Which of the following is the most active chemically?
The metal does not give H2 on treatment with dilute HCL is:
Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?
The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group
In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group
Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens
In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group
Alkali metals belong to which group in periodic table?
Which of the following sets of quantum numbers is correct for an electron in 4f orbital?
N= 4, I =3, m = +4, s = +1/2
N= 3, I = 2, m = -2, S = + 1/2
N=4, I = 3, m = +1, s = + 1/2
N=4, I = 4, m -4, s = - 1/2
Which of the five isomeric hexanes, the isomer which can give two monochlorinated compounds?
The number of moles of solute present in 1 kg of a solvent is called its:
The vapour pressure of toluene is 6.811 kPa at 310 K and 24.15 kPa at 340 K. Assuming that the variation of the vapour pressure p with temperature T may be described by the expression What are the values of A and B?
A = 7.059, B = 1930 K
A = 5.307, B = 1930 K
A = 6.971, B = 7780 K
A = 5.307, B = 7780 K
Consider the following statements: Hard water is not suitable for (1) Drinking (2) Washing clothes with soap (3) Use in boilers (4) Irrigating crops Which of these statements are correct?
1 and 3
2 and 3
1, 2 and 4
1, 2, 3 and 4
HBr reacts with CH2 = CH – OCH3 under anhydrous conditions at room temperature to give:
CH3CHO and CH3Br
BrCH2CHO and CH3OH
BrCH2 – CH2 – OCH3
H3C – CHBr – OCH3
What is metallurgy ?
Process of extracting metal in pure form from its ore
Process of creating alloys of metals
Process of making metals live long
None of above
The maximum number of covalent formed by nitrogen is:
If we consider that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will:
Increase two fold
Be a function of the molecular mass of the substance
Which polymer is used in the manufacture of paints and lacquers?
Poly vinyl chloride
A sample of chloroform before using as an anaesthetic, is tested by
Ammonical cuprous chloride
Ammonical silver nitrate solution
Silver nitrate solution after boiling with alcoholic KOH
The substance that contains the maximum amount of nitrogen is ?
The pyrimidine bases present in DNA are:
Cytosine and adenine
Cytosine and guanine
Cytosine and thymine
Cytosine and uracil
What is the chemical name of table salt ?
Which of the following is a polyamide?
Nylon – 66
Which among the following is the most reactive?
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is:
Which of the following statements about diamond are correct? (1) It is used as a gem in jewellery because of its ability to reflect light. (2) It is good conductor of electricity. (3) It is used for cutting glass, marble stones and other hard materials. (4) It is used for drilling of rocks. Select the correct answer using the codes given below :
1, 3 and 4
2, 3 and 4
1, 2 and 3
2 and 4
2,4-D, which is sold as a weed killer of the broad-leaved weeds is a synthetic version of ____________:
None of them
Who is regarded as father of modern chemistry ?
The luster of a metal is due to :
Presence of free electrons
Biogas majorly contains ?
Acid rain is due to air pollution by ?
Nitrous oxide and Sulphur dioxide
Oxides of metals are alkaline.
Until the nineteenth Century, aluminium was almost as expensive as gold. The invention of an inexpensive way to extract this metal by a 22-year-old American made this metal inexpensive subsequently. The inventor was:
α-D-(+)-glucose and β-D-(+)-glucose are
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