Archives

End product when phenyl magnesium bromide reacts with t-butanol

When Phenyl Magnesium Bromide reacts with t-butanol, benzene is obtained as the product. As for the reaction process, it forms benzene because... View Article

Which of the following reaction is not a redox reaction?(A) Combustion (B) Double displacement (C) Synthesis of two elements (D) Decomposition into elements

The Correct Answer is (B) Double displacement Solution: A double displacement reaction is not a redox reaction. This is because in this... View Article

Covalency of carbon in carbon dioxide is:

(A) 1 (B) 2 (C) 3 (D) 4 The Correct Answer is (D) 4. Solution: The covalency of carbon in carbon dioxide is 4. In carbon dioxide O... View Article

The total number of electrons in 4.2 g of N3−ion is:

(A) 3NA (B) 3.2NA (C) 2.1NA (D) 4.2NA The Correct Answer is (A) 3NA Solution: N3- = 4.2 g = moles = 0.3 moles If one mole of... View Article

Arrange Ag, Cr and Hg metals in the increasing order of reducing power.

Given: (A) Cr > Hg > Ag (B) Hg > Ag > Cr (C) Ag > Cr > Hg (D) Ag > Hg > Cr The Correct Answer is (A) Cr > Hg... View Article

The arrangement of the first two layers, one above the other, in hcp and ccp arrangement is:

(A) Partly same (B) Nothing definite (C) Different from each other (D) Exactly the same in both cases. The Correct Answer is (D) Exactly... View Article

In the following reaction, identify the substance that is oxidized and the substance that is reduced.

Solution: In the above-given reaction : H2 is oxidised since it has lost electrons Cu is reduced since it has gained electrons. An... View Article

Which of the following statement is true about the oxidation process?

(A) Loss of electron (B) Addition of oxygen (C) Addition of hydrogen (D) All of the above The Correct Answer is (D) All of the above.... View Article

The correct order of basicity is:

(A) 1 > 2 > 3 > 4 (B) 4 > 3 > 2 > 1 (C) 1 > 3 > 2 > 4 (D) 2 > 4 > 1 > 3 The Correct Answer is (C) 1 >... View Article

A sample of the hydrogen atoms is excited to the n=4 state. In the spectrum of the emitted radiation, the number of lines in the ultraviolet and visible regions is respectively:

(A) 1:3 (B) 2:1 (C) 2:3 (D) 3:1 The Correct Answer is (B) 2:1. Solution: Balmer series → Visible → n = 2. Lyman series... View Article

Assertion: Corrosion of iron is commonly known as rusting. Reason: Corrosion of iron occurs in the presence of moist air.

(A) Both assertion and reason are false. (B) Assertion is true, but the reason is false. (C) Both assertion and reason are true. The reason is... View Article

Assertion: The order of bond angle of halides of boron is Bi3 > BBr3 > BCl3 > BF3. Reason: Greater is the size of surrounding atom larger will be the bond angle.

(A) Both assertion and reason are false. (B) Assertion is true, but the reason is false. (C) Both assertion and reason are true. The reason is... View Article

The percentage composition of sodium phosphate as determined by analysis is 42.1% sodium, 18.9 % phosphorus and 39 % oxygen. What will be the empirical formula of the compound?

(A) NaPO4 (B) Na2PO4 (C) Na3PO4 (D) Na4PO4 The Correct Answer is (C) Na3PO4 Solution: The empirical formula is to be calculated as:... View Article

Which of the following phenomena occur when a small amount of acid is added to water?

(A) Dilution (B) Ionisation (C) Neutralisation (D) Both (A) and (B). The Correct Answer is (D) Both (A) and (B). Solution: When a small... View Article

When the following aldohexose exists in its d-configuration, then the total number of stereoisomers in its pyranose form is:

(A) 8 (B) 16 (C) 24 (D) 32 The Correct Answer is (A) 8. Solution: The total number of stereoisomers in its pyranose form = 2 * 2 * 2 = 8... View Article

A 5% solution of cane sugar (mol. mass = 342) is isotonic with 1% solution of a substance X. The molecular mass of X is:

(A) 34.5 (B) 68.4 (C) 136.8 (D) 171.2 The Correct Answer is (B) 68.4 Solution: Given: 5% solution of cane sugar = 5g of solute present in... View Article

0.4g of an organic compound gave 0.188g of silver bromide by a halogen estimation method. The percentage of bromine in the compound is:(Atomic mass of Ag = 108, Br= 80)

(A) 20% (B) 39.8% (C) 40.0% (D) 48.0% The Correct Answer is (A) 20% Solution: Percentage of Br = Explore more such questions and... View Article

An aqueous solution of 6.3 g oxalic acid dihydrate is made up to 250 mL. The volume of 0.1 N NaOH required to completely neutralize 10 mL of this solution is :

(A) 4 ml (B) 10 ml (C) 20 ml (D) 40 ml The Correct Answer is (D) 40 ml. Solution: n-factor for H2C2O4.2H2O = 2 Normality = Equating... View Article

An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be?

(A) CHO (B) CH2O (C) CH3O (D) CH4O The Correct Answer is (C) CH3O Solution: The empirical formula is to be calculated as: Element... View Article

In Lassaigne’s test for the detection of halogens, the sodium fusion extract is first boiled with concentrated nitric acid. This is performed :

(A) To dissolve Ag2S (B) To dissolve AgCN (C) To remove silver halides (D) To decompose Na2S and NaCN The Correct Answer is (D) To decompose... View Article

M	T	W	T	F	S	S
	1	2	3	4	5	6
7	8	9	10	11	12	13
14	15	16	17	18	19	20
21	22	23	24	25	26	27
28