrogen dioxide

• Nitrogen dioximide

Decomposition of vegetable matter into compost is an/a:

• endothermic

• exothermic

• Can be either, depends on the situation

• data insufficient

Ca(OH)₂ stands for _________

• Calcium hydroxide

• Calcium oxide

• Slaked lime

• Quick lime

Look at the attached image; if the solution in the test tube is H₂SO₄ select the most suitable option

• Reaction will take place in all the test tubes

• Reaction will take place in (i) and (iii)

• Reaction will take place in (ii), (iii) and (iv) when H₂SO₄ in dilute form

• Reaction will take place in (ii), (iii), (iv) as well as (i) if H₂SO₄ in concentrated form

• Reaction will take place in (i), (iii) and (iv)

Which of the following statements is correct with respect to the reaction represented in the image:

• Copper nitrate is obtained as the product which is blue in appearance

• Copper nitrate is obtained as the product which is reddish brown in appearance

• Colorless silver nitrate solution is in the beaker

• Reddish brown metal immersed in the solution is capable of reacting with dilute acids

Copper reacts with hot and concentrated Sulphuric acid

• True

• False

• Sometimes; when copper is used in granular state

Zinc sulphate is also known as

Copper Sulphate is also known as

Which of the following gases is used to store fat and oil-containing foods for a long time?

• Oxygen

• Nitrogen

• Neon

• Carbon dioxide