NEET Questions - Chemistry - Some Basic Concepts in Chemistry

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Identify the wrong statement in the following (AIEEE 2008).

CFCs are responsible for ozone layer depletion.
Greenhouse effect is responsible for global warming.
Ozone layer does not permit I.R. radiation from the sun to reach the earth.
Acid rain is mostly because of oxides of ‘N’ and ‘S’

In the reaction $ 2Al_{(s)}+ 6HCl_{(aq)} \rightarrow 2 Al ^{3+}_{(aq)} + 6Cl ^ - _{(aq)} + 3H_{2(g)} $ (AIEEE 2007)

$ 6L HCl_{( aq )} is consumed for every 3L, H_{2(g)}$ produced.
$ 33.6L H_{2_{(g)}} $ is produced regardless of temperature and pressure for every mole ofAl that reacts
$ 67.2 H_{2_{(g)}} $ at STP, is produced for every mole Al that reacts
$ 11.2L H_{2_{(g)}} at STP, is produced for every mole HCl_{( aq )} $ consumed.

Consider a titration of potassium dichromate solution with acidified Mohr’s salt solution using diphenyl amine as indicator. The number of moles of Mohr’s salt required per mole of dichromate is (IIT JEE 2007)

3
4
5
6

Which has maximum number of atoms ? (IIT JEE 2003)

24g of C (12)
56g of Fe(56)
27g of Al (27)
108g of Ag (108)

Number of atoms in 560 g of Fe (atomic mass = 56) is (AIEEE 2002)

twice that of 70 g N.
half that of 20 g H
both (1) and (2)
None of these

In the standardization of $ Na_2S_2O_3 using K_2Cr_2O_7 by iodometry, the equivalent weight of K_2Cr_2O_7 $ is (IIT JEE 2001)

$ { Molar mass \over 2 } $
$ { Molar mass \over 6 } $
$ { Molar mass \over 3 } $
same as molar mass

Mixture X=0.02 mole of $ [Co(NH_3)_5SO_4] Br and 0.02 mole of[Co(NH_3)_5Br]SO_4 was prepared in 2L of Solution 1L of mixture X + excess AgNO_3 \rightarrow Y 1L of mixture X+ excess BaCl_2 \rightarrow Z $ Number of mole of Y and Z are (IIT JEE 2003)

0.01, 0.01
0.02, 0.01
0.02, 0.01
0.02, 0.02

How many moles of electron weight one kilogram ? (IIT JEE 2002)

$ 6.023 \times 10 ^ {23} $
$ { 1 \over 9.108 } \times 10 ^ {31} $
$ { 6.023 \over 9.108} \times 10 ^ {54} $
$ { 1 \over 9.108 \times 6.023 } \times 10 ^ 8 $

A container is filled with 2L of water. What will be the volume of water in m3?

$ 2 \times 10 ^ 3 $
$ 1 \times 10 ^ 3 $
$ 2 \times 10 ^ {-3} $
$ 1 \times 10 ^ {-3} $

The mass of carbon -12 atom considered in the definition of a mole is

0.012Kg
0.12g
120 mg
None of these

The drug which is used for treating AIDS victims is

Azidothymidine
Cis- platin
Taxol
All of these

Chose the incorrect statement .

The constituents of a compound cannot be separated into simpler substances by physical methods
An element is consists of only one type of particles and these particles may be atoms or molecules.
The properties of a compound are same as its constituent elements.
Atoms of different elements are different in nature.

Which of the following is a pair of physical and chemical property respectively of a substance ?

acidity & combustibility
colour & density
basicity & colour
density & acidity.

What is the symbol of S.I. unit for the amount of substance ?

$ N_A $
n
mole
mol

Find the correct relation.

$ ^\circ F = { 9 \over 5 } ( ^\circ C ) -32 $
$ ^\circ C = { 5 \over 9 } ( ^\circ F ) + 32 $
Both 1 & 2
Neither 1 or 2

NEET Chemistry Questions: Some Basic Concepts in Chemistry