Chemistry - Mock Test 38

Question 371

The hard Shell of an egg was dissolved in HCL. The egg was then placed in a concentration solution of NaCl. What will happens ______?

A) The egg will become harder B) The egg will swell C) The egg will shrink D) There will be hardly any visible change

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Question 372

Temporary hardness is due to the presence of?

A) magnesium sulphate B) calcium bicarbonate C) Calcium carbonate D) calcium sulphate

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Question 373

Brass gets discoloured in air because of the presence of which of the following gases in air?

A) Nitrogen B) Hydrogen sulphide C) Oxygen D) Carbon dioxide

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Question 374

The bleeding of a wound is stopped by the application of ferric chloride because_____?

A) Ferric chloride seals the blood vessels B) Blood starts flowing in the opposite direction C) Blood reacts and a solid is formed which seals the blood vessels D) Blood is coagulated and the blood vessels are sealed

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Question 375

The difference between a nuclear reactor and atomic bomb is that ___________?

A) no chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction B) the chain reaction in nuclear reactor is controlled C) the chain reaction in nuclear reactor is not controlled D) no-chain reaction takes place in atomic bomb while it takes place in nuclear reactor

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Question 376

Which one among the following is the heaviest?

A) 1 mole of sodium atoms B) 1 mole of water molecules C) 1 mole of ammonia molecules D) 1 mole of hydrogen molecules

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Question 377

In nuclear reactor,Chain reaction is controlled by introducing?

A) platinum rod B) cadmium rod C) iron rod D) graphite rod

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Question 378

The nitrogen atom has 7 protons and 7 electrons,The nitride ion will have?

A) 4 protons and 7 electrons B) 7 protons and 10 electrons C) 10 protons and 7 electrons D) 4 protons and 10 electrons

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Question 379

The metal which reacts most violently with with cold water is?

A) magnesium B) potassium C) calcium D) sodium

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Question 380

Name the Scientist who stated that matter can be converted into energy?

A) Avogadro B) Einstein C) Lavoisier D) Boyle

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