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

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 816 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 400.00 or

Question number: 1

» Chemistry » Structure of Atom

Appeared in Year: 2013

MCQ▾

Question

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 number: 2

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 3

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

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 false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true

f Page
Sign In