Chemistry [NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension]: Questions 1 - 3 of 63

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Question 1

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Appeared in Year: 2013

Question

MCQ▾

Which of the following is a suitable example for illustrating the law of conservation of mass? (atomic mass of O = 16, H = 1)

Choices

Choice (4)Response
a.18 g of water freezes at 4°C to give same mass of ice
b.18 g of water is completely converted into vapour state on heating
c.18 g of water in liquid state is obtained by heating 18 g of ice
d.18 g of water is formed by the combination of 16 g oxygen with 2 g of hydrogen

Question 2

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Appeared in Year: 2013

Question

MCQ▾

A silvery white metal X Y Z. Z Y X, Y Z reacts with water at room temperature to produce a water soluble compound and a colorless gas The reactions are highly exothermic and the catches fire immediately during the reaction. The solution of in water on reacting with stoichiometric amount of dilute solution of hydrochloric acid gives a solution of pH = 7.0 the compounds and respectively are

Choices

Choice (4)Response
a.
b.
c.
d.

Question 3

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Appeared in Year: 2013

Question

Assertion-Reason▾

Assertion (Ꭺ)

Reactivity of aluminum decreases when it is dipped in nitric acid.

Reason (Ꭱ)

a protective layer of aluminum nitrate is formed when aluminum is dipped in nitric acid.

Choices

Choice (4)Response
a.Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
b.Ꭺ is false but Ꭱ is true
c.Ꭺ is true but Ꭱ is false
d.Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ