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 Chemistry Questions

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Q:

Alpha particles are ___________.

A) twice the mass of beta particles B) negatively charged
C) just like helium nuclei D) lower in ionizing power as compared to gamma rays
 
Answer & Explanation Answer: C) just like helium nuclei

Explanation:
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Q:

There are two elements-calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as

A) isotones B) isochores
C) isobars D) isotopes
 
Answer & Explanation Answer: C) isobars

Explanation:

Isotopes-These  are  atoms  of  the elements  having  the  same  atomic number but different mass number.,  Isobars-These  are atoms of same mass number but different atomic  number.,  Isotones-These are  atoms  of  different  elements having same number of neutrons.

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Q:

What is the number of groups and periods in the modern periodic table?

A) 18, 7 B) 18, 8
C) 16, 7 D) 16, 8
 
Answer & Explanation Answer: A) 18, 7

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Q:

Which amongst the following is not a Cation?

A) Aluminium ion B) Copper ion
C) Sulphate ion D) Zinc ion
 
Answer & Explanation Answer: C) Sulphate ion

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Q:

What are the main components of Brass Alloy?

A) Copper and Zinc B) Copper and Strontium
C) Copper, Zinc and Nickel D) Copper and Nickel
 
Answer & Explanation Answer: A) Copper and Zinc

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Q:

Which among the following compounds has the strongest hydrogen bond?

A) HI B) HCl
C) HF D) HBr
 
Answer & Explanation Answer: C) HF

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Q:

Which molecule is used up in photosynthesis?

A) Water B) Carbohydrates
C) Oxgen D) Sugar
 
Answer & Explanation Answer: A) Water

Explanation:

The first step in photosynthesis is to split the water molecule using sun light.

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2 1698
Q:

Which one of the following statements regarding histone proteins is correct?

A) Histones are proteins that are present in mitochondrial membrane B) Histones are proteins that are present in nucleus in association with DNA
C) Histones are proteins associated with lipids in the cytosol D) Histones are proteins associated with carbohydrates in the cytosol
 
Answer & Explanation Answer: B) Histones are proteins that are present in nucleus in association with DNA

Explanation:

Histones are highly alkaline proteins found in eukaryotic cell nucleusthat package and order the DNA into structural units called nucleosomes. They are the chief protein components of chromatin, acting as spools around which DNA winds, and playrole in gene regulation.

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