CHEM BRAIN

Which of the following do not have tendency to form hydrogen bonding MDCAT2024

H – bonding is maximum in [BHU 2003]

When two ice cubes are pressed over each other, they unit to form one cube. Which of the following force is responsible for holding them together [NCERT 1978] 

Which is the weakest among the following types of bond [NCERT 1979; MADT Bihar 1984] 

Hydrogen bond energy is equal to [UPSEAT 2003] 

The boiling point of a compound is raised by [DPMT 2001] 

Which of the following hydrogen bonds are strongest in vapor phase [AMU 1999]

The high density of water compared to ice is due to [CBSE PMT 1997; BHU 1999; AFMC 2001]

Strength of hydrogen bond is intermediate between [DPMT 1991] 

The hydrogen bond is strongest in [BHU 1987; CBSE PMT 1990, 92] 

Hydrogen bonding is maximum in [IIT 1987; MP PMT 1991; MP PET 1993, 2001; MNR 1995; CPMT 1999; KCET (Med.) 2002] 

The maximum possible number of hydrogen bonds in which an H2O molecule can participate is [MP PMT 1986; MNR 1991; IIT 1992; MP PET 1999]

HCl is a gas but HF is a low boiling liquid. This is because [NCERT 1984; MP PMT 2001] 

The bond that determines the secondary structure of a protein is[NCERT 1984]

Acetic acid exists as dimer in benzene due to [CPMT 1982] 

Which among the following compounds does not show hydrogen bonding [MP PMT 1989]

The pairs of bases in DNA are held together by [NCERT 1978; DPMT 1985; CBSE PMT 1992] 

Of the following hydrides which has the lowest boiling point [CBSE PMT 1987] 

Which contains strongest H - bond [IIT 1986; MP PET 1997, 2003; UPSEAT 2001, 03]

Which concept best explains that o-nitrophenol is more volatile than p-nitrophenol [AIIMS 1980, 82; Kurukshetra CEE 1998; MP PET 2002]

The reason for exceptionally high boiling point of water is [DPMT 1986; NCERT 1976; AMU 1984; EAMCET 1979; MP PMT 1993; AIIMS 1996; KCET 2001; CPMT 2003]

Contrary to other hydrogen halides, hydrogen fluoride is a liquid because [MP PMT 1990; AMU 1983; EAMCET 1980]

In the following which has highest boiling point [MP PMT 1989; RPMT 1997] 

Water is a universal solvent due to NUMS2021

Max density of ice is at NUMS2021

Two ice blocks stick together due to NUMS2021

In which of following compound Hydrogen bonding is possible ETEA2012-166

Hydrogen bonding in HF is stronger than H₂O and NH_{3 .}The highest boiling point among the three is ETEA2018

The reason for exceptionally high boiling point of water is [DPMT 1986; NCERT 1976; AMU 1984; EAMCET 1979; MP PMT 1993; AIIMS 1996; KCET 2001; CPMT 2003]

According to Watson and Crick Model of DNA, the DNA molecule consist of a double helix. What type of forces are responsible to keep two strands of DNA together MDCAT2019   

An intermolecular force of attraction X is relatively stronger than the others intermolecular forces, it stablilizes alpha and beta-plated sheets of proteins. The double helical structure of DNA is also atabilized by this force of attraction. identify X. MDCAT2019

Which one of following Hydrogen Bond is stronger than others? MDCAT2015

DNA molecule is double stranded, in which two chains of DNA are twisted around each other by MDCAT2017

Water has maximum density at NUMS2019

In crystal lattice of ice, each O-atom of water molecule is attached to MDCAT2014

Ice is less dense than water at MDCAT2014

Which of the following substance exhibit hydrogen bonding? MDCAT2019

According to Watson and Crick's model of DNA, the DNA molecule consist of a double helix. What type of forces are responsible to keep two strands of DNA together? MDCAT2019