PU Entry Test Past Papers

First Law of thermodynamics gives a relationship between

1. heat, work, and energy
2. work, internal energy and enthalpy
3. heat, work, and external energy
4. heat, work, and enthalpy

At which oxidatin state Cu achieves electronic configuration of Zn+2?

1. -1
2. 0
3. +2
4. -3

The substitution of -H by -NO2 group of benzene is called?

1. Ammonolysis
2. Sulphonation
3. Nitration
4. Reaction of benzene

Cement contains Gypsum

1. 3%
2. 2%
3. 4%
4. it contains no gypsum

Basic lead chromate is formed when lead chromate is boiled with:

1. strong alkali hydroxide
2. dilute alkali hydroxide
3. dilute acid
4. strong acid

The carbon-carbon (C-C) bond length in benzene is:

1. 1.34 A
2. 1.20 A
3. 1.54 A
4. 1.39 A

To find the rate of reaction, Dilatometry is a method of ___ nature:

1. chemical
2. theoretical
3. physical
4. special

The height of the peak in the mass spectrum shows:

1. relative abundance
2. mass number
3. number of isotopes
4. number of protons

In bomb calorimeter, reactions are carried out at constant:

1. volume
2. temperature
3. pressure
4. energy

By adding NH4CL to NH4OH solution The ionization of NH4OH.

1. remains same
2. decreases
3. increases
4. increases 100 times