Chemistry (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 11 - 13 of 63

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 828 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: 11

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

The reaction between carbon and oxygen can be represented as

C(s)+O2(g)>CO2(g)+Heat

In which of the following type (s), the above reaction can be classified?

I. Combustion reaction

II. Displacement reaction

III. Endothermic reaction

IV. Combination reaction

Choices

Choice (4) Response

a.

Only I

b.

I, III and IV

c.

I and II

d.

I and IV

Question number: 12

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

MCQ▾

Question

An element X combines with hydrogen to form a compound XH3 . The element X is placed on the right side of the periodic table. What is true about the element X?

I. Has valence electrons.

II. Is a metal and is solid.

III. Is a non-mental and is a gas.

IV. Has a 5 valence electrons E. XH3 reacts with water to form a basic compound.

Choices

Choice (4) Response

a.

I, II and III

b.

V, I and II

c.

III, IV and V

d.

II, III and IV

Question number: 13

» Chemistry » Structure of Atom

Appeared in Year: 2013

MCQ▾

Question

An element X (atomic number 12) reacts with another element Y (atomic number 17) to form a compound Z. Which of the following statements is true regarding this compound?

I. Molecular formula of Z is XY2 .

II. It is soluble in water.

III. X and Y are joined by sharing of electrons.

IV. It would conduct electricity in the molten, state.

Choices

Choice (4) Response

a.

II and III

b.

I, III and IV

c.

I and III

d.

II and IV

Sign In