Carbon

Q. Atomic mass of 118 elements without decimals

Q.

How many valence electrons are present in a Sulfur atom?

Q.

A positively-charged particle (alpha-particle) projected towards the west is deflected towards the north by a magnetic field. The direction of the magnetic field is,

1. towards south

2. towards east

3. downward

4. upward

Q.

Give an example of a substitution reaction.

Q.

How many valence electrons does a Carbon atom have?

Q.

Assertion: Ethene polymerized in the presence of Ziegler Natta Catalyst at high temperature and pressure is used to make buckets and dustbins.

Reason: High-density polymers are closely packed and are chemically inert.

Choose the correct answer from the following.

1. Assertion and reason both are wrong.

2. Both assertion and reason are correct and the reason is the correct explanation for assertion.

3. Assertion is correct but reason is wrong.

4. Both assertion and reason are correct but reason is not correct explanation for assertion.

Q. The atomic number of carbon is ______.

1. six
2. four
3. eight
4. twelve

Q.

How many pairs of electrons are shared by the two atoms having (a) single (b) double (c) triple, bond between them?

Q.

The general formula of cyclic alkanes is

1. $C_n{H}_{2n+2}$

2. $C_n{H}_{2n-2}$

3. $C_n{H}_{2n-1}$

4. $C_n{H}_{2n}$

Q.

Explain the structure of white Phosphorus?

Q.

In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called

1. Filaments

2. Hyphae

3. Rhizoids

4. Roots

Q.

The Sodium or potassium salt of a ___ fatty acid is called ___.

Q.

Number of C–H bonds in ethane are ___.

1. 4

2. 2

3. 6

4. 3

Q.

Name an allotrope of carbon which conducts electricity.

Q.

Describe various parts of the circulatory system in human being.

Q. The mass number is defined as the total number of protons and electrons in an atom.

1. True
2. False

Q.

List three of the placentas functions.

Q. Sperms are stored and nourished inside ________.

1. vas deferens
2. uterus
3. epididymis
4. testes

Q. The tiny blob-like structures involved in reproduction of Rhizopus are called __________.

1. hyphae
2. tentacles
3. cysts
4. sporangia

Q. Correctly label the stages of menstrual cycle.

1. A-Ovulation, B-Follicular phase, C- Menstruation, D-Luteal phase
2. A-Menstruation, B-Follicular phase, C-Ovulation, D-Luteal phase
3. A-Follicular phase, B-Luteal phase, C-Ovulation, D-Menstruation
4. A-Ovulation, B-Menstruation, C-Follicular phase, D-Luteal phase

Q. The structural formula of ethyl ethanoate is

1. 
2. 
3. 
4. 

Q.

Name three inorganic compounds containing carbon. Name any three organic compounds.

Q. The valency of carbon is ________.

1. two
2. one
3. four
4. three

Q.

What causes a Placenta to age quickly?

Q.

Fill in the blank with a suitable term:

Tissue culture is also known as _________.

Q. Fill in the blanks:

(f) CO is an ------- compound.(organic /inorganic)

Q.

The number of valence electrons in a magnesium atom is ______________.

Q.

The ___ salt of a long-chain fatty acid is called ___.

Q.

Identify the following substance that is underline: An acid which is present in vinegar.

Q.

What is carboxylic acid?