Chemistry - Section 1 (3)

Directions to Solve

Chemistry - Section 1

17.

The number of electrons presents in H+ is

A.	zero
B.	one
C.	two
D.	three

Answer: Option A

Explanation:

H+ is a hydrogen ion, and it is an ion because it LOST an electron. Electrons are negatively charged. When an atom gains electrons it will have NEGATIVE charges.

So it has zero electron.

18.

The organic reaction represented by equation CH₃ - CH = O + H₂NOH gives CH₃ - CH - NH + H₂O is an example of

A.	an addition reaction
B.	a condensation reaction
C.	an oxidation reaction
D.	an elimination reaction

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

19.

The most important ore of aluminium is

A.	bauxite
B.	magnetite
C.	haematite
D.	monazite

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

20.

The hardest form of carbon is

A.	coke
B.	graphite
C.	diamond
D.	charcoal

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

21.

The maximum number of isomers for an alkene with molecular formula C₄H₈ is

A.	5
B.	4
C.	2
D.	3

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

22.

The main active constituent of tea and coffee is

A.	nicotine
B.	chlorophyll
C.	caffeine
D.	aspirin

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

23.

The most extensive, commercially useful source of thorium as monazite sand occurs in India at

A.	Orissa coast
B.	Travancore coast
C.	West Bengal coast
D.	Gujarat coast

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

24.

The number of g-molecule of oxygen in 6.02 x 10²⁴CO molecules is

A.	1 gram of molecule
B.	0.5 gram of molecule
C.	5 gram of molecule
D.	10 gram of molecule

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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