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Q:

Which one of the following laws explain the formation of carbon monoxide and carbon dioxide from carbon and oxygen

A) Laws of conservation of mass	B) Laws of multiple proportion
C) Laws of reciprocal proportions	D) Law of definite proportions

Answer & Explanation Answer: B) Laws of multiple proportion

Explanation:

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Filed Under: Chemistry

Q:

A sum of money lent at compound interest for 2 years at 20% per annum would fetch Rs.482 more, if the interest was payable half yearly than if it was payable annually . The sum is

A) 10000	B) 20000
C) 40000	D) 50000

Answer & Explanation Answer: B) 20000

Explanation:

Let sum=Rs.x

C.I. when compounded half yearly = $[x {(1 + \frac{10}{100})}^{4} - x] = \frac{4641}{10000}$

C.I. when compounded annually = $[x {(\frac{20}{100})}^{2} - x] = \frac{11}{25}$

$\frac{4641}{10000} x - \frac{11}{25} x = 482$

=> x=20000

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Filed Under: Compound Interest
Exam Prep: Bank Exams
Job Role: Bank PO

Q:

An element X forms an oxide $XO_{_{3}}$ , what ihe valency of X

A) 1	B) 2
C) 3	D) 6

Answer & Explanation Answer: D) 6

Explanation:

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Filed Under: Chemistry

Q:

Which one of the following elements is the poorest conductor of heat

A) sodium	B) lead
C) zinc	D) mercury

Answer & Explanation Answer: B) lead

Explanation:

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Filed Under: Chemistry

Q:

Which one among the following is the heaviest

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

Answer & Explanation Answer: C) 1 mole of sodium atoms

Explanation:

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Filed Under: Chemistry

Q:

How many electrons are there in Na+

A) 1	B) 10
C) 11	D) 12

Answer & Explanation Answer: B) 10

Explanation:

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Filed Under: Chemistry

Q:

Which one of the following substances does not have a melting point

A) bromine	B) sodium chloride
C) mercury	D) glass

Answer & Explanation Answer: D) glass

Explanation:

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Filed Under: Chemistry

Q:

Which one of the following mixture is homogeneous

A) starch and sugar	B) methanol and water
C) graphite and charcoal	D) calcium carbonate and calcium bicarbonate

Answer & Explanation Answer: B) methanol and water

Explanation:

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Filed Under: Chemistry

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