Chemistry - Comprehensive Mock Test 28

Question 271 Medium

The three methods of science are observation, experimentation and ?

A) Hypothesis B) Measurement C) Deduction D) inference

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Question 272 Medium

Which gas in the atmosphere saves us from the ultra violet rays of the sun?

A) Nitrogen B) Oxygen C) Ozone D) Carbon Monoxide

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Question 273 Medium

With the help of which reaction cyclohexanone is converted into cyclohexane?

A) Wurtz-Fittig reaction B) Wolff-Kishner reduction C) Tischenko reaction D) Stephen’s reaction

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Question 274 Medium

A radioactive substance decays to 3/4 of its original value in 2h. The half?

A) 60 mm B) 30 mm C) 90 mm D) 15 mm

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Question 275 Easy

Which of the following is not a chalcogen?

A) Se B) O C) S D) Na

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Question 276 Medium

Which of the following varies with change in temperature?

A) Mole fraction B) Molality C) % (w/w) D) Formality

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Question 277 Medium

If the vapour denisty of a gas is molecular mass will be?

A) 12 B) 16 C) 18 D) 28

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Question 278 Easy

pH value of neutral solution is?

A) 8 B) 5 C) 7 D) 13

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Question 279 Easy

The ratio of y for inert gases is?

A) 1.33 B) 1.66 C) 2.13 D) 99

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Question 280 Medium

The maximum number of hydrogen bonds is a H2O molecule is?

A) 1 B) 2 C) 3 D) 4

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