Questions

Q:

The book ' Discovery of India ' is written by

A) Maithilisharan Gupt B) Mahadevi Verma
C) Ramdhari Singh Dinkar D) Surya Kant Tripathi Nirala
 
Answer & Explanation Answer: C) Ramdhari Singh Dinkar

Explanation:
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Q:

What is the oxidation number of carbon in NaHCO3?

A) -4 B) -3
C) +4 D) +2
 
Answer & Explanation Answer: C) +4

Explanation:

The given compound is NaHCO3 Sodium bicarbonate which is commonly known as Baking soda.

Oxidation numbers are the charges on ions. When a neutral atom loses electrons it becomes positively charged. When a neutral atom gains electrons it becomes negatively charged.

 

Here the C represents the oxidation state of carbon in this compound. Compounds are electrically neutral, which is why we set the sum of the oxidation states equal to zero.

Sodium has a +1 oxidation state. Hydrogen has a +1 oxidation state. Oxygen has a -2 oxidation state. There are three oxygen atoms, which means the total oxidation state provided by both oxygen ions is -6. Adding up these oxidation states we get:

1 + 1 + (-6) + C = 0

-4 + C = 0

=> C = 4


This means the oxidation state of carbon in this compound is +4.

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Q:

Which of the following is an endocrine gland?

A) Mammary glands B) Apocrine sweat glands
C) Reproductive glands D) Salivary glands
 
Answer & Explanation Answer: C) Reproductive glands

Explanation:

Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct.

 

The major glands of the endocrine system include:

pineal gland,

pituitary gland,

pancreas,

ovaries,

testes,

thyroid gland,

parathyroid gland,

hypothalamus and

adrenal glands.

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Filed Under: Biology
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Q:

The Ghodazari Wildlife Sanctuary (GWS) will come up in which state?

A) Maharashtra B) Karnataka
C) Tamil Nadu D) Odisha
 
Answer & Explanation Answer: A) Maharashtra

Explanation:

The Maharashtra Government has recently approved Ghodazari Wildlife Sanctuary in Chandrapur district as a new wildlife sanctuary in the state.

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Q:

The first speaker of the Lok Sabha was 

A) GV Mavlankar B) Hukum Singh
C) MA Ayyangar D) GS Dhillon
 
Answer & Explanation Answer: A) GV Mavlankar

Explanation:
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Q:

How many wickets Kapil Dev had taken in test matches when he retired

A) 450 B) 430
C) 435 D) 434
 
Answer & Explanation Answer: D) 434

Explanation:
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Q:

When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is

A) the violet ray B) the red ray
C) the green ray D) the blue ray
 
Answer & Explanation Answer: B) the red ray

Explanation:

Red is deviated the least and violet the most

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Filed Under: Physics

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Q:

Which type of molecule is CF4?

A) nonpolar, with a symmetrical distribution of charge B) polar, with an asymmetrical distribution of charge
C) nonpolar, with an asymmetrical distribution of charge D) polar, with a symmetrical distribution of charge
 
Answer & Explanation Answer: A) nonpolar, with a symmetrical distribution of charge

Explanation:

CF4 is tetrahedral.

Since the four 'F' atoms have the same electronegativity values, there is no bias in electron distribution toward any one.

 

Therefore, electron/charge distribution is symmetrical, which also means that the molecule is nonpolar.

 

Hence, CF4 is nonpolar molecule with a symmetrical distribution of charge.

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