Chemistry [NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension]: Questions 47 - 50 of 63
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Question 47
Appeared in Year: 2013
Question MCQ▾
An element X combines with hydrogen to form a compound . 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
V. reacts with water to form a basic compound.
Choices
Choice (4) | Response | |
---|---|---|
a. | I, II and III | |
b. | III, IV and V | |
c. | V, I and II | |
d. | II, III and IV |
Question 48
Question MCQ▾
Which of the following has the same monomer unit?
Choices
Choice (4) | Response | |
---|---|---|
a. | Rayon and nylon | |
b. | Nylon and cellulose | |
c. | Cellulose and rayon | |
d. | Polyester and nylon |
Question 49
Question MCQ▾
The head of match stick contains
Choices
Choice (4) | Response | |
---|---|---|
a. | white phosphorus only | |
b. | antimony chloride + red phosphorus | |
c. | antimony trisulphide + potassium chlorate | |
d. | antimony trisulphide + potassium chloride |
Question 50
Question MCQ▾
When a base is dissolved in water
Choices
Choice (4) | Response | |
---|---|---|
a. | no change in concentration of OH- ions per unit volume occurs | |
b. | concentration of OH- ions per unit volume increases | |
c. | concentration of OH- ions per unit volume decreases | |
d. | concentration of OH- ions per unit volume may increase or decrease depending upon the nature of the base |